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The subject of directivity enhancement of microstrip patch antennas (MPAs), using either a Frequency Selective Surface (FSS) or a double-negative (DNG) metamaterial slab, has been investigated by a number of researchers in recent years. The purpose of this paper is to show that we can also achieve the same goal by using a much simpler design for the superstrate, namely a dielectric slab, whose performance...
In this article, we present the results of a comparative study of three different types of superstrates used to enhance the directivity of a microstrip patch antenna. The three superstrates are frequency selective surface (FSS) with dipole elements; a dielectric slab; and a double negative (DNG) slab. We find that microstrip antennas (MPAs) covered either by an FSS or a plain dielectric slab superstrate...
A new type of broadband electromagnetic (EM) absorber is designed with the genetic algorithm (GA). The absorber is based on a multilayer dielectric substrate sandwiched by the frequency selective surface (FSS) with resistive patch. Equivalent circuit theory shows that the normal incidence refection coefficient of this GA optimized structure is lower then -5 dB in the frequency band of 2-18 GHz with...
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