EMI filters are often utilized on I/O lines to reduce high-frequency noise from being conducted or coupled off the PCB and resulting in an EMI problem. However, layout parasitics are usually inevitable in practical circuit design, and the filtering performance may vary. In this study, the impact of the board layout on the filtering performance is investigated by |S 21 | measurements of sample PCB boards with different filter layouts. The finite-difference time-domain method is applied to model the boards, support the experimental work, and can be used to provide a means for conducting "what-if" engineering studies.

Meeting Name

2001 IEEE International Symposium on Electromagnetic Compatibility, 2001


Electrical and Computer Engineering

Keywords and Phrases

"What-If" Engineering Studies; EMC; EMI; EMI Filters; I/O Lines EMI Filtering; PCB Layout Parasitics; Electromagnetic Compatibility; Electromagnetic Interference; Filtering Performance; Filters; Finite Difference Time-Domain Analysis; Finite-Difference Time-Domain Method; High-Frequency Noise Filtering; Printed Circuit Layout; Printed Circuits; S 21 -- Measurements

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2001 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

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