| 摘要 |
PROBLEM TO BE SOLVED: To reduce loss of a signal caused by switching receiving bands. SOLUTION: A receiving band switching circuit is provided with: a first high frequency circuit 11 for which a signal a first frequency band passes through; a second high frequency circuit 12 which a signal of a second frequency band passes through; and a third high frequency circuit 14 provided at the post stage of the first high frequency circuit 11 and the second high frequency circuit 12. The third high frequency circuit 14 is constituted of a balancing circuit having a balancing input terminal, the first high frequency circuit 11 is connected to one 13a of the balancing input terminal, the second high frequency circuit 12 is connected to the other 13b of the balancing input terminal, the other 13b of the balancing input terminal is grounded when the signal of the first frequency band outputted from the first high frequency circuit 11 is inputted to the third high frequency circuit 14, and the one 13a of the balancing input terminal is grounded when the signal of the second high frequency band outputted from the second high frequency circuit 12 is inputted to the third high frequency circuit 14. COPYRIGHT: (C)2006,JPO&NCIPI
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