06 07 Network lec15 - scattering parameters •...

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EE3113_L15 1 EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 1999 LECTURE 15 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA 01609 copyright © 1999, R. Ludwig Copyright, 1998 © R. Ludwig
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EE3113_L15 2 Scattering parameters • There is a need to establish well-defined termination conditions in order to find the network descriptions for Z , Y , h , and ABCD networks • Open and short voltage and current conditions are difficult to enforce • RF implies forward and backward traveling waves which can form standing waves destroying the elements
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EE3113_L15 3 Solution: S-parameters • Input-output behavior of network is defined in terms of normalized power waves • Ratio of the power waves are recorded in terms of so-called
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Unformatted text preview: scattering parameters • S-parameters are measured based on properly terminated transmission lines (and not open/short circuit conditions) EE3113_L15 4 Measurements of Scattering Parameters 1 1 11 2 | = = a a b S 1 2 21 2 | = = a a b S 2 2 22 1 | = = a a b S 2 1 12 1 | = = a a b S Require proper termination on port 2 Require proper termination on port 1 EE3113_L15 5 Arrangement for measuring S-parameters • Properly terminated port 2 in order to make S 11 and S 21 measurements • Properly terminated port 1 in order to make S 22 and S 12 measurements Load impedance = line impedance input impedance = line impedance EE3113_L15 6 Example: S-parameters of T-network Port 1 measurements Port 2 measurements...
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06 07 Network lec15 - scattering parameters •...

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