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时间: 2020-1-13 16:04
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SmithChartSheet1of13SmithChartTutorialPart1TobeginwithwestartwiththedefinitionofVSWR,whichistheratioofthereflectedvoltageovertheincidentvoltage.TheReflectioncoefficientΓissimplythecomplex(iehasphase)versionofVSWR:Definevoltagestandingwaveratio(VSWR)VmaxV1+V2=VminV1V2VoltagereflectioncoefficientΓ-ComplexV1e+j..lβV2e-j..lβT.LZLLΓ=V2eV=2ej2β.l+j.β.lV1V1eV2V1j.β.lAttheloadΓ(l=0);Γ=butthismaybecomplexnumberifthereisaninstantaneousphasechangewhichwe’llcall(φ)onreflection.V2V2V2j=e.....(a)L=0V1V1PhaseDiagramV1θSheet2of13AtL>0Γ(L)=Γ(0)ej.φ=V2V1ej(φ2βl)ForalosslesslineV1&V2donotvarywithL∴Γisconstant=……