US4437073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equalizer cavity with independent amplitude control
Assignee: United States Department of the Air Force
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Filing: 1982-02-09
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Granted: 1984-03-13
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Expires: 2002-02-09
Abstract
Abstract An equalizer cavity apparatus which is directionally coupled to a rectangular waveguide utilizes a circular waveguide with an adjustable RF absorber therein to lower the quality factor, Q, of the equalizer cavity.
Inventors
- 👤 Herbert L. Thal, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:40
CPC Classifications
H; H01; H01P; H01P9/00; H01P9/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
An equalizer cavity apparatus with independent amplitude control comprising in combination: a rectangular waveguide for carrying an electromagnetic energy; an equalizer cavity means mounted on the top surface of said rectangular waveguide, said equalizer cavity means being directionally coupled to said rectangular waveguide to receive a predetermined amount of said electromagnetic energy through an opening between said equalizer cavity means and said rectangular waveguide, and, a circular waveguide means positioned on the top surface of said equalizer cavity means, said equalizer cavity means including an aperture in its top surface to allow said electromagnetic energy therein to enter said circular waveguide means, said circular waveguide means including means for absorbing RF energy and means for positioning said RF absorber means within said circular waveguide means.
Claim 2
Dependent Claim
125 words
An equalizer cavity apparatus with independent amplitude control comprising in combination: a rectangular waveguide for carrying an electromagnetic energy; an equalizer cavity means mounted on the top surface of said rectangular waveguide, said equalizer cavity means being directionally coupled to said rectangular waveguide to receive a predetermined amount of said electromagnetic energy through an opening between said equalizer cavity means and said rectangular waveguide, and, a circular waveguide means positioned on the top surface of said equalizer cavity means, said equalizer cavity means including an aperture in its top surface to allow said electromagnetic energy therein to enter said circular waveguide means, said circular waveguide means including means for absorbing RF energy and means for positioning said RF absorber means within said circular waveguide means.
Claim 3
Dependent Claim
18 words
An equalizer cavity apparatus as described in claim 1 wherein said circular waveguide means is biased beyond cutoff.
Claim 4
Dependent Claim
23 words
An equalizer cavity apparatus as described in claim 1 wherein said aperture is centered in said top wall of said equalizer cavity means.
Claim 5
Dependent Claim
19 words
An equalizer cavity apparatus as described in claim 1 wherein said RF absorber means comprises a dielectric absorber material.
Claim 6
Dependent Claim
15 words
An equalizer cavity apparatus as described in claim 1 wherein said positioning means is adjustable.
Claim 7
Dependent Claim
19 words
An equalizer cavity apparatus as described in claim 2 wherein both orthogonal modes in said electromagnetic energy are reduced.
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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |