Design of ground plane of a slotted microstrip patch antenna for EMI rejection

In this paper a novel design of a Slotted Rectangular Microstrip Patch Antenna with perturbation in ground plane is described which increases the interference rejection frequency bandwidth. A comparative study is also shown between two antenna with identical radiating element, one with a perturbed ground plane and another without perturbation. The proposed antenna is designed for operation at both the signal frequencies 1.9 GHz and 2.4 GHz. The results are obtained by modeling and simulation using Ansoft HFSS software tools. The result shows almost 13.5% interference rejection bandwidth at -10dB return loss without ground plane perturbation. Rejection bandwidth increased to 18.2 % with the use of ground plane perturbation in the same patch antenna.