| 摘要 |
PROBLEM TO BE SOLVED: To provide a spread spectrum communication equipment by suppressing output power of an undesired signal other than a transmission signal frequency band without deteriorating a reception automtically and losing a transmission signal output power to realize improvement of a communication available distance. SOLUTION: An undesired signal outputted from a power amplifier section 51 is only harmonics generated by the power amplifier section 51 by providing a band pass filter between a transmission mixer 53 and the power amplifier section 51 to suppress the undesired signal at transmission due to a leakage of a local signal and an intermediate frequency signal or the like, and the undesired signal is sufficiently suppressed even when a simple low pass filter 2 only is adopted for a filter between a transmission reception changeover circuit 3 and an antenna connection terminal 1. As a result, a loss of the transmission signal power amplified and outputted by the power amplifier section 51 to the antenna connection terminal 1 is reduced and the communication available distance is increased. |
