| 摘要 |
PROBLEM TO BE SOLVED: To reduce the insertion loss of each transmission wave and to reduce the in-band amplitude deviation of each transmit wave as to the antenna common-use unit which supplies transmit waves of adjacent channels to an antenna. SOLUTION: This antenna common-use unit is equipped with a 1st filter group FG1, which passes transmission waves of even-numbered (or odd- numbered) channels and a 2nd filter group FG2 which is cascaded to the 1st filter group FG1 and passes transmit waves of the odd-numbered (or even- numbered) channels. In this case, the 1st filter group FG1 is constituted by cascading constant-impedance band-pass filters passing the transmit waves of the even-numbered (or odd-numbered) channels, and one cascaded constant- impedance band-pass filter is connected to the 2nd filter group FG2 and the other is connected to the antenna.
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