Transponder employing modulated backscatter microstrip double pa

Details Transponder employing modulated backscatter microstrip double pa Transponder employing modulated backscatter microstrip double pa

1995-10-31

1998-06-23

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

Microstrip

342 51, H01Q 138

Patent

active

057710210

ABSTRACT:
A reader interrogates a transponder attached to a remote object. The transponder includes a microstrip patch antenna having two segments connected together by a switch, each segment being one-half wavelength, the antenna being a full wavelength at the frequency of the interrogating signal. In response to a control signal, the switch is opened and closed, thereby coupling and decoupling the two segments of the microstrip antenna. When the switch is in the closed position, the two segments are out-of-phase with one another, thereby producing a maximum reflected signal. When the switch is in the open position, the two segments act in concert to produce a minimum backscattered signal. The backscatter signal is thus modulated in accordance with the control signal and is received at the reader where it is subsequently decoded to identify the remote object.

REFERENCES:
patent: 4786907 (1988-11-01), Koelle
patent: 5119099 (1992-06-01), Haruyama et al.
Gerald Hall, "The ARRL Antenna Book", The American Radio Relay League, 1983, pp. 2-6-2-10.

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