Abstract
A compact wideband high-gain microstrip grid array antenna is presented.The antenna is printed on a dielectric substrate, backed by a metal board, and directly fed from a 50 Ω coaxial cable. It adopts elliptical radiation elements to enhance its impedance, gain bandwidths, and sinusoid lines to reduce its size. Structural parameters of a proposed antenna with seven radiation elements were optimized by a parallel genetic algorithm on a cluster system. A prototype antenna was fabricated and tested. Results of simulation and measurement agree well and show the antenna exhibits encouraging properties, for example, a S11 < −10 dB bandwidth of 25.1% and a 3 dB gain-drop bandwidth of 16.5%, both of which are much wider than that of conventional grid array antennas, as well as a maximum gain of approximately 13.8 dBi with an area-reduction factor of 46%. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1144–1147, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25895
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