Abstract
In this paper a novel compact electromagnetic band-gap (EBG) structure in a spiral shape is presented and investigated. This EBG cell introduces spiral structure to enlarge the capacitance between neighboring elements much, and get an extremely compact size. The simulations and experimental results have proved that the length of the spiral structure is only 30.9% of the conventional mushroom-like EBG structure. The structure also presents some merits to design multi-band EBG structure only by adjusting the length of capacitance and without changing the periodical size. Two applications are demonstrated, including radiation pattern improvement of patch antenna with novel EBG structure and steerable array with a linearly discrete beamsteering of 20° in steps of 10° at 3.0 GHz.
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