03a Ludwig lec07 destek - Load and source matched line = Γ...

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EE3113_L7 1 EE 3113 INTRODUCTION INTO RF CIRCUIT DESIGN Lecture Notes for A-term 1999 LECTURE 7 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_L7 2 Sourced and Loaded Transmission Lines • Lossless transmission line with source ) ( ) 1 ( G in in G in in in Z Z Z V V V + = Γ + = + Voltage at the beginning of the transmission line is composed of an incident and reflected component! 0 0 Z Z Z Z G G + - = 0 0 Z Z Z Z L L + - =
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EE3113_L7 3 Power considerations } Re{ 2 1 * in in in I V P = ) 1 ( in in in V V Γ + = + ) 1 ( 0 in in in Z V I Γ - = + ) | | 1 ( | | 2 1 2 0 2 in in in Z V P Γ - = + ) | | 1 ( | 1 | | 1 | | | 8 1 2 2 2 0 2 in in S S G in Z V P Γ - Γ Γ - Γ - =
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EE3113_L7 4 Two special cases:
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Unformatted text preview: Load and source matched line = Γ = Γ S 2 | | 8 1 Z V P G in = Mismatch at source, but match at load = Γ 2 2 | 1 | | | 8 1 S G in Z V P Γ-= How to measure power? mW W P dBm P 1 ] [ log 10 ] [ = EE3113_L7 5 Return and insertion losses Return loss: | | log 20 | | log 10 ) log( 10 2 in in i r P P RL Γ-= Γ-=-= [dB] Insertion loss: ) | | 1 log( 10 ) log( 10 ) log( 10 2 in i r i i t P P P P P IL Γ--=--=-= [dB] No reflection Full reflection ∞ dB ∞ 1 0 dB 1 Ã RL SWR...
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03a Ludwig lec07 destek - Load and source matched line = Γ...

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