| 摘要 |
A wireless communication module (100) includes a directional coupling circuit (4), a first switch circuit (3), a first transmission circuit (1) for a first frequency band, a second transmission circuit (2) for a second frequency band, and a power detecting circuit (5). The magnitude of the electric power of a transmission signal at the input port of the directional coupling circuit (4) is constant regardless of the frequency of the transmission signal. A difference is made in the amount of electric power attenuation in a path from the input port of the directional coupling circuit (4) to the input port of the power detecting circuit (5) between the first frequency band and the second frequency band. The first switch circuit (3) is switched according to the magnitude of electric power detected by the power detecting circuit (5). |
