Identification system using coded passive transponders

Details Identification system using coded passive transponders Identification system using coded passive transponders

1977-04-22

1978-06-20

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

333 30R, G01S 956

Patent

active

040964779

ABSTRACT:
An identification system including a transmitter, a receiver, a decoding subsystem, and a passive transponder identifier. One passive transponder identifier of the invention is a surface acoustic wave device provided with pad means for applying and removing pressure on a substrate of the device at preselected locations. A second identifier of the invention is a microacoustic shear bulk wave device. The passive transponder identifiers are programmed to produce a characteristic coded electronic reply in response to an electromagnetic signal interrogation.

REFERENCES:
patent: 3706094 (1972-12-01), Cole et al.
patent: 3961290 (1976-06-01), Moore

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