Summary

International Symposium on Electromagnetic Compatibility

2009

Session Number:21R2

Session:

Number:21R2-2

A Proposal for an Efficient EMI Measurement Method in a Fully Anechoic Room

K. Masuda,  

pp.113-116

Publication Date:2009/7/20

Online ISSN:2188-5079

DOI:10.34385/proc.14.21R2-2

PDF download (219.3KB)

Summary:
In a Fully Anechoic Room (FAR), height pattern variation rarely occurs since there are no reflected waves from the floor. Since the height of an antenna does not need to be changed to obtain an accurate peak value, measurement time can be drastically reduced. However, if the directivity of a noise source is very sharp, there is a concern that an accurate peak value may not be obtained when using a fixed-height antenna. In this report, we investigated how to change an antenna height in an FAR. We calculated the narrowest radiated-wave directivity based on EUT size and investigated the optimal step increment for changing the antenna height using the narrowest directivity. As a result, we verified that the difference between measurement results using our proposed and conventional method was within about ± 3 dB. This allowed us to shorten the measurement time to 22 % of that needed for the conventional method.