Device for the exchange of data by electromagnetic waves

Details Device for the exchange of data by electromagnetic waves Device for the exchange of data by electromagnetic waves

1991-11-15

1994-06-07

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 78, 455 541, 331 51, 331117FE, H04B 140

Patent

active

053198026

ABSTRACT:
In order to increase the sensitivity and range of a system for the exchange of data by microwaves between a fixed station, or reader, and a mobile station, or badge, the modem of the badge includes an oscillator. A single transistor works, under a first bias, as a detector of the wave transmitted by the reader and demodulates this wave, and then, under a second bias, it works as an oscillator and modulates the response transmitted by the badge. Applications to the exchange of data at a distance.

REFERENCES:
patent: 2989745 (1961-06-01), Carroll
patent: 3673590 (1972-06-01), Corvi et al.
patent: 3918057 (1975-11-01), Van Tol
patent: 3925774 (1975-12-01), Amlung
patent: 4173016 (1979-10-01), Dickson
patent: 4609882 (1986-09-01), Gehring et al.
patent: 4672379 (1987-06-01), Bishop
Toshiba Review, No. 155, Spring 1986, pp. 19-23, Tokyo, M. Ohyama, et al., "Toshiba Programmablee Identification System, Tospid".
Toshiba Review, No. 155, Spring 1986, pp. 19-23, Tokyo, M. Ohyama, et al.,"Toshiba Programmable Identification System, Tospid".
Cyrogenics, vol. 28, No. 1, Jan. 1988, pp. 32-35, S. I. Cho, et al.,"Cryogenic UHF FET Oscillator for Magnetic Resonance Detection".

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