Parametric study of EBG bandwidth for grounded square patch arrays by dispersion analysis

This paper performs a parametric investigation into a couple of factors that influence the bandgap properties of electromagnetic bandgap (EBG) structures. The most common and easily fabricated grounded square-patch array is showcased here, and the two parameters investigated are the patch size relative to the unit cell and the dielectric slab thickness. It will be shown how a numerical search using just these two parameters along with a simple optimization procedure is able to rapidly arrive at a very wide EBG bandwidth of around 30%. Dispersion analyses of the patch array are entailed in conducting the studies. The concepts for the generation of the dispersion diagrams are also presented.