Abstract
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) stab. We find that microstrip antennas (MPAs) covered either by an FSS or a plain dielectric slab superstrate provide higher directivities than that realized by using a DNG superstrate. (C) 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 327-331, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24898