1 . cf =1 for sphere.РA plate of A=ab, total surface area S=2A, cf >0.9.РaРbРAР2018/8/7РMicrostrip Parallel Plate Capacitor– from Synthetic AsymptoteРThe near asymptote – parallel plateРThe far asymptote – isolated plates on half space (fringe field)РAРerРtР2018/8/7РThe synthetic asymptote (sum with adjustment n)РMaximum errors: 10% for n = 1, 1% for n = 1.114.РY. Leonard Chow and Wan C. Tang, “Development of CAD formulas of integrated ponents - fuzzy EM formulation followed by rigorous derivation,” Journal of ic Waves and Applications, vol. 15, pp. 1097-1119, Aug. 2001.Р2018/8/7Рer=9.6; A=1m2.Р2018/8/7Р平行双线传输线的单位长度的电容Р例3.1.4 平行双线传输线的结构如图所示,导线的半径为 a ,两导线轴线距离为 D ,且 D >> a ,设周围介质为空气。试求传输线单位长度的电容。Р解:设两导线单位长度带电量分别为+rl 和-rlР由于 D >> a ,故可近似地认为电荷均匀分布在两导线的表面上。Р应用高斯定律和叠加原理,可得到两导线之间的平面上任意一点 P 的电场强度为
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