Filter, duplexer and communication module

摘要

In a filter, two parallel resonators that are adjacent to each other are connected, in parallel, to a first portion of the signal line that connects a pair of two adjacent series resonators, at least one parallel resonator is connected, in parallel, to a second portion of the signal line that connects a different pair of two adjacent series resonators, a first inductor is connected to one parallel resonator of said two parallel resonators in series, a second inductor is connected to one parallel resonator of said at least one parallel resonator in series, a third inductor is connected to said two parallel resonators and said at least one parallel resonator, the first and third inductors' total inductance is different from the second and third inductor's total inductance.

主权项

1. A filter comprising a plurality of series resonators connected to a signal line in series and a plurality of parallel resonators connected to the signal line in parallel,
wherein two parallel resonators that are adjacent to each other are connected, in parallel, to a first portion of the signal line that connects a pair of two adjacent series resonators among the plurality of series resonators, and at least one parallel resonator is connected, in parallel, to a second portion of the signal line that connects a different pair of two adjacent series resonators, a first inductor is connected to one parallel resonator of said two parallel resonators in series, a second inductor is connected to one parallel resonator of said at least one parallel resonator in series, a third inductor is connected to said two parallel resonators and said at least one parallel resonator, and an inductance of each of said first, second and third inductors is set such that a total inductance of said first and third inductors and a total inductance of said second and third inductors are not equal to each other.