Extreme Suppression for Mutual Coupling by Means of Miniaturized Uniplanar Electromagnetic Bandgap

A modified uni-planar compact electromagnetic bandgap structure (UC-EBG) is proposed to suppress the surface waves excited in between two rectangular microstrip patch antennas (RMSP). The antennas are functioning at WLAN applications at 5.8 GHz. The unit cell dimensions of the proposed modified UC-EBG are 7.3 mm×5.8 mm (20 % miniaturization of conventional U C- EBG). The patches are placed apart by 10 mm (0.2 λ0) edge to edge. Thanks to the modified U C- EBG cell, the mutual coupling between the two patches is improved by 45 dB and 2.5 dB compared to cases without using EBG and using conventional UC-EBG, respectively.