| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a resonator device with which a sufficiently large attenuation outside the passband is achieved when the resonator device is used in a filter, and which is reduced in size, filter including the same, and duplexer. <P>SOLUTION: The resonator device S4 includes a plurality of resonators S4a, S4b which are connected in series. An inductor L5 and a capacitor C2 are connected in parallel with the resonator S4a. The resonator S4b has no inductor or capacitor connected in parallel therewith. <P>COPYRIGHT: (C)2010,JPO&INPIT |
