| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an antenna multicoupler small in size, low in insertion loss and reduced in the deterioration of Q0 (Q at center frequency) of a resonance system. SOLUTION: A transmitter side circuit 25 has a frequency variable band block filter circuit 27 and a phase circuit 29. A series circuit consisting of band variable capacitors C3, C4 and PIN diodes F1, D2 is connected electrically in parallel with a resonator of the frequency variable band block filter circuit 27. The transmitter side circuit 25 has two different pass bands to control a voltage applied to an electric control terminal CONT1 so as to connect the band variable capacitors C3, C4 to ground or to open them. A receiver side circuit 26 has a frequency variable trap circuit 28, a phase circuit 29 and a surface acoustic wave circuit 30. The surface acoustic wave filter circuit 30 is made up of two surface acoustic wave filter elements 11, 12 whose pass band differs from each other.</p> |
