Tuned antenna resonant circuit of a passive transponder

Details Tuned antenna resonant circuit of a passive transponder Tuned antenna resonant circuit of a passive transponder

2005-10-04

2005-10-04

Urban, Edward F. (Department: 2685)

Telecommunications

Transmitter and receiver at separate stations

Near field

C455S019000, C340S572500, C340S010100, C343S7000MS

Reexamination Certificate

active

06952560

ABSTRACT:
A tuned antenna resonant circuit substantially increases the range of a passive transponder in a high-frequency electromagnetic carrier field, in that the real and imaginary parts of the impedance associated with the contact surface of the antenna contact are minimized and the energy absorbed from the carrier field by a serial resonant circuit is used to the greatest possible extent for generating the supply voltage for the integrated circuit of the transponder.

REFERENCES:
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patent: WO98/03938 (1998-01-01), None
Klaus Finkenzeller, RFID Handbuch, “Grundlagen und praktische Anwendungen induktiver Funkanlagen, Transponder und kontakloser Chipkarten”, Carl Hanser Verlag, Muenchen Wein, Federal Republic of Germany, 2ndEd., 2000, pp. 121.

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