RF identification transponder

Details RF identification transponder RF identification transponder

1997-11-12

1999-08-31

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

342 51, 342175, G01S 1376

Patent

active

059459387

ABSTRACT:
An RF identification transponder comprises a substrate layer, and an array of M*N antenna elements formed on the substrate layer, where M and N are integers. The antenna elements have a common predetermined resonant frequency f.sub.r. The resonant frequency of the transponder's antenna element array allows it to be identified apart from other transponders, each having an antenna element array with a different resonant frequency.

REFERENCES:
patent: 3496570 (1970-02-01), Lewis
patent: 3731313 (1973-05-01), Nagal
patent: 4283729 (1981-08-01), Richardson
patent: 4926187 (1990-05-01), Sugawara et al.
patent: 5254997 (1993-10-01), Cohn
patent: 5361071 (1994-11-01), Van Zon
patent: 5622886 (1997-04-01), Allum et al.
Frequency-Scanned Grating Consisting of Photo-Etched Arrays, F. Stefan Johansson, IEEE Transactions on Antennas and Propagation, vol. 37, No. 8, Aug., 1989.

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