Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Unique identity
Patent
1985-10-31
1987-10-27
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Unique identity
342 51, G01S 1374
Patent
active
047033274
ABSTRACT:
Interrogator/receiver apparatus is disclosed for transmitting a first signal to, and receiving a second signal from a remote transponder. In the preferred embodiment, the transponder is a passive, surface acoustic wave device which receives the first signal, processes this signal and transmits, in reply, the second signal which includes a unique identification code. The interrogator/receiver apparatus includes (1) a common RF unit for generating the first (interrogation) signal and (2) a plurality of transmitter/receiver heads, each remote from, and coupled to the common signal generator, for transmitting the first signal to, and receiving the second signal from a transponder or transponders in its vicinity. Advantageously, each transmitter/receiver head includes a signal mixer which performs four quadrant multiplication of the first signal by the second signal to produce a third, audio frequency signal containing frequencies equal to the instantaneous difference between the frequencies of the first and second signals. One of the mixer inputs is coupled to the RF transmission line connected to the common RF signal generator, or to a transmit amplifier connected to the transmission line; the other mixer input is connected to a directional coupler that, in turn, is connected to a common transmit/receive antenna. This directional coupler operates to pass the first signal from the transmission line, or transmit amplifier, to the antenna and to pass the second signal from the antenna to the mixer.
REFERENCES:
patent: 3870994 (1975-03-01), McCormick et al.
patent: 4059831 (1977-11-01), Epstein
patent: 4297701 (1981-10-01), Henriques
patent: 4620191 (1986-10-01), Skeie
patent: 4625207 (1986-11-01), Skeie
patent: 4625208 (1986-11-01), Skeie et al.
Nysen Paul A.
Rossetti Anthony J.
Hayes, Jr. Donald E.
Milde Jr. Karl F.
Tarcza Thomas H.
X-Cyte Inc.
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