H - Electricity – 01 – P
Patent
H - Electricity
01
P
343/12, 343/19
H01P 7/06 (2006.01) B61L 25/04 (2006.01)
Patent
CA 1065027
ABSTRACT OF THE DISCLOSURE An answering device in a system for automatic wireless transmission of an item of information coded by a plurality of frequencies is disclosed herein. An interrogation device movable with respect to the answering device transmits an interrogation signal having a frequency which periodically varies within a predetermined microwave frequency band. The answering device has a plurality of microwave resonators, each of which has a fixed frequency. A microwave diode is coupled to each of the resonators for preventing a response to the interrogation signal by either damping or detuning the resonator fixed frequency when a control voltage is applied. The control volt- age means connected to each of the microwave di?des switches certain of the resonators to an inoperative condition to esta- blish a set of frequencies at which the resonators will respond which corresponds to the information to be transmitted.
253208
Becker Friedbert
Laufer Karl
Steinkamp Johann A.
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