Quad‐Band Bandpass Filter Using Quad‐Mode Stub‐loaded Resonators |
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| Authors: | Haiwen Liu Xiaomei Wang Yan Wang Shen Li Yulong Zhao Xuehui Guan |
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| Institution: | Haiwen Liu (corresponding author, liuhaiwen@gmail.com), Xiaomei Wang (844316217@qq.com), Yan Wang (125903225@qq.com), Shen Li (290253442@qq.com), Yulong Zhao (576358248@qq.com), and Xuehui Guan (249600746@qq.com) are with the College of Information Engineering, East China Jiaotong University, Nanchang, China. |
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| Abstract: | Compact multi‐band bandpass filters using quad‐mode stub‐loaded resonators are proposed in this letter. Firstly, a novel approach about the mode‐splitting characteristics of the quadruple‐mode resonator is investigated, which can provide dual‐band behavior. Secondly, a quad‐band filter is proposed and designed by cascading two quadruple‐mode resonators; the upper one operates at 1.8/2.4 GHz (GSM‐ and WiMax‐band) and the lower one at 1.57/2.1 GHz (GPS‐ and WCDMA‐band). Finally, the proposed filters have been fabricated. Respectable agreement between simulation and measurement verifies the validity of this design methodology. |
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| Keywords: | Quad‐band bandpass filter BPF quad‐mode stub‐loaded resonators |
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