A Theory of Alternative Methods for Measurements of Absorption Cross Section and Antenna Radiation Efficiency Using Nested and Contiguous Reverberation Chambers

Average ACS can be measured in a reverberation chamber; however, the existing technique determines a value that includes the effects of the radiation efficiencies of the antennas used in the measurement. Correcting for these necessitates further complex measurements. Here, we present the theory of a...

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Bibliographic Details
Published in:IEEE transactions on electromagnetic compatibility 2016-06, Vol.58 (3), p.678-685
Main Authors: Gifuni, Angelo, Flintoft, Ian D., Bale, Simon J., Melia, Gregory C. R., Marvin, Andrew C.
Format: Article
Language:English
Subjects:
Absorption cross sections
Antenna measurements
antenna radiation efficiency
Antennas
Biomedical measurement
Calibration
Chambers
Cross sections
Current measurement
Electromagnetic compatibility
Integrated circuits
Measurement uncertainty
Metal plates
Receiving antennas
Reverberation chambers
reverberation chambers (RCs)
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Summary:Average ACS can be measured in a reverberation chamber; however, the existing technique determines a value that includes the effects of the radiation efficiencies of the antennas used in the measurement. Correcting for these necessitates further complex measurements. Here, we present the theory of an alternative measurement methodology using two nested or contiguous reverberation chambers which is free from errors caused by the radiation efficiencies of the antennas. The new method is based on the theoretical average transmission cross sections (TCS) of circular holes in a metal plate between the two chambers. In fact, the method can be viewed as an accurate transfer calibration measurement between TCS and ACS that is independent of both the chamber and antenna characteristics. Further, since the existing method of measuring ACS includes the effects of the radiation efficiencies of the antennas, a comparison of the ACS of a reference object, measured using both the existing and new methods, also provides an alternative method of determining radiation antenna efficiency. Measurement uncertainties for both alternative measurement methods-ACS and antenna radiation efficiency-are also derived.
ISSN:0018-9375
1558-187X
DOI:10.1109/TEMC.2016.2548939