| 摘要 |
PURPOSE:To suppress a component of a transmitting signal mixed in a receiving signal in the step of synthesis, and to bring transmitting and receiving frequency close to each other, by adjusting by an equalizer one of amplitude or phase of a branch signal branching from a transmitting signal, and synthesizing an output of its equalizer and a receiving signal. CONSTITUTION:A transmitting signal from a transmitter 5 is applied to an antenna 7 by a circulator 3 through a transmitting filter 9 of a common use device 15 of antenna. Also, a receiving signal from the antenna 7 is applied to the circulator 3, and its output is supplied to a receiving filter 10. By this transmitting filter 9, a part of the transmitting signal is branched, and a branched signal 21 is applied to an equalizer 12. This equalizer 12 is constituted of an amplitude adjusting device 13 and a phase adjusting device 14, the adjusting quantity of this equalizer 12 is set in advance by transmitting frequency information 22 from the transmitter 5, the amplitude of the signal 21 is made equal to output amplitude of the filter 10, and the phase is made opposite to output phase of the filter 10. Subsequently, an output of the filter 10 and an output of the equalizer 12 are synthesized by a synthesizer 11, and the residual transmitting signal component is eliminated. |
