用隐式的伪谱时域方法分析宽带天线

Investigation of wide band antenna using alternating-direction-implicit pseudospectral time-domain method

为了对复杂结构的天线进行有效分析,采用了变换方向隐式(ADI)的伪谱时域(PSTD)方法,通过分析时间分裂步原理,将三维麦克斯韦方程组降阶为三组一维表达式,用于ADI-PSTD的计算。在保证精度的前提下,该方法计算效率显著提高。文章还给出了一种向外开口的U形双臂印刷天线结构,仿真和实验表明了这种天线具有良好的宽频带特性。

In order to investigate antenna with complex structure efficiently, the combination of alternating-direction-implicit （ADI） and pseudospectral time-domain （PSTD） method is used. By analyzing the time-step splitting principle, the ADI-PSTD method is therefore simplified. On the basis of conservation of accuracy, the computational efficiency is increased evidently for proposed method. In addition, a double-arm printing antenna is developed with structure of the U-type opening outward. The antenna is investigated by experiment and simulation. Results show that the antenna is with very good performance in the wide-band.