Repeater
First Claim
1. A relay device, in which a radio wave of a parent station is received and amplified and a transmission radio wave having the same frequency as that of the radio wave of the parent station is transmitted, comprising:
- a main reception antenna for receiving both the radio wave of the parent station and a go-around radio wave of a relay station;
a subsidiary reception antenna for receiving the go-around radio wave of the relay station;
a changeable attenuator for changing an amplitude of a signal of the go-around radio wave received by the subsidiary reception antenna;
a phase shifter for changing a phase of the signal of the go-around radio wave received by the subsidiary reception antenna;
a composite signal producer for producing a composite signal from a signal of the radio wave of the parent station received by the main reception antenna, the signal of the go-around radio wave of the relay station and the signal of which the amplitude is changed by the changeable attenuator and the phase is changed by the phase shifter;
a directivity coupler for extracting a composite voltage of the composite signal output from the composite signal producer;
an electric power detector for obtaining a composite electric power from the composite voltage extracted by the directivity coupler; and
a microcomputer for controlling both a change of the amplitude performed by the changeable attenuator and a change of the phase performed by the phase shifter so as to minimize an average value of the composite electric power obtained by the electric power detector.
1 Assignment
0 Petitions
Accused Products
Abstract
A relay station is composed of a main reception antenna 1 for receiving both a radio wave of a parent station and a go-around radio wave of a relay station, a subsidiary reception antenna 2 for receiving the go-around radio wave of the relay station, a changeable attenuator 3 and a phase shifting unit 4 for changing an amplitude and phase of a signal received in the subsidiary reception antenna 2, a composite signal producing unit 5 for producing a composite signal from a signal received in the main reception antenna 1 and the signal sent from the phase shifting unit 4, an electric power detecting unit 9 for obtaining a composite electric power from a composite voltage extracted in a directivity coupling unit 8, and a microcomputer 10 for controlling a change of amplitude in the changeable attenuator 3 and a change of phase in the phase shifting unit 4 so as to minimize an average value of the composite electric power obtained in the electric power detecting unit 9.
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Citations
4 Claims
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1. A relay device, in which a radio wave of a parent station is received and amplified and a transmission radio wave having the same frequency as that of the radio wave of the parent station is transmitted, comprising:
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a main reception antenna for receiving both the radio wave of the parent station and a go-around radio wave of a relay station;
a subsidiary reception antenna for receiving the go-around radio wave of the relay station;
a changeable attenuator for changing an amplitude of a signal of the go-around radio wave received by the subsidiary reception antenna;
a phase shifter for changing a phase of the signal of the go-around radio wave received by the subsidiary reception antenna;
a composite signal producer for producing a composite signal from a signal of the radio wave of the parent station received by the main reception antenna, the signal of the go-around radio wave of the relay station and the signal of which the amplitude is changed by the changeable attenuator and the phase is changed by the phase shifter;
a directivity coupler for extracting a composite voltage of the composite signal output from the composite signal producer;
an electric power detector for obtaining a composite electric power from the composite voltage extracted by the directivity coupler; and
a microcomputer for controlling both a change of the amplitude performed by the changeable attenuator and a change of the phase performed by the phase shifter so as to minimize an average value of the composite electric power obtained by the electric power detector. - View Dependent Claims (2, 3, 4)
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Specification