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Abstract
In this paper conducting cones with grooves, partially coated with a dielectric material, are simulated by using the MoM/BOR method for the case of near-axial incidence and with the FDTD for arbitrary incidence, including wide angles. Numerical efficiencies of the MoM/BOR and the FDTD are compared, and it is shown that the FDTD code is more efficient for simulating this structure for wide incident angles, especially when the dimensions of the structure are large in terms of wavelength. Diffraction mechanisms as well as creeping wave behaviors are studied by investigating both the time-domain results as well as animations of the induced currents on the surface of the cone.