Focusing on the problem that the conventional EBG structure isn't compact enough,a novel uniplanar electromagnetic band gap (UCEBG) structure is presented here,based on the physical mechanism of EBG structures and equivalent circuit model. Incorporated with the meandered strips and the long gaps of edge, this structure significantly enlarges the equivalent capacitance between neighboring elements, as well as increases the equivalent inductance. So, it becomes even more compact in size. An experiment has been carried out to verify the validit...