| 摘要 |
PROBLEM TO BE SOLVED: To provide a booster of receiving, amplifying and transmitting radio waves of a close frequency band which eliminates an excessive input caused in such a manner that a signal of a different band mixes in an amplifier for amplifying radio waves in respective bands, suppresses distortion generation, and reduces power consumption. SOLUTION: Both an outgoing signal and an incoming signal are once converted into an intermediate frequency signal of a low frequency, a first filter 104 and a second filter 109 perform band limitation of the intermediate frequency signal, the signal subjected to the band limitation is subjected to frequency conversion into the original radio frequency again to be amplified by variable amplifiers 107 and 111, and the amplified signal is transmitted to a mobile machine or a base station. |
