Abstract
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% /spl lambda//sub 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 bandgap 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.
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