Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1985-09-26
1986-06-03
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455276, 455278, H04B 708
Patent
active
045934134
ABSTRACT:
A space-diversity receiving system for microwave band radio communication including two antennas and receivers, an endless phase shifter, a hybrid combiner, a hybrid distributor, a voltage controlled oscillator, a signal mixer, a low pass filter, a detector, and a control circuit.
Microwaves received by the antennas are detected by the receivers. One received signal is directly applied to the hybrid combiner. The other received signal is applied to the hybrid combiner via the endless phase shifter. The hybrid combiner combines these signals and outputs to the hybrid distributor. The hybrid distributor distributes the amplified output to as an intermediate frequency output and a sub output. The voltage controlled oscillator generates a series of sequential frequencies based on the control of its input voltage. The signal mixer mixes the sub output with the each sequential frequency output. The detector detects the mixed signal and transmits the detected signal to the control circuit. The control circuit controls the endless phase shifter and the voltage controlled oscillator based on the deviation in the intermediate frequency band and the detection of the reception level so as to minimize the amplitude deviation of the combined IF output signal by using a microprocessor.
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patent: 3311832 (1967-03-01), Schrader
patent: 4079318 (1978-03-01), Kinoshita
patent: 4326294 (1982-04-01), Okamoto et al.
patent: 4386435 (1983-05-01), Ulmer et al.
patent: 4498885 (1985-02-01), Namiki
Patent Abstracts of Japan, unexamined applications, Section E, vol. 5, No. 171, Oct. 30, 1981.
Patent Abstracts of Japan, unexamined applications, Section E, vol. 5, No. 137, Aug. 29, 1981.
European Search Report, Vienna, 07-31-85.
Fujitsu Limited
Ng Jin F.
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