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Quasi‐TEM approach of coupled‐microstrip lines and its application to the analysis of microstrip filters
Author(s) -
Xiao Fei,
Norgren Martin,
He Sailing
Publication year - 2012
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20592
Subject(s) - microstrip , microwave , resonator , inductance , capacitance , admittance parameters , topology (electrical circuits) , electric power transmission , admittance , electronic engineering , physics , electrical impedance , materials science , electrical engineering , voltage , computer science , optoelectronics , engineering , telecommunications , electrode , quantum mechanics
In this article, the quasi‐TEM approach is successfully used to analyze coupled‐microstrip lines of finite length, which are usually used for the coupling between the source/load and resonators in microstrip filters. First, an orthogonal expansion method is used to extract the per‐length inductance and capacitance matrices. The authors then obtain the impedance matrix or admittance matrix, which relates the voltages and currents at both ends of coupled‐microstrip lines. To verify our theory, an example is presented, i.e., a Y‐shaped dual‐mode bandpass microstrip filter, for which, the equivalent circuit model based on the quasi‐TEM analysis of coupled‐microstrip lines is accurately set up. The approach in this article is applicable to planar microstrip lines with arbitrary number of conductors, under the quasi‐TEM assumption. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2012.