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Dual-wideband bandpass filter with independently controllable center frequencies and wide stopband

Published online by Cambridge University Press:  20 November 2017

Yang Xiong
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China. Phone: (+86)022-23508412
Litian Wang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China. Phone: (+86)022-23508412
Doudou Pang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China. Phone: (+86)022-23508412
Wei Zhang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China. Phone: (+86)022-23508412
Fan Zhang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China. Phone: (+86)022-23508412
Ming He
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China. Phone: (+86)022-23508412 Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Nankai University, Tianjin 300350, China
Xinjie Zhao
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China. Phone: (+86)022-23508412
Xu Zhang*
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China. Phone: (+86)022-23508412
*
Corresponding author: X. Zhang Email: nkzhangxu@nankai.edu.cn

Abstract

In this paper, a dual-wideband bandpass filter (BPF) with independently controllable center frequencies (CFs) and wide stopband suppression is presented using a new quintuple-mode resonator (QMR). By applying the classical odd-/even-mode analysis method, the resonant characteristics of the new QMR have been analyzed. It shows that five modes can be excited, and two of them can be employed to form the lower passband, while the other three modes contribute to the higher passband. For verification, a dual-wideband BPF using the new QMR is designed, fabricated, and tested. Experimental results show that the CFs of the dual-wideband BPF centered at 2.96 GHz and 5.695 GHz with 3 dB fractional bandwidths of 27.7 and 23.4%, respectively. In addition, 20-dB suppression in upper-stopband ranges from 2.23 to 4.04f0, where f0 is the center frequency of the first passband. The measurement results are in good agreement with the prediction results.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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