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The frequency selective surface (FSS) properties of a planar EBG unit cell due to meander variations are studied. The meander EBG unit cell has meander line inductors and inter digitated capacitors to provide FSS characteristics. A 13 X 13 array of the EBG is used as a superstrate for a patch antenna operating at 10.8GHz to increase its directivity. The radiation characteristics of the patch antenna with and without FSS superstrates are simulated and analyzed. The patch antenna accompanied with the FSS superstrate shows 5dB improvement in directivity with a smooth radiation pattern at 10.8GHz.

Design of EBG Superstrate to Improve the Performance of Patch Antenna