J4 ›› 2014, Vol. 41 ›› Issue (1): 53-56.doi: 10.3969/j.issn.1001-2400.2014.01.010

• 研究论文 • 上一篇    下一篇



  1. (西安电子科技大学 天线与微波技术重点实验室,陕西 西安  710071)
  • 收稿日期:2012-10-20 出版日期:2014-02-20 发布日期:2014-04-02
  • 通讯作者: 孙守家
  • 作者简介:孙守家(1987-),男,西安电子科技大学博士研究生,E-mail: sunshoujia@gamil.com.
  • 基金资助:

    国家高技术研究发展计划(863计划)资助项目(2012AA01A308);国家自然科学基金资助项目(60901031, 61271017)

Novel dual-mode square loop microstrip bandpass filter

SUN Shoujia;WU Bian;LIANG Changhong   

  1. (Science and Technology on Antenna and Microwave Lab., Xidian Univ., Xi'an  710071, China)
  • Received:2012-10-20 Online:2014-02-20 Published:2014-04-02
  • Contact: SUN Shoujia



关键词: 双模谐振器, 带通滤波器, 源和负载耦合


This paper presents a novel dual-mode square loop resonator with a compact size. Firstly, the odd-even-mode method is utilized to analyze the resonant property of the proposed resonator since its structure is symmetrical, and the passband center frequency can be easily tuned by changing the lengths of a pair of loaded open-ended stubs. Secondly, source-load coupling is introduced to produce a new transmission zero and improve the passband selectivity. Finally, a microstrip dual-mode bandpass filter (BPF) centering at 1.95GHz with a 3dB fractional bandwidth (FBW) of 37.7% is designed and fabricated. The measured and simulated results in good agreement are presented.

Key words: dual-mode resonator, bandpass filter, source-load coupling