| 摘要 |
A filter and a duplexer are provided to achieve a high degree of suppression in a stop band by reducing mutual inductance between a first line and a second line. A first filter(10) is connected to a common terminal and a first terminal(T1), and has a first series-arm resonator. A second filter(20) is connected to the common terminal and a second terminal(T2). A first inductor(30) is connected in parallel to the first series-arm resonator. The first filter and the second filter are mounted on a mounting part. A first inductor line(L12) is provided on the mounting part to connect the first inductor with the first series-arm resonator. A first terminal line(L13) is provided on the mounting part to connect the first filter with the first terminal.
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