A bandpass filter using asymmetric stepped‐impedance resonators and symmetric T‐shape interdigital capacitor structures with wide out‐of‐band rejection |
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| Authors: | Dan Wang Bin Wei Yong Heng Bo Li Bisong Cao Xubo Guo Linan Jiang |
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| Affiliation: | 1. State Key Laboratory of Low‐Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, People's Republic of China;2. Beijing Institute of Electronic System Engineering, Beijing, People's Republic of China;3. Department of Electronic Engineering, Tsinghua University, Beijing, People's Republic of China |
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| Abstract: | In this study, a novel stepped impedance resonator (SIR) is proposed. This SIR is composed of two stepped impedance transmission‐lines and an interdigital capacitor structure. The proposed resonator has a high ratio of the first spurious frequency fs to the fundamental frequency f0 and is suitable to design wide stopband filters. An equivalent model is used to analyze the resonant properties of the resonator. The design guidelines of the proposed resonator are summarized. Moreover, the coupling properties of the resonator are simulated and analyzed. Finally, a small high‐temperature superconducting bandpass filter is designed and fabricated using the proposed SIRs. The stopband of the filter is extended up to 4.0 f0 and 3.5 f0 with 30 and 60 dB out‐of‐band rejection levels, respectively. |
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| Keywords: | high‐temperature superconducting interdigital capacitor microwave bandpass filter spurious suppression stepped impedance resonator |
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