DocumentCode :
1225948
Title :
Are shielding properties of the cavity readable in histograms of electric field amplitudes: to scale or not to scale histograms?
Author :
Hämäläinen, J.S.
Author_Institution :
Finnish Defence Forces Tech. Res. Centre, Riihimaki, Finland
Volume :
151
Issue :
6
fYear :
2004
Firstpage :
492
Lastpage :
495
Abstract :
Electric field amplitude histograms are generated in solving Maxwell´s equations inside a rectangular enclosure. The histograms are formed from numerical solutions but they are found to be uncorrelated with attenuation properties i.e. the shielding effectiveness of the enclosure. Modifications to the histograms are introduced and whether the modified histograms are more usable to observe important quantities related to shielding properties than original histograms is explored. A simple rectangular enclosure comprising one aperture is studied as an example. The resonant frequencies are calculated and the shielding effectiveness determined. An input of 290 frequencies is selected and corresponding histograms are obtained, ordered according to square-sum differences between selected reference histogram and histograms under considerations. The reference histograms are aimed to correspond to good shielding such that the ordering would be comparable with shielding properties. Modified histograms are found to correspond better with shielding properties than unmodified histograms.
Keywords :
Maxwell equations; electromagnetic shielding; electromagnetic wave absorption; electromagnetic wave scattering; reverberation chambers; statistical analysis; ANSOFT HFSS simulation software; Maxwell equations; attenuation properties; cavity readable histograms; electric field amplitude histogram; numerical solutions; rectangular enclosure; resonant frequencies; reverberation chambers; selected reference histogram; shielding effectiveness; shielding properties; square-sum differences;
fLanguage :
English
Journal_Title :
Science, Measurement and Technology, IEE Proceedings -
Publisher :
iet
ISSN :
1350-2344
Type :
jour
DOI :
10.1049/ip-smt:20040719
Filename :
1389250
Link To Document :
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