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From the same journal

Measured average absorption cross-sections of printed circuit boards from 2 to 20 GHz

Research output: Contribution to journalArticlepeer-review

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Publication details

JournalIEEE Transactions on Electromagnetic Compatibility
DateAccepted/In press - 29 Dec 2015
DateE-pub ahead of print - 19 Jan 2016
DatePublished (current) - Apr 2016
Issue number2
Volume58
Pages (from-to)553-560
Early online date19/01/16
Original languageEnglish

Abstract

The contents of an equipment enclosure, particularly printed circuit boards (PCBs), affect the enclosure’s shielding performance. At high frequencies this absorption can be quantified using the angle of arrival and polarization averaged absorption cross-section (ACS). However, there is no available data on the high-frequency absorption characteristics of modern PCBs. In this study we apply a reverberation chamber to the determination of the average ACS of a large number of printed circuit boards taken from contemporary information and communication technology (ICT) equipment to provide a unique and comprehensive data-set. The ACS was found to range from 4×10-4 –10-2 m2 from 2-20 GHz and different classes of PCB could be identified according to their surface characteristics. The "shadowing effect" of densely packed PCBs was also quantified for a subset of the PCBs. It was found that the ACS of a PCB in the stack was reduced by 20% - 40% compared to its value when isolated. By way of a review of the general power balance analysis of an electrically large populated equipment enclosure in an external environment we show how the acquired data will be useful for future qualification methodologies for ICT enclosures and PCBs.

Bibliographical note

© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. This is an author produced version of a paper published in IEEE Transactions on Electromagnetic Compatibility. Uploaded in accordance with the publisher's self-archiving policy.

    Research areas

  • shielding, printed circuit board, absorption cross-section, reverberation chamber, immunity, emissions, power balance

Research outputs

Activities

Projects

Impacts

  • Improved shielding enclosure qualification methodologies embedded in international standards and used by industry to improve reliability of the communication backbone

    Impact: Technological, Economic

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