Input impedance arrangement for RF transponder

Details Input impedance arrangement for RF transponder Input impedance arrangement for RF transponder

2005-03-22

2005-03-22

Horabik, Michael (Department: 2635)

Communications: electrical

Selective

Interrogation response

C340S572700, C340S572500, C340S315000, C340S010510, C340S010400, C343S870000, C343S861000

Reexamination Certificate

active

06870460

ABSTRACT:
A transponder14.1for a radio frequency (RF) identification system comprises an antenna22.1having an antenna impedance (ZA) having a real part (RA) connected to transponder circuitry presenting a load impedance (ZL) having a real part (RL), a ratio(RLRA)of the real part (RL) of the load impedance and the real part (RA) of the antenna impedance having a first value that is bigger than one when the transponder is not transmitting data. During transmission of data the ratio is switched between the first value and a second smaller value.

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