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 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 with various configurations.

Meeting Name

IEEE 1997 International Symposium on Electromagnetic Compatibility, 1997


Electrical and Computer Engineering

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

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





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