| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in the conventional art wherein two directional couplers are necessary, so that the number of components is increased and occupied areas of the components on a printed board of a mobile communication apparatus are enlarged, since a directional coupler is required for each filter. SOLUTION: This signal separation device is provided with a first filter and a second filter which are connected with a terminal for an antenna in common. A coil for power detection is electromagnetically coupled with a transmission line between a connection point of the first filter and the second filter and the terminal for an antenna, and is connected between a connecting terminal and a separating terminal. As a result, the number of components and occupied areas of the components on a printed board of a mobile communication apparatus can be reduced.
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