Bandwidth optimization of a coplanar UWB patch antenna

A coplanar waveguide fed ultra wideband patch antenna with symmetrically positioned slots in the modified ground plane which can adjust the useful bandwidth is proposed in this paper. The antenna occupies an area 37.5mm × 27 mm on FR4 substrate. The analysis and simulation of the geometry has been done in FEM based High Frequency Structure Simulator (HFSS). The 10-dB return loss bandwidth of the antenna without slots spans from 2.96 GHz. to 7.96 GHz and 8.6 GHz to 11.15 GHz, whereas with a single pair of slots in the ground plane from about 2.8 GHz to 19 GHz. The bandwidth of the antenna can be adjusted by positioning a second pair of slots as per user requirements keeping the first pair of slots at the same position. It can be seen that when a second pair of slot is introduced in the ground plane at a particular position, the return loss bandwidth extends from 3GHz to 10.8GHz yielding ultra wide band. The position of the slots has been optimized through parametric analysis. The experimental results are in good agreement with the calculated values from simulation.