| 摘要 |
<p>There is provided a demultiplexer capable of suppressing affect of ripple at a higher band of a first band pass filter having a relatively low pass band frequency and obtaining a sufficiently large pass band width of the first and a second band pass filter. In the demultiplexer (1), the first band pass filter F1 having a relatively low pass band frequency and the second band pass filter F2 having a relatively high pass band frequency are respectively formed by an elastic surface wave filter of a ladder-type circuit configuration. The second band pass filter has first to third parallel resonators (P11, P12, P13). The first and the second parallel resonators (P11, P12) are commonly connected by a common connection GND terminal (23). A first inductance L1 is connected between the common connection GND terminal (23) and the ground potential. When the average value of all the parallel resonators (P11 to P13) is f0, f1 > f0 > f2 is satisfied.</p> |
