At last, the finite difference time-domain ( FDTD) method is used to research the transient process of the overhead lines. The results indicate that the ground return impedance has less effect on the self-impedance and more effect on the mutual-impedance. 最后,采用时域有限差分法(FDTD)对架空线的瞬态波过程进行仿真计算,结果表明:土壤阻抗对自阻抗影响较小,对互阻抗影响较大。
The effective design method of circular polarized crossed dipole feeds is presented analyzing the self-impedance of linear antennas and the useful design curves also is given here, the crossed dipoles is excited by a single hard coaxial-cable with a slot. 笔者对线性天线的自阻抗进行了分析,给出了十字交叉振子圆极化馈源的有效设计方法,采用一种开槽的单馈线激励十字交叉振子,并给出了适用设计的曲线。