相控阵天线时域有限差分计算中激励源分析

Excitation source in FDTD method calculate phased array antenna

在时域有限差分(FDTD)方法用于偶极阵列天线数值计算时,采用带有内电阻的缝隙馈电激励源模型,及选择自由度较大的调制高斯脉冲信号,来提高数值算法迭代计算的收敛速度;在各馈电单元的时域信号中通过引入合适时间延迟,实现对相应单元相位的控制。用二元相控阵列天线模型,验证了算法和程序是正确的;用六元相控圆形阵列天线,分析了该算法在实际相控阵天线问题分析中的应用。

Excitation source model with an internal source resistance in the dipole feeding gap is applied in the phased array antenna calculated by finite difference-time domain(FDTD) method,and the modulation Gaussian pulse is also used,which can improve the convergence.The proper time delay introduced in the time-domain excitation signal can lead the needed phase to each feed cell.The result of a dyadic phased array antenna validates the algorithm and the grogram,and a six-cell circular phased array antenna illustrates the application in practice.