An Area-Averaged Conformal Technique for the Electromagnetic Simulations of Debye Medium

A novel area-averaged dielectric conformal technique combined with the finite-difference time-domain (FDTD) method has been investigated in accuracy and efficiency for modeling curved dispersive medium objects in this article. The proposed method utilizes an effective average dielectric constant, which is derived by area averages of different dielectric regions in irregular cells cut by curved surfaces, to modify the magnetic field updating equations in auxiliary differential equation FDTD method. The accuracy and efficiency of the method are verified by comparing the radar cross section results produced by the method of moments and the FDTD method with very fine meshes, respectively. Numerical results show that good agreements can be achieved by using coarse mesh size (12 cells per wavelength). Further, the proposed method is devoted to analyzing the bio-electromagnetic effects of a dispersive human body in a vehicle platform to show its good ability in solving such complex problems.