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An annular-ring loaded circular patch antenna with slot-ring array of EBG cells on the ground plane is presented. A comparison is made between the annular ring loaded patch on a conventional PEC groundplane and the same patch on a groundplane with a 2x2, a 4x4 and a 6x6 slot-ring EBG array. It was found that the annular-ring patch antenna with a 4 x 4 slot-ring array in the ground plane is superior in the overall performance (gain, impedance and axial-ratio bandwidth). The array of EBG was found to improve gain by 3.5dB and increase the bandwidth of input impedance by about 60% (from 56MHz to 85MHz) and the bandwidth of axial ratio increased by about 70% (from 14MHz to 24MHz).
Bao, X., Ruvio, G., Ammann, M.: Investigation on annular-ring patch antenna with EBG structure. EuCAP 2006, First European Conference on Antennas and Propagation. Nice, France, 6-10 November, 2006.