Explicit temporal integrators for low-pass filtering of FDTD signals

The numerical dispersion properties of some higher order explicit marching-on-in-time methods for transient electromagnetic field simulations are investigated. In contrast to the most commonly used leapfrog time integration scheme, these alternative methods exhibit a numerical dissipation for high-frequency components. This property can be interpreted as a low-pass digital filter and exploited to suppress parasitic high-frequency noise (HF noise) in the field signals. The prospective application is the enhancement of the coupled simulation of electromagnetic fields and moving charges.