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This paper discusses and compares two approaches for the analysis of SW propagation on modulated impedance surfaces. The first one is an extension of geometrical optics (GO) description for plane waves in graded index materials to surface waves (SWs) supported by modulated, impenetrable, isotropic or anisotropic impedance boundary conditions. The second one is a flat version of transformation optics...
This paper presents an effective and accurate approach for the derivation of the dispersion characteristics of impenetrable Metasurfaces (MTSs). This approach is based on a simple representation of the MTS impedance, depending on one parameter only, which is an equivalent quasi-static capacitance. This procedure can be used to effectively characterize the surface wave (SW) supported by the MTS, as...
This paper presents a new type of metasurface (MTS) particularly suited to the integration of optically controlled switches. It consists of a checkerboard-type layout, made of electrically small complementary metallic patches and apertures. The characteristics of the supported electromagnetic field depend on whether the patches' vertexes are interconnected or not. Specifically, in a structure containing...
In this paper, Transformation Optics is exploited to design anisotropic modulated metasurfaces able to control the wavefront and Poynting vector distribution of surface waves. This methodology can be applied to design a large number of planar devices. As an example, a beam shifting device has been implemented using a metasurface consisting of dipoles printed on a grounded slab. The capability of the...
A metasurface is a thin metamaterial layer characterized by unusual reflection properties of plane waves and/or dispersion properties of surface/guided waves. Metasurfaces can be realized at microwave frequencies by printing a dense periodic texture of small elements on a grounded slab, with or without shorting vias. These structures have been widely used for realizing electromagnetic bandgap (EBG)...
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