US3754257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bi-static circularly symmetric retrodirective antenna
Assignee: United States Department of the Navy
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Filing: 1972-02-25
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Granted: 1973-08-21
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Expires: 1992-02-25
Abstract
Abstract A circularly symmetric antenna system capable of providing retro-directive retransmission of a modulated or an encoded incident signal, or having the ability of being employed as a bistatic relay where retransmission may be directed from the initiating station. Also the system may be used to provide selective automatic suppression of a retransmission in an unwanted direction.
Inventors
- 👤 H Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:47
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A transponding circularly summetric antenna system comprising: circularly symmetric antenna means for receiving an incident signal arriving at a particular angle; multimodal network means having pairs of mode terminals, said network means being coupled to said antenna means; transponding means coupled to a selected pair of said mode terminals for manipulating said signal; connecting means for applying said manipulated signal to said selected pair of said mode terminals whereby said manipulated signal is transmitted from said antenna means at a selected angle.
Claim 2
Dependent Claim
82 words
A transponding circularly summetric antenna system comprising: circularly symmetric antenna means for receiving an incident signal arriving at a particular angle; multimodal network means having pairs of mode terminals, said network means being coupled to said antenna means; transponding means coupled to a selected pair of said mode terminals for manipulating said signal; connecting means for applying said manipulated signal to said selected pair of said mode terminals whereby said manipulated signal is transmitted from said antenna means at a selected angle.
Claim 3
Dependent Claim
16 words
The system as claimed in claim 1 wherein said multimodal network means comprises: a Butler matrix.
Claim 4
Dependent Claim
20 words
The system as claimed in claim 2 wherein said selected pair of mode terminals comprise: mode 0 and mode 1.
Claim 5
Dependent Claim
20 words
The system as claimed in claim 1 wherein circulator means are disposed between said transponding means and said mode terminals.
Claim 6
Dependent Claim
89 words
The system as claimed in claim 1 wherein said transponding means comprises: a first and second receiver; said first receiver being connected to a first mode of said mode pair and said second receiver being connected to a second mode of said mode pair; phase detection means connected to said receivers for detecting the angle of the incident signal; a first processor means coupled to said phase detector means for controlling a phase shifter; whereby said phase shifter and said processor are able to control the angle of retransmission.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |