Diode modulator for radio frequency transponder
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United States of America Patent
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Feb 25, 1997
Grant Date -
N/A
app pub date -
Aug 31, 1995
filing date -
Aug 31, 1995
priority date (Note) -
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Abstract
A diode modulator which is not part of the rectifier power supply circuit of an RF Transponder is controlled by the transponder electronic logic and memory circuitry to conduct RF current from a second terminal to a first terminal of the RF Transponder antenna in a first state of the transponder electronic circuitry, and does not conduct appreciable current in a second state of the transponder electronic circuitry, thereby changing the loading of the RF Transponder antenna between the first state and the second state of the transponder electronic circuitry, and thereby changing the intensity of the RF radiation backscattered from the RF Tag. The present invention has further advantages that the same diode used as a modulator can also be used in the transponder receiver circuit.
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