Estimation of Surface Impedance for Inhomogeneous Half-Space Using Far Fields

Michinari SHIMODA  Masazumi MIYOSHI  

IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.12    pp.2199-2207
Publication Date: 2005/12/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.12.2199
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Wireless Technologies and Computational Electromagnetics)
Category: EM Analysis
electromagnetic waves,  inverse scattering problem,  inhomogeneous surface impedance boundary,  Fourier analysis,  

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An inverse scattering problem of estimating the surface impedance for an inhomogeneous half-space is investigated. By virtue of the fact that the far field representation contains the spectral function of the scattered field, complex values of the function are estimated from a set of absolute values of the far field. An approximate function for the spectral function is reconstructed from the estimated complex values by the least-squares sense. The surface impedance is estimated through calculating the field on the surface of the half-space expressed by the inverse Fourier transform. Numerical examples are given and the accuracy of the estimation is discussed.