High impedance transponder with improved backscatter modulator f

Details High impedance transponder with improved backscatter modulator f High impedance transponder with improved backscatter modulator f

1998-08-24

2000-04-25

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

3405721, 3406931, 342 27, 342 44, 342 51, G08B 13187

Patent

active

060549254

ABSTRACT:
A transponder 20 for an electronic identification system transponder is characterized in that it presents a high input impedance (>400.OMEGA.) at an input thereof which is directly connected to an antenna 22 with a matched high input impedance. The transponder is aimed at improving the voltage recovered on capacitor C.sub.2 from an interrogation signal and thus the operational range of the system. The modulator 30 of the transponder is arranged to backscatter modulate the interrogation signal at a modulation depth of less than 80%, preferably in the order of 30%. This also results in an improvement of the operational range of the system.

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