Estimation of Reflection Coefficient and Surface Impedance from Absolute Values of the Near Field with Periodic Change

Michinari SHIMODA
Masazumi MIYOSHI
Kazunori MATSUO
Yoshitada IYAMA

IEICE TRANSACTIONS on Electronics   Vol.E92-C    No.1    pp.92-101
Publication Date: 2009/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E92.C.92
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and its Application)
electromagnetic waves,  inverse scattering problem,  estimation of surface impedance,  successive algorithm,  

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An inverse scattering problem of estimating the reflection coefficient and the surface impedance from two sets of absolute values of the near field with periodic change is investigated. The problem is formulated in terms of a nonlinear simultaneous equations which is derived from the relation between the two sets of absolute values and the field defined by a finite summation of the modal functions by applying the Fourier analysis. The reflection coefficient is estimated by solving the equations by Newton's method through the successive algorithm with the increment of the number of truncation in the summation one after another. Numerical examples are given and the accuracy of the estimation is discussed.