An application of FDTD using quadratic extrapolation

Finite difference time domain (FDTD) has been the most obvious choice of researchers to simulate an electromagnetic environment which is quite complex in nature. But the amount of time consumed in running the simulation has always been the limiting factor. In this work, a time efficient FDTD tool that is, Quadratic FDTD is developed and used for simulation of a rectangular cavity resonator. Traditional FDTD simulation was run for 50 number of time steps and out of these, data of first 35 time steps are used to train quadratic extrapolation finite difference time domain method (Q-FDTD) program. The Q-FDTD program is then used to predict the rest of the data. The proposed Q-FDTD is applied to a rectangular cavity resonator to evaluate the performance. It is observed that Q-FDTD can save considerable amount of time (almost 30%). The results of this Q-FDTD are compared with the results of traditional FDTD and excellent performance in time is observed.   Key words: Quadratic extrapolation, FDTD, EM-CAD, air-filled rectangular cavity resonator.