Abstract
In this paper, we present a novel approach to improving the bandwidth of microstrip antennas using frequency-selective surfaces (FSSs) as an artificial magnetic ground plane (AMG). The micro-genetic algorithm (MGA) is employed to derive an optimal FSS element configuration that achieves the zero-phase condition for the reflection coefficient of an artificial surface at the desired frequency band. Two AMG configurations for single- and tri-band applications are designed by using the MGA, and their performances are compared with those of PEC ground-plane cases after integrating the AMGs with microstrip antennas. It is demonstrated that the use of such a surface, in lieu of the conventional PEC ground plane, leads to an improvement in the bandwidth of planar antennas that are placed above the surface. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 6–13, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20532
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