EMI can often be reduced by selectively filtering various parts of a given system. One common method employed by designers is to split the groundplane near the chassis and route I/O lines over the split. The rationale is based on providing a large series impedance to common-mode currents on the I/O lines. In this manner, PCB designers hope to lower the level of noise currents contributing to radiation. This work studies the efficacy of the groundplane split as a deterrent for EMI associated with I/O lines being driven against other extended reference structures. A test-board was developed to analyze the impedance of the groundplane split with various configurations.

Meeting Name

IEEE International Symposium on Electromagnetic Compatibility (1997: Aug. 18-22, Austin, TX)


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Keywords and Phrases

EMI Control; I/O Lines Routing; PCB Designers; Common-Mode; Connector; Electric Connectors; Electric Impedance; Electromagnetic Compatibility; Electromagnetic Interference; Extended Reference Structures; Groundplane Split Efficiency; Noise Currents Reduction; Printed Circuit Design; Printed Circuit Testing; Selective Filtering; Series Impedance; Split Groundplanes; Test-Board; Electric Connectors; Electric Currents; Electric Grounding; Printed Circuit Boards; Electromagnetic Wave Interference

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 1997 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Aug 1997