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A microwave gradient meta-surface is designed and fabricated. The structure is consist of a stack of two-dimensional (x-axis and y-axis) arrays of gradually-varied sub-wavelength elliptical rings, a dielectric substrate and a metallic ground plane. Both theoretical and experimental studies are conducted to demonstrate that the carefully designed y-axis phase gradient meta-surface supports high-efficiency...
The Bragg hypothesis provides a simplified representation of the complex real ripples that contribute to sea clutter returns. We propose to describe the microscopic profile of large-scale long waves by a set of sinusoidal ripples, which are assumed to be with the Bragg wavelength that satisfies the resonant condition, and travel along the local scattering lines of sight pointing towards and away from...
In this paper, we study how to choose the combination coefficient of the combined field integral equation (CFIE) by comparing the iteration steps in solving the relevant matrix equation using the conjugate gradient iterative method. The tentative principle to choose the CFIE combination coefficient is given in terms of the calculations of two typical models, a cylinder and a NASA almond, with different...
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