Telecommunications – Transmitter – Modulation by absorption – shielding – or reflecting
Patent
1996-01-29
1998-10-06
Eisenzopf, Reinhard J.
Telecommunications
Transmitter
Modulation by absorption, shielding, or reflecting
342 6, 342 45, H01Q 1500, H04B 700, G01S 1378
Patent
active
058191640
ABSTRACT:
A modulated retroreflection system for secure two-way communication and identification includes a transceiver at a first location and a transponder at a second location. The transponder receiving, modulating, and reflecting the signal back to the transceiver includes a retroreflector having a at least one reflective surface coated with an electro-responsive material. The electro-responsive material modulating the reflection coefficient of the reflective surface thereby modulating signals reflected by the surface. The transponder further includes a modulator electrically connected to the electro-responsive material for applying a modulated bias voltage thereby modulating the refractive index and consequently the electrical phase, and/or amplitude of the reflected signal.
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Proceedings of the Advanced Ceramic Technology for Electronic Applications onference, U.S. Army CECOM, Fort Monmouth, N.J., Sep. 28, 1993.
Babbitt Richard W.
Sun Xiaoguang G.
Eisenzopf Reinhard J.
Kincaid Lester G.
The United States of America as represented by the Secretary of
Tracor Aerospace Electronic Systems, Inc.
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