Smith圆图使用说明简介
The Principle of Smith Chart 中華大學 通訊系 田慶誠tienchu.edu.tw03 51860301中華大學 通訊系RF工程師的算盤(ZY) Smith ChartZ Chart (Red)Y Chart (Green)你會心算嗎?電路分析速度快嗎?2中華大學 通訊系Reflection Coefficient G in Smith ChartGrGi|G|=0.45qG=63.4反射係數以極座標讀取G=1Z=OpenCircuitG=0Z=Z0MatchedCircuitG=-1Z=0ShortCircuit3中華大學 通訊系Z0=Reference impedancez= Normalized impedancer= Normalized resistancex= Normalized reactanceImpedance, Z v.s. Voltage Reflection Coefficient, G4中華大學 通訊系Impedance Plane and Smith (Z) ChartDevised by P. H. Smith, January 1939.r+jx-jxr=1x=1x=-1x=-1x=1r=1x=0r=0r=0z=0z=0 x=05中華大學 通訊系Constant Resistance r CirclesG=1r=OpenCircuitG=0r=1MatchedCircuitG=-1r=0ShortCircuitG=-1/3G=-2/3G=1/3G=2/3r=0r=1/5r=1/2r=1r=2r=56中華大學 通訊系Constant Reactance x Circlesx=0 x=0.5x=1.0 x=2.0 x=-0.5x=-1.0 x=-2.0 x0Inductive Loadx0Capacitive Loadx=0Resistive Load7中華大學 通訊系G v.s. Z in Smith Chartx=1.0r=1z=1+j1G=0.4563.4Z Chart in G plane8中華大學 通訊系Y0=Reference admittancey= Normalized admittanceg= Normalized conductanceb= Normalized susceptanceAdmittance, Y v.s. Voltage Reflection Coefficient, G9中華大學 通訊系Admittance Plane and Smith (Y) ChartDevised by P. H. Smith, January 1939.g+jb-jbg=1b=1b=-1b=0g=0g=0b=-1b=1g=1g=0y=0b=010中華大學 通訊系Constant Conductance g CirclesG=1g=0OpenCircuitG=0g=1MatchedCircuitG=-1g=ShortCircuitG=-1/3G=-2/3G=1/3G=2/3g=5g=2g=1g=1/2g=1/5g=011中華大學 通訊系Constant Susceptance b Circlesb=0b=-2.0b=-1.0b=-0.5b=2.0b=1.0b=0.5b0Capacitive Loadb=0Resistive Load12中華大學 通訊系G v.s. Y in Smith Chartb=-0.5g=0.5y=0.5-j0.5G=0.4563.4Y Chart in G plane13中華大學 通訊系VSWR Circles in Smith ChartVSWR2.0|G|1/314中華大學 通訊系