CHEN Jianfeng, CHEN Fuchang, LI Runshuo, XIE Zeming, CHU Qingxin. High Selectivity Cascaded Quadruplet Bandpass Filter with Three Pairs of Transmission Zeros[J]. Chinese Journal of Electronics, 2017, 26(5): 1101-1104. doi: 10.1049/cje.2017.07.017
Citation: CHEN Jianfeng, CHEN Fuchang, LI Runshuo, XIE Zeming, CHU Qingxin. High Selectivity Cascaded Quadruplet Bandpass Filter with Three Pairs of Transmission Zeros[J]. Chinese Journal of Electronics, 2017, 26(5): 1101-1104. doi: 10.1049/cje.2017.07.017

High Selectivity Cascaded Quadruplet Bandpass Filter with Three Pairs of Transmission Zeros

doi: 10.1049/cje.2017.07.017
Funds:  This work is supported by the National Natural Science Foundation of China (No.61571194), the Foundation for Distinguished Young Talents in Higher Education of Guangdong, the Science and Technology Planning Project of Guangdong Province (No.2014A010103013), Natural Science Foundation of Guangdong Province (No.2015A030313203), and the Fundamental Research Funds for the Central Universities (No.2015ZZ093, No.2015ZM066).
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  • Corresponding author: CHEN Fuchang (corresponding a-uthor) was born in 1982, he received the Ph.D. degree in electromagnetic field and microwave technique from South China University of Technology, Guangzhou, China, in 2010. He is currently an associate professor with the School of Electronic and Information Engineering, South China University of Technology. He also works as a visiting scholar at the University of Birmingham, U.K., during 2015. His research interests include the synthesis theory and design of microwave filters and associated RF modules for microwave and millimeter-wave applications. (Email:chenfuchang@scut.edu.cn)
  • Received Date: 2015-07-17
  • Rev Recd Date: 2016-01-04
  • Publish Date: 2017-09-10
  • A novel microstrip Cascaded quadruplet (CQ) bandpass filter using quarter wavelength resonators and three-quarter wavelength resonators is proposed. Based on cross coupling and source-load coupling, three pairs of finite transmission zeros are generated at the stopband. As a result, the out-of-band rejection can be enhanced and high selectivity is achieved. Based on the proposed structure, a cascaded quadruplet filter centering at 3.0GHz is designed and fabricated. Good agreement between the measured and simulated data is obtained.
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