Impedance matching of an electromagnetic transponder reader

Telecommunications – Transmitter and receiver at separate stations

Reexamination Certificate

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Details

C455S041100, C455S041300, C455S127100, C455S129000, C455S558000, C340S010300, C340S572700

Reexamination Certificate

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07603082

ABSTRACT:
A terminal for generating an electromagnetic field, including an oscillating circuit capable of receiving a high-frequency A.C. excitation voltage via an amplifier and a directional coupler, the oscillating circuit having at least one element of variable capacitance, and circuitry for modifying the value of this capacitance according to the amplitude of a signal extracted from the coupler.

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patent: 7369811 (2008-05-01), Bellantoni
patent: 7379714 (2008-05-01), Haque et al.
patent: 2004/0099738 (2004-05-01), Waters
patent: 2004/0233043 (2004-11-01), Yazawa et al.
French Search Report from French Patent Application No. 04/51316, filed Jun. 23, 2004.

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