![]() ![]() Z is defined only for a series circuit Must convert a parallel circuit to a series circuit Frequency must be known to do the conversion Both component values change when converted Z = RP + jXP = ? XP RP RS = RP x XP2 RP2 + XP2 XS = RP2 x XP XS Z = RS + j XS RS Specify a frequency L C XL XC => Step 1 R R X = XL XC X => Z => Step 2 R R Z = R + j X = R + j(XL – XC) = R + j Z = Z and q Resistance and reactance => Z = R + jX (Complex Number) Magnitude and phase => Z = Z q Magnitude of Z (ohms) = Z = R2+X2 Phase of impedance (degrees) = q = arctan(X/R) R Z X q Z Unit of measure = Ohm = W Impedance describes a series circuit Impedance has two components: The DC component = Resistance = R (ohms) The AC component = Reactance = X (ohms) Inductive Reactance Capacitive Reactance XL (ohms) = + j2pfL XC (ohms) = - j Phase = + 90o Phase = o (Voltage leads current) (Voltage lags current)Ĥ Impedance – cont’d Impedance can be expressed in two ways: Presentation on theme: "Transmission Lines As Impedance Transformers"- Presentation transcript:ġ Transmission Lines As Impedance Transformersīill Leonard N0CU 285 TechConnect Radio Club 2017 TechFestĢ Topics Review impedance basics Review Smith chart basicsĭemonstrate how antenna analyzers display impedance data Demonstrate some important transmission line characteristicsģ Impedance Impedance (Z) is a measure of the opposition to current flow ![]()
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