Abstract
A new ultra wideband (UWB) antenna is proposed that can be efficiently used for different wireless UWB applications. The antenna structure has a very simple patch with Hibiscus petal pattern. The antenna is designed on a 31x31 mm(2) Rogers RT/duroid 5870 substrate with permittivity 2.33, loss tangent 0.0012, 1.57 mm thickness and a 50 ohm impedance microstrip fed line. Different parts of antenna are analyzed to optimize the antenna properties. The novel patch of the antenna is modified to achieve the desired wide bandwidth behavior. The simulation results show that the antenna has an impedance bandwidth of 145% from 3.2 to 20 GHz with VSWR<2, a stable omnidirectional radiation pattern, an average gain of 5.1 dBi and the average radiation efficiency is 85%, which is ideal for use in UWB applications. The proposed antenna was successfully prototyped and the measured results are consistent with simulation.