EE3113_A2009_L7

EE3113_A2009_L7 - G in Z V P in Z Z G V G ECE3113_L7 5 Two...

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ECE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2009 LECTURE 7 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA 01609 copyright © 2009, R. Ludwig Copyright, 1998 © R. Ludwig
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ECE3113_L7 2 Objectives • What is the input power of a loaded TL? • How is power measured? • How are return loss and insertion loss defined?
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ECE3113_L7 3 Sourced and Loaded Transmission Lines • Lossless transmission line with source ) ( ) 1 ( G in in G in in in Z Z Z V V V 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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ECE3113_L7 4 Power considerations } Re{ 2 1 * in in in I V P ) 1 ( in in in V V ) 1 ( 0 in in in Z V I ) | | 1 ( | | 2 1 2 0 2 in in in Z V P ) | | 1 ( | 1 | | 1 | | | 8 1 2 2 2 0 2 in in S S
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Unformatted text preview: G in Z V P in Z Z G V G ECE3113_L7 5 Two special cases: Load and source matched line S 2 | | 8 1 Z V P G in Mismatch at source, but match at load 2 2 | 1 | | | 8 1 S G in Z V P How to measure power? mW W P dBm P 1 ] [ log 10 ] [ ECE3113_L7 6 Return and insertion losses Return loss: | | log 20 | | log 10 ) log( 10 2 in in i r P P RL [dB] Insertion loss: ) | | 1 log( 10 ) log( 10 ) log( 10 2 in i r i i t P P P P P IL [dB] No reflection Full reflection dB 1 0 dB 1 RL SWR...
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This note was uploaded on 10/13/2009 for the course ECE 3113 taught by Professor Ludwig during the Spring '09 term at WPI.

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EE3113_A2009_L7 - G in Z V P in Z Z G V G ECE3113_L7 5 Two...

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