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On the measureable range of absorption cross-section in a reverberation chamber

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JournalIEEE Transactions on Electromagnetic Compatibility
DateAccepted/In press - 18 Nov 2015
DateE-pub ahead of print - 1 Dec 2015
DatePublished (current) - 1 Feb 2016
Issue number1
Volume58
Number of pages8
Pages (from-to)22-29
Early online date1/12/15
Original languageEnglish

Abstract

Average absorption cross section can be measured in a reverberation chamber with an uncertainty estimated from the number of independent samples of the chamber transfer function taken during the measurement. However, the current uncertainty model does not account the loading effect of the object being measured or the presence of nonstochastic energy in the chamber, as characterized by the Rician K-factor. Here, the uncertainty model for the absorption cross-section measurements has been extended to include both of these effects for the case of stepped mechanical tuning with a paddle and frequency tuning. The extended uncertainty formula has been applied to predict the range over which absorption cross-section measurements can be made with a defined relative uncertainty in a chamber of given geometry, using both simple models for the reverberation chamber and the measured quality-factor and K -factor. The model has been validated using measurements on a set of absorbing cubes of different sizes compared to Mie Series calculation on sphere of equivalent surface area. The extended error model is particularly utile for the design of reverberation chambers and experiments for absorption cross-section measurements across a wide range of application areas.

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© 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. © IEEE 2015. 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

  • absorption cross-section, reverberation chamber, Rician K-factor, uncertainty analysis, uncertainty analysis, reverberation chamber, rician K-factor, Absorption cross section (ACS)

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