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A Treatment of the Phase Properties of GTEM to Open-Area to
Test-Site Correlation Techniques by L Turnbull and A C Marvin, UK authors
in IEEE Transactions on Electromagnetic Compatibility, Vol 40, No 1,
February 1998
Abstract: The gigahertz transverse electromagnetic (GTEM)
cell is a very attractive environment for the measurement of radiated
emissions from electrically small equipments under test (EUT's). However,
the GTEM is only accepted by the relevant measurement standards as long as
the measurements in a GTEM can be used to predict the field that a
particular EUT would produce on an open-area test site (OATS). Techniques
for predicting equivalent OATS radiated fields from measurements in a GTEM
have been developed. The techniques include the assumption that the dipole
moments, which represent the radiation of an EUT, are all in phase. In
this paper, we analyze the case where the EUT dipole moments are not in
phase and propose a new upper limit for the predicted OATS radiated field.
Our new limit is up to 5 DB greater than the maximum predicted by the
existing techniques, but over most of the frequency range the difference
with the existing technique is about 3 DB.
Index Terms: GTEM cell, OATS, radiated emissions
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