Application of signal-processing techniques to improve FDTD simulation results of resonant cavities

This paper presents the application of two signal-processing techniques, Hanning window and zero padding, to the results of simulations of propagating waves using the FDTD method. Two problems involving rectangular resonant cavities are addressed: an empty cavity and a cavity partially filled with a dielectric. Frequency spectrum plots and tables with the numerical results demonstrate the difference between the results obtained from the simulations with and without the use of these techniques, highlighting the improvements in the legibility of the graphs and in the accuracy of the numerical results.