RF transponder system with parallel resonant interrogation series resonant response
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United States of America Patent
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Mar 4, 1997
Issued Date -
N/A
app pub date -
May 16, 1996
filing date -
Sep 30, 1994
priority date (Note) -
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Abstract
A transponder system employs a transponder antenna with a distributed inductance and capacitance that exhibit parallel and series resonant frequencies. Transmissions to the transponder circuit are made at one or more parallel resonant frequencies to maximize the excitation of the transponder circuit, while return signals transmitted back from the transponder are modulated at one or more series resonant frequencies to maximize the signal current. The transponder antenna is implemented as a pair of aligned coils on opposite sides of a thin dielectric substrate, with the coils connected together through the substrate at one point and the substrate thickness not more than about 25 microns to obtain a significant mutual inductance between the coils.
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