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DTIC AD0921325: Advanced Measurement Techniques Within Shielded Enc...
by Defense Technical Information Center
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This report summarizes the results of an experimental
program to develop measurement techniques for obtaining
accurate radiated interference data on electronic and
electrical equipment when tested within the confines of
shielded enclosures. Specific objectives were to
investigate various observations, conclusions and
recommendations evolving from prior work in this area.
Although the initial measurements were made in a full
size enclosure most of the experiments were performed
using frequency scaled cavities at frequencies up to and
including the first resonant frequency. With linear
source and receive antennas, the severe E Field null
observed by other investigators appeared at frequencies
somewhat above fco/2 for the dominant waveguide mode. As
noted by Mendz (IBM), the null moves toward the source as
the frequency is increased. In addition, the location of
the null relative to the source is a function of the
enclosure geometry, the location of the source and the
length of both the source and receive antennas. However,
when either monopole was replaced by a loop the null did
not appear. Also, the null was not observed with the
monopole source antenna located on the bottom wall and a
monopole receive antenna probing along the top wall.
Regardless of the antenna configuration, the standing
wave at the first resonant frequency is a problem.
Reasonable success in reducing the amplitude was realized
by loading the cavities with lossy, vane attenuators.
Date Published: 2019-12-11 18:00:43
Identifier: DTIC_AD0921325
Item Size: 36648569
Language: english
Media Type: texts
# Topics
DTIC Archive; McKenzie, Robert L ; AR...
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