Abstract: A novel technique converting triangle mesh data to Yee’s cell is proposed for finite-difference time-domain(FDTD) computation. In a rectangular coordinate system, based on the model of triangle mesh-units of a target, its FDTD geometry model is obtained by using the projection and cross-point method. At the same time, by recording the electromagnetic parameter of the Yee-cell, the FDTD electromagnetic model is given. In this paper, the typical objects as a perfectly conducting (PEC) sphere and a PEC column are modeled with the aid of this novel technique, and their Radar Scattering Sectior(RCS) are calculated by using the FDTD method. The computational results agree with those by the other numerical methods. Finally, the FDTD model of one missile is presented using the novel technique, and its backscattering RCS is calculated by using the FDTD method. Results show that this novel technique is applicable, in particular, to the FDTD computation for complex objects.

Key words: triangle face-units, finite-difference time-domain modeling, finite-difference time-domain method