Effective approach to generate electrically large rough surfaces and the application to EM scattering problems

摘要

The small slope approximation (SSA) is a widely employed way to analyse the electromagnetic (EM) scattering problems from rough surfaces. However, it requires a surface sampling interval less than one-eighth of the wavelength, which makes it suffer from the problems of large memory consumption and low calculation efficiency for large rough surfaces, especially for higher microwave bands. In this study, a new way to generate the electrically large rough surfaces is proposed and its application to the calculation of EM scattering field is introduced on the base of first-order SSA. The calculation accuracy and consumed computer memory of the proposed method analysed by numerical comparisons show good performance.