FDTD simulation for small antenna geometries by using non-uniform mesh algorithm

Numerical modeling of realistic engineering problems using the FDTD technique often requires smaller cell size, higher simulation accuracy and less computation resources. But in the simulation of small antennas, an obvious limitation of FDTD simulation is the trade-off between accuracy and computation resource. To reduce the computation resource for FDTD calculation, a high performance solution, the non-uniform mesh FDTD was proposed in a previous paper (see IEICE Trans. Commun., vol.E83-B, no.7, p.1544-53, 2000). The proposed algorithm allows flexible cell size, which can improve the accuracy of modeling and reduce the computation resource. In this paper, we calculated several small antenna geometries by using the non-uniform mesh FDTD algorithm. The computer simulation results are compared with the uniform mesh FDTD method and measurement results.