| 摘要 |
PROBLEM TO BE SOLVED: To prevent a radio interference owing to a leakage current.SOLUTION: Semiconductor switching elements 21 are inserted between respective antennas An and transmission/reception ports (Tx/Rx Ports). Semiconductor switching elements 22 are inserted between respective junctions of the semiconductor switching elements 21 and the antennas An, and a ground. Control signals CTn turn on the semiconductor switching elements 21 connected to any antennas An selected for transmission/reception and turn off the corresponding semiconductor switching elements 22, and on the other hand, turn off the semiconductor switching elements 21 connected to the remaining antennas An and turn on the corresponding semiconductor switching elements 22. |
