Independently controllable dual‐band microstrip bandpass filter using quadruple‐mode stub‐loaded resonator |
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| Authors: | Haiwen Liu Pin Wen Shuangshuang Zhu Baoping Ren |
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| Affiliation: | School of Information Engineering, East China Jiaotong Universtiy, Nanchang, China |
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| Abstract: | In this article, a quadruple‐mode stub‐loaded resonator (QM‐SLR) is introduced and its four modes are excited using a simple approach, which can provide a dual‐band behavior. By changing the length of the loaded stubs, independently tunable transmission characteristics of the proposed quadruple‐mode stub‐loaded resonator were extensively described for filter design. Moreover, microwave varactors were adopted to represent the length variation of the loaded stubs for the dual‐band tunability. The equivalent circuit modeling of the open stub with microwave varactor was given and discussed. Then, adopting the compact quadruple‐mode stub‐loaded resonator with three varactors, an independently controllable dual‐band bandpass filter (BPF) was designed, analyzed, and fabricated. Its separated bandwidths and transmission zeros can be tuned independently by changing the applying voltage of the microwave varactors. A good agreement between simulated and measured results verified the design methodology. The proposed filter possesses compact size, simple structure, and excellent dual‐band performances. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:602–608, 2016. |
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| Keywords: | bandpass filter (BPF) quadruple‐mode dual‐band independently controllable stub‐loaded resonator |
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