作　　者： ; ; ; ; ;

机构地区： 天津职业技术师范大学电子工程学院电子工程系

出　　处： 《天津工程师范学院学报》 2007年第3期6-10,共5页

摘　　要： 为了有效地计算矩形介质谐振器的主模,对变换方向隐式(ADI)时域有限差分(FDTD)算法的迭代系数进行修正,即添加各向异性参数修正相速度误差,从而减少数值色散,提高计算精度。给出了改进后的三维ADI—FDTD计算公式,并对算法的稳定性、色散关系以及各向异性参数的选取进行了研究,数值结果证明了所给方法的有效性。文中还用这种方法计算了位于电磁带隙结构上的矩形介质谐振器天线的方向图。 In order to calculate the main mode of the dielectric resonator antenna effectively, the iterating coefficients in the alternating-direction-implicit finite-difference time-domain （ADI-FDTD） method are modified . By inserting anisotropic parameters into the iterating coefficients, the error of the phase velocity is modified. Thus the numerical dispersion is reduced, and the accuracy of the calculation is increased. To validate the proposed algorithm, three-dimensional modified ADI-FDTD formulations are derived. The stability, dispersion relation, and selection of the anisotropic parameters of the algorithm are investigated in details. Then the validity of the algorithm is proved by numerical results. Finally, a rectangular dielectric resonator antenna located at the electromagnetic band gap structure is studied by using proposed algorithm.

关 键 词： 时域有限差分方法 各向异性系数 数值色散 介质谐振器天线

领　　域： [电子电信] [电子电信]