US4085404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phasing optimization at the feed probes of a parallel plate lens antenna
Assignee: Bendix Corp
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Filing: 1976-12-20
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Granted: 1978-04-18
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Expires: 1996-12-20
Abstract
Abstract In a microwave lens antenna of the parallel plate type for scanning a beam wherein a plurality of feed probes spaced along the focal arc are simultaneously excited in groups in accordance with weighting functions, the phases of the feed probes are optimized by predetermination of the lengths of the coaxial cables supplying energy to the feed probes.
Inventors
- 👤 Janice Anne Gallant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:56
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H01; H01Q; H01Q3/00; H01Q3/24; H01Q3/245; H01Q3/26; H01Q3/2664; H01Q3/44; H01Q3/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
A radar antenna system having a microwave lens and including a linear array of radiating elements for radiating energy into space comprising a parallel plate wave conducting means having a longitudinal axis and including a plurality of feed probes located along the focal arc of said lens, a plurality of output probes located along the output contour of said wave conducting means and coupled to said radiating elements, a source of exciting energy for said feed probes and means connecting said source of exciting energy to said feed probes and having an electrical length equal to: ##EQU3## where λ is the wavelength of said exciting energy, G is the linear distance between the intersections of said longitudinal axis with said focal arc and said output contour, d k is the linear distance between the k th feed probe and the intersection of said longitudinal axis and said output contour, and A is a constant electrical length.
Claim 2
Dependent Claim
156 words
A radar antenna system having a microwave lens and including a linear array of radiating elements for radiating energy into space comprising a parallel plate wave conducting means having a longitudinal axis and including a plurality of feed probes located along the focal arc of said lens, a plurality of output probes located along the output contour of said wave conducting means and coupled to said radiating elements, a source of exciting energy for said feed probes and means connecting said source of exciting energy to said feed probes and having an electrical length equal to: ##EQU3## where λ is the wavelength of said exciting energy, G is the linear distance between the intersections of said longitudinal axis with said focal arc and said output contour, d k is the linear distance between the k th feed probe and the intersection of said longitudinal axis and said output contour, and A is a constant electrical length.
Claim 3
Dependent Claim
49 words
The radar antenna system of claim 1 wherein said feed probes are spaced on said focal arc so that the radiated beam produced by energizing a first of said feed probes is orthogonal to a radiated beam produced by energizing the feed probe adjacent to said first feed probe.
Claim 4
Dependent Claim
36 words
The radar antenna system of claim 2 wherein said parallel plate wave conducting means is symmetrical about a longitudinal axis and said predetermined point lies at the intersection of said output contour and said longitudinal axis.
Claim 5
Dependent Claim
119 words
A radar antenna system comprising a parallel plate wave conducting means having a longitudinal axis and an output contour and a plurality of feed probes located along a focal arc, a source of exciting energy for said feed probes and a plurality of coaxial cables connecting said source to said feed probes, the electrical lengths of said cables being ##EQU4## where λ is the wavelength of said exciting energy, G is the linear distance between the intersections of said longitudinal axis with said focal arc and said output contour, d k is the linear distance between the k th feed probe and the intersection of said longitudinal axis and said output contour, and A is a constant electrical length.
Claim 6
Dependent Claim
119 words
A radar antenna system comprising a parallel plate wave conducting means having a longitudinal axis and an output contour and a plurality of feed probes located along a focal arc, a source of exciting energy for said feed probes and a plurality of coaxial cables connecting said source to said feed probes, the electrical lengths of said cables being ##EQU4## where λ is the wavelength of said exciting energy, G is the linear distance between the intersections of said longitudinal axis with said focal arc and said output contour, d k is the linear distance between the k th feed probe and the intersection of said longitudinal axis and said output contour, and A is a constant electrical length.
Claim 7
Dependent Claim
49 words
The radar antenna system of claim 4 wherein said feed probes are spaced on said focal arc so that the radiated beam produced by exciting a first of said feed probes is orthogonal to a radiated beam produced by exciting the feed probe adjacent to said first feed probe.
Claim 8
Dependent Claim
24 words
The radar antenna system of claim 4 wherein a plurality of contiguous feed probes is excited simultaneously in accordance with a predetermined weighting schedule.
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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |