| 摘要 |
PURPOSE:To simplify the adjustment for detecting a transmission power excluding a directive connector by connecting an output terminal of a transmitter and an input terminal of a transmitted power detector with a lambda/4 line. CONSTITUTION:A transmission power of a transmitter 6 is transmitted from an antenna 9 through a transmission output terminal 7 while a part of the transmission power is applied to an input terminal of a transmission power detector 10 through a lambda/4 line 11 (lambda: wavelength of transmission frequency) connected to the transmission output terminal 7. Here, a capacitor or the like is added to an input circuit of a transmission power detector 10 to turn the input impedance of the detector 10 in the transmission frequency to a low impedance. The connection of the transmitter output terminal 7 to an input terminal of the detector 10 with a lambda/4 line enables the elevation of the impedance to a high impedance as viewed on the side of the detector 10 from the transmission output terminal 7 thereby facilitating the matching the transmission output terminal 7 with the antenna 9 side. This eliminates the conventional directive connector 8 enabling the realization of detecting transmission power at a low cost. |
