| 摘要 |
PROBLEM TO BE SOLVED: To maximize the C/N ratio of a diversity synthesized signal without being influenced by variations in ambient conditions. SOLUTION: A diversity reception device includes: a plurality of antennas 1, 3; a plurality of receiver circuits 2, 4 respectively connected to the corresponding antennas; an adder 8 for adding the received signals outputted from the receiver circuits 2, 4; phase shifters 7, 10 for bringing the phases of the received signals given to the adder 8 into an in-phase state with each other; a level comparator unit 11 for comparing the levels of the received signals outputted from the receiver circuits 2, 4; level variable units 6, 9 interposed between each of the receiver circuits 2, 4 and the adder 8 and controlled by the level comparator unit 11. The level variable units 6, 9 relatively attenuate the other received signal than that with a maximum level in proportion to the level difference between the other received signal and the received signal with the maximum level and give the attenuated level to the adder 8. COPYRIGHT: (C)2005,JPO&NCIPI
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