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Frequenz

Journal of RF-Engineering and Telecommunications

Editor-in-Chief: Jakoby, Rolf


IMPACT FACTOR 2017: 0.280
5-year IMPACT FACTOR: 0.297

CiteScore 2017: 0.38

SCImago Journal Rank (SJR) 2017: 0.128
Source Normalized Impact per Paper (SNIP) 2017: 0.243

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2191-6349
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Volume 71, Issue 7-8

Issues

High Selectivity Wideband Bandpass Filter Using Stub Loaded Resonator

Xing-Bing Ma
  • Corresponding author
  • Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Tianjin University of Technology and Education, Tianjin 300222, China
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ting Jiang
  • Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2016-10-11 | DOI: https://doi.org/10.1515/freq-2016-0105

Abstract

This article presents a high selectivity wideband bandpass filter (BPF) adopting stub loaded resonator. Hereinto, aim passband is determined by BPF without stub embedded, which is only composed of four half-wavelength open-loop resonators. Based on typical tapped-line coupling, two same stubs are located at physical middle points of two resonators connected with I/O feed lines, respectively. Due to embedded point at middle of loaded resonator, the stub with two open-end branches has no influence on original half-wavelength resonant frequency, and aim passband keeps unchanged. Because of different even-mode resonant frequencies between loaded and unloaded resonators, no new passband is constructed. With the help of embedded stubs, original transmission zero (TZ) near low-edge of aim passband is shifted towards passband, and a new TZ is introduced near high-edge. High selectivity and good passband characteristics are obtained optimizing sizes of stubs, I/O tapped position and top open-end length of loaded resonator.

Keywords: high selectivity; wideband BPF; stub loaded resonator; tapped-line coupling; two open-end branches

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About the article

Received: 2016-04-09

Published Online: 2016-10-11

Published in Print: 2017-07-26


This work was supported by National Nature Science Foundation of China under Grant 61171176 and BUPT Excellent Ph.D. Students Foundation under Grant CX2015203.


Citation Information: Frequenz, Volume 71, Issue 7-8, Pages 329–333, ISSN (Online) 2191-6349, ISSN (Print) 0016-1136, DOI: https://doi.org/10.1515/freq-2016-0105.

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