A New miniaturized Planar Electromagnetic Bandgap (EBG) Structure with Dual Slits

This paper proposes a new planar EBG structure with dual slits included into the large metal patches and small connecting branches that connect adjacent EBG cells in the power/ground (P/G) plane pair. The paper then lunges into the study of a tuning method, to achieve isolation at the frequency of interest by scaling the extents of either of the slits in the proposed Dual Slits EBG (DS-EBG) structure without scaling the entire geometry. Further this paper investigates the bandwidth optimization method without affecting the center frequency of interest and the size of the metal patches. This paper supports the proposal with simulation results and measurements made on the proposed structure with unit cell size of 5.4 mm times 5.4 mm, the center frequency was tuned from 1.7 to over 6 GHz. The bandgap was widened to 2 GHz against the original bandgap of 1 GHz without changing the size of the DS-EBG structure for a given center frequency of 2.4 GHz, by using the bandwidth optimization method proposed.