| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio telephone system which can secure impedance matching between a transmitting circuit and an antenna by detecting an approaching a human body. SOLUTION: In this radio telephone system, an antenna 44 transmits the signals outputted from both transmitting and receiving circuits into the air, a human body detection part 63 detects the approaching human body and a communication control part 30 controls a variable impedance matching part 43 according to the detection result of the part 63 to secure impedance matching between a radio transmitting/receiving part 40 and the antenna 44. In such a constitution, the transmission power is sent from the part 40 to the antenna 44 with no attenuation and then radiated from the antenna 44 as the radio wave with high efficiency.
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