| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio reception device and a radio communication system which eliminate the need for movement and adjustment of an antenna when receiving a radio wave having varies in electric field intensity owing to a height pattern or when adapted to change in arrival direction of a radio wave. Ž<P>SOLUTION: The radio reception device includes first and second antennas 10 and 20 disposed vertically apart from each other, a rat race circuit 31 which includes first and second ports connected to the first and second antenna 10 and 20 respectively, and outputs a composite high-frequency signal from third and fourth ports, and a selector switch circuit 33 which includes first to fourth open contacts connected to the first to fourth ports of the rat race circuit 31 respectively and selects and connects one of the contacts to a following stage. The first and second ports are connected by transmission lines having such an electric length that the impedance obtained by viewing the first and second contacts from the first and second ports is infinite, and the third and fourth ports are connected by transmission lines having such an electric length that the impedance obtained by viewing the third and fourth contacts from the third and fourth ports is zero. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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