Analysis and design of L-probe proximity fed patch antennas

In this paper, the L-probe patch antenna is studied using the finite-difference time-domain (FDTD) method because of its flexibility and efficiency in solving complex heterogeneous geometries. The Berenger´s perfectly matched layer (PML) is used as the absorbing boundary condition (ABC). Extensive numerical results of the parametric study are presented. Characteristics including input impedance, and far-field radiation patterns are considered. The simulation results confirm the broadband characteristic of the antenna. In order to provide some design information, the variation of input impedance at resonance with different parameters is plotted on a Smith chart.