| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna system that can be downsized by decreasing the number of circularly polarized wave antennas with respect to a plurality of frequency bands and suppress noise or the like by decreasing the number of coaxial cables and the length of a wire. SOLUTION: The antenna system is provided with a circularly polarized wave antenna A101 with a first frequency band, a circularly polarized wave antenna B102 with a second frequency band, and a common board 104, and the circularly polarized wave antennas A101, B102 are placed back to back on the front side and the rear side of the board 104. Further, a high frequency signal with the first frequency band transmitted/received from/by the circularly polarized wave antenna A101 and a high frequency signal with the second frequency band transmitted/received from/by the circularly polarized wave antenna B102 are given to a common diplexer 103, and its output is connected to an antenna connector of a wireless apparatus through a common coaxial cable 105. COPYRIGHT: (C)2005,JPO&NCIPI
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