Patent US4124830A successfully refreshed from Google Patents.
US4124830A
Expired / Lapsed
US
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Waveguide filter employing dielectric resonators
Assignee: AT&T Inc
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Filing: 1977-09-27
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Granted: 1978-11-07
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Expires: 1997-09-27
Abstract
Abstract A waveguide bandstop filter is described. Two ceramic dielectric disc resonators each having a resonant frequency f 0 and separated by 3/4λgo, where λgo is the wavelength at f 0 , are each disposed in individual apertures in the waveguide wall. The substantial portion of each resonator is exterior to the waveguide cavity and surrounded by a metallic housing which isolates each resonator from each other. The resonators are oriented so that a coupling arrangement exists between the electromagnetic energy propagating through the waveguide and each resonator so that a resonant mode is excited therein at frequency f 0 .
Inventors
- 👤 Chung-Li Ren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:52
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/10; H01P1/00; H01P1/20; H01P1/207; H01P1/209
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
63 words
A waveguide filter comprising a conductively bounded waveguide having a waveguide wall and capable of propagating electromagnetic energy therethrough, an aperture being located in said waveguide wall, a dielectric resonator having a predetermined resonant frequency adaptively mounted in said aperture so that a substantial portion of said resonator is exterior to said waveguide and the remainder of said resonator is within said waveguide.
Claim 2
Dependent Claim
63 words
A waveguide filter comprising a conductively bounded waveguide having a waveguide wall and capable of propagating electromagnetic energy therethrough, an aperture being located in said waveguide wall, a dielectric resonator having a predetermined resonant frequency adaptively mounted in said aperture so that a substantial portion of said resonator is exterior to said waveguide and the remainder of said resonator is within said waveguide.
Claim 3
Dependent Claim
21 words
A waveguide filter in accordance with claim 1 further comprising a housing element surrounding said substantial portion of said dielectric resonator.
Claim 4
Dependent Claim
19 words
A waveguide filter in accordance with claim 2 wherein said dielectric resonator has the shape of a cylindrical disc.
Claim 5
Dependent Claim
14 words
A waveguide filter in accordance with claim 3 wherein said dielectric resonator is ceramic.
Claim 6
Dependent Claim
19 words
A waveguide filter in accordance with claim 4 wherein said ceramic is Ba 2 Ti 9 O 20 .
Claim 7
Dependent Claim
25 words
A waveguide filter in accordance with claim 3 wherein said housing includes a frequency tuning means for tuning the resonant frequency of said dielectric resonator.
Claim 8
Dependent Claim
34 words
A waveguide filter in accordance with claim 6 wherein said filter further comprises a tunable shunt inductive means within said waveguide to compensate for the asymmetry of the band reject response of said resonator.
Claim 9
Dependent Claim
106 words
A waveguide bandstop filter comprising a rectangular waveguide having two broad width and two narrow width planar waveguide walls and capable of propagating electromagnetic energy therethrough, a plurality of apertures being located in said waveguide walls, a plurality of dielectric resonators each having a resonant frequency f 0 , each one of said resonators being adaptively mounted in one of said apertures so that a substantial portion of each one of said resonators is exterior to said waveguide and the remainder of each one of said resonators is within said waveguide, said resonators being separated by 3/4λgo, where λgo is the wavelength at f 0 .
Claim 10
Dependent Claim
106 words
A waveguide bandstop filter comprising a rectangular waveguide having two broad width and two narrow width planar waveguide walls and capable of propagating electromagnetic energy therethrough, a plurality of apertures being located in said waveguide walls, a plurality of dielectric resonators each having a resonant frequency f 0 , each one of said resonators being adaptively mounted in one of said apertures so that a substantial portion of each one of said resonators is exterior to said waveguide and the remainder of each one of said resonators is within said waveguide, said resonators being separated by 3/4λgo, where λgo is the wavelength at f 0 .
Claim 11
Dependent Claim
35 words
A waveguide bandstop filter in accordance with claim 8 further comprising a plurality of housing means, one each of said plurality of housing means surrounding said substantial portion of each one of said dielectric resonators.
Claim 12
Dependent Claim
23 words
A waveguide bandstop filter in accordance with claim 9 wherein each one of said dielectric resonators has the shape of a cylindrical disc.
Claim 13
Dependent Claim
46 words
A waveguide bandstop filter in accordance with claim 10 wherein each of said resonators is disposed along the center line of the broad width walls of said waveguide and the planar surfaces of said disc resonators are parallel to the narrow width walls of said waveguide.
Claim 14
Dependent Claim
17 words
A waveguide bandstop filter in accordance with claim 10 wherein each of said dielectric resonators is ceramic.
Claim 15
Dependent Claim
20 words
A waveguide bandstop filter in accordance with claim 12 wherein said ceramic is Ba 2 Ti 9 O 20 .
Claim 16
Dependent Claim
26 words
A waveguide bandstop filter in accordance with claim 10 further comprising supporting means having a low dielectric constant for supporting said dielectric resonator within said housing.
Claim 17
Dependent Claim
19 words
A waveguide bandstop filter in accordance with claim 14 wherein said supporting means is composed of Styrene-Phenylene-Oxide molding compound.
Claim 18
Dependent Claim
31 words
A waveguide bandstop filter in accordance with claim 10 further comprising frequency tuning means in each of said housing means for tuning the resonant frequency of each of said dielectric resonators.
Claim 19
Dependent Claim
36 words
A waveguide bandstop filter in accordance with claim 16 further comprising a plurality of tunable shunt inductive means within said waveguide to compensate for the asymmetry of the band reject response of each of said resonators.
Claim 20
Dependent Claim
135 words
A waveguide bandpass filter for passing a signal centered at a frequency f 0 and rejecting signals at a frequency ±Δf from f 0 comprising a rectangular waveguide having two broad width and two narrow width planar conductive waveguide walls and capable of propagating electromagnetic energy therethrough, two apertures being located in said waveguide walls, a first dielectric resonator having a resonant frequency f 0 -Δf and a second dielectric resonator having a resonant frequency f 0 +Δf, each one of said resonators being adaptively mounted in one of said apertures so that the substantial part of each one of said resonators is exterior to said waveguide and the remainder of each one of said resonators is within said waveguide, said resonators being separated by λgo/2, where λgo is the wavelength at f 0 .
Claim 21
Dependent Claim
135 words
A waveguide bandpass filter for passing a signal centered at a frequency f 0 and rejecting signals at a frequency ±Δf from f 0 comprising a rectangular waveguide having two broad width and two narrow width planar conductive waveguide walls and capable of propagating electromagnetic energy therethrough, two apertures being located in said waveguide walls, a first dielectric resonator having a resonant frequency f 0 -Δf and a second dielectric resonator having a resonant frequency f 0 +Δf, each one of said resonators being adaptively mounted in one of said apertures so that the substantial part of each one of said resonators is exterior to said waveguide and the remainder of each one of said resonators is within said waveguide, said resonators being separated by λgo/2, where λgo is the wavelength at f 0 .
Claim 22
Dependent Claim
19 words
A waveguide bandpass filter in accordance with claim 18 further comprising housing means surrounding each of said dielectric resonators.
Claim 23
Dependent Claim
58 words
A waveguide bandpass filter in accordance with claim 19 wherein each of said dielectric resonators is a Ba 2 Ti 9 O 20 ceramic material and is disposed along the center line of either broad width wall of said waveguide, the planar surfaces of each of said discs being parallel to the narrow width walls of said waveguide.
Claim 24
Dependent Claim
55 words
A waveguide bandpass filter in accordance with claim 20 further comprising frequency tuning means in each of said housing means for tuning the resonant frequency of each of said dielectric resonators, and two tunable shunt inductive means within said waveguide to compensate for the asymmetry of the band reject response of each of said resonators.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |