EMI through perforation patterns for airflow in shielding enclosures resulting from coupling of interior sources is investigated numerically with FDTD simulations and experimentally. The FDTD simulations are compared with measurements on perforation patterns. A simple empirical design approach for the relation between aperture size, the number of apertures and shielding effectiveness is extracted. A double perforation pattern structure is proposed for perforation pattern designs where a high percentage of open area is required. Frequencies where the enclosure will support cavity modes are of primary concern.

Meeting Name

IEEE International Symposium on Electromagnetic Compatibility (1998: Aug. 24-28, Denver, CO)


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Keywords and Phrases

EMI; FDTD Simulations; Airflow Aperture Arrays Design; Aperture Size; Cavity Modes; Double Perforation Pattern Structure; Electromagnetic Interference; Electromagnetic Shielding; Finite Difference Time-Domain Analysis; Interior Sources Coupling; Open Area; Perforation Pattern Measurements; Perforation Patterns; Shielding Enclosures; Computer Simulation; Electric Shielding; Enclosures; Frequency Domain Analysis; Numerical Analysis; Airflow Aperture Arrays; Electromagnetic Compatibility

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 1998 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Aug 1998