A uniplanar hexagon electromagnetic band-gap structure for circuit size reduction applications

The electromagnetic band-gap (EBG) structures, initiated by the photonic bandgap (PBG) ideals [1], have been drawn much attentions due to the wave forbidden features for stop bands and the slow wave characteristics for passbands. Applications for antenna/array performance enhancements [2–3], filters designs [4], and electromagnetic interference reductions [5] are reported in literatures. Moreover, the uniplanar square-shape EBG is proposed for easier fabrications with good insertion loss performance, increasing the versatility of the EBG applications [6].