| 摘要 |
<p>PURPOSE:To provide a small-sized duplexer without degrading the frequency characteristic. CONSTITUTION:In the equivalent circuit, an LC resonance circuit 5 on the low frequency pass side and an LC resonance circuit 6 on the high frequency pass side are connected in series between terminals 1 and 2. An antenna 8 is connected to a terminal 3. A coil L3 is connected in parallel to a coil L4 and a capacitor C3 connected in series, and a coil L2 is connected in series to the circuit consisting of coils L3 and L4 and the capacitor C3, thereby constituting the circuit 6. Further, the inductance of the coil 14 is set to >=1/100 inductance of the coil 13.</p> |
