US3825932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide antenna
Assignee: International Standard Electric Corp
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Filing: 1973-05-16
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Granted: 1974-07-23
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Expires: 1993-05-16
Abstract
Abstract This invention relates to a multi-frequency phased array steerable beam waveguide antenna in which the waveguide radiator elements have a cut-off frequency between two operating frequencies of the antenna. At the lower frequency the waveguides are terminated to function as evanescent mode resonators giving a first passband centered on the lower frequency. At the higher frequency the waveguides are propagating and are terminated to give a second passband centered on the higher frequency.
Inventors
- 👤 G Hockham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:27
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/10; H01Q13/18; H01Q13/06; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/34; H01Q5/00; H01Q5/40; H01Q5/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A multiple frequency waveguide antenna comprising: a plurality of radiating elements each comprising a length of openended waveguide having a cut-off frequency between first and second operating frequencies of the antenna, wherein each of said plurality has a separate input for each of said operating frequencies and wherein each of said plurality has an E-plane bifurcation beginning at said separate inputs and extending along a partial length of said element; and means for terminating each of said plurality so that the radiating element has a first passband centered on the first operating frequency and a second passband centered on the second operating frequency.
Claim 2
Dependent Claim
103 words
A multiple frequency waveguide antenna comprising: a plurality of radiating elements each comprising a length of openended waveguide having a cut-off frequency between first and second operating frequencies of the antenna, wherein each of said plurality has a separate input for each of said operating frequencies and wherein each of said plurality has an E-plane bifurcation beginning at said separate inputs and extending along a partial length of said element; and means for terminating each of said plurality so that the radiating element has a first passband centered on the first operating frequency and a second passband centered on the second operating frequency.
Claim 3
Dependent Claim
22 words
A waveguide antenna according to claim 1, wherein each of said plurality terminates open-ended at an aperture in a conducting ground plane.
Claim 4
Dependent Claim
18 words
A waveguide antenna according to claim 2, wherein a slice of dielectric material is provided at said aperture.
References Cited (Backward Citations)
US2658145A
Cited
US3761937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |