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Quasi-TEM approach of coupled-microstrip lines and its application to the analysis of microstrip filters

✍ Scribed by Fei Xiao; Martin Norgren; Sailing He

Publisher: John Wiley and Sons
Year: 2011
Tongue: English
Weight: 376 KB
Volume: 22
Category: Article
ISSN: 1096-4290
DOI: 10.1002/mmce.20592

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✦ Synopsis

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. V

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