Since XFdtd includes frequency-dependent dielectric and magnetic materials, it is capable of making three-dimensional calculations for double negative materials, also called negative index materials and metamaterials.
The Rotman Lens Designer (RLD) software output is compared to full wave results from XFdtd for a single lens design realized using different thicknesses of the same dielectric material to determine best design practices.
The Rotman Lens Designer (RLD) software output is compared to full wave results from XFdtd for a broad range of design frequencies to validate the performance of the software in different bands of operation.
This example serves as a validation exercise for the XFdtd computations of SAR and impedance and was originally performed by Ericsson Radio Systems personnel in the late 1990’s using a much earlier version of the software.
A multiband frequency selective surface is built using a ternary tree loop and modified tripole in order to block multiple frequency bands. Simulation using periodic boundaries in XFdtd demonstrates the effectiveness of the proposed structure.