A Miniaturized High-Gain (MHG) Ultra-Wideband Unidirectional Monopole Antenna for UWB Applications

A miniaturized high-gain (MHG) ultra-wideband (UWB) unidirectional monopole antenna with defected ground structure (DGS) is designed for ultra-wideband applications. The MHG antenna is printed on the FR4 substrate material with an overall size of 26.6-mm x 29.3-mm x 1.6-mm, which operates over the UWB frequency range and achieves the bandwidth between 3.1 GHz and 10.6 GHz. This high-gain unidirectional antenna exhibits a peak gain of 7.20 dB with an efficiency of 95%. The compact antenna is a simple overlay design of circular and rectangular patches with the partial ground plane exhibiting high gain and better directivity. The overlay patch antenna acts as the radiator for wider bandwidth compared to the fundamental design of patch antenna and is matched to an SMA connector via 50 Omega microstrip feed line. These simulated results are presented using HESS software package. The designed antennas are fabricated and validated by using Agilent Vector Analyzer.