Abstract
This study analyses the effects caused by a new hexagonal defect ground-plane (DGS) structure when it is applied to a rectangular microstrip antenna and studies its effectiveness to suppress higher-order modes. To improve the rejection characteristics of the analysed DGS, a genetic algorithm was used to optimise its parameters. Controlling higher-order modes of the fundamental operating frequency was successfully demonstrated, and the experimental results showed that optimising the hexagonal DGS could enhance the S11 parameter of the fundamental mode while simultaneously suppressing or further attenuating higher-order modes. Such results are particularly important once DGS is applied for self-immunity of antennas against harmonic radiations by avoiding the use of a filter circuit.
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