| 摘要 |
A plurality of one-quarter wavelength coplanar resonators 5 a to 5 d are formed in series on a dielectric substrate 1 , and coplanar input/output terminal sections 4 a and 4 b are formed on the dielectric substrate at opposite ends of the series connection for coupling with resonators 5 a and 5 d, respectively. A center conductor line width w<SUB>1 </SUB>of each of the resonators 5 a to 5 d is equal to a center conductor line width w<SUB>io </SUB>of each of the input/output terminal section 4 a and 4 b, but a ground conductor spacing d<SUB>1 </SUB>of each of the resonators 5 a to 5 d is greater than a ground conductor spacing d<SUB>io </SUB>of each of input/output terminal section 4 a and 4 b. Maintaining the accuracy of design is facilitated and a reduction in the maximum current density in the resonator is enabled.
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