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US4513264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bandpass filter with plurality of wave-guide cavities
Assignee: Honeywell Ltd Canada
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Filing: 1982-12-13
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Granted: 1985-04-23
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Expires: 2002-12-13
Abstract
Abstract A bandpass filter 8 has a plurality of cascaded wave-guide cavities 11, 12 1N and inter-cavity coupling means 36, 37. One or more of the cavities 12, 1N is rotated relative to an input reference mode 52. The rotation causes quasi-orthogonal coupling structures to be introduced into said cavities 11, 12 1N. The rotation of one or more cavities enables symmetric or asymmetric amplitude and phase responses to be produced as desired. The filter can be used in channel multiplexers for satellite communication systems.
Inventors
- 👤 James B. Dorey
- 👤 Wai-Cheung Tang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:25
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/207; H01P1/208; H01P1/2082
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
A bandpass filter comprising a plurality of cascaded wave-guide cavities with inter-cavity coupling means, said filter having an input reference mode, at least one of said cavities being rotated with respect to said reference mode, thereby causing quasi-orthogonal coupling structures to be introduced into said cavities, each cavity having a length equal to n times the half-guide wave length at a centre frequency of the filter, where n is an integer and corresponds to the third mode index of a TE mode micro-wave to be transmitted.
Claim 2
Dependent Claim
86 words
A bandpass filter comprising a plurality of cascaded wave-guide cavities with inter-cavity coupling means, said filter having an input reference mode, at least one of said cavities being rotated with respect to said reference mode, thereby causing quasi-orthogonal coupling structures to be introduced into said cavities, each cavity having a length equal to n times the half-guide wave length at a centre frequency of the filter, where n is an integer and corresponds to the third mode index of a TE mode micro-wave to be transmitted.
Claim 3
Dependent Claim
14 words
A filter as claimed in claim 1 wherein said filter is a dual-mode filter.
Claim 4
Dependent Claim
18 words
A filter as claimed in claim 2 wherein all cavities of said filter have the same cross-sectional area.
Claim 5
Dependent Claim
14 words
A filter as claimed in claim 3 wherein all of said cavities are cuboid.
Claim 6
Dependent Claim
14 words
A filter as claimed in claim 3 wherein all of said cavities are cylindrical.
Claim 7
Dependent Claim
22 words
A filter as claimed in claim 3 wherein at least one of said cavities is cuboid and the remaining cavities are cylindrical.
Claim 8
Dependent Claim
22 words
A filter as claimed in claim 3 wherein at least one of said cavities is cylindrical and the remaining cavities are cuboid.
Claim 9
Dependent Claim
29 words
A filter as claimed in claim 1 wherein the filter is of the order N, N being an even integer, and the number of cavities is equal to N/2.
Claim 10
Dependent Claim
39 words
A filter as claimed in claim 1 wherein said filter is of the order N, N being an odd integer, and the number of cavities is equal to (N-1)/2 cavities operating in a dual-mode plus one single mode cavity.
Claim 11
Dependent Claim
24 words
A filter as claimed in claim 1 wherein there is an additional cavity having a rectangular cross-section mounted in cascade with the other cavities.
Claim 12
Dependent Claim
25 words
A filter as claimed in claim 2 wherein said cavities resonate at the same frequency, said frequency being the centre frequency of the bandpass filter.
Claim 13
Dependent Claim
20 words
A filter as claimed in claim 2 wherein said cavities resonate at various frequencies to realize a prescribed response shape.
References Cited (Backward Citations)
GB799163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |