| 摘要 |
PROBLEM TO BE SOLVED: To effectively reduce radiated noise from an antenna due to operation of a local oscillator. SOLUTION: A signal having a frequency corresponding to a channel selection signal output from a control circuit 130 is generated by a local oscillation circuit in a received signal processing circuit 120. The local oscillation signal which is thus generated and some of prescribed higher harmonic signals travel from the received signal processing circuit 120 toward an antenna switching circuit 110, but are trapped by a trap filter part 200. Consequently, the local oscillation signal originating from the local oscillation circuit and signals of frequencies of prescribed higher harmonics are effectively prevented from reaching an antenna ATA1 or antenna ATA2. COPYRIGHT: (C)2007,JPO&INPIT
|
