时域有限差分法在有耗介质电磁能量吸收问题中的应用
USE OF THE FINITE-DIFFERENCE TIME-DOMAIN METHOD FOR CALCULATING EM ABSORPTION IN LOSSY DIELECTRIC SCATTERER
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摘要: 本文论述了用时域有限差分法计算平面电磁波照射下有耗介质中电磁能量的吸收问题。讨论了影响计算精度的各种因素。计算了均匀和分层均匀球体中能量的吸收和分布,并把计算结果与精确的解析分析进行了比较。还讨论了理想导电面的模拟问题,并把结果与镜象理论进行了对比。所有的结果都说明,在一定条件下,时域有限差分法能给出满意的结果。Abstract: The problems for calculating EM energy absorption by lossy dielectric scatterer irradiated by plane wave are discussed. The factors effecting the accuracy of com-putation are discussed. The calculated resuhs of EM energy absorption and its distribution in homogeneous and layered homogeneous lossy dielectric spheres are presented, and the com-parison of these results with analytical soturion is given. The calculation is carried out for dielectric cylinder on conducting ground as well, and the result is compared with the image theory. All the computations show that the finite-difference time-domain method can give satisfactory results.
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