| 摘要 |
A resonator device (1) includes a plurality of resonators (S1a,b;S2a,b,c;S3a,b;S4a,b) which are connected in series. An inductor (L5) and a capacitor (C2) are connected in parallel with at least one (S4b) of the plurality of resonators. At least another one (S4a) of the plurality of resonators has no inductor or capacitor connected in parallel therewith. Therefore, a sufficiently large attenuation outside the passband can be attained when the resonator device is used in a filter. Furthermore, the resonator device can be reduced in size. |
