Time-domain analysis of electromagnetic fields using the fast inverse Laplace transform

Abstract

Time-domain analysis of electromagnetic fields is indispensable for developing target identification, designing microwave devices, studying optical properties of materials, and so on. Many commercial softwares based on time-domain solvers are available and they are useful for practical applications of industrial design and modeling. However, it is still difficult to evaluate accuracy and reliability, since reference solutions of time-domain responses are quite limited. In this presentation, time domain responses of scattered waves from canonical structures are investigated using the fast inverse Laplace transform (FILT). In our method, the waves are firstly obtained in the complex frequency s domain. Next, the waves in the s domain are numerically transformed into the time domain using FILT. Our method has advantage to estimate and control computational error easily, and arbitrary sampling points in time can be selected. We demonstrate that time domain responses of scattered waves from canonical structures are computed for various shapes of the incident pulses and materials. Our results are reliable and highly accurate, and they are considered as reference solutions of time-domain electromagnetic fields.