| 摘要 |
PROBLEM TO BE SOLVED: To improve attenuation characteristics outside a passband.SOLUTION: A filter comprises: one or a plurality of series resonators S connected in series between an input terminal In and an output terminal Out; one or a plurality of parallel resonators P connected in parallel between the input terminal and the output terminal; a first inductor L1 whose one end is connected to at least the input terminal or the output terminal; a second inductor L2 whose one end is connected to a terminal on the ground side of at least one parallel resonator of the one or the plurality of the parallel resonators; and a third inductor L3 connected between a first node N1 connecting the other end of the first inductor and the other end of the second inductor and a ground. |
