Abstract
A compact 2 × 2 ultra wideband (UWB) antenna array, composed of four planar rectangular monopoles, with a novel feeding network scheme is presented. The feeding network contains a power divider with a wideband balun and a 180° phase inverter in order to add the radiated electric fields of the array elements in-phase. A partial ground plane is used to achieve ultra wide bandwidth. The antenna array has a measured impedance bandwidth from 2.5 to 5.5 GHz with broadside radiation pattern and a measured peak gain of 13 dBi. The proposed array is suitable for portable UWB systems.
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