FDTD numerical EM problem solving technique has become one of the most popular tools for complex microwave system or antenna problems due to it's simplicity and credibility. But it has long been ignored that it is apt to lose it's all of merit when it is to deal with plane waves from outer side of FDTD region. There has been no way to realize plane incidnent wave with total field equation which is exact and has advantage in computing load over scattered field equation. The scattered field equation is not successful in some situation, especially when there is an abrupt variation in the target objects.
To overcome this problem, a simple but greatly efficient method using PML Absorbing Boundary Condition was suggested in this paper. PML-ABC was orginally developed to substitute Mur's ABC to enhance the absorbing efficiency in the FDTD outer walls. It is well known that with this layer's unique charateristic, FDTD`s mathematical error or unstability can be suppressed. But it is little known that it also provide the chance to substitute scattered field equation with total field equation. The method to accomplish this was suggested in this paper.
The new EM field computing method was applied to EMI/EMC related problems. Some materials expected to have similar composites with human body were chosen as a target object of simulation. With these, various simulations were performed to get 3-D pictures. Finally, human head MRI pictures were utilized for more realistic analysis. Resultly, EM field coupling with human head was shown by color SAR image.
