Masters Theses

Keywords and Phrases

Cable harness; Common-mode current; Equivalent source; Prediction; Radiated emissions


"Common-mode current on cable harnesses is often the primary source of radiated emissions below several hundred megahertz. It is difficult, however, to estimate common-mode currents that will occur in a system from component level tests because the common-mode impedances are different in the system. Research presents two methods for using simple component level tests to estimate equivalent common-mode source voltages and source impedances responsible for generating common-mode current. Key to these methods is assuming the harness can be represented with two transmission lines, one terminated with a short and one with an open. Equivalent sources are predicted for those circuits terminated with an open and those terminated with a short. This source information can be used to predict the common-mode currents on harnesses of different lengths or characteristic impedance.

In the first method, source characteristics are found from the magnitude of the common-mode current measured at multiple locations along the harness while varying the component height above the return plane (i.e. by varying the common-mode source impedance). In the second method, a characterization board is used which is connected to the DUT to measure the common-mode source voltages and impedances. Common-mode source measurements are made for groups of pins sorted by known load information, i.e. those pins whose loads are small compared to the characteristic impedance of the transmission line (group 1) and those whose loads are large (group 2)"--Abstract, page iv.


Beetner, Daryl G.

Committee Member(s)

Hwang, Chulsoon
Khilkevich, Victor


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


This paper is based upon work supported in part by the National Science Foundation under Grant No. IIP-1440110.


Missouri University of Science and Technology

Publication Date

Fall 2019

Journal article titles appearing in thesis/dissertation

  • Experimental characterization of the common-mode current sources in a cable harness
  • Rapid measurement-based characterization of common-mode sources in cable harnesses


x, 45 pages

Note about bibliography

Includes bibliographical references.


© 2019 Sameer Sudha Arun Walunj, All rights reserved.

Document Type

Thesis - Open Access

File Type




Thesis Number

T 11654

Electronic OCLC #