Analysis of Electromagnetic Distribution in Building Illuminated with Airborne Antenna Array by Using a Half-space FDTD

In the analysis of electromagnetic characters around the buildings, the effects of ground are non-ignorable. To solve the problem, a half-space FDTD method with nonuniform meshes is proposed in this paper. Two 1-D modified FDTD equations have been employed to set TF/SF boundary of the infinite half-space electromagnetic problems, then the half space problem can be solved in finite space. A method with non-uniform meshes is applied to reduce the calculation time and meshes of the building with an electrically large structure. Finally, the electromagnetic fields in Building which illuminated by the airborne antenna array is analysed.