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Volume 71, Issue 7-8


A Compact Quad-Band Bandpass Filter Based on Defected Microstrip Structure

Lei Chen
  • Corresponding author
  • School of Electronic and Information Engineering, Xi’an Technological University, Xi’an, P.R.China, 710032
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/ Xiao Yan Li / Feng Wei
Published Online: 2017-02-03 | DOI: https://doi.org/10.1515/freq-2016-0238


A compact quad-band band-pass filter (BPF) based on stub loaded resonators (SLRs) with defected microstrip structure (DMS) is analyzed and designed in this paper. The proposed resonator is created by embedding DMS into the SLR and can achieve four narrow passbands. By employing the pseudointerdigital coupling structure between the two resonators, transmission zeros among each passband are generated to improve the passband selectivity and a high isolation is achieved. In order to validate its practicability, a prototype of a quad-band BPF centred at 1.57, 2.5, 4.3 and 5.2 GHz is designed and fabricated. The proposed filter is more compact due to the slow-wave characteristic of DMS. The simulated and measured results are in good agreement with each other. In addition, the DMS idea can be extended to the design of other microstrip passive devices.

Keywords: band-pass filter (BPF); quad-band; defected microstrip structure (DMS)


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About the article

Received: 2016-08-15

Published Online: 2017-02-03

Published in Print: 2017-07-26

This work was supported by the National Natural Science Foundation of China (NSFC) under Grant 61301071.

Citation Information: Frequenz, Volume 71, Issue 7-8, Pages 311–316, ISSN (Online) 2191-6349, ISSN (Print) 0016-1136, DOI: https://doi.org/10.1515/freq-2016-0238.

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