Direct Conversion from Two-Port S-parameters to Coupled-Line Impedances

Jongheun Lee, Juseop Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper illustrates a straightforward method to diagnose the even- and odd-mode impedances of a pair of coupled lines without driving them with common- and differential-mode excitations (four-port measurements). It will be shown that two consecutive two-port measurements of coupled lines are sufficient to fully determine the modal impedances, supported by equations that link the two-port measurement results and the impedances.

Original languageEnglish
Title of host publication2022 Asia-Pacific Microwave Conference, APMC 2022 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9784902339567
Publication statusPublished - 2022
Event2022 Asia-Pacific Microwave Conference, APMC 2022 - Yokohama, Japan
Duration: 2022 Nov 292022 Dec 2

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference2022 Asia-Pacific Microwave Conference, APMC 2022

Bibliographical note

Funding Information:
ACKNOWLEDGMENT This work was supported by the National Research Foundation of Korea (NRF) through the Korea Government (MSIT) under Grant No. 2022R1A2B5B01001340.

Publisher Copyright:
© 2022 The Institute of Electronics Information and Communication Engineers (IEICE) of Japan.


  • Coupled lines

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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