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US4028651A
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US
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Coupled-cavity microwave filter
Assignee: Raytheon Co
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Filing: 1976-05-06
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Granted: 1977-06-07
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Expires: 1996-05-06
Abstract
Abstract A coupled-cavity microwave filter including a plurality of relatively high Q cylindrical cavity filters, a relatively large non-adjustable iris aperture coupling adjacent ones of the cavities, a relatively smaller secondary tuning aperture located near the edge of the irises separating the cavities, each such secondary tuning aperture containing a tuning screw extending through the wall of the cavity in order to provide adjustment of the coupling between such adjacent cavities without degrading the cavity Q.
Inventors
- 👤 Juri G. Leetmaa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:46
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/207; H01P1/208; H01P1/2082
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
A coupled-cavity microwave filter providing a narrow bandwidth with precisely controlled frequency responses, comprising: a plurality of tandemly disposed, relatively high Q cylindrical cavity filters; and coupling means including a relatively large non-adjustable primary iris aperture for coupling adjacent ones of said cavities, said coupling means also including a relatively smaller secondary tuning aperture disposed adjacent the outer edge of said irises, each of said secondary tuning apertures containing a tuning screw extending through a wall of an associated one of said cylinders for precisely adjusting the coupling between such adjacent cavities without degrading the cavity Q's thereof.
Claim 2
Dependent Claim
98 words
A coupled-cavity microwave filter providing a narrow bandwidth with precisely controlled frequency responses, comprising: a plurality of tandemly disposed, relatively high Q cylindrical cavity filters; and coupling means including a relatively large non-adjustable primary iris aperture for coupling adjacent ones of said cavities, said coupling means also including a relatively smaller secondary tuning aperture disposed adjacent the outer edge of said irises, each of said secondary tuning apertures containing a tuning screw extending through a wall of an associated one of said cylinders for precisely adjusting the coupling between such adjacent cavities without degrading the cavity Q's thereof.
Claim 3
Dependent Claim
33 words
The filter according to claim 1, wherein said primary iris aperture supports a single mode of propagation and coupling means includes a single secondary tuning aperture adjacent the outer edge of said iris.
Claim 4
Dependent Claim
13 words
The filter according to claim 2, wherein said primary iris aperture is circular.
Claim 5
Dependent Claim
39 words
The filter according to claim 2, wherein said primary iris aperture is a slot having a major axis, said secondary tuning aperture being disposed on a line passing through the center of said slot and perpendicular to said axis.
Claim 6
Dependent Claim
41 words
The filter according to claim 1, wherein said primary iris aperture supports a dual mode of propagation and includes a pair of orthogonally crossed primary coupling slots, a secondary tuning aperture being disposed opposite one end of each of said slots.
Claim 7
Dependent Claim
18 words
The filter according to claim 1, wherein said cylindrical cavity filters share a common cylindrical waveguide wall structure.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |