Repeater

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2005-05-03

2005-05-03

Ghebretinsae, Temesghen (Department: 2637)

Pulse or digital communications

Repeaters

C370S274000, C370S315000, C379S338000, C455S007000

Reexamination Certificate

active

06888881

ABSTRACT:
A relay station is composed of a main reception antenna1for receiving both a radio wave of a parent station and a go-around radio wave of a relay station, a subsidiary reception antenna2for receiving the go-around radio wave of the relay station, a changeable attenuator3and a phase shifting unit4for changing an amplitude and phase of a signal received in the subsidiary reception antenna2, a composite signal producing unit5for producing a composite signal from a signal received in the main reception antenna1and the signal sent from the phase shifting unit4, an electric power detecting unit9for obtaining a composite electric power from a composite voltage extracted in a directivity coupling unit8, and a microcomputer10for controlling a change of amplitude in the changeable attenuator3and a change of phase in the phase shifting unit4so as to minimize an average value of the composite electric power obtained in the electric power detecting unit9.

REFERENCES:
patent: 4701935 (1987-10-01), Namiki
patent: 0 801 474 (1997-10-01), None
patent: 11-298421 (1999-10-01), None
Kouji Kawashima et al.: “Chijo-ha Digital TV Housou no SFN Chuukei ni okeru Mawarikomi-ha Canceller” Denshi Joho Tsuushin Gakkai Gihou It 98-11 May 1998.
H. Suzuki, et al., Vehicular Technology Conference, pp. 1516-1520, XP-010353231, “A Booster Configuration with Adaptive Reduction of Transmitter-Receiver Antenna Coupling for Pager Systems”, Sep. 19, 1999.
Patent Abstracts of Japan, JP 11-298421, Oct. 29, 1999.

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