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A novel 2-D single-layer reflective phase gradient metasurface (RPGM) with polarization-independent property is proposed based on the generalized Snell's law of reflection. The well optimized RPGM consists of 24×24 suitably selected elements with paraboloidal phase distribution along x direction and −45° phase gradient along y direction, respectively. Pure focusing effect and anomalous reflection...
This paper investigates the feasibility of designing conformal reflectarrays on cylindrical surfaces, which provides insight into many radiation characteristics of conformal reflectarrays. A general array theory formulation is described that can be applied to any conformal reflectarray geometry. Convex and concave surfaces are studied and the radiation patterns, directivity, and bandwidth of these...
This paper investigates the effective gain of antennas in indoor channels. A metric called instantaneous effective gain is proposed, and a multiple-cluster 3D channel model is used to facilitate the proposed antenna effective gain. In the multiple-cluster channel model, Laplacian and double exponential distribution are utilized to model azimuth and elevation signal power distribution respectively,...
An analysis is presented and the performance of a sub-aperture of the diameter 105 meters in the Arecibo reflector is predicted for a scalar horn feed, the location of the phase center of which is chosen to minimize the effects of spherical aberration. It is shown that a high gain, reasonably good efficiency, and very good pattern performance can be attained over the range of 1 to 1.5 GHz with a single...
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