J4 ›› 2011, Vol. 38 ›› Issue (4): 101-105+123.doi: 10.3969/j.issn.1001-2400.2011.04.018

• 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:2010-06-12 出版日期:2011-08-20 发布日期:2011-09-28
  • 通讯作者: 陈建忠
  • 作者简介:陈建忠(1984-),男,西安电子科技大学博士研究生,E-mail: xjtucjz@gmail.com.
  • 基金资助:


Parameter extraction method for microwave filters based on the curve fitting technique

CHEN Jianzhong;LIANG Changhong;CHEN Jia;LI Qi   

  1. (Science and Technology on Antenna and Microwave Lab., Xidian Univ., Xi'an  710071, China)
  • Received:2010-06-12 Online:2011-08-20 Published:2011-09-28
  • Contact: CHEN Jianzhong



关键词: 曲线拟合, 耦合矩阵, 参数提取, 带通滤波器


The traditional parmeter extraction for microwave filters usually depends on complicated optimization, or it is not suitable for lossy condition. This paper presents a new parameter extraction method for microwave filter design. The phase loading effect is analyzed and removed by using curve fitting technology, and then the unloaded quality factor of lossy microwave resonator is estimated. By making use of the least squares fitting method, admittance parameters of the filter can be extracted according to the EM simulation data, and then the coupling matrix is obtained from these parameters. The proposed approach is used to extract the parameters from EM simulation data of two kinds of microwave filters with a complicated structure. Extracted results aggree well with the simulation.

Key words: curve fitting, coupling matrix, parameter extraction, bandpass filter