Compact dual‐ and triband bandpass filter using frequency selecting coupling structure loaded stepped‐impedance resonator |
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| Authors: | Jin Xu Jin‐Dong Zhang |
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| Affiliation: | 1. School of Electronics and Information, Northwestern Polytechnical University, Xi'an, People's Republic of China;2. Ministerial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing, People's Republic of China |
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| Abstract: | This article presents two novel resonators, that is, frequency selecting coupling structure loaded stepped‐impedance resonator (FSCSLSIR) and π‐section loaded FSCSLSIR. The resonator behaviors and guidelines are given to design FSCSLSIR dual‐band bandpass filter (BPF) and π‐section loaded FSCSLSIR triband BPF. The proposed dual‐ and triband BPF have very compact sizes of 0.13 λgd × 0.06 λgd and 0.115 λgt × 0.074 λgt, respectively. Moreover, good return loss, low insertion loss, and high band‐to‐band isolation can be observed, and the proposed FSCSLSIR dual‐band BPF has an ultrawide stopband from 5.79 to 36 GHz. The experimental results are in good agreement with the simulations. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:427–435, 2015. |
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| Keywords: | stepped impedance resonator bandpass filter dual‐band triband |
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