Loading [MathJax]/jax/output/HTML-CSS/jax.js
Module 7.1 Smith Chart
zL
zL
yL on Z-Chart
yL
zL
參考阻抗 Z_{0}(refernce impedance) : \Omega
參考導納 Y_{0}(refernce admittance) : mS
負載阻抗 Z_{L} = + j \Omega
" =>Normalized impedance z: + j
負載導納 Y_{L} = + j mS
=> Normalized admittance y: + j
反射係數 \Gamma_{L}: \angle ° ( 顯示 \left|\Gamma\right| )  
(reflection coefficient) ( \Gamma_{L} = \left|\Gamma\right|\ * \angle \theta_{\Gamma} )
電壓駐波比 VSWR:
(voltage standing wave ratio)

Introduction:

藉由選擇不同的Chart去觀察:
  負載阻抗 Z_{L}
  負載導納 Y_{L}
  反射係數 \Gamma_{L}
在Smith Chart上的位置和變化,以及Z_{L}Y_{L}\Gamma_{L}VSWR的關係。

Parameters:

Load impedance: Z_{L} = R_{L} + jX_{L}
Normalized impedance: z = Z_{L} / Z_{0} = r + jx
Load admittance: Y_{L} = G_{L} + jB_{L}
Normalized admittance: y =Y_{L} / Y_{0} = g + jb
Reflection coefficient : \Gamma_{L} = \left|\Gamma\right|\ \angle \theta_{\Gamma}
  a. \left|\Gamma\right|:magnitude of   \Gamma_{L}, 0 \leqq \left|\Gamma\right|\ \leqq 1
  b. \theta_{\Gamma}:phase of \Gamma_{L}