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Bandpass Filter with Wide Stopband Using Composite Right/Left Handed Transmission Line

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Abstract

Abstract This paper presents a wide-stopband bandpass filter (BPF) based on mixed coupling of the composite right/left handed transmission line (CRLH-TL). First the CRLH-TL resonator is introduced and analyzed. Then mixed coupling (Both electric coupling path and magnetic coupling path exist) of the novel resonator is explained. Based on the structural features of the CRLH-TL resonators, this coupling path can generate an additional transmission zero near passband without increasing the overall size of the filter. Then, good selectivity of the proposed BPF can be obtained. Meanwhile, in order to get a wide stopband, two open stubs are employed to suppress harmonic response of the CRLH-TL resonator. The filter is developed and analyzed based on microwave network theory and equivalent circuit method. The proposed BPF has been designed, fabricated, and measured. The measured results agree with the predicted ones closely.

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Acknowledgments

The work for this grant was supported by National Natural Science Foundation of China (Grant No: 61271026), by National Natural Science Foundation of China-NSAF (Grant No: 10976005), by the Program for New Century Excellent Talents in University (Grant No: NCET-11-0066), and by the Research Fund of Shanghai Academy of Spaceflight Technology (SAST201243).

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Authors and Affiliations

  1. EHF Key Laboratory of Fundamental Science, School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, People’s Republic of China

    Yuxia Mo, Kaijun Song, Tao Pan & Yong Fan

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  1. Yuxia Mo
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  2. Kaijun Song
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Correspondence to Kaijun Song.

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Mo, Y., Song, K., Pan, T. et al. Bandpass Filter with Wide Stopband Using Composite Right/Left Handed Transmission Line. Wireless Pers Commun 72, 811–822 (2013). https://doi.org/10.1007/s11277-013-1043-x

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