International Publisher for Advanced Scientific Journals (IPASJ)
In this paper, the authors presented a novel spiral shape EBG (Electromagnetic BandGap) structure. This new EBG structure is a mushroom-like lattice with each element consisting of an inserted spiral branch. A typical period of the EBG lattice is 4.8% at the desired bandgap frequency. Compared with the conventional mushroom-like EBG structure, simulations results are presented, that the area of the spiral EBG structure is less than 14% of the former. Especially, an even lower bandgap position can be achieved if the winding of spiral branch is farther increased.