Influence of guard band on common-mode (CM) current related to a microstrip line (trace) has been studied experimental 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.

Meeting Name

IEEE International Symposium on Electromagnetic Compatibility (2003: May 11-16, Istanbul, Turkey)


Electrical and Computer Engineering

Keywords and Phrases

Cu; EMI Design; FDTD Simulation; Common-Mode Current Suppression; Copper; Copper Tape Connection; Electric Current Measurement; Electromagnetic Interference; Empirical Formula; Finite Difference Time-Domain Analysis; Ground Plane Connection; Guard Band; Microstrip Line; Microstrip Lines; Printed Circuit Layout; Trace Position; Common-Mode Current; FDTD Method; Printed Circuit Board

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2003 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 May 2003