AU555342B2 - Creation of Inventions and Patents with Artificial Intelligence

AU555342B2 – Ceramic bandpass filter
– Google Patents

AU555342B2 – Ceramic bandpass filter
– Google Patents
Ceramic bandpass filter

Info

Publication number
AU555342B2

AU555342B2
AU12244/83A
AU1224483A
AU555342B2
AU 555342 B2
AU555342 B2
AU 555342B2
AU 12244/83 A
AU12244/83 A
AU 12244/83A
AU 1224483 A
AU1224483 A
AU 1224483A
AU 555342 B2
AU555342 B2
AU 555342B2
Authority
AU
Australia
Prior art keywords
dielectric
electrode
comprised
conductive material
filter according
Prior art date
1982-02-16
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Application number
AU12244/83A
Other versions

AU1224483A
(en

Inventor
Charles Choi
Raymond L. Sokola
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Motorola Solutions Inc

Original Assignee
Motorola Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1982-02-16
Filing date
1983-01-21
Publication date
1986-09-18

1983-01-21
Application filed by Motorola Inc
filed
Critical
Motorola Inc

1983-08-25
Publication of AU1224483A
publication
Critical
patent/AU1224483A/en

1986-09-18
Application granted
granted
Critical

1986-09-18
Publication of AU555342B2
publication
Critical
patent/AU555342B2/en

2003-01-21
Anticipated expiration
legal-status
Critical

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

H—ELECTRICITY

H01—ELECTRIC ELEMENTS

H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE

H01P1/00—Auxiliary devices

H01P1/20—Frequency-selective devices, e.g. filters

H01P1/201—Filters for transverse electromagnetic waves

H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities

H01P1/2056—Comb filters or interdigital filters with metallised resonator holes in a dielectric block

H—ELECTRICITY

H01—ELECTRIC ELEMENTS

H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE

H01P7/00—Resonators of the waveguide type

H01P7/04—Coaxial resonators

Description

CERAMIC BANDPASS FILTER
Background of the Invention
The present invention is related generally to radio frequency (RF) signal filters, and more particularly to an improved ceramic bandpass filter that is particularly well adapted for use in radio transmitting and receiving circuitry.
Conventional multi-resonator filters include a plurality of resonators that are typically foreshortened short-circuited quarter-wavelength coaxial or helical transmission lines. The resonators are arranged in a conductive enclosure and may be inductively coupled one to another by apertures in their common walls. Each resonator can be tuned by means of a tuning screw which inserts into a hole extending, through the middle of the resonator. Once tuned, the overall response of the filter is determined by the size of the interstage coupling apertures. Since the tuning of the filter can be disturbed by a slight adjustment of the tuning screw, a locknut is required to keep the tuning screw properly positioned at all times. The use of tuning screws not only renders these filters susceptible to becoming de¬ tuned, but also creates additional problems including mechanical locking of the tuning screw and arcing between the tuning screw and the resonator structure. Futher- more, such filters tend to be rather bulky and therefore

are relatively unattractive for applications where size is an important factor.
Summary of the Invention
Accordingly, it is an object of the present in¬ vention to provide an improved ceramic bandpass filter that is smaller and has fewer parts than prior art filters.
It is another object of the present invention to provide an improved low-loss ceramic bandpass filter that exhibits superior temperature stability. It is yet another object of the present invention to provide an improved ceramic bandpass filter that can be automatically tuned.
It is a further object of the present invention to provide an improved ceramic bandpass filter that is comprised of a single piece of selectively plated dielectric material.
Briefly described, the ceramic bandpass filter of the present invention is comprised of a dielectric block having one or more holes extending from its top surface to its bottom surface and further having first and second electrodes each disposed on the dielectric block at a predetermined distance from a corresponding hole. If there is only one hole in the dielectric block, the first and second electrodes may be arranged around that hole. If there are two or more holes in the dielectric block, the first electrode may be located near the hole at one end of the dielectric block and the second electrode may be located near the hole at the opposite end of the dielectric block. The dielectric block is also covered or plated entirely with a conductive material with the exception of portions near one end of each hole and near the first and second electrodes.

Brief Description of the Drawings
Figure 1 is a perspective view of a ceramic bandpass filter embodying the present invention.
Figure 2 is a cross section of the ceramic bandpass filter in Figure 1 taken along lines 2-2. Figure 3 is a cross section of another embodiment of the ceramic bandpass filter in Figure 1 taken along lines 2-2.
Figure 4 is a cross section of a further embodiment of the ceramic bandpass filter in Figure 1 taken along lines 2-2.
Figure 5 is another embodiment of the ceramic bandpass filter of the present invention.
Figure 6 is an equivalent circuit diagram for the ceramic bandpass filter in Figure 1. Figure 7 illustrates an input signal coupling arrangement suitable for use in the ceramic bandpass filter of the present invention.
Figure 8 illustrates another input signal coupling arrangement suitable for use in the ceramic bandpass filter of the present invention.
Figure 9 illustrates yet another input signal coupling arrangement suitable for use in the ceramic bandpass filter of the present invention.
Figure 10 illustrates one arrangement for cascading two ceramic bandpass filters of the present invention. Figure 11 illustrates another arrangement for cascading two ceramic bandpass filters of the present invention.
Figure 12 illustrates yet another embodiment of the ceramic bandpass filter of the present invention.

Detailed Description of the Preferred Embodiments
In Figure 1 , there is illustrated a ceramic bandpass filter 100 embodying the present invention. Filter 100 includes a block 130 which is comprised of a dielectric material that is selectively plated with a conductive material. Filter 100 can be constructed of any suitable dielectric material that has low loss, a high dielectric constant and a low temperature coefficient of the dielectric constant. In a preferred embodiment, filter 100 is comprised of a ceramic compound including barium oxide, titanium oxide and zirconium oxide, the electrical characteristics of which are described in more detail in an article by G. H. Jonker and . Kwestroo, entitled “The Ternary Systems BaO-Ti02-Sn02 and BaO-TiO2~Zr02” , published in the Journal of the American Ceramic Society, volume 41, number 10, at pages 390-394. Of the ceramic compounds described in this article, the compound in Table VI having the composition 18.5 mole % BaO, 77.0 mole % Ti02 and 4.5 mole % Zr02 and having a dielectric constant of 40 is well suited for use in the ceramic filter of the present invention.
Referring to Figure 1, block 130 of filter 100 is covered or plated with an electrically conductive material, such as copper or silver, with the exception of areas 140. Block 130 includes six holes 101-106, which each extend from the top surface to the bottom surface thereof. Holes 101-106 are likewise plated with an electrically conductive material. Each of the plated holes 101-106 is essentially a foreshortened coaxial resonator comprised of a short-circuited coaxial transmission line having a length selected for desired filter response characteristics. Block 130 in Figure 1 also includes input and output electrodes 124 and 125 and corresponding input and output connectors 120 and 122. Although block 130 is shown with
OMPI

six plated holes 101-106, any number of plated holes can be utilized depending on the filter response characteristics desired. For example, an embodiment of the ceramic bandpass filter of the present invention may include only one plated hole, an input electrode and an output electrode, as illustrated by filter 500 in Figure 5. In addition, RF signals can be coupled to filter 500 by means of coaxial cables 520 and 522 in Figure 5 instead of’ connectors 120 and 122 in Figure 1. The plating of holes 101-106 in filter 100 in
Figure 1 is illustrated more clearly by the cross section in Figure 2 which is taken along lines 2-2 in Figure 1. Referring to Figure 2, conductive plating 204 on dielectric material 202 extends through hole 201 to the top surface with the exception of a circular portion 240 around hole 201. Other conductive plating arrangements can be utilized, two of which are illustrated in Figures 3 and 4. In Figure 3, conductive plating 304 on dielectric material 302 extends through hole 301 to the bottom surface with the exception of circular portion 340. The plating arrangement in Figure 3 is substantially identical to that in Figure 2, the difference being that unplated portion 340 is on the bottom surface instead of on the top surface. In Figure 4, conductive plating 404 on dielectric material 402 extends partially through hole 401 leaving part of hole 401 unplated. The plating arrangement in Figure 4 can also be reversed as in Figure 3 so that the unplated portion 440 is on the bottom surface. Coupling between the coaxial resonators provided by plated holes 101-106 in Figure 1 is accomplished through the dielectric material and is varied by varying the width of the dielectric material and the distance between adjacent coaxial resonators. The width of the dielectric material between adjacent holes 101-106 can be adjusted in any suitable regular or irregular manner, such as, for example, by the use of slots, cylindrical holes, square

or rectangular holes, or irregular shaped holes. According to another feature of the present invention, filter 100 in Figure 1 includes slots 110-114 for adjusting the coupling between coaxial resonators provided by holes 101-106. The amount of coupling is varied by varying the depth of the slots 110-114. Although slots 110-1 4 are shown on the side surfaces of filter 100 in Figure 1, slots may also be disposed on the top and bottom surfaces as illustrated in Figure 12. Futhermore, slots 110— 14 can be disposed between adjacent plated holes on one surface, opposite surfaces or all surfaces. Slots 110-114 in Figure 1 can be either plated or unplated depending on the amount of coupling desired. Furthermore, plated or unplated holes located between the coaxial resonators provided by holes 101-106 can also be utilized for adjusting the coupling. Similarly, such holes can be either plated or unplated and varied in size, location and orientation to obtain the desired coupling. In Figure 11, holes 1150 and 1152 are utilized to adjust the coupling of filter 1110, and slots 1160 and 1162 are utilized to adjust the coupling of filter 1112. Holes 1150 and 1152 in filter 1110 in Figure 11 may extend part or all of the way from the top surface to the bottom surface ‘and may also be located on the side surface of filter 1110 instead of its top surface.
RF signals are capacitively coupled to and from filter 100 in Figure 1 and filter 500 in Figure 5 by means of input and output electrodes, 124, 125 and 524, 525, respectively. The resonant frequency of the coaxial resonators provided by plated holes 101-106 in Figure 1 and plated hole 501 in Figure 5 is determined primarily by the depth of the hole, thickness of the dielectric block in the direction of the hole and the amount of plating removed from the top of the filter near the hole. Tuning of filter 100 or 500 is accomplished by the

– 1 – removal of additional ground plating near the top of each plated hole. The removal of qround plating for tuning the filter can easily be automated, and can be accomplished by means of a laser, sandblast trimmer or other suitable trimming devices while monitoring the return loss angle of the filter. This tuning process is implemented by initially grounding the plating at the top of each plated hole 101-106 in Figure 1 and measuring the return loss angle. Then, the ground to each plated hole is removed one at a time, and the ground plating near the top of that plated hole is trimmed until 180 degrees of phase shift is achieved. The grounding of each plated hole 101 to 106 can be done by means of a small plating runner that bridges the unplated area 140 between the plated hole and the surrounding plating on dielectric block
130.
Referring to Figure 6, there is illustrated an equivalent circuit diagram for the ceramic bandpass filter 100 in Figure 1. An input signal from a signal source may be applied via connector 120 to input electrode 124 in Figure 1, which corresponds to the common junction of capacitors 624 and 644 in Figure 6.
Capacitor 644 is the capacitance between electrode 124 and the surrounding ground plating, and capacitor 624 is the capcitance between electrode 124 and the coaxial resonator provided by plated hole 101 in Figure 1. The coaxial resonators provided by plated holes 101-106 in
Figure 1 correspond to shorted transmission lines 601-606 in Figure 6. Capacitors 631-636 in Figure 6 represent the capacitance between the coaxial resonators provided by plated holes 101-106 in Figure 1 and the surrounding ground plating on the top surface. Capacitor 625 represents the capacitance between the resonator provided by plated hole 106 and electrode 125 in Figure 1, and capacitor 645 represents the capacitance between electrode 125 and the surrounding ground plating. An output signal is provided at the junction of capacitors
625 and 645, which corresponds to output electrode 125 in
Figure 1.
ow~ι ~

RF signals can be coupled to the ceramic bandpass filter of the present invention by capacitively coupling plated hole 101 or 106 by way of electrodes 124 or 125 in Figure T, or by the capacitive and inductive coupling arrangements shown in Figures 7, 8 and 9. In Figure 7, electrode 702 surrounded by unplated area 740 is disposed on the side of the dielectric block opposite to the coaxial resonator provided by plated hole 701. An RF signal from coaxial cable 710 is applied to electrode 702 and capacitively coupled to the coaxial resonator provided by plated hole 701. In Figure 8, a strip electrode 802 surrounded by unplated area 840 inductively couples an RF signal from coaxial cable 810 to the coaxial resonator provided by plated hole 801. The center conductor from coaxial cable 810 is attached to the tip of strip electrode 802 and the grounded shield of coaxial cable 810 is connected to the ground plating at the opposite end of strip electrode 802. In Figure 9, the center conductor of coaxial cable 910 is connected to the ground plating above unplated area 940 and opposite the coaxial resonator provided by plated hole 901, and the grounded shield of coaxial cable 910 is connected to the ground plating below unshielded area 940 and also opposite the coaxial resonator provided by plated hole 901. Depending on the requirements of each application of the ceramic bandpass filter of the present invention, RF signals can be coupled to and from the inventive coaxial bandpass filter in any of the ways illustrated in Figures 1, 5, 7, 8 and 9. Moreover, if coupling of RF signals to the inventive ceramic bandpass filter is accomplished by means of electrodes as illustrated in Figures 1 and 5, the electrode can be oriented as illustrated in Figures 1 and 5 or can be located at any suitable position on the perifery of the corresponding plated hole. For example, an electrode can extend out to the end of the dielectric block as do electrodes 124 and 125 in Figure 1, or to the side of the dielectric block as do electrodes 1014, 1016, 1018 and 1020 in Figure 10.

According to another feature of the present invention, two or more of the inventive ceramic bandpass filters can be cascaded to provide more selectivity, or can be intercoupled to provide a multi-band response characteristic. Two different cascade arrangements of the inventive ceramic bandpass filter are illustrated in Figs 10 and 11. In Fig. 10, filters 1010 and 1012 are arranged side by side. An input signal is coupled from coaxial cable 1002 to input electrode 1014 on filter 1010. Output electrode 1016 from filter 1010 is coupled’ to input electrode 1018 on filter 1012 by means of a short jumper wire. An output signal from output electrode 1020 on filter .1012 is connected to coaxial cable 1004. For ease of interconnection, electrodes 1016 and 1018 extend out to the sides of filters 1010 and 1012 instead to the end of the filter as do electrodes 124 and 125 in Fig. 1.
Referring to Fig. 11, filters 1110 and 1112 are. arranged one on top of the other. An input signal from coaxial cable 1102 is connected to input electrode 1114 on filter 1010. Hole 1140 of filter 1010 is plated as illustrated in Fig. 3, such that the circular unplated portion around plated hole 1140 is on the bottom surface of filter 1010. Therefore, the output of filter 1010 can be capacitively coupled therefrom by means of output electrode 1116 in the same manner as illustrated and describe with respect to Fig. 7 hereinabove. The same type of capcitive coupling is provided by input electrode 1118 and output electrode 1120 in filter 1112. Accordingly, the output from filter 1110 is coupled from output electrode 1116 to input electrode 1118 of filter 1112 by means of a jumper wire. The output from filter 1112 provided at output electrode 1120 may be coupled to coaxial cable 1104. According to yet another feature of the present invention, the coupling, between the coaxial resonators provided by plated holes 1140-1142 in filter 1110 can be
CMPI $ λVIPO

adjusted by means of additional holes 1150 and 1152, which are located between adjacent plated holes
1140-1142. The size, location, orienation and plating of additional holes 1150 and 1152 can be varied for varying the amount of coupling between adjacent coaxial resonators. For example, additional holes 1150 and 1152 can be parallel or perpendicular to plated holes 1140, 1141 and 1142. In filter 1112, the coupling has been adjusted by means of slots 160 and 1162 located on the top and bottom surfaces between adjacent coaxial resonators. Furthermore, slots could also be provided on the side surfaces of filter 1112, such that slots are provided on all surfaces between adjacent resonators.
In Fig. 12 there is illustrated another embodiment of the ceramic bandpass filter of the present invention that includes six plated holes 1230-1236 arranged in two rows. The coaxial resonator provided by each plated hole in filter 1210 is coupled to two adjacent coaxial resonators, instead of one as illustrated by the filter in Fig. 1. Coupling from any one of the coaxial resonators to the two adjacent resonators can be individually adjusted by means of slots 1222, 1223 and 1224 provided therebetween. An input signal may be coupled by coaxial cable 1202 to input electrode 1214, and an output signal can be coupled to electrode 1220 by means of coaxial cable 1204. If the portion of slot 1224 between plated holes 1230 and 1235 and between plated holes 1231 and 1234 is deeper than slots 1222 and 1223, the input signal from coaxial cable 1202 may be coupled between plated holes 1230, 1231 and 1232, then across to plated hole 1233 and between plated holes 1233, 1234 and 1235 to coaxial cable 1204. A zig zag coupling path could be provided by making the slots between plated holes 1230 and 1231 and between plated holes 1234 and 1233 deeper and placing output electrode 1220 near hole 1233 instead of hole 1235. Also, input electrode 1214

and output electrode 1220 can be disposed on the end surface so that filter 1210 can be stood on end to conserve space.
According to yet a further of the present invention, couplding also occurs between plated holes 1230 and 1235 and between plated holes 1231 and 1234 in Figure 12, and provides transmission zeros in the response characteristic of filter 1210. These transmission zeros make the skirt attenuation of filter 1210 steeper. As can be ascertained from filter 1210 in Figure 12, the number and configuration of plated holes utilized in the ceramic bandpass filter of the present invention can be varied to achieve the response characteristics required for a particular application. Referring to Fig. 13, there is illustrated a multi- band filter comprised of two intercoupled ceramic bandpass filters 1304 and 1312 of the present invention. Two or- more of the inventive ceramic bandpass filters can be intercoupled to provide apparatus that combines and/or frequency sorts two RF signals into and/or from a composite RF signal. For example, one application of this feature of the present invention is the arrangment in Fig. 13 which couples a transmit signal from an RF transmitter 1302 to an antenna 1308 and a receive signal from antenna 1308 to an RF receiver 1314. The arrangement in Fig. 13 can be advantageously utilized in mobile, portable and fixed station radios as an antenna duplexer. The’ transmit signal from RF transmitter 1302 is coupled to filter 1304 and thereafter by transmission line 1306 to antenna 1308. Filter 1304 is a ceramic bandpass filter of the present invention, such as the filter illustrated in Figs. 1, 5, 10, 11 and 12. The passband of filter 1304 is centered about the frequency of the transmit signal from RF transmitter 1302, while at the same time greatly attenuating the frequency of the receive signal. In addition, the length of transmission line 1306 is selected to maximize its impedance at the frequency of the receive signal.

– 12 – A receive signal from antenna 1308 in Fig. 13 is coupled by transmission line 1310 to filter 1312 and thereafter to RF receiver 1314. Filter 1312 which also may be one of the inventive ceramic bandpass filters
5 illustrated in Figs. 1, 5, 10, 1 and 12 has a passband centered about the frequency of the receive signal, while at the same time greatly attenuating the transmit signal. Similarly, the length of transmission line 1310 is selected to maximize its impedance at the transmit signal
10 frequency for further attenuating the transmit signal. In the embodiment of the RF signal duplexing apparatus in Fig. 13, transmit signals having a frequency range from 825 mHz to 845 mHz and receive signals having a frequency range from 870 mHz to 890 mHz were coupled to
15 the antenna of a mobile radio. The ceramic bandpass filters 1304 and 1312 were of the type shown in Fig.. 1. The filters 1304 and 1312 each had a length of 77.6 mm., a height of 11.54 mm. and a width of 11.74 mm. Filter 1304 had an insertion loss of 1.6db and attenuated
20 receive signals by at least 55db. Filter 1312 had an insertion loss of 1.6db and attenuated receive signals by at least 55db.
In summary, an improved ceramic bandpass filter has been described that is more reliable and smaller than
25 prior art filters. The construction of the ceramic band¬ pass filter of the present invention not only is simple but also amenable to automatic fabricating and adjusting techniques. The inventive ceramic bandpass filter can be cascaded with one or more other ceramic bandpass filters
30 for providing greater selectivity, and can be intercoupled with one or more other ceramic bandpass filters to provide apparatus that combines and/or frequency sorts two or more RF signals into/from a composite RF signal. This feature of the present
35 invention can be advantageously utilized for providing an antenna duplexer where a transmit signal is coupled to an antenna and a receive signal is coupled from the antenna.

Claims (44)

Claims

1. A bandpass filter comprising: means comprised of a dielectric material having top and bottom surfaces, said dielectric means further having at least two holes extending from the top surface to the bottom surface thereof and spatially disposed at a predetermined distance from one another; first electrode means comprised of a conductive material disposed on the dielectric means at a predetermined distance from one of the holes in the dielectric means; second electrode means comprised of a conductive material disposed on the dielectric means at a predetermined distance from a hole other than said one of the holes in the dielectric means; and said dielectric means further being entirely covered with a conductive material with the exception of portions near one end of each hole and near the first and second electrode means.

2. The bandpass filter according to claim 1 , wherein the dielectric means is comprised of a block of dielectric material having the shape of a cylinder.

3. The bandpass filter according to claim 1, wherein the dielectric means is comprised of a block of a dielectric material having the shape of parallelepiped.

4. The bandpass filter according to claim 1 , further including at least one slot in the dielectric ‘ means between each hole for adjusting the electrical signal coupling from the first electrode means to the second electrode means.

5. The bandpass filter according to claim 4, wherein said slots are covered with a conductive material.

6. The bandpass filter according to claim 4, wherein said dielectric means has two end surfaces and two side surfaces, and said slots are disposed on at least one of the top, bottom and side surfaces.

7. The bandpass filter according to claim 6, wherein said sslloottss aarree ddisposed on at least two opposite surfaces.

8. The bandpass filter according to claim 1, further including between said holes at least one additional hole for adjusting the electrical signal coupling from the first electrode means to the second electrode means.

9. The bandpass filter according to claim 1 , 2 or

3, further including a signal source for generating an input signal with respect to signal ground, the input signal being coupled to one of the first and second electrode means, and the conductive material being coupled to signal ground. j :.h . 10. A bandpass filter comprising: means comprised of a dielectric material having parallel, flat, top and bottom surfaces, said dielectric means further having at least two holes extending from the top surface to the bottom surface thereof and spatially disposed at a predetermined distance from one another; first electrode means comprised of a conductive material plated on the top surface of the dielectric means at a predetermined distance from one of the holes in the dielectric means; second electrode means comprised of a conductive material plated on the top surface of the dielectric means at a predetermined distance from a hole other than said one of the holes in the dielectric means; and said dielectric means further being plated entirely with a conductive material with the exception of portions near one end of each hole and near the first and second electrode means.

OMPI . wherein the dielectric means is comprised of a block of dielectric material having the shape of a cylinder.

12. The bandpass filter according to claim 10, wherein the dielectric means is comprised of a block of a dielectric material having the shape of parallelepiped.

13. The bandpass filter according to claim 10, further including at least one slot in the dielectric means between each hole for adjusting the electrical signal coupling from the first electrode means to the second electrode means.

14. The bandpass filter according to claim 13, wherein said slots are plated with a conductive material.

15- The bandpass filter according to claim 11, wherein said dielectric means has two end surfaces and two side surfaces, and said slots are disposed on at least one of the top, bottom and side surfaces.

16. The bandpass filter according to claim 13, wherein said slots are disposed on at least two opposite surfaces.

17. The bandpass filter according to claim 10, further including between said holes at least one additional hole for adjusting the electrical signal coupling from the first electrode means to the second electrode means.

18. The bandpass filter according to claim 10, 11 or 12, further including a signal source for generating an input signal with respect to signal ground, the input signal being coupled to one of the first and second electrode means, and the conductive material being coupled to signal ground.
C PI

19 A bandpass filter comprising: means comprised of a dielectric material having top and bottom surfaces, said dielectric means further including a hole extending from the top surface to the bottom surface thereof; first electrode means comprised of a conductive material disposed on the dielectric means at a predetermined distance from the hole in the dielectric means; second electrode means comprised of a conductive material disposed on the dielectric means at a predetermined distance from the hole in the dielectric means; and said dielectric means further being covered entirely with a conductive material with the exception of portions near one end of the hole and near the first and second electrode means.

20. The bandpass filter according to claim 19, wherein the dielectric means is comprised of a block of dielectric material having the shape of a cylinder.

21. The bandpass filter according to claim 19, wherein the dielectric means is comprised of a block of a dielectric material having the shape of parallelepiped.

22. The bandpass filter according to claim 19, 20 or 21 further including a signal source for generating an input signal with respect to signal ground, the input signal being coupled to one of the first and second
‘5 electrode means, and the conductive material being coupled to signal ground.

23. A bandpass filter comprising: means comprised of a dielectric material having parallel, flat, top and bottom surfaces, said dielectric means further including a hole extending from the top surface to the bottom surface thereof; first electrode means comprised of a conductive material plated on the top surface of the dielectric means at a predetermined distance from the hole in the dielectric means; second electrode means comprised of a conductive material plated on the top surface of the dielectric means at a predetermined distance from the hole in the dielectric means; and said dielectric means further being plated entirely with a conductive material with the exception of portions near one end of the hole and near the first and second electrode means.,
OϊvfFI

24. The bandpass; filter according to claim 23, wherein the dielectric means is comprised of a block of dielectric material having the shape of a cylinder.

25. The bandpass filter according to claim 23, wherein the dielectric means is comprised of a block of a dielectric material having the shape of parallelepiped.
.

26. The bandpass filter according to claim 23, 24 or 25, further including a signal source for generating an input signal with respect to signal ground, the input signal being coupled to one of the first and second electrode means, and the conductive material being coupled to signal ground.

27- A bandpass filter comprising: means comprised of a dielectric material having a top surface, a bottom surface and first and second side surfaces, said dielectric means further having at least two holes extending from the top surface to the bottom surface thereof and spatially disposed at a predetermined distance from one another; first electrode means comprised of a conductive material disposed on one of the first and second side surfaces of the dielectric means at a predetermined distance from the top surface and substantially opposite one of the holes in the dielectric means;
. second electrode means comprised of a conductive material disposed on one of the first and second side surfaces of the dielectric means at a predetermined distance from the top surface and substantially opposite a hole other than said one of the holes in the dielectric means; and said dielectric means further being entirely covered with a conductive material with the exception of portions near one end of the hole and near the first and second electrode means.

28. A bandpass filter comprising: means comprised of a dielectric material having top and bottom surfaces, said dielectric means further having at least three holes extending from the top surface to the bottom surface thereof and spatially disposed at a predetermined distance from one another, each of said holes having a predetermined amount of electrical coupling to each other hole; first electrode means comprised of a conductive material disposed on the dielectric means at a predetermined distance from one of the holes in the dielectric means; second electrode means comprised of a conductive material disposed on the dielectric means at a predetermined distance from a hole other than said one of the holes in the dielectric means; and said dielectric means further being entirely covered with a conductive material with the exception of portions near one end of each hole and near the first and second electrode means.

29. A multi-band filter comprising:
(a) first bandpass filtering means comprising:
(i) means comprised of a dielectric material having top and bottom surfaces, said dielectric means further having at least two holes extending from the top surface to the bottom surface thereof and spatially disposed at a predetermined distance from one another;
(ii) first electrode means comprised of a conductive material disposed on the dielectric means at a predetermined distance from one of the holes in the dielectric means;
(iii) second electrode means comprised of a conductive material disposed on the dielectric means at a predetermined distance from a hole other than said one of the holes in the dielectric means; and
(iv) said dielectric means further being covered entirely with a conductive material with the exception of portions near one end of each hole and near the first and second electrode means; and
(b) second bandpass filtering means comprising: (i) means comprised of a dielectric material having top and bottom surfaces, said dielectric means further having at least two holes extending from the top surface to the bottom surface thereof and spatially disposed at a predetermined distance from one another;
(ii) first electrode means comprised of a conductive material disposed on the dielectric means at a predetermined distance from one of the holes in the dielectric means; (iϋ) second electrode means comprised of a conductive material disposed on the dielectric means at a predetermined distance from a hole other than said one of the holes in the dielectric means; and (iv) said dielectric means further being covered entirely with a conductive material with the exception of portions near one end of each hole and near the first and second electrode means; and
(c) means for coupling the first electrode means of the first bandpass filtering means to the first electrode means of the second bandpass filtering means.
O PI

30. The multi-band filter according to claim 29, further including radio frequency (RF) transmitting means for generating a transmit signal, RF receiving means adapted to receive a receive signal, and means for radiating an RF signal; the transmit signal being coupled to the second electrode means of the first bandpass filtering means, the recieve signal being coupled to the second electrode means of the second bandpass filtering means, and the radiating means being coupled to the first electrode means of the first bandpass filtering means and the first electrode means of the second bandpass filtering means.

31. The multi-band filter according to claim 30, further including first transmission line means interposed between the first electrode means of the first bandpass filtering means and the radiating means, said first transmission line means having a length such that its impedance is a maximum at the frequency of the recieve signal; and further including second transmission line means interposed between the first electrode means of the second bandpass filtering means and the radiating means, said second transmission line means having a length such that its impedance is a maximum at the frequency of the transmit signal.

32. The multi-band filter according to claim 29, further including first radio frequency (RF) transmitting means for generating a first transmit signal, second RF transmitting means for generating a second transmit signal, and means for radiating an RF signal; the first transmit signal being coupled to the second electrode means of the first bandpass filtering means, the second transmit signal being coupled to the second electrode means of the second bandpass filtering means, and the radiating means being coupled to the first electrode means of_the first bandpass filtering means and’ the first electrode means of the second bandpass filtering means.

33. The multi-band filter according to claim 32, further including first transmission line means interposed between the first electrode means of the first bandpass filtering means and the radiating means, said first transmission line means having a length such that its impedance is a maximum at the frequency of the recieve signal; and further including second transmission line means interposed between the first electrode means of the second bandpass filtering means and the’ radiating means, said second transmission line means having a length such that its impedance is a maximum at the frequency of the transmit signal.

34. The multi-band filter according to claim 29, further including first radio frequency (RF) receiving means adapted to receive a first receive signal, second RF receiving means adapted to receive a second receive signal, and means for radiating an RF signal; the first receive signal being coupled to the second electrode means of the first bandpass filtering means, the second receive signal being coupled to the second electrode means of the second bandpass filtering means, and the radiating means being coupled to the first electrode means of the first bandpass filtering means and the first electrode means of the second bandpass filtering means.

35. The multi-band filter according to claim 34, further including first transmission line means interposed between the first electrode means of the first bandpass filtering means and the radiating means, said first transmission line means having a length such that its impedance is a maximum at the frequency of the recieve signal; and further including second transmission line means interposed between the first electrode means of the second bandpass filtering means and the radiating means, said second transmission line means having a length such that its impedance is a maximum at the frequency of the transmit signal.

36. A bandpass filter comprising: means comprised of a dielectric material having top and bottom surfaces, said dielectric means further having at least two holes extending from the top surface to the bottom surface thereof and spatially disposed at a predetermined distance from one another; first electrode means comprised of a conductive material disposed at a predetermined distance from one of the holes in the dielectric means; second electrode means comprised of a conductive material disposed at a predetermined distance from a hole other than said one of the holes in the dielectric means; and said dielectric means further being entirely covered with a conductive material with the exception of portions near one end of each hole.
– –

37. The bandpass filter according to claim 36, wherein the dielectric means is comprised of a block of dielectric material having the shape of a cylinder.

38. The bandpass filter according to claim 36, wherein the dielectric means is comprised of a block of a dielectric material having the shape of parallelpiped.

39. The bandpass filter according to claim 36, further including at least one slot in the dielectric means between each hole for adjusting the electrical signal coupling from the first electrode means to the second electrode means.

40. The bandpass filter according to claim 39, wherein said slots are covered with a conductive material.

41. The bandpass filter according to claim 39, wherein said dielectric means has two end surfaces and two side surfaces, and said slots are disposed on at least one of the top, bottom and side surfaces.

42. The bandpass filter according to claim 41, wherein said slots are disposed on at least two opposite surfaces.

43. The bandpass filter according to claim 36, fur¬ ther including between said holes at least one additional hole for adjusting the electrical signal coupling from the first electrode means to the second electrode means.

44. The bandpass filter according to claim 36, further including a signal source for generating an input signal with respect to signal ground, the input signal being coupled to one of the first and second electrode means, and the conductive material being coupled to signal ground.

AU12244/83A
1982-02-16
1983-01-21
Ceramic bandpass filter

Expired

AU555342B2
(en)

Applications Claiming Priority (2)

Application Number
Priority Date
Filing Date
Title

US06/349,346

US4431977A
(en)

1982-02-16
1982-02-16
Ceramic bandpass filter

US349346

1994-12-02

Publications (2)

Publication Number
Publication Date

AU1224483A

AU1224483A
(en)

1983-08-25

AU555342B2
true

AU555342B2
(en)

1986-09-18

Family
ID=23371997
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

AU12244/83A
Expired

AU555342B2
(en)

1982-02-16
1983-01-21
Ceramic bandpass filter

Country Status (15)

Country
Link

US
(1)

US4431977A
(en)

EP
(1)

EP0100350B1
(en)

JP
(1)

JPH0728165B2
(en)

KR
(1)

KR900008764B1
(en)

AR
(1)

AR229727A1
(en)

AU
(1)

AU555342B2
(en)

CA
(1)

CA1186756A
(en)

DE
(1)

DE3377253D1
(en)

DK
(1)

DK163617C
(en)

ES
(1)

ES8402996A1
(en)

FI
(1)

FI78797C
(en)

IL
(1)

IL67711A
(en)

MX
(1)

MX151970A
(en)

SG
(1)

SG73090G
(en)

WO
(1)

WO1983002853A1
(en)

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

AU570899B2
(en)

1984-09-27
1988-03-24
Nec Corporation
Bandpass filter with dielectric resonators

Families Citing this family (194)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4546334A
(en)

1982-04-24
1985-10-08
Murata Manufacturing Co., Ltd.
Electrical filter device

EP0093956B1
(en)

1982-05-10
1989-09-06
Oki Electric Industry Company, Limited
A dielectric filter

JPS58194402A
(en)

1982-05-10
1983-11-12
Oki Electric Ind Co Ltd
Dielectric filter

US4607242A
(en)

1983-05-02
1986-08-19
Rockwell International Corporation
Microwave filter

US4523162A
(en)

1983-08-15
1985-06-11
At&T Bell Laboratories
Microwave circuit device and method for fabrication

JPS60114004A
(en)

1983-11-25
1985-06-20
Murata Mfg Co Ltd
Dielectric coaxial resonator

JPS6152003A
(en)

1984-08-21
1986-03-14
Murata Mfg Co Ltd
Dielectric filter

GB2165098B
(en)

1984-09-27
1988-05-25
Motorola Inc
Radio frequency filters

US4742562A
(en)

1984-09-27
1988-05-03
Motorola, Inc.
Single-block dual-passband ceramic filter useable with a transceiver

US4768003A
(en)

1984-09-28
1988-08-30
Oki Electric Industry Co., Inc.
Microwave filter

JPS61208902A
(en)

1985-03-13
1986-09-17
Murata Mfg Co Ltd
Mic type dielectric filter

JPH0246082Y2
(en)

1985-04-04
1990-12-05

US4740765A
(en)

1985-09-30
1988-04-26
Murata Manufacturing Co., Ltd.
Dielectric filter

JPH055681Y2
(en)

1985-10-18
1993-02-15

KR920001453B1
(en)

1986-05-12
1992-02-14
오끼뎅끼 고오교오 가부시끼가이샤
Dielectric filter

US4692726A
(en)

1986-07-25
1987-09-08
Motorola, Inc.
Multiple resonator dielectric filter

DE3751062T2
(en)

1986-07-25
1996-01-18
Motorola Inc

FILTERS CONSISTING OF A BUILT-IN UNIT WITH SEVERAL RESONATORS.

US4716391A
(en)

1986-07-25
1987-12-29
Motorola, Inc.
Multiple resonator component-mountable filter

US4954796A
(en)

1986-07-25
1990-09-04
Motorola, Inc.
Multiple resonator dielectric filter

JPS6342201A
(en)

1986-08-07
1988-02-23
Alps Electric Co Ltd
Microwave branching filter

US4800347A
(en)

1986-09-04
1989-01-24
Murata Manufacturing Co., Ltd.
Dielectric filter

JPS6381503U
(en)

1986-11-17
1988-05-28

US4691179A
(en)

1986-12-04
1987-09-01
Motorola, Inc.
Filled resonant cavity filtering apparatus

US4721932A
(en)

1987-02-25
1988-01-26
Rockwell International Corporation
Ceramic TEM resonator bandpass filters with varactor tuning

US4757288A
(en)

1987-02-25
1988-07-12
Rockwell International Corporation
Ceramic TEM bandstop filters

US4745379A
(en)

1987-02-25
1988-05-17
Rockwell International Corp.
Launcher-less and lumped capacitor-less ceramic comb-line filters

US5023866A
(en)

1987-02-27
1991-06-11
Motorola, Inc.
Duplexer filter having harmonic rejection to control flyback

US4800348A
(en)

1987-08-03
1989-01-24
Motorola, Inc.
Adjustable electronic filter and method of tuning same

JPH0612841B2
(en)

1987-08-08
1994-02-16
沖電気工業株式会社

Frequency adjustment method for dielectric filter

JPH01112801A
(en)

1987-10-26
1989-05-01
Kokusai Electric Co Ltd
Dielectric band-pass filter

JPH0652842B2
(en)

1987-12-28
1994-07-06
沖電気工業株式会社

Polarized dielectric filter

JPH01175301A
(en)

1987-12-28
1989-07-11
Tdk Corp
Dielectric filter

US4837534A
(en)

1988-01-29
1989-06-06
Motorola, Inc.
Ceramic block filter with bidirectional tuning

US4879533A
(en)

1988-04-01
1989-11-07
Motorola, Inc.
Surface mount filter with integral transmission line connection

US4823098A
(en)

1988-06-14
1989-04-18
Motorola, Inc.
Monolithic ceramic filter with bandstop function

GB2224397B
(en)

1988-09-28
1993-01-13
Murata Manufacturing Co
Dielectric resonator and filter

JPH07105644B2
(en)

1988-10-18
1995-11-13
沖電気工業株式会社

Polarized dielectric filter

US4896124A
(en)

1988-10-31
1990-01-23
Motorola, Inc.
Ceramic filter having integral phase shifting network

JPH0644681B2
(en)

1988-11-21
1994-06-08
国際電気株式会社

Band stop filter

US5103197A
(en)

1989-06-09
1992-04-07
Lk-Products Oy
Ceramic band-pass filter

US5307036A
(en)

1989-06-09
1994-04-26
Lk-Products Oy
Ceramic band-stop filter

JPH0338101A
(en)

1989-07-04
1991-02-19
Murata Mfg Co Ltd
High frequency coaxial resonator

GB2235339B
(en)

1989-08-15
1994-02-09
Racal Mesl Ltd
Microwave resonators and microwave filters incorporating microwave resonators

GB2236432B
(en)

1989-09-30
1994-06-29
Kyocera Corp
Dielectric filter

US5023580A
(en)

1989-12-22
1991-06-11
Motorola, Inc.
Surface-mount filter

JP2793685B2
(en)

1990-03-20
1998-09-03
富士通株式会社

Derivative filter

US5177902A
(en)

1990-08-08
1993-01-12
Oki Electric Industry Co., Ltd.
Ultrasonic grinder system for ceramic filter and trimming method therefor

US5065120A
(en)

1990-09-21
1991-11-12
Motorola, Inc.
Frequency agile, dielectrically loaded resonator filter

US5055808A
(en)

1990-09-21
1991-10-08
Motorola, Inc.
Bandwidth agile, dielectrically loaded resonator filter

DE4193230C1
(en)

1990-12-20
1997-10-30
Motorola Inc

Transmission circuit in a radio telephone with a level transmitter

US5157365A
(en)

1991-02-13
1992-10-20
Motorola, Inc.
Combined block-substrate filter

US5147835A
(en)

1991-03-05
1992-09-15
Motorola, Inc.
Composite titanate aluminate dielectric material

US5327108A
(en)

1991-03-12
1994-07-05
Motorola, Inc.
Surface mountable interdigital block filter having zero(s) in transfer function

US5130683A
(en)

1991-04-01
1992-07-14
Motorola, Inc.
Half wave resonator dielectric filter construction having self-shielding top and bottom surfaces

FI86673C
(en)

1991-04-12
1992-09-25
Lk Products Oy

CERAMIC DUPLEXFILTER.

US5130682A
(en)

1991-04-15
1992-07-14
Motorola, Inc.
Dielectric filter and mounting bracket assembly

US5230093A
(en)

1991-05-03
1993-07-20
Rich Randall W
Transmitter filter with integral directional coupler for cellular telephones

FI90158C
(en)

1991-06-25
1993-12-27
Lk Products Oy

OEVERTONSFREKVENSFILTER AVSETT FOER ETT KERAMISKT FILTER

FI88440C
(en)

1991-06-25
1993-05-10
Lk Products Oy

Ceramic filter

FI88442C
(en)

1991-06-25
1993-05-10
Lk Products Oy

Method for offset of the characteristic curve of a resonated or in the frequency plane and a resonator structure

FI88443C
(en)

1991-06-25
1993-05-10
Lk Products Oy

The structure of a ceramic filter

US5191305A
(en)

1991-07-02
1993-03-02
Interstate Electronics Corporation
Multiple bandpass filter

GB9114970D0
(en)

1991-07-11
1991-08-28
Filtronics Components
Microwave filter

JP2910807B2
(en)

1991-10-25
1999-06-23
株式会社村田製作所

Dielectric resonator device, dielectric filter, and method of manufacturing the same

DE4140299A1
(en)

1991-10-26
1993-07-08
Aeg Mobile Communication
Comb-line filter with two capacitors in series – which constitute voltage divider between stripline resonator end and second earth plane for input and output

JPH06504028A
(en)

1991-10-31
1994-05-12
シーティーエス・コーポレーション

Improved manufacturing method for dielectric block filters

US5198788A
(en)

1991-11-01
1993-03-30
Motorola, Inc.
Laser tuning of ceramic bandpass filter

US5208566A
(en)

1992-01-21
1993-05-04
Motorola, Inc.
Dielectric filter having adjacently-positioned resonators of dissimilar cross-sectional dimensions and notched side surface

US5488335A
(en)

1992-01-21
1996-01-30
Motorola, Inc.
Multi-passband dielectric filter construction having a filter portion including at least a pair of dissimilarly-sized resonators

DE69321152T2
(en)

1992-01-22
1999-05-06
Murata Manufacturing Co

Dielectric resonator and method for adjusting its characteristics

JP3293200B2
(en)

1992-04-03
2002-06-17
株式会社村田製作所

Dielectric resonator

US5896074A
(en)

1992-01-22
1999-04-20
Murata Manufacturing Co., Ltd.
Dielectric filter

US5208568A
(en)

1992-02-03
1993-05-04
Motorola, Inc.
Method for producing dielectric resonator apparatus having metallized mesa

JP2571296Y2
(en)

1992-06-10
1998-05-18
株式会社村田製作所

Dielectric resonator

JP2568720Y2
(en)

1992-07-22
1998-04-15
株式会社村田製作所

Dielectric coaxial resonator

US5404120A
(en)

1992-09-21
1995-04-04
Motorola, Inc.
Dielectric filter construction having resonators of trapezoidal cross-sections

US5379011A
(en)

1992-10-23
1995-01-03
Motorola, Inc.
Surface mount ceramic filter duplexer having reduced input/output coupling and adjustable high-side transmission zeroes

US5329687A
(en)

1992-10-30
1994-07-19
Teledyne Industries, Inc.
Method of forming a filter with integrally formed resonators

JPH0758506A
(en)

1993-08-09
1995-03-03
Oki Electric Ind Co Ltd
Lc type dielectric filter and antenna multicoupler using it

EP0641035B1
(en)

1993-08-24
2000-11-15
Matsushita Electric Industrial Co., Ltd.
A laminated antenna duplexer and a dielectric filter

JPH0725602U
(en)

1993-09-28
1995-05-12
日本特殊陶業株式会社

Dielectric filter mounting structure

JP3448341B2
(en)

1994-04-11
2003-09-22
日本特殊陶業株式会社

Dielectric filter device

KR0147726B1
(en)

†

1994-06-16
1998-08-17
무라따 야스따까
Dielectric filter

US5614875A
(en)

1994-07-19
1997-03-25
Dae Ryun Electronics, Inc.
Dual block ceramic resonator filter having common electrode defining coupling/tuning capacitors

US5495215A
(en)

1994-09-20
1996-02-27
Motorola, Inc.
Coaxial resonator filter with variable reactance circuitry for adjusting bandwidth

US5613197A
(en)

1994-11-03
1997-03-18
Hughes Aircraft Co.
Multi-channel transponder with channel amplification at a common lower frequency

US5748058A
(en)

1995-02-03
1998-05-05
Teledyne Industries, Inc.
Cross coupled bandpass filter

US5684439A
(en)

1995-10-10
1997-11-04
Motorola, Inc.
Half wave ceramic filter with open circuit at both ends

DE69629729D1
(en)

1995-11-16
2003-10-02
Ngk Spark Plug Co

Dielectric filter and method for tuning its center frequency

FI960277A
(en)

1996-01-19
1997-07-20
Lk Products Oy

Dielectric resonator structure with harmonic attenuation

US5828275A
(en)

1996-02-20
1998-10-27
Matsushita Electric Industrial Co., Ltd.
Dielectric filter including an adjusted inner electrode and a coupling electrode being level with an open end of a molded member

US5793267A
(en)

1996-03-07
1998-08-11
Murata Manufacturing Co., Ltd.
Dielectric block filter having first and second resonator arrays coupled together

US6083883A
(en)

1996-04-26
2000-07-04
Illinois Superconductor Corporation
Method of forming a dielectric and superconductor resonant structure

US5850168A
(en)

1997-04-18
1998-12-15
Motorola Inc.
Ceramic transverse-electromagnetic-mode filter having a waveguide cavity mode frequency shifting void and method of tuning same

US5880646A
(en)

1997-05-07
1999-03-09
Motorola, Inc.
Compact balun network of doubled-back sections

US5861853A
(en)

1997-05-07
1999-01-19
Motorola, Inc.
Current balanced balun network with selectable port impedances

KR100249838B1
(en)

1997-10-07
2000-03-15
이계철
High frequency filter with u-type resonator

US6118072A
(en)

1997-12-03
2000-09-12
Teledyne Technologies Incorp.
Device having a flexible circuit disposed within a conductive tube and method of making same

US5959511A
(en)

1998-04-02
1999-09-28
Cts Corporation
Ceramic filter with recessed shield

JP3470613B2
(en)

1998-09-28
2003-11-25
株式会社村田製作所

Dielectric filter device, duplexer and communication device

FI113576B
(en)

1999-05-19
2004-05-14
Adc Solitra Oy

Filter

JP3521839B2
(en)

1999-05-27
2004-04-26
株式会社村田製作所

Dielectric filter, dielectric duplexer and communication device

US6313721B1
(en)

1999-08-06
2001-11-06
Ube Electronics, Ltd.
High performance dielectric ceramic filter using a non-linear array of holes

FI20001384A
(en)

2000-06-09
2001-12-10
Nokia Networks Oy

Trimming embedded structures

KR100369211B1
(en)

2000-06-19
2003-01-24
한국과학기술연구원
Monoblock dielectric duplexer

US6686817B2
(en)

2000-12-12
2004-02-03
Paratek Microwave, Inc.
Electronic tunable filters with dielectric varactors

US6650202B2
(en)

2001-11-03
2003-11-18
Cts Corporation
Ceramic RF filter having improved third harmonic response

US7042314B2
(en)

2001-11-14
2006-05-09
Radio Frequency Systems
Dielectric mono-block triple-mode microwave delay filter

US7068127B2
(en)

2001-11-14
2006-06-27
Radio Frequency Systems
Tunable triple-mode mono-block filter assembly

US7095796B1
(en)

2002-01-07
2006-08-22
Vixs, Inc.
Low power radio transmitter using pulse transmissions

US6879222B2
(en)

2002-02-14
2005-04-12
Cts Corporation
Reduced length metallized ceramic duplexer

US20040174236A1
(en)

2002-02-21
2004-09-09
Matthews Brian Richard
Ceramic RF filter having improved third harmonic response

US6894584B2
(en)

2002-08-12
2005-05-17
Isco International, Inc.
Thin film resonators

US6954122B2
(en)

2003-12-16
2005-10-11
Radio Frequency Systems, Inc.
Hybrid triple-mode ceramic/metallic coaxial filter assembly

EP1544940A1
(en)

2003-12-19
2005-06-22
Alcatel
Tower mounted amplifier filter and manufacturing method thereof

US7052288B1
(en)

2004-11-12
2006-05-30
Fci Americas Technology, Inc.
Two piece mid-plane

US7545240B2
(en)

2005-05-24
2009-06-09
Cts Corporation
Filter with multiple shunt zeros

CN100550510C
(en)

2005-06-23
2009-10-14
宇部兴产株式会社
The dielectric filter that is used for base station communication equipment

FI20055420A0
(en)

2005-07-25
2005-07-25
Lk Products Oy

Adjustable multi-band antenna

FI119009B
(en)

2005-10-03
2008-06-13
Pulse Finland Oy

Multiple-band antenna

FI118782B
(en)

2005-10-14
2008-03-14
Pulse Finland Oy

Adjustable antenna

US7724109B2
(en)

2005-11-17
2010-05-25
Cts Corporation
Ball grid array filter

GB0610580D0
(en)

2006-05-30
2006-07-05
Ceravision Ltd
Lamp

WO2007142786A1
(en)

2006-05-31
2007-12-13
Cts Corporation
Ceramic monoblock filter with inductive direct-coupling and quadruplet cross-coupling

US8618990B2
(en)

2011-04-13
2013-12-31
Pulse Finland Oy
Wideband antenna and methods

EP2084776A1
(en)

2006-10-27
2009-08-05
CTS Corporation
Monoblock rf resonator/filter

US7940148B2
(en)

2006-11-02
2011-05-10
Cts Corporation
Ball grid array resonator

WO2008063507A2
(en)

2006-11-17
2008-05-29
Cts Corporation
Voltage controlled oscillator module with ball grid array resonator

FI20075269A0
(en)

2007-04-19
2007-04-19
Pulse Finland Oy

Method and arrangement for antenna matching

US7656236B2
(en)

2007-05-15
2010-02-02
Teledyne Wireless, Llc
Noise canceling technique for frequency synthesizer

US8208266B2
(en)

2007-05-29
2012-06-26
Avx Corporation
Shaped integrated passives

US7898367B2
(en)

2007-06-15
2011-03-01
Cts Corporation
Ceramic monoblock filter with metallization pattern providing increased power load handling

FI120427B
(en)

2007-08-30
2009-10-15
Pulse Finland Oy

Adjustable multiband antenna

US9136570B2
(en)

2007-12-07
2015-09-15
K & L Microwave, Inc.
High Q surface mount technology cavity filter

US20090236134A1
(en)

2008-03-20
2009-09-24
Knecht Thomas A
Low frequency ball grid array resonator

US8179045B2
(en)

2008-04-22
2012-05-15
Teledyne Wireless, Llc
Slow wave structure having offset projections comprised of a metal-dielectric composite stack

US7847658B2
(en)

2008-06-04
2010-12-07
Alcatel-Lucent Usa Inc.
Light-weight low-thermal-expansion polymer foam for radiofrequency filtering applications

EP2144326A1
(en)

2008-07-07
2010-01-13
Nokia Siemens Networks OY
Filter for electronic signals and method for manufacturing it

FI20096134A0
(en)

2009-11-03
2009-11-03
Pulse Finland Oy

Adjustable antenna

FI20096251A0
(en)

2009-11-27
2009-11-27
Pulse Finland Oy

MIMO antenna

US8847833B2
(en)

2009-12-29
2014-09-30
Pulse Finland Oy
Loop resonator apparatus and methods for enhanced field control

FI20105158A
(en)

2010-02-18
2011-08-19
Pulse Finland Oy

SHELL RADIATOR ANTENNA

US9406998B2
(en)

2010-04-21
2016-08-02
Pulse Finland Oy
Distributed multiband antenna and methods

US8823470B2
(en)

2010-05-17
2014-09-02
Cts Corporation
Dielectric waveguide filter with structure and method for adjusting bandwidth

EP2588645B1
(en)

2010-06-30
2018-05-30
RDM Family Investments LLC
Method for depositing a nickel-metal layer

FI20115072A0
(en)

2011-01-25
2011-01-25
Pulse Finland Oy

Multi-resonance antenna, antenna module and radio unit

US9673507B2
(en)

2011-02-11
2017-06-06
Pulse Finland Oy
Chassis-excited antenna apparatus and methods

US8648752B2
(en)

2011-02-11
2014-02-11
Pulse Finland Oy
Chassis-excited antenna apparatus and methods

US9130255B2
(en)

2011-05-09
2015-09-08
Cts Corporation
Dielectric waveguide filter with direct coupling and alternative cross-coupling

US9030278B2
(en)

2011-05-09
2015-05-12
Cts Corporation
Tuned dielectric waveguide filter and method of tuning the same

US9130256B2
(en)

2011-05-09
2015-09-08
Cts Corporation
Dielectric waveguide filter with direct coupling and alternative cross-coupling

US9030279B2
(en)

2011-05-09
2015-05-12
Cts Corporation
Dielectric waveguide filter with direct coupling and alternative cross-coupling

US8866689B2
(en)

2011-07-07
2014-10-21
Pulse Finland Oy
Multi-band antenna and methods for long term evolution wireless system

US9450291B2
(en)

2011-07-25
2016-09-20
Pulse Finland Oy
Multiband slot loop antenna apparatus and methods

US9123990B2
(en)

2011-10-07
2015-09-01
Pulse Finland Oy
Multi-feed antenna apparatus and methods

US9666921B2
(en)

2011-12-03
2017-05-30
Cts Corporation
Dielectric waveguide filter with cross-coupling RF signal transmission structure

US10116028B2
(en)

2011-12-03
2018-10-30
Cts Corporation
RF dielectric waveguide duplexer filter module

US9130258B2
(en)

2013-09-23
2015-09-08
Cts Corporation
Dielectric waveguide filter with direct coupling and alternative cross-coupling

US9466864B2
(en)

2014-04-10
2016-10-11
Cts Corporation
RF duplexer filter module with waveguide filter assembly

US9583805B2
(en)

2011-12-03
2017-02-28
Cts Corporation
RF filter assembly with mounting pins

US10050321B2
(en)

2011-12-03
2018-08-14
Cts Corporation
Dielectric waveguide filter with direct coupling and alternative cross-coupling

US9531058B2
(en)

2011-12-20
2016-12-27
Pulse Finland Oy
Loosely-coupled radio antenna apparatus and methods

US9484619B2
(en)

2011-12-21
2016-11-01
Pulse Finland Oy
Switchable diversity antenna apparatus and methods

US8988296B2
(en)

2012-04-04
2015-03-24
Pulse Finland Oy
Compact polarized antenna and methods

US9979078B2
(en)

2012-10-25
2018-05-22
Pulse Finland Oy
Modular cell antenna apparatus and methods

US10069209B2
(en)

2012-11-06
2018-09-04
Pulse Finland Oy
Capacitively coupled antenna apparatus and methods

CA2892969A1
(en)

2012-11-28
2014-06-05
Alexandre Rogozine
Dielectric waveguide filter with direct coupling and alternative cross-coupling

CN102956938B
(en)

2012-12-12
2015-07-08
张家港保税区灿勤科技有限公司
High-power high-insulativity dielectric duplexer

US9647338B2
(en)

2013-03-11
2017-05-09
Pulse Finland Oy
Coupled antenna structure and methods

US10079428B2
(en)

2013-03-11
2018-09-18
Pulse Finland Oy
Coupled antenna structure and methods

US9202660B2
(en)

2013-03-13
2015-12-01
Teledyne Wireless, Llc
Asymmetrical slow wave structures to eliminate backward wave oscillations in wideband traveling wave tubes

KR101454663B1
(en)

2013-03-26
2014-10-27
삼성전자주식회사
Radio frequency resonators, radio frequency coil and magnetic resonance imaging apparatus

US9634383B2
(en)

2013-06-26
2017-04-25
Pulse Finland Oy
Galvanically separated non-interacting antenna sector apparatus and methods

US9680212B2
(en)

2013-11-20
2017-06-13
Pulse Finland Oy
Capacitive grounding methods and apparatus for mobile devices

US9590308B2
(en)

2013-12-03
2017-03-07
Pulse Electronics, Inc.
Reduced surface area antenna apparatus and mobile communications devices incorporating the same

US9350081B2
(en)

2014-01-14
2016-05-24
Pulse Finland Oy
Switchable multi-radiator high band antenna apparatus

GB201412682D0
(en)

2014-07-17
2014-09-03
Radio Design Ltd
Ceramic filter apparatus and method of use thereof

US9948002B2
(en)

2014-08-26
2018-04-17
Pulse Finland Oy
Antenna apparatus with an integrated proximity sensor and methods

US9973228B2
(en)

2014-08-26
2018-05-15
Pulse Finland Oy
Antenna apparatus with an integrated proximity sensor and methods

US9722308B2
(en)

2014-08-28
2017-08-01
Pulse Finland Oy
Low passive intermodulation distributed antenna system for multiple-input multiple-output systems and methods of use

CN104218278A
(en)

2014-09-16
2014-12-17
张家港保税区灿勤科技有限公司
Ceramic dielectric waveguide filter with grooves

US9647306B2
(en)

2015-03-04
2017-05-09
Skyworks Solutions, Inc.
RF filter comprising N coaxial resonators arranged in a specified interdigitation pattern

US11081769B2
(en)

2015-04-09
2021-08-03
Cts Corporation
RF dielectric waveguide duplexer filter module

US10483608B2
(en)

2015-04-09
2019-11-19
Cts Corporation
RF dielectric waveguide duplexer filter module

CN107690727B
(en)

2015-06-17
2020-03-17
Cts公司
Multiband RF monoblock filter

US9906260B2
(en)

2015-07-30
2018-02-27
Pulse Finland Oy
Sensor-based closed loop antenna swapping apparatus and methods

US10333191B2
(en)

2016-09-23
2019-06-25
Cts Corporation
Ceramic block RF filter having a first plurality of through-hole resonators and a second plurality of through-holes for blocking RF signal coupling

US10312563B2
(en)

2016-11-08
2019-06-04
LGS Innovations LLC
Ceramic filter with differential conductivity

CA3053674C
(en)

2017-02-16
2022-11-08
Huawei Technologies Co., Ltd.
Dielectric filter, transceiver device, and base station

CN107248601A
(en)

2017-06-26
2017-10-13
广东国华新材料科技股份有限公司
A kind of wave filter

EP3883050B1
(en)

2018-12-26
2023-08-30
Huawei Technologies Co., Ltd.
Dielectric filter, duplexer, and communication device

CN111384500A
(en)

2018-12-29
2020-07-07
深圳市大富科技股份有限公司
Dielectric filter and communication equipment

US11437691B2
(en)

2019-06-26
2022-09-06
Cts Corporation
Dielectric waveguide filter with trap resonator

CN112563693A
(en)

2019-09-25
2021-03-26
深圳三星通信技术研究有限公司
Dielectric filter

Family Cites Families (28)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US2637782A
(en)

1947-11-28
1953-05-05
Motorola Inc
Resonant cavity filter

US3293644A
(en)

1964-07-13
1966-12-20
Motorola Inc
Wave trap system for duplex operation from a single antenna

GB1131114A
(en)

1966-06-08
1968-10-23
Marconi Co Ltd
Improvements in or relating to microwave filters

US3413577A
(en)

1966-07-28
1968-11-26
Automatic Elect Lab
Absorption wavemeter

CA921692A
(en)

1969-12-11
1973-02-27
F. Rendle David
Microwave devices

US3691487A
(en)

1970-04-24
1972-09-12
Toko Inc
Helical resonator type filter

JPS5038500B1
(en)

1970-11-26
1975-12-10

US3728731A
(en)

1971-07-02
1973-04-17
Motorola Inc
Multi-function antenna coupler

US3811101A
(en)

1973-03-12
1974-05-14
Stanford Research Inst
Electromagnetic resonator with electronic tuning

CH552304A
(en)

1973-07-19
1974-07-31
Patelhold Patentverwertung

FILTER FOR ELECTROMAGNETIC WAVES.

US3938064A
(en)

1973-09-04
1976-02-10
Bell Telephone Laboratories, Incorporated
Devices using low loss dielectric material

US3876963A
(en)

1973-12-03
1975-04-08
Gerald Graham
Frequency filter apparatus and method

US4080601A
(en)

1976-04-01
1978-03-21
Wacom Products, Incorporated
Radio frequency filter network having bandpass and bandreject characteristics

JPS52153359A
(en)

1976-06-14
1977-12-20
Murata Manufacturing Co
Dielectric resonator

US4101854A
(en)

1977-01-28
1978-07-18
The United States Of America As Represented By The Secretary Of The Army
Tunable helical resonator

JPS5826842B2
(en)

1977-07-06
1983-06-06
株式会社村田製作所

interdigital filter

US4179673A
(en)

1977-02-14
1979-12-18
Murata Manufacturing Co., Ltd.
Interdigital filter

JPS5399849A
(en)

1977-02-14
1978-08-31
Murata Manufacturing Co
Interrdigital filter

US4186359A
(en)

1977-08-22
1980-01-29
Tx Rx Systems Inc.
Notch filter network

US4276525A
(en)

1977-12-14
1981-06-30
Murata Manufacturing Co., Ltd.
Coaxial resonator with projecting terminal portion and electrical filter employing a coaxial resonator of that type

US4157517A
(en)

1977-12-19
1979-06-05
Motorola, Inc.
Adjustable transmission line filter and method of constructing same

CA1128152A
(en)

1978-05-13
1982-07-20
Takuro Sato
High frequency filter

JPS5952842B2
(en)

1978-05-29
1984-12-21
沖電気工業株式会社

High frequency “ro” wave device

US4291288A
(en)

1979-12-10
1981-09-22
Hughes Aircraft Company
Folded end-coupled general response filter

EP0038996B1
(en)

1980-04-28
1984-06-27
Oki Electric Industry Company, Limited
A high frequency filter

JPS5717201A
(en)

1980-07-07
1982-01-28
Fujitsu Ltd
Dielectric substance filter

JPS583301A
(en)

1981-06-30
1983-01-10
Fujitsu Ltd
Dielectric substance filter

GB2109641B
(en)

1981-10-02
1985-08-14
Murata Manufacturing Co
Distributed constant type filter

1982

1982-02-16
US
US06/349,346
patent/US4431977A/en
not_active
Expired – Lifetime

1982-08-12
KR
KR8203628A
patent/KR900008764B1/en
active

1983

1983-01-18
IL
IL67711A
patent/IL67711A/en
not_active
IP Right Cessation

1983-01-21
DE
DE8383900767T
patent/DE3377253D1/en
not_active
Expired

1983-01-21
EP
EP83900767A
patent/EP0100350B1/en
not_active
Expired

1983-01-21
WO
PCT/US1983/000092
patent/WO1983002853A1/en
active
IP Right Grant

1983-01-21
AU
AU12244/83A
patent/AU555342B2/en
not_active
Expired

1983-01-21
JP
JP58500777A
patent/JPH0728165B2/en
not_active
Expired – Lifetime

1983-01-27
CA
CA000420336A
patent/CA1186756A/en
not_active
Expired

1983-02-07
MX
MX196180A
patent/MX151970A/en
unknown

1983-02-14
AR
AR292119A
patent/AR229727A1/en
active

1983-02-16
ES
ES519841A
patent/ES8402996A1/en
not_active
Expired

1983-08-30
DK
DK394583A
patent/DK163617C/en
not_active
IP Right Cessation

1983-10-14
FI
FI833746A
patent/FI78797C/en
not_active
IP Right Cessation

1990

1990-09-06
SG
SG730/90A
patent/SG73090G/en
unknown

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

AU570899B2
(en)

1984-09-27
1988-03-24
Nec Corporation
Bandpass filter with dielectric resonators

Also Published As

Publication number
Publication date

JPH0728165B2
(en)

1995-03-29

ES519841A0
(en)

1984-03-01

KR900008764B1
(en)

1990-11-29

FI833746A0
(en)

1983-10-14

ES8402996A1
(en)

1984-03-01

WO1983002853A1
(en)

1983-08-18

EP0100350B1
(en)

1988-06-29

FI78797B
(en)

1989-05-31

SG73090G
(en)

1990-11-23

DK394583A
(en)

1983-08-30

DK163617B
(en)

1992-03-16

EP0100350A1
(en)

1984-02-15

US4431977A
(en)

1984-02-14

DK163617C
(en)

1992-08-17

FI78797C
(en)

1989-09-11

MX151970A
(en)

1985-05-22

FI833746A
(en)

1983-10-14

JPS59500198A
(en)

1984-02-02

IL67711A0
(en)

1983-05-15

AR229727A1
(en)

1983-10-31

AU1224483A
(en)

1983-08-25

DE3377253D1
(en)

1988-08-04

IL67711A
(en)

1985-12-31

DK394583D0
(en)

1983-08-30

EP0100350A4
(en)

1984-06-29

CA1186756A
(en)

1985-05-07

Contact information