# s_parameter - Review on S-Parameters Network...

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Review on S-Parameters 23-1-2007

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V 1 I 1 V 2 I 2 + - + - 11 1 1 1 2 2 22 1 1 2 2 2 VZ IZ I I Z I = + =+ 1 1 1 2 2 1 1 2 2 2 I YV YV I = + 1 1 1 2 2 1 1 2 2 2 VH IH V I HI HV = + Z-Parameter Y-Parameter H-Parameter A two-port device can be described by a number of parameter sets. All of these network parameters relate voltages and currents at each of the two ports. These are the network variables. Network Characterization
Incident Wave Reflection Wave Transmitted Wave Medium 1 Medium 2 12 ZZ Γ= + 2 2 Z T = + Current Continuous Power Lossless Characteristic Impedance (Z 1 ) Characteristic Impedance (Z 2 ) V θ Concept of Traveling Wave

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V 1 + V 1 - V 2 + V 2 - 2 1 11 1 0 V V S V + + = = 2 2 21 1 0 V V S V + + = = 1 1 12 2 0 V V S V + + = = 1 2 22 2 0 V V S V + + = = *Characteristic Impedance (Z 0 ) is defined 11 1 1 1 2 2 22 1 1 2 2 2 VS V S V V S V ++ =+ Formulation of S-Parameter
j ij i V S V + = () 2 10 j ij i V Sd B L o g V + ⎛⎞ = ⎜⎟ ⎝⎠ 10 __ _ _ _ _ ij power output at port j B L o g power input at port i = * dB=power ratio but not voltage/current ratio Magnitude and dB representation

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## This note was uploaded on 05/01/2011 for the course ELECTRICAL EE5602 taught by Professor Xuequan during the Spring '11 term at City University of Hong Kong.

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s_parameter - Review on S-Parameters Network...

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