H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/12
H04B 7/15 (2006.01) G01S 7/02 (2006.01) G01S 13/75 (2006.01) G06K 7/00 (2006.01) G06K 19/07 (2006.01)
Patent
CA 2035939
Hyperfrequency system for remote data transmission of the type comprises at least one reader associated with a plurality of responders with the reader comprising means to generate a hyperfrequency wave which has a certain rectilinear polarization, while each responder is fitted with a rectangular flat antenna for remission which is capable of receiving said hyperfrequency wave and re- emitting it with orthogonal polarization and phase modulation at two stages representing the data to be transmitted to reader, characterized in that the phase modulation is achieved by two transistors which are connected respectively to two adjacent corners of antenna, these two transistors being alternately blocked and saturated at the rhythm of the data to be transmitted, by additional control signals originating in an appropriate processing unit in order to short circuit alternately the corresponding corer of the antenna.
Compagnie de Signaux Et D'equipements Electroniques
Fetherstonhaugh & Co.
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