Passive transponder apparatus for use in an interrogator-respond

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed

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343 65R, 343 65SS, 343 68R, G01S 956

Patent

active

041141512

ABSTRACT:
A passive transponder for use in an interrogator-responder communication system is disclosed, including a first signal receiving element having a variable reflection property, a code signal generator for supplying a code signal, a modulating device responsive to the code signal for varying the signal reflection property of the first signal receiving element, and a power supply for supplying direct-current operating power to the code signal generator and to the modulating device, the power supply including a second signal receiving element for receiving a second electromagnetic signal having a second frequency different from the first frequency, and an a-c to d-c converter for converting the second signal to direct-current power.

REFERENCES:
patent: 3098971 (1963-07-01), Richardson
patent: 3377616 (1968-04-01), Auer, Jr.
patent: 3754250 (1973-08-01), Bruner
patent: 3859624 (1975-01-01), Kriofsky et al.
patent: 3893111 (1975-07-01), Cotter
patent: 3914762 (1975-10-01), Klensch
patent: 3922673 (1975-11-01), Bishop
Proceedings of the IEEE, Aug. 1975, pp. 1260-1261, Koelle et al., "Short Range Radio-Telemetry . . . Using Modulated RF Backscatter".

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