FDTD analysis of serial corner-fed square patch antennas for single- and dual-polarised applications

The finite-difference time-domain (FDTD) method is developed for the analysis of serial corner-fed square patch antennas. A special technique to model the slanted metallic boundaries of the patch antenna has been used in the general FDTD algorithin to avoid the staircase approximations. The method improves the accuracy of the original FDTD algorithm without increasing its complexity. Both the one-port and two-port cases are studied, which are for single- and dual-polarised applications, respectively. Several antenna elements are manufactured. An isolation of –25 dB is achieved by the two-port antenna, which makes it suitable for many dual-polarised applications. The numerical analysis is confirmed by the experimental results and by results published elsewhere.