Studies Of Algorithm And Its Application For Electromagnetic Characteristic Of Objects In Multilayered Media

Numerical analysis methods for electromagnetic radiation and scattering by objects in planar multilayered media have urgent need in many applications such as radar targets and model, geophysics exploration, remote sensing, microstrip antenna and circuit simulation and signal integrality analysis and so on. This dissertation studies the integral equation method and its key techniques for three-dimensional scattering problems in multilayered media.In the first, the multilayered media mixed potential integral equation (MPIE) method is discussed. The proper integral equation and basis function about MoM are avoided the complexity. Due to the importance of Green's functions for multilayered media problems, the spectral Green's functions are derived using dipole source method, by which the efficient algorithms for free space problems can be easily extended to multilayered media case. The derivations lay a good foundation for the efficient evaluation of Green's functions and the fast solving of scattering problems by the method of moments (MoM).But because of surface wave, which is due to the poles, we can't get the accurate results of large dimension or high frequency. A effective method is presented to deal with poles and residuals to get the surface waves. Numerical results show the validity and accuracy of the method.At the last, this paper has analyzed objects in multilayered media using MoM. The scattering field and radiation field have been calculated by patch current using MoM. Validities of the results are judged by comparing with commercial electromagnetic simulation soft.