Passive encoding microwave transponder

Details Passive encoding microwave transponder Passive encoding microwave transponder

1976-02-12

1978-01-10

Hunt, Brooks H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 68LC, H01R 3900

Patent

active

040682323

ABSTRACT:
A passive transponder which provides remote identification of objects including cargo and trailers, vehicles or a variety of objects which move through an interrogator beam. The passive transponder is mounted onto the vehicle or object or at the location to be identified. A transmitted beam from the interrogator is directed to the transponder. Some of the beam's energy is rectified and used to power digital electronic circuitry within the transponder which generates a signal with a serially-coded digital waveform. This signal amplitude modulates a harmonic generator in the transponder which produces and emits harmonic energy derived from the incident beam from the interrogator. This harmonic energy is readily identified by an interrogator receiver which is tuned to that harmonic of the incident signal. The transponder information from the interrogator receiver is decoded in the interrogator data processor to provide the desired identification number. An internal clock frequency is generated within the passive transponder as a result of transmitted energy from the interrogator beam, and this clock determines the read-out rate of the encoded data from a field programmable read-only memory.

REFERENCES:
patent: 3389391 (1968-06-01), Keeler et al.
patent: 3689885 (1972-09-01), Kaplan et al.
patent: 3806905 (1974-04-01), Strenglein
patent: 3859624 (1975-01-01), Kriofsky
patent: 3914762 (1975-10-01), Klensch
patent: 3944928 (1976-03-01), Augenblick
patent: 3964024 (1976-06-01), Hutton et al.

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