EE3113_A2009_L5

EE3113_A2009_L5 - W h Z eff ] ) / 1 ( 04 . ) / 12 1 [( 2 1...

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ECE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2009 LECTURE 5 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA copyright © 2009, R. Ludwig Copyright, 1998 © R. Ludwig
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ECE3113_L5 2 Objectives • What is the difference between a characteristic impedance and a conventional impedance? • What makes microstrip lines different from coax and parallel plate transmission lines? • What is the meaning of a reflection coefficient?
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ECE3113_L5 3 Lossless Transmission Line Model • Line representation ) ( ) ( 0 C j G L j R Z Characteristic impedance: Note : R, L, G, C are given per unit length and depend on geometry Lossless implies: R = G = 0!
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ECE3113_L5 4 Transmission Line Parameters for different line types 2-wire coax  a 1 ) 2 ( 1 a D ch R L G C ) 1 1 ( 2 1 b a  parallel-plate )) 2 /( ( 1 a D ch  )) 2 /( ( 1 a D ch  w 2 w d d w d w ) ln( 2 a b ) / ln( 2 a b ) / ln( 2 a b
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ECE3113_L5 5 Microstrip line 1 / ), 4 8 ln( 2 / 0 0 0 h W h W
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Unformatted text preview: W h Z eff ] ) / 1 ( 04 . ) / 12 1 [( 2 1 2 1 2 2 / 1 h W W h r r eff ECE3113_L5 6 What is a voltage reflection coefficient? Z Z Z Z L L Reflection coefficient at the load location ) ( 1 L Z ) ( 1 L Z ECE3113_L5 7 Standing Waves ) ( ) ( d j d j e e V d V ) 2 / cos( ) sin( 2 ) , ( t d V t d v ECE3113_L5 8 Standing wave ratio (SWR) | | 1 | | 1 | | | | | | | | min max min max I I V V SWR SWR is a measure of mismatch of the load to the line SWR=1 (matched) or SWR (total mismatch) match Open/short Note: Often SWR is also listed as VSWR for voltage standing wave ratio...
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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_L5 - W h Z eff ] ) / 1 ( 04 . ) / 12 1 [( 2 1...

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