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In this paper, a novel electromagnetic bandgap (EBG) structure in a spiral shape is presented. 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%λ 0 at the desired bandgap frequency. Compared with the conventional mushroom-like EBG structure, simulations and experimental results have verified that the area of the spiral EBG structure is less than 14% of the former. Especially, an even lower bangap position can be achieved if the winding of spiral branch is farther increased. Also a double element microstrip antenna array inserted with the new EBG structure has been fabricated, showing a 4.93 dB mutual coupling reduction.Index Terms -Electromagnetic bandgap (EBG) structures, microstrip antenna arrays, mutual coupling, surface wave.

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