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# 第 37 章 - PowerPoint PPT Presentation

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Review 2

1. 保角变换适合于TEM波传输线

2. 力线簇和位线簇在变换中始终保持正交（保角）

W-plane

z-plane

3. 在变换中力线与位线所围成的区域电容C保持不变

z-plane

w-plane

［例1］ 内外径分别为a和b的圆同轴线，为求其特性阻抗Z0

z-plane

w-plane

［解］ ω=u+jv=ln(rej)，即知

1. 带线特性阻抗

2.微带特性阻抗

（a）

（b）

(a)和(b)等价的含义是

Z01——空气微带的特性阻抗

e——等效介电常数

［例2］求解圆同轴线的衰减常数ac

［解］

1. 带线衰减常数ac（导体）

dB/m

2. 微带衰减常数ac（导体）

Note：（结论）考虑到实际情况

Y12=－vCab＜0

［例3］已知V1=1v，V2=0v和Zoe，Zoo，求出I1和I2

［解］：根据导纳矩阵关系