Dual resonant antenna circuit for RF tags

Details Dual resonant antenna circuit for RF tags Dual resonant antenna circuit for RF tags

1992-10-07

1994-05-31

Hajec, Donald

Communications: radio wave antennas

Antennas

Loop type

340572, H01Q 2100, G08B 1324

Patent

active

053173309

ABSTRACT:
A two-way communication system is provided having a stationary device and a portable passive device. The portable passive device has circuitry for storing and transmitting coded information. The stationary member transmits a signal at a first frequency via magnetic field and the portable passive device transmits coded information stored on circuitry provided therein at a second frequency also via a magnetic field. An antenna circuit is provided in the portable passive device having a parallel resonant circuit and a series resonant circuit. The parallel resonant circuit derives operating power from the signal at a first frequency for use in the circuitry provided in the portable passive device. The series resonant circuit transmits coded information at a second frequency.

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patent: 5084699 (1992-01-01), DeMichele
patent: 5099226 (1992-03-01), Andrews
patent: 5099227 (1992-03-01), Geiszler et al.
patent: 5241298 (1993-08-01), Lian et al.

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