Study of radiation patterns of circular patch antenna at different modes

In this paper, the probe position effects on efficiency of mode excitation, radiation pattern and null steering has been studied. The radiation patterns for different combinations of the mode have been obtained here. It has been observed that the radiation patterns has two nulls which can be steered independently and is required in many applications such as antijamming antennas. The radiation pattern reconfiguration is achieved by exciting the dominant TM11 mode along with the higher order TM21 and TM31 modes. It is found that the symmetry of the radiation pattern can be improved by the finite ground plane.