[SI-LIST] : Shielding Effectiveness - or when a dB is not a dB

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From: Douglas C. Smith (doug@dsmith.org)
Date: Mon Jul 31 2000 - 20:53:52 PDT


Hi All,

Shielding effectiveness is normally measured using plane
waves (relatively far from the source). This method of
measurement for shielding effectivenes does not always
correspond to the way a shielding material is used. It is
especially true when shielding material is incorporated
into small products, such as the new wave of wireless
devices on the market. If you rely on shielding to keep
different parts of a product from interfering with each
other, correlation of specification to use is especially
important.

The August 2000 Technical Tidbit on http://www.dsmith.org
(or http://emcesd.com) describes a simple method of
shielding effectiveness measurement that can be easily done
in the development laboratory. This measurement method can
give a better measure of shielding effectiveness that
industry standard measurement techniques when the shield is
close to the source being shielded.

Has anyone here who is into shielding used something like
this method which uses magnetic field loops?

Doug

-- 
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    ___          _           Doug Smith
     \          / )          P.O. Box 1457
      =========              Los Gatos, CA 95031-1457
   _ / \     / \ _           TEL/FAX: 408-356-4186/358-3799
 /  /\  \ ] /  /\  \         Mobile:  408-858-4528
|  q-----( )  |  o  |        Email:   doug@dsmith.org
 \ _ /    ]    \ _ /         Website: http://www.dsmith.org
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