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US3673522A
Expired / Lapsed
US
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Microwave balanced external cavity rejection filter
Assignee: Nortel Networks Ltd
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Filing: 1971-04-05
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Granted: 1972-06-27
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Expires: 1991-04-05
Abstract
Abstract In an axially symmetrical waveguide, a balanced external cavity filter comprising a plurality of resonant cavity pairs coupled to the waveguide and disposed on the circumference of the same in a plane orthogonal to its axis, constitutes a novel mode-filter rejecting undesired polarizations in certain waveguide propagation-modes determined by the angular positions of the cavity pairs and their coupling to the waveguide at frequencies at which the cavity pairs are resonant.
Inventors
- 👤 Arvid Ramkrishnarao Bastikar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:41
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/16; H01P1/20; H01P1/207; H01P1/209
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A waveguide filter comprising: an axially symmetrical waveguide; at least three pairs of resonant cavities, diametrically disposed on said waveguide at angles which are integral multiplier of 45* with respect to each other, in a plane orthogonal to the waveguide axis; each one pair of resonant cavities being resonant at substantially the same frequency; and a plurality of irises in the wall of the waveguide for inductively coupling each of said pairs of resonant cavities to the waveguide to reject a plurality of predetermined modes of waveguide propagation.
Claim 2
Dependent Claim
88 words
A waveguide filter comprising: an axially symmetrical waveguide; at least three pairs of resonant cavities, diametrically disposed on said waveguide at angles which are integral multiplier of 45* with respect to each other, in a plane orthogonal to the waveguide axis; each one pair of resonant cavities being resonant at substantially the same frequency; and a plurality of irises in the wall of the waveguide for inductively coupling each of said pairs of resonant cavities to the waveguide to reject a plurality of predetermined modes of waveguide propagation.
Claim 3
Dependent Claim
119 words
A waveguide filter comprising: an axially symmetrical waveguide; first, second and third pairs of resonant cavities, each pair being diametrically disposed on said waveguide in a plane orthogonal to the waveguide axis, the second and the third pairs of resonant cavities being disposed at 45* with respect to the first pair of resonant cavities, one on either side thereof; rectangular irises for inductively coupling said first pair of resonant cavities to the waveguide; circular irises for coupling said second and third pairs of resonant cavities to the waveguide; and said first, second and third pairs of resonant cavities being resonant at substantially the same frequency, whereby a plurality of predetermined modes of waveguide propagation are rejected by said filter.
Claim 4
Dependent Claim
119 words
A waveguide filter comprising: an axially symmetrical waveguide; first, second and third pairs of resonant cavities, each pair being diametrically disposed on said waveguide in a plane orthogonal to the waveguide axis, the second and the third pairs of resonant cavities being disposed at 45* with respect to the first pair of resonant cavities, one on either side thereof; rectangular irises for inductively coupling said first pair of resonant cavities to the waveguide; circular irises for coupling said second and third pairs of resonant cavities to the waveguide; and said first, second and third pairs of resonant cavities being resonant at substantially the same frequency, whereby a plurality of predetermined modes of waveguide propagation are rejected by said filter.
References Cited (Backward Citations)
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |