Active antenna for two-way transmission

Details Active antenna for two-way transmission Active antenna for two-way transmission

1991-03-14

1994-01-18

Ng, Jin F.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 84, 340505, 307570, 343876, H04B 146

Patent

active

052806332

ABSTRACT:
This active antenna is incorporated in the terminal station of a system for data exchange with a central station, by the modulation of a microwave carrier. The terminal station is of the chip card type. The modem of the active antenna is constituted by a transistor, the bias current of which is switched over from a low value at demodulation to a high value at modulation. The switch-over is obtained by a circuit with three resistors (R.sub.d, R.sub.gd, R.sub.g), which themselves have their values switched over by two transistors parallel connected with the resistors, these transistors being controlled by two signals emitted by the control circuit of the terminal station. The active antenna can be applied to long-distance data exchange, for example in the remote management of toll-charge systems, remote cash dispensing, localization of moving bodies etc.

REFERENCES:
patent: 4104630 (1978-08-01), Chasek
patent: 4504796 (1985-03-01), Igarashi
patent: 4591803 (1986-05-01), Saleh
Radio Electronics, pp. 58-60 Mar. 1978.

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