BI-STATIC CIRCULARLY SYMMETRIC RETRODIRECTIVE ANTENNA

• US 3,754,257 A
• Filed: 02/25/1972
• Issued: 08/21/1973
• Est. Priority Date: 02/25/1972
• Status: Expired due to Term

• Current Assignee: Coleman H. Paris
• Original Assignee: Coleman H. Paris
• Inventors: Coleman, H. Paris
• Primary Examiner(s): Borchelt, Benjamin A.
• Assistant Examiner(s): Berger, Richard E.
• Application Number:
  US05/229,368
• Time in Patent Office: 543 Days
• Field of Search: 343/1TD,854 325/14
• US Class Current: 342/370
• CPC Class Codes: H01Q 3/34 by electrical means active lenses or reflecting arrays H01Q3/46

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.

Claims

1. 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.

2. The system as claimed in claim 1 wherein said multimodal network means comprises:

a Butler matrix.

3. The system as claimed in claim 2 wherein said selected pair of mode terminals comprise:

mode 0 and mode 1.

4. The system as claimed in claim 1 wherein circulator means are disposed between said transponding means and said mode terminals.

5. 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.