On the measureable range of absorption cross-section in a reverberation chamber

Article English OPEN
Flintoft, Ian David ; Bale, Simon Jonathan ; Parker, Sarah ; Marvin, Andy ; Dawson, John Frederick ; Robinson, Martin Paul (2016)

Average absorption cross-section can be measured in a reverberation chamber with an uncertainty estimated from the number of independent samples of the chamber transfer function taken during the measurement. However the current uncertainty model does not account the loading effect of the object being measured or the presence of non-stochastic energy in the chamber, as characterized by the Rician K-factor. Here the uncertainty model for the absorption cross-section measurements has been extended to include both of these effects for the case of stepped mechanical tuning with a paddle and frequency tuning. The extended uncertainty formula has been applied to predicting the range over which absorption cross-section measurements can be made with a defined relative uncertainty in a chamber of given geometry, using both simple models for the reverberation chamber and the measured quality-factor and K-factor. The model has been validated using measurements on a set of absorbing cubes of different sizes compared to Mie Series calculation on sphere of equivalent surface area. The extended error model is particularly utile for the design of reverberation chambers and experiments for absorption cross-section measurements across a wide range of application areas.
  • References (19)
    19 references, page 1 of 2

    [1] U. Carlberg, P.-S. Kildal, A. Wolfgang, O. Sotoudeh, and C. Orlenius, “Calculated and measured absorption cross sections of lossy objects in reverberation chamber”, IEEE Transactions on Electromagnetic Compatibility, vol. 46, no. 2, pp. 146-154, May 2004.

    [2] A. Gifuni, “On the measurement of the absorption cross section and material reflectivity in a reverberation chamber," IEEE Transactions on Electromagnetic Compatibility, vol.51, pp. 1047-1050, November 2009.

    [3] I. D. Flintoft, G. C. R. Melia, M. P. Robinson, J. F. Dawson and A. C. Marvin, “Rapid and accurate broadband absorption cross-section measurement of human bodies in a reverberation chamber”, IOP Measurement Science and Technology, vol. 26, no. 6, pp. 065701, June 2015.

    [4] G. C. R. Melia, M. P. Robinson, I. D. Flintoft, A. C. Marvin and J. F. Dawson, “Broadband measurement of absorption cross-section of the human body in a reverberation chamber”, IEEE Transactions on Electromagnetic Compatibility, vol. 55, no. 6, pp. 1043-1050, December 2013.

    [5] P. Hallbjörner, U. Carlberg, K. Madsén and J. Andersson, “Extracting electrical material parameters of electrically large dielectric objects from reverberation chamber measurements of absorption cross section", IEEE Transactions on Electromagnetic Compatibility, vol. 47, no. 2, pp. 291- 303, May 2005.

    [6] I. D. Flintoft, M. P. Robinson, G. C. R. Melia, J. F. Dawson and A. C. Marvin, “Average absorption cross-section of the human body measured at 1-12 GHz in a reverberant environment: Results of a human volunteer study”, IOP Physics in Medicine and Biology, vol. 59, no. 13, pp. 3297- 3317, July 2014.

    [7] A. Bamba, D. P. Gaillot, E. Tanghe, G. Vermeeren, W. Joseph, M. Lienard and L. Martens, “Assessing whole-body absorption cross section for diffuse exposure from reverberation chamber measurements”, IEEE Transactions on Electromagnetic Compatibility, vol.57, no.1, pp.27,34, February 2015.

    [8] D. A. Hill, M. T. Ma, A. R. Ondrejka, B. F. Riddle, M. L. Crawford and R. T. Johnk, “Aperture excitation of electrically large, lossy cavities”, IEEE Transactions on Electromagnetic Compatibility, vol. 36, no. 3, pp.169-178, August 1994.

    [9] K. A. Remley, R. J. Pirkl, H. A. Shah and C.-M Wang, “Uncertainty from choice of mode-stirring technique in reverberation chamber measurements”, IEEE Transactions on Electromagnetic Compatibility, vol. 55, no. 6, pp. 1022-1030, December 2013.

    [10] C. L. Holloway, H. A. Shah, R. J. Pirkl, W. F. Young, D. A. Hill and J. M. Ladbury, “Reverberation chamber techniques for determining the radiation and total efficiency of antennas,” IEEE Transactionson Antennas and Propagation, vol. 60, pp. 1758-1770, April 2012.

  • Metrics
    0
    views in OpenAIRE
    0
    views in local repository
    28
    downloads in local repository

    The information is available from the following content providers:

    From Number Of Views Number Of Downloads
    White Rose Research Online - IRUS-UK 0 28
Share - Bookmark