US4280113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for microwaves
Assignee: Alps Alpine Co Ltd
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Filing: 1979-12-27
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Granted: 1981-07-21
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Expires: 1999-12-27
Abstract
Abstract In a microwave filter including a plurality of resonator cavities, at least one of the windows between cavities for coupling them is formed near the end portions of the resonance rods in the cavities, and a part of one of the coupling loops for transmitting signals of microwave frequencies is coplanar with the opening thereby to form an attentuation pole capable of abrupt attenuation of any image frequency.
Inventors
- 👤 Mitsuo Sekiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:53
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2053
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
In a filter for signals in the microwave frequencies, comprising a plurality of resonator cavities separated by respective walls therebetween, each said cavity being formed of a housing and a respective resonance rod formed unitarily with said housing, means including windows formed in said walls for coupling said cavities together and coupling loops for transmitting said signals; the improvement comprising the fact that at least one of said windows is formed in proximity to top end portions of the resonance rods and that a portion of one of said coupling loops is substantially coplanar with said window.
Claim 2
Dependent Claim
97 words
In a filter for signals in the microwave frequencies, comprising a plurality of resonator cavities separated by respective walls therebetween, each said cavity being formed of a housing and a respective resonance rod formed unitarily with said housing, means including windows formed in said walls for coupling said cavities together and coupling loops for transmitting said signals; the improvement comprising the fact that at least one of said windows is formed in proximity to top end portions of the resonance rods and that a portion of one of said coupling loops is substantially coplanar with said window.
Claim 3
Dependent Claim
24 words
A filter for microwaves according to claim 1, wherein said housing is formed with holes for locating said coupling loops in the resonance cavities.
Claim 4
Dependent Claim
41 words
A filter for microwaves according to claim 2, wherein IC boards to which said respective coupling loops are fixed are secured to side surfaces of said housing in such a manner that said respective coupling loops project into the corresponding holes.
Claim 5
Dependent Claim
47 words
A filter for microwaves according to claim 3, wherein those portions of said IC boards to which said coupling loops are fixed are formed with conductive portions, and said conductive portions cover up said holes in said housing when said IC boards are fixed to said housing.
Claim 6
Dependent Claim
34 words
A filter for microwaves according to claim 4, wherein one end of each said coupling loop is electrically connected to the corresponding conductive portion and is grounded to said housing through said conductive portion.
Claim 7
Dependent Claim
26 words
A filter for microwaves according to claim 1, wherein an upper portion of said housing has an opening therein to permit adjustments of said coupling loops.
Claim 8
Dependent Claim
20 words
A filter for microwaves according to claim 6, wherein said opening in said housing is covered with a lid member.
References Cited (Backward Citations)
US3538466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |