FILTER AND ANTENNA DUPLEXER

摘要

A filter and an antenna duplexer are provided to implement miniaturization and to enhance the degree of freedom in designing. In a filter and an antenna duplexer, a first resonator is provided. An excitation efficiency of a second resonator(S31) is reduced than the first resonator. An inductor(L31) is connected to the second resonator in parallel. The first and second resonators are a surface acoustic wave resonator. And, the first and second resonators are a piezoelectric thin film resonator.