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Abstract
Based on the analysis of the target cross section, the cross section expression for a target irradiated by the time-varying electromagnetic waves is presented utilizing its cross section in frequency domain. Result shows that the cross section of a target is easy obtained in time domain if only its cross section in frequency domain is known. This cross section is related to the factors of target scale, shape, the electromagnetic parameters of the medium of the target and the time-varying incident waves. This cross section is not restricted by the bandwidth. Finally its expression in engineering usage is presented.