摘要
由于微带结构复杂化和多样化,表面波对其影响也越来越复杂.分析了表面波的物理性质,从谱域格林函数出发,找出谱域格林函数的极点与表面波的关系,求得其中的表面波成份.为了便于分析,将谱域格林函数表示为TM模式和TE模式,并对TM和TE模式的极点分别进行提取.针对其极点的性质,对极点在上里曼面和下里曼面分别进行围线积分,从而有效地求解极点的留数,进而求出表面波成份.通过分析频率、介电常数和介质厚度对表面波的影响,得出电长度对表面波的重要作用,为改善微带结构的性能提供依据.
Because of the complexity and diversification of microstrip structures, the influence of surface wave on the characteristics of microstrip structures is more and more complex. In this paper, following an analysis to physical properties of surface wave and spectral domain Greens function, the relationship between poles of spectral domain Greens function and surface wave was found, then the surface wave components were obtained. For convenience of analysis, the spectral domain Greens function was expressed in terms of TM mode and TE mode, then their poles were extracted respectively. According to the features of these poles, the contour integrals surrounding the poles were perfomed in upper Riemann face and lower Riemann surface respectively, so that the residues of these poles were evaluated efficiently, and the surface wave components were worked out. Following the analysis of the influence of frequency, dielectric constant and medium thickness on the surface wave, we concluded that electric length plays an important role in surface wave, providing evidence for improving the performance of microstrip structures.
出处
《应用科技》
CAS
2008年第4期6-9,共4页
Applied Science and Technology
关键词
谱域格林函数
表面波
极点
留数
spectral domain Green
function
surface wave
poles
residues
