Mutual Coupling Analysis Using FDTD for Dielectric Resonator Antenna Reflectarray Radiation Prediction

A simulation technique based on Finite-Difierence Time- Domain (FDTD) is used to analyze mutual coupling efiects in re∞ectarray environment. The neighbouring element method has the ability to analyze actual non-identical re∞ectarray unit-cell accurately compared to the traditional Floquet simulation which assumes all unit- cell is identical. It is also found that the nearest neighbouring unit-cell located in E-plane has a larger mutual coupling efiects compared to the neighbouring unit-cell in H-plane. A good agreement is shown between simulation and measurement results. This technique presents a new prediction method for the radiation pattern of re∞ectarray antenna.