Telecommunications device using electromagnetic waves

Details Telecommunications device using electromagnetic waves Telecommunications device using electromagnetic waves

1991-11-15

1992-12-22

Sotomayor, John B.

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

Radar transponder system

342 44, 342 51, G01S 1380

Patent

active

051737051

ABSTRACT:
The disclosure relates to the field of data exchange by microwaves between a fixed station, or reader, and a mobile station, or badge. To achieve economy in the energy consumption of the badge, which has a "chip card" format, its input circuit or modem connected to the antenna does not transmit the modulated signal towards the reader. It reflects, in varying degrees, the carrier transmitted by the reader. The modulation of the reflection coefficient of the antenna is obtained by variation of the gate-source junction capacitance, which it itself related to the variation of the gate-source bias voltage of the input transistor of the modem. Application to remote-control toll-gates, remote money transactions and security checks.

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Patent Abstracts of Japan, vol. 14, No. 288 (E-943)[4231], Jun. 21, 1990, & JP-A-2-90746, Mar. 30, 1990, I. Takano, "Digital Transmitter".

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