Abstract
In this paper, the frequency-domain physical optics expression is derived from the normal electromagnetic scattering field calculation, and the general time-domain physical optics (TD-PO) expression is derived by inverse Fourier transform, and thus a time-domain physical optics calculation formula of an ideal conductor's scattering in the far field region is given. The metal plate and metal sphere's transient scattering in the far field region is programmed. The calculation results show that the time-domain physical optics has the lower requirements on computer hardware and faster computational speed. It is an efficient method to analyze electromagnetic scattering problem for electrically large objects.
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