Diode modulator for radio frequency transponder

Details Diode modulator for radio frequency transponder Diode modulator for radio frequency transponder

1995-08-31

1997-02-25

Lobo, Ian J.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Radar transponder only

34082554, H04B 159, H04Q 118

Patent

active

056063237

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.

REFERENCES:
patent: 4075632 (1978-02-01), Baldwin et al.
patent: 4345253 (1982-08-01), Hoover
patent: 4724427 (1988-02-01), Carroll
patent: 4786907 (1988-11-01), Koelle
patent: 5166676 (1992-11-01), Milheiser

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