This paper propose a new 2-D FDTD method which analyze the response of infinite scattering objects excited by an oblique incidence of electromagnetic waves. Maxwell's equations, differential equations and PML absorbing boundary conditions (ABC) are derived. Connecting boundary where incident wave is inducted is computed by 1-D FDTD method. Several numerical calculations of this new FDTD method are provided which comparing the results of transmission line theory, proving correction and advantage of this mew method.
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