A New Circuit-Based EBG Design Technique for the Isolation Improvement between Monopole Antennas

A circuit-based EBG design technique to improve the isolation between monopole antennas is proposed for multicolumn mushroom EBGs. The design model is developed by estimating the effective reduction needed in the electrical dimensions of the EBG patches. This is achieved by comparing circuit-based simulation results with HFSS simulation results. For many different patch widths, substrate thicknesses, substrate dielectric constants and frequencies (1, 2.4, and 5.1 GHz) it is found that the effective electrical widths of the patches on the edge columns need to be reduced by 10-25% while those on the middle column need to be reduced by 20-40% in order to obtain a representative isolation vs frequency response using the proposed circuit-based model.