Anechoic Chambers for EMI Test

Yasutaka SHIMIZU  

Publication
IEICE TRANSACTIONS on Communications   Vol.E75-B   No.3   pp.101-106
Publication Date: 1992/03/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Issue on Measurements and Control of Electromagnetic Interference)
Category: 
Keyword: 
anechoic chamber,  R.F. absorbing material,  electromagnetic compatibility (EMC),  Electromagnetic interference (EMI),  Immunity test,  

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Summary: 
Anechoic chambers have been effectively used for microwave propagation, electromagnetic interference (EMI) and immunity testing. The electromagnetic compatibility (EMC) problem has recently become serious and many of these chambers have been constructed. The results of a questionnaire survey sent to anechoic chamber manufacturers are described that a total of 450 anechoic chambers have been constructed in Japan since 1964. Twenty years ago the purpose of the chambers was microwave propagation research, but more than 50 each year have recently being built for EMC/EMI and immunity testing. Their size has gradually been reduced by the use of absorbing materials such as ferrite with dielectric materials. The lowest frequency of most chambers is 30MHz for the 3 m method of site attenuation.