Design of a novel compact interdigital bandpass filter using coplanar quarter-wavelength resonators

摘要

In this paper, a novel compact interdigital bandpass filter is proposed using coplanar quarter-wavelength resonators. By using an electromagnetic simulator, the resonant properties, external Q of the resonators, and the coupling coefficient between two resonators are investigated. 4-pole and 10-pole Chebyshev BPFs are designed. After optimization and diagnosis of the filters, the design specifications are satisfied well.