A novel hybrid design methodology for EBG structures with application to mutual coupling reduction in antenna arrays

This paper presents a novel methodology for designing electromagnetic bandgap (EBG) structures, employing a hybrid approach that integrates the direct transmission method with dispersion analysis to address the limitations of conventional single approach design frameworks relying solely on dispersion analysis. By combining these techniques, the method enables a comprehensive evaluation of bandgap characteristics of binary pattern generated through binary particle swarm optimization algorithm, resulting in two uniplanar EBG geometries that achieve significant lower bandgap frequency compared to conventional counterparts. To achieve precise bandgap alignment at the desired frequency, a linear optimization process with pixel segmentation is introduced. Experimental validation through integration into a dual-element microstrip antenna array confirms the designed EBG structure’s ability to reduce mutual coupling, highlighting their effectiveness in suppressing surface waves.