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Miniaturization of planar antennas is the first intention in antenna design for Ultra-Wideband (UWB) applications in which the surface wave effects reduce the antenna efficiency, gain and limit the bandwidth of microstrip antennas. The ground plane effects are minimized using a Defected Ground Structure (DGS) and multiple slots. A compact antenna size including both ground plane and radiator etched on the printed circuit board is 17mm × 22mm × 1.588mm is proposed. Addition of an asymmetrical strip and cutting slots on the antenna provides an enhancement in operating bandwidth of 2.9 to 11.4GHz for 10 dB return loss and the average radiation efficiency is 88.5% respectively. In particular, the impedance performance of the patch radiator is mainly due to the surface wave currents in the ground plane. The antenna results in an omnidirectional radiation pattern over the operating bandwidth with a gain of 2 dB and VSWR of 1 to 2.

A miniaturized planar antenna with defective ground structure for UWB applications