Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-12-20
1985-12-03
Jordan, Charles T.
Communications: electrical
Continuously variable indicating
With meter reading
367 2, 343 65R, H04Q 900, G01S 1378, H04B 159
Patent
active
045568839
ABSTRACT:
Transmitting and receiving circuit for an apparatus for the automatic identification of objects and/or living organisms, including a stationary interrogator and a transponder fastened to the object or living organism to be identified, the interrogator including an energy transmitter, a signal transmitter, a first directional coupler connected to the energy and signal transmitters for receiving outgoing waves from the transmitters and for decoupling a first energy component from the outgoing waves, a first transmitting and receiving antenna, a second directional coupler being connected in series with the first directional coupler and being connected to the first transmitting and receiving antenna for receiving returning waves from the transponder and for decoupling a second energy component from the returning waves, an adjustable attenuator connected to the first directional decoupler for receiving the first energy component, an adjustable phase shifter connected to the adjustable attenuator for receiving the first energy component, a third directional coupler having a first input connected to the adjustable phase shifter for receiving the first energy component, a second input connected to the second directional coupler for directly receiving the second energy component, and an output, the attenuator and the phase shifter being adjusted for providing a signal at the output of the third directional coupler with a minimum, and an evaluation unit connected to the output of the third directional coupler, and the transponder including an energy receiver, an energy converter connected to the energy receiver, a signal receiver, a signal demodulator connected to the signal receiver, a data processing unit connected to the signal demodulator, a reply transmitter connected to the data processing unit, and a second transmitting and receiving antenna connected to the energy receiver, signal receiver and reply transmitter.
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German Published Non-Prosecuted Application DE-OS 2919753, 11/27/80.
H. Groll: "Mikrowellen Messtechnik", (Microwave Measurement Technology), Friedrich Viebig & Sohn publishers, Brunswick, 1969, p. 217, FIG. 6.7.
Brown Boveri & Cie AG
Jordan Charles T.
Jorgensen Adam A.
Lerner Herbert L.
Steinberger Brian S.
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