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 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.

[1]  Thomas M. Antonsen,et al.  Random Coupling Model for interconnected wireless environments , 2014, 2014 IEEE International Symposium on Electromagnetic Compatibility (EMC).

[2]  David A. Hill,et al.  Electromagnetic Fields in Cavities , 2009 .

[3]  Christopher L. Holloway,et al.  Absorption characteristics and SAR of a lossy sphere inside a reverberation chamber , 2014, 2014 International Symposium on Electromagnetic Compatibility.

[4]  M. Migliaccio,et al.  Use of Nested Reverberating Chambers to Measure Shielding Effectiveness of Nonreciprocal Samples Taking Into Account Multiple Interactions , 2008, IEEE Transactions on Electromagnetic Compatibility.

[5]  H. A. Shah,et al.  Reverberation Chamber Techniques for Determining the Radiation and Total Efficiency of Antennas , 2012, IEEE Transactions on Antennas and Propagation.

[6]  A.C. Marvin,et al.  Use of Reverberation Chambers to Determine the Shielding Effectiveness of Physically Small, Electrically Large Enclosures and Cavities , 2008, IEEE Transactions on Electromagnetic Compatibility.

[7]  D. Hill,et al.  Aperture Excitation of Electrically Large, Lossy Cavities , 1993 .

[8]  Raj Mittra,et al.  Electromagnetic Penetration Through Apertures in Conducting Surfaces , 1978, IEEE Transactions on Electromagnetic Compatibility.

[9]  Magnus Hoijer,et al.  Field Statistics in Nested Reverberation Chambers , 2013, IEEE Transactions on Electromagnetic Compatibility.

[10]  C. Orlenius,et al.  Calculated and measured absorption cross sections of lossy objects in reverberation chamber , 2004, IEEE Transactions on Electromagnetic Compatibility.

[11]  Maurizio Migliaccio,et al.  Analysis of the Measurement Uncertainty of the Absorption Cross Section in a Reverberation Chamber , 2015, IEEE Transactions on Electromagnetic Compatibility.

[12]  David A. Hill,et al.  Electromagnetic fields in cavities: Deterministic and statistical theories [Advertisement] , 2009 .

[13]  Angelo Gifuni,et al.  Relation Between the Shielding Effectiveness of an Electrically Large Enclosure and the Wall Material Under Uniform and Isotropic Field Conditions , 2013, IEEE Transactions on Electromagnetic Compatibility.

[14]  J. Salo,et al.  The distribution of the product of independent Rayleigh random variables , 2006 .

[15]  Simon J. Bale,et al.  On the Measurable Range of Absorption Cross Section in a Reverberation Chamber , 2016, IEEE Transactions on Electromagnetic Compatibility.

[16]  G. Latmiral,et al.  Performance and Analysis of a Reverberating Enclosure with Variable Geometry , 1980, IEEE Transactions on Electromagnetic Compatibility.

[17]  Franco Moglie,et al.  Absorbing cross section in reverberation chamber: experimental and numerical results , 2012 .

[18]  Angelo Gifuni,et al.  Effects of the Correction for Impedance Mismatch on the Measurement Uncertainty in a Reverberation Chamber , 2015, IEEE Transactions on Electromagnetic Compatibility.

[19]  D. Blumenfeld.  Operations Research Calculations Handbook , 2001 .

[20]  Gilda Schirinzi,et al.  Performance of the Reflectivity Measurement in a Reverberation Chamber , 2015 .

[21]  P. Hallbjorner,et al.  Extracting electrical material parameters of electrically large dielectric objects from reverberation chamber measurements of absorption cross section , 2005, IEEE Transactions on Electromagnetic Compatibility.

[22]  C.L. Holloway,et al.  Requirements for an effective reverberation chamber: unloaded or loaded , 2006, IEEE Transactions on Electromagnetic Compatibility.

[23]  G. Latmiral,et al.  Use of a Reverberating Enclosure for Measurements of Radiated Power in the Microwave Range , 1976, IEEE Transactions on Electromagnetic Compatibility.

[24]  Philippe Besnier,et al.  Experimental validation of the Statistical Energy Analysis for coupled reverberant rooms , 2015, 2015 IEEE International Symposium on Electromagnetic Compatibility (EMC).

[25]  Andy Marvin,et al.  Rapid and accurate broadband absorption cross-section measurement of human bodies in a reverberation chamber , 2015 .

[26]  Xiaoming Chen,et al.  Measurement Uncertainty of Antenna Efficiency in a Reverberation Chamber , 2013, IEEE Transactions on Electromagnetic Compatibility.

[27]  A. Gifuni.  On the Measurement of the Absorption Cross Section and Material Reflectivity in a Reverberation Chamber , 2009, IEEE Transactions on Electromagnetic Compatibility.