To provide a strip line filter which strengthens a degree of coupling between a desired pair of resonators to widen a pass band without depending on a gap between resonators or on a setting of shape of each resonant line.
The strip line filter 1 has resonant lines 11A to 11E, a ground electrode 31, and input and output electrodes 32A and 32B. The resonant lines 11A to 11E are opposed to a mounting surface via a dielectric substrate 2 having a rectangular plate shape. A ground electrode 31 is provided on the mounting surface, and configures a plurality of resonators together with the resonant lines 11A to 11E. The input and output electrodes 32A and 32B are provided on the mounting surface and coupled to any one of the resonators. Electrode non-forming parts 33A and 33B are provided on the mounting surface. The electrode non-forming part 33A passes through: a region of the mounting surface to which the resonant line 11B is opposed; and a region of the mounting surface to which the resonant line 11C is opposed. The electrode non-forming part 33A is adjacent only to the ground electrode 31 in the regions.
HIROSHIMA MOTOHARU
NAKAMURA SOICHI
| JP2004023567A | 2004-01-22 | |||
| JPH07263915A | 1995-10-13 | |||
| JPH03129895A | 1991-06-03 | |||
| JPS6441503A | 1989-02-13 |