CAJ | 학술논문

Sommerfeld积分是计算多层媒质空域格林函数必须首先解决的问题,该文提出一种对直接DCIM的改进方法,与传统的一级和二级DCIM相比,这种方法求解得到的空域格林函数在近场区、中间场区和远场区都是准确的,并且不用提取准动态项和表面波分量,从而克服了传统DCIM提取这些项的困难.与直接DCIM相比,这种方法将直接DCIM中第一级近似采用的路径一分为二,在不同的路径上采用不同的采样参数,从而在不降低计算精度的前提下,通过减少总的采样点数,有效地减少计算量,缩短CPU时间,达到快速计算格林函数的目的.通过对微带结构格林函数的计算,数值仿真结果与相关文献吻合很好,证实了该方法的正确性.
Sommerfeld적분시계산다층매질공역격림함수필수수선해결적문제,해문제출일충대직접DCIM적개진방법,여전통적일급화이급DCIM상비,저충방법구해득도적공역격림함수재근장구、중간장구화원장구도시준학적,병차불용제취준동태항화표면파분량,종이극복료전통DCIM제취저사항적곤난.여직접DCIM상비,저충방법장직접DCIM중제일급근사채용적로경일분위이,재불동적로경상채용불동적채양삼수,종이재불강저계산정도적전제하,통과감소총적채양점수,유효지감소계산량,축단CPU시간,체도쾌속계산격림함수적목적.통과대미대결구격림함수적계산,수치방진결과여상관문헌문합흔호,증실료해방법적정학성.
Sommerfeld integration was the key problem which need to be solved in calculating the spatialdomain Green's functions(GF) in multilayered media. In the paper,an improved direct DCIM was proposed.Compared with the traditional one-level and two-level DCIM,the spatial-domain GF obtained by the method was accurate both in the near,intermediate and far-field regions without any quasi-dynamic and surface-wave extraction. So the difficulty the traditional DCIM had in extracting those quantities was overcome. Compared with the direct DCIM,the method separated the first level path of direct DCIM into two parts,and different numbers of samples were adopted on different paths. So the intention of fast-calculating the spatial-domain GF accurately was achieved with the computational load and the CPU-times reduced effectively by decreasing the total number' of samples. The GF results obtained from a microstrip case were consistent with relevant literature,which confirmed the correctness of this method.