volume | PIER Journals

Abstract

A novel ceramic waveguide filter using coupled slots and two sets of cascade quadruple (CQ) coupling units is presented in this study. Owing to this CQ structure, there are two pairs of transmission zeros at the edge of the passband to ensure that the filter has good selectivity. First, the effect of cavity dimensions on the resonant frequencies of the intrinsic modes was analyzed. Next, the impact of the coupling structure on the coupling bandwidth and the characteristics of the electric-field distribution was explored, followed by an examination of the relationship between the feeding structure and the quality factor (Qe). Finally, a prototype filter centered at 3.5 GHz with a bandwidth of 200 MHz was designed and fabricated. The insertion loss within the passband was less than 1.9 dB, and the return loss was greater than 20 dB. The out-of-band suppression exceeds 42 dB in the 3.3-3.36 GHz and 3.64-3.7 GHz, and even exceeds 70 dB in the 3.2-3.3 GHz and 3.7-3.8 GHz.

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Professor Yunxiu Wang

Dr. Wei Chao Yang

Dr. Yang Gao

Dr. Jianni Zhang

Dr. Ling Tang