Microwave transponder system with polarising resonant plane antenna

Abstract

Abstract Microwave system for remote data transmission, of the type comprising at least one reader (L) associated with a plurality of transponders (R), the reader (L) including means of generating a microwave having a certain linear polarisation, whereas each transponder (R) is provided with a flat rectangular retransmission antenna (1) able to receive the said microwave and retransmit it in accordance with an orthogonal polarisation with a two-state phase modulation representing the information to be transmitted to the reader (L), characterised in that the phase modulation is obtained by means of two transistors (Qa, Qb) connected respectively to two adjacent corners (a, b) of the antenna (1), these two transistors being alternately blocked and saturated in time with the information to be transmitted, by complementary control signals output by an appropriate processing unit (4), so as to alternately short-circuit the corresponding corner of the antenna. <IMAGE>

Inventors

• 👤 Christian Meunier

Bibliographic Details