A Study on Influence of Guard Band on Common-Mode Current Related to a Microstrip Line

Yoshiki Kayano
Motoshi Tanaka
James L. Drewniak, Missouri University of Science and Technology
Hiroshi Inoue

This document has been relocated to http://scholarsmine.mst.edu/ele_comeng_facwork/1403

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Influence of guard band on common-mode (CM) current related to a microstrip line (trace) has been studied experimentally and FDTD simulation. As the guard band, copper tape is connected along the entire edge of the ground plane. It is cleared that a guard band parallel to and near a trace is most effective in suppressing the CM current. An empirical formula to quantify the relationship between the position of a trace and CM current of the case with a guard band is proposed. Calculated results using the empirical formula and FDTD modeling are in good agreement, which indicates this empirical formula should be useful for developing EMI design guidelines.