Broadband Measurement of Absorption Cross Section of the Human Body in a Reverberation Chamber

We present broadband reverberation chamber measurements of the absorption cross section (ACS) of the human body averaged over all directions of incidence and angles of polarization. This frequency-dependent parameter characterizes the interactions between the body and the enclosures of reverberant environments such as aircraft cabins, and is, therefore, important for the determination of the overall Q-factor and, hence, the field strength illuminating equipment inside such enclosures. It also correlates directly with the electromagnetic exposure of occupants of reverberant environments. The average ACS of nine subjects was measured at frequencies over the range 1-8.5 GHz. For a 75-kg male, the ACS varied between 0.18 and 0.45 square meters over this range. ACS also correlated with body surface area for the subjects tested. The results agree well with computational electromagnetic simulations, but are obtained much more rapidly. We have used the obtained values of ACS to estimate the effect of passengers on the Q-factor of a typical airliner cabin.

[1]  J. Wiart,et al.  Variability analysis of SAR from 20 MHz to 2.4 GHz for different adult and child models using finite-difference time-domain , 2008, Physics in medicine and biology.

[2]  T. Nguyen.  RF loading effects of aircraft seats in an electromagnetic reverberating environment , 1999, Gateway to the New Millennium. 18th Digital Avionics Systems Conference. Proceedings (Cat. No.99CH37033).

[3]  Ovidio Peña-Rodríguez,et al.  Scattering of electromagnetic radiation by a multilayered sphere , 2009, Comput. Phys. Commun..

[4]  R. W. Lau,et al.  The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues. , 1996, Physics in medicine and biology.

[5]  Adrian Muscat,et al.  Modeling electromagnetic interference generated by a WLAN system onboard commercial aircraft , 2010, Melecon 2010 - 2010 15th IEEE Mediterranean Electrotechnical Conference.

[6]  S.W. Ellingson,et al.  Path Loss From a Transmitter Inside an Aircraft Cabin to an Exterior Fuselage-Mounted Antenna , 2008, IEEE Transactions on Electromagnetic Compatibility.

[7]  I. D. Flintoft,et al.  Absorption cross-section of the human body in a reverberant environment , 2012, International Symposium on Electromagnetic Compatibility - EMC EUROPE.

[8]  C. L. Holloway,et al.  A three-antenna technique for determining the total and radiation efficiencies of antennas in reverberation chambers , 2012, IEEE Antennas and Propagation Magazine.

[9]  Larbi Talbi,et al.  The Effect of the Human Body on MIMO-UWB Signal Propagation in an Underground Mine Gallery , 2012 .

[10]  A. Ahlbom.  Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields (up to 300 GHz) , 1998 .

[11]  K. Harima.  Estimation of power absorbed by human body using reverberation chamber , 2012, 2012 IEEE International Symposium on Electromagnetic Compatibility.

[12]  J. Kostas,et al.  Statistical model for a mode-stirred chamber , 1991 .

[13]  J. Clegg,et al.  Optimization of stirrer designs in a reverberation chamber , 2005, IEEE Transactions on Electromagnetic Compatibility.

[14]  国際非電離放射線防護委員会.  ICNIRP statement on the "Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields (up to 300 GHz)". , 2009, Health physics.

[15]  M. O. Hatfield,et al.  Electromagnetic Reverberation Characteristics of a Large Transport Aircraft , 1994 .

[16]  J. Rosny,et al.  Measurements of the total scattering and absorption cross‐sections of the human body , 2003 .

[17]  Franco Moglie,et al.  Modeling of the human exposure inside a random plane wave field , 2011 .

[18]  J. Wiart,et al.  Influence of Plane-Wave Incidence Angle on Whole Body and Local Exposure at 2100 MHz , 2011, IEEE Transactions on Electromagnetic Compatibility.

[19]  Ian D. Flintoft,et al.  Development of a layered broadband model of biological materials for aerospace applications , 2011, 10th International Symposium on Electromagnetic Compatibility.

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

[21]  Luc Martens,et al.  Experimental Assessment of Specific Absorption Rate Using Room Electromagnetics , 2012, IEEE Transactions on Electromagnetic Compatibility.

[22]  G. Vickers.  The projected areas of ellipsoids and cylinders , 1996 .

[23]  Isabelle Junqua,et al.  A Network Formulation of the Power Balance Method for High-Frequency Coupling , 2005 .

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

[25]  I. Laakso,et al.  SAR variation study from 300 to 5000 MHz for 15 voxel models including different postures , 2010, Physics in medicine and biology.

[26]  G. Dumitru,et al.  Risk factors for cardiovascular disease , 2018, Oxford Medicine Online.

[27]  I. D. Flintoft,et al.  People and planes: Development of broadband EMC models of biological materials in aircraft , 2011, 2011 XXXth URSI General Assembly and Scientific Symposium.

[28]  Kin Lien Chee,et al.  Reverberation and Absorption in an Aircraft Cabin With the Impact of Passengers , 2012, IEEE Transactions on Antennas and Propagation.

[29]  Dai-ichi Nuclear Accident,et al.  The International Commission on Radiological Protection , 1963, Nature.