Innovative applications of TEM cell measurements in predicting radiated emissions due to common-mode current on printed circuit boards

Author

Shaowei Deng

Abstract

"Signal voltages and currents in integrated circuits (ICs) and on printed circuit board (PCB) traces produce electric and magnetic fields that can induce common-mode currents on larger radiating structures. In the first part of this dissertation, a TEM cell measurement method employing a hybrid to separate the electric field coupling and the magnetic field coupling is described. The results of this measurement can be used to determine an effective source voltage and capacitance that characterize an IC's or PCB's ability to drive common mode currents onto cables or enclosures due to electric-field coupling. This information can then be used to estimate the resulting radiated emissions.

In the second part, a closed-form equation is developed to estimate the maximum radiated fields from a voltage source driving a board relative to an attached cable over a ground plane. This equation is evaluated for various cable and board geometries by comparing the estimates to full wave simulations. The maximum radiation calculated using the closed-form expression generally predicts the peak full wave simulation results within a few dB for various board sizes and cable lengths.

The third part describes a technique for using TEM cell measurement results to quantify the ability of boards to drive common-mode currents on cables due to magnetic field coupling. The maximum radiated emissions due to magnetic field coupling can then be estimated accordingly"--Abstract, page iv.

Advisor(s)

Beetner, Daryl G.
Hubing, Todd H.

Committee Member(s)

DuBroff, Richard E.
Pommerenke, David
Hale, Barbara N.
Drewniak, James L.

Department(s)

Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering

Publisher

University of Missouri--Rolla

Publication Date

Fall 2007

Journal article titles appearing in thesis/dissertation

• Characterizing the electric-field coupling from IC-heatsink structures to external cables using TEM-cell measurements
• Estimating maximum radiated emissions from printed circuit boards with an attached cable
• Using TEM cell measurements to estimate the maximum radiation from PCBs with attached cables due to magnetic field coupling

Pagination

x, 60 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2007 Shaowei Deng, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Subject Headings

Electromagnetic interferenceElectronic circuit designPrinted circuits -- Design and constructionRadiation -- Measurement

Thesis Number

T 9322

Print OCLC #

272405030

Electronic OCLC #

905651045

Recommended Citation

Deng, Shaowei, "Innovative applications of TEM cell measurements in predicting radiated emissions due to common-mode current on printed circuit boards" (2007). Doctoral Dissertations. 1761.
https://scholarsmine.mst.edu/doctoral_dissertations/1761