Fast Solution To Electromagnetic Radiation And Scattering Problems Using The Moment Method With Impedance Matrix Interpolation

In this dissertation, the radiation problems of wire antenna mounted on the arbitrary shaped conducting platform and the scattering problems of arbitrary shaped conducting objects are analyzed using impedance matrix interpolation with the moment method.The Rao-Wilton-Glisson basis function based on triangular patches is used in the moment method. A junction basis function based on triangular patches is adopted to deal with the key problem of the junction between the wire and patches.Meanwhile, an efficient method, impedance matrix interpolation, is described. The impedance matrix is calculated at relatively large frequency intervals and interpolated to approximate its values at intermediate frequencies. By calculating RCS of arbitrary shaped conducting objects and the input admittance of a wire antenna on the arbitrary shaped conducting platform, it is shown that the method of impedance matrix interpolation can greatly reduce the computation time compared with the traditional moment method. The validity and efficiency of the method is demonstrated by the numerical results.