| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna sharing device corresponding to the respective radio communication modes of a duplex operation, a two wave simplex operation and one wave simplex operation. SOLUTION: For setting the duplex operation mode, SW1 is thrown to an a-side and SW2 is thrown to a b-side. Thus, a signal from a transmission part 3 is transmitted from an antenna 2 through SW1 and an fr notch filter 1b. The signal received by the antenna 2 is sent to a reception part 4 through and ft notch filter 1c and SW2. The fr notch filter 1b inhibits a reception signal component and the ft notch filter 1c inhibits a transmission signal component. In the case of a two wave simplex operation mode, SW1 is thrown to the a-side at the time of transmission and SW2 to the b-side at the time of reception. In the case of a one wave simplex operation mode, SW1 is thrown similarly to the two wave simplex operation mode but SW2 to the a-side. The received in the one wave simplex operation mode is inputted to the reception part 4 through a line 1e between SW1 and SW2.
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