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General Information
    • ISSN: 2010-3719 (Online)
    • Abbreviated Title: Int. J. Inf. Electron. Eng.
    • Frequency: Quarterly
    • DOI: 10.18178/IJIEE
    • Editor-in-Chief: Prof. Chandratilak De Silva Liyanage
    • Executive Editor: Jennifer Zeng
    • Abstracting/ Indexing : Google Scholar, Electronic Journals Library, Crossref and ProQuest,  INSPEC (IET), EBSCO.
    • E-mail ijiee@ejournal.net
Editor-in-chief

 
University of Brunei Darussalam, Brunei Darussalam   
" It is a great honor to serve as the editor-in-chief of IJIEE. I'll work together with the editorial team. Hopefully, The value of IJIEE will be well recognized among the readers in the related field."

IJIEE 2020 Vol.10(2): 28-34 ISSN: 2010-3719
DOI: 10.18178/IJIEE.2020.10.2.716

Multi-order Miniaturized Dual Transmission Zeros HTS Filter without Cross Coupling

Liguo Zhou, Yanshuang Han, Hang Wu, Zhihe Long, Hui Li, and Tianliang Zhang
Abstract—A Miniaturized high temperature superconducting filter applied to mobile communication is designed based on a novel double-folded microstrip hairpin resonator which can be used to adjust the intensity of electromagnetic coupling. The filter has the characteristics of small size and a pair of transmission zeros to improve out-of-band suppression without cross coupling. According to the theory of complex electromagnetic coupling, the circuit structure of the double folded microstrip hairpin resonator is analyzed. By adjusting the lengths of different circuit parts of the microstrip resonator, the exchange of electromagnetic coupling characteristics can be realized, thus introducing transmission zeros. At the same time, the mutual cancellation of electromagnetic coupling can reduce the distance between resonators, so the overall size of the filter is reduced. A double transmission zeros miniaturized microstrip HTS 11-order filter with the center frequency of 1300MHz and bandwidth of 200MHz without cross-coupling is designed. The measured indexes of the filter at 77 K: the center frequency is 1300 MHz, 3 dB relative bandwidth is 15%, in-band insertion loss is less than 0.25 dB, the size is 24.81 mm  11.60 mm (0.26λgc  0.12λgc), and out-of-band rejection is more than 70dB. The overall size test results are consistent with the simulation results.

Index Terms—High temperature superconductivity (HTS), filter, transmission zeros, cross coupling.

Liguo Zhou, Yanshuang Han, Hang Wu, Hui Li and Tianliang Zhang are with the School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 611731, China
Zhihe Long is the Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China (e-mail: zhouliguo0710@163.com).

[PDF]

Cite: Liguo Zhou, Yanshuang Han, Hang Wu, Zhihe Long, Hui Li, and Tianliang Zhang, "Multi-order Miniaturized Dual Transmission Zeros HTS Filter without Cross Coupling," International Journal of Information and Electronics Engineering vol. 10, no. 2, pp. 28-34, 2020.

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