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Analysis and design of compact wide bandpass filter with ultra-wide stopband using multi-stub loaded resonator

Published online by Cambridge University Press:  15 January 2016


Di Lu
Affiliation:
School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC), Qingshuihe Campus: No. 2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu, Sichuan, China Charles L. Brown Department of Electrical and Computer Engineering, University of Virginia, 351 McCormick Road, Charlottesville, Virginia, USA
Xiao-Hong Tang
Affiliation:
School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC), Qingshuihe Campus: No. 2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu, Sichuan, China
Corresponding

Abstract

A compact microstrip multi-stub loaded bandpass filter (BPF) with ultra-wide stopband is introduced and investigated. Lumped-equivalent circuit (LEC) method is adopted to analyze the characteristics of the in-band response based upon the low frequency LEC and even-odd mode analytical method. Besides, equivalent transmission line circuit method with even-odd mode analytical method are adopted to discuss the mechanism of the out-band rejection based upon the transmission poles and the transmission zeros analysis of the even-/odd-mode equivalent circuits. Accordingly, the design and the optimization procedures of this type of filters are summarized. To experimentally validate the proposed method, the filter is fabricated and measured. The measured results illustrate this BPF centered at f 0 = 2.8 GHz, with −3 dB fractional bandwidth of 109.3%, the insert loss (IL) of less than 1 dB from 1.4 to 4 GHz, and the rejection level of 20 dB from 5.1 to 33.5 GHz (1.82f 0 to 11.96f 0 ).


Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

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Analysis and design of compact wide bandpass filter with ultra-wide stopband using multi-stub loaded resonator
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