lec3 - we can again use basic circuit theory Model takes...

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EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2003 LECTURE 3 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA 01619 copyright © 2003, R. Ludwig Copyright, 1998 © R. Ludwig
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EE3113_L3 2 Transmission Line Analysis • Propagating electric field • Phase velocity • Traveling voltage wave ) cos( 0 kz t E E X X = ω Time factor Space factor r p c f v ε εµ λ = = = 1 k kz t E t z V X ) sin( ) , ( 0 =
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EE3113_L3 3 High frequency implies spatial voltage distribution • Voltage has a time and space behavior • Space is neglected for low frequency applications • For RF there can be a large spatial variation
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EE3113_L3 4 Generic way to measure spatial voltage variations • For low frequency (1MHz) Kirchhoff’s laws apply • For high frequency (1GHz) Kirchhoff’s laws do not apply anymore
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EE3113_L3 5 Kirchhoff’s laws on a microscopic level • Over a differential section
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Unformatted text preview: we can again use basic circuit theory Model takes into account line losses and dielectric losses Ideal line involves only L and C EE3113_L3 6 Example of transmission line: Two-wire line Alternating electric field between conductors alternating magnetic field surrounding conductors dielectric medium tends to confine field inside material EE3113_L3 7 Example of transmission line: Coaxial cable Electric field is completely contained within both conductors Perfect shielding of magnetic field TEM modes up to a certain cut-off frequency E H EE3113_L3 8 Example of transmission line: Microstrip line Cross-sectional view Low dielectric medium High dielectric medium EE3113_L3 9 Triple-layer transmission line Conductor is completely shielded between two ground planes Cross-sectional view...
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This note was uploaded on 01/31/2012 for the course EE 4002 taught by Professor Scalzo during the Fall '06 term at LSU.

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lec3 - we can again use basic circuit theory Model takes...

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