Wave Propagation, and Reflections

Slides:

Advertisements

Similar presentations

Waves and Transmission Lines Wang C. Ng. Traveling Waves.

Advertisements

Waves and Transmission Lines TechForce + Spring 2002 Externship Wang C. Ng.

EMLAB 1 Transmission line. EMLAB 2 An apparatus to convey energy or signal from one place to another place. Transmitter to an antenna connections between.

Chapter 13 Transmission Lines

Characteristic Impedance Contnd. Air Dielectric Parallel Line Coaxial Cable Where: D = spacings between centres of the conductors r = conductor radius.

Electromagnetic Engineering ECE292 Sophomore Seminar 18 March 2008.

ELCT564 Spring /9/20151ELCT564 Chapter 2: Transmission Line Theory.

Chapter 2: Transmission Line Theory

EEE340Lecture 391 For nonmagnetic media,  1 =  2 =  : Total reflection When  1 >  2 (light travels from water to air)  t >  i If  t = 

July, 2003© 2003 by H.L. Bertoni1 I. Introduction to Wave Propagation Waves on transmission lines Plane waves in one dimension Reflection and transmission.

Distributed constants Lumped constants are inadequate models of extended circuit elements at high frequency. Examples are telephone lines, guitar strings,

Lecture 6 Last lecture: Wave propagation on a Transmission line Characteristic impedance Standing wave and traveling wave Lossless transmission.

Transmission Lines

EEE340Lecture : Oblique Incidence at a Plane Dielectric Boundary A plane wave propagating in where z x.

Antennas and Propagation

Advanced Microwave Measurements

ENE 428 Microwave Engineering

1 ENE 429 Antenna and Transmission lines Theory Lecture 4 Transmission lines.

Lecture 4.  1.5 The terminated lossless transmission line What is a voltage reflection coefficient? Assume an incident wave ( ) generated from a source.

ECE 546 – Jose Schutt-Aine 1 ECE 546 Lecture -04 Transmission Lines Spring 2014 Jose E. Schutt-Aine Electrical & Computer Engineering University of Illinois.

Transmission Lines d a a b w h Two wire open line Strip line Coaxial Cable.

Trasmission lines.

10. Transmission Line 서강대학교 전자공학과 윤상원 교수

Transmission Lines Two wire open line a Strip line d w a Coaxial Cable

TELECOMMUNICATIONS Dr. Hugh Blanton ENTC 4307/ENTC 5307.

Transmission Lines No. 1  Seattle Pacific University Transmission Lines Kevin Bolding Electrical Engineering Seattle Pacific University.

Lossless Transmission Line If Then: All TEM, L’C’=µε Selected conductors: High conductivities Dielectric materials: negligible conductivities.

1 RS ENE 428 Microwave Engineering Lecture 5 Discontinuities and the manipulation of transmission lines problems.

1 Reading: Main 9.2 GEM REFLECTION AND TRANSMISSION.

Passive Devices (3 port network) S-matrix of 3 port networks (1) All ports are matched and network is reciprocal (2) can be lossless? 3 Port Network can.

1 RS ENE 428 Microwave Engineering Lecture 4 Reflection and Transmission at Oblique Incidence, Transmission Lines.

Inductance of a Co-axial Line m.m.f. round any closed path = current enclosed.

1.  Transmission lines or T-lines are used to guide propagation of EM waves at high frequencies.  Examples: › Transmitter and antenna › Connections.

So far, we have considered plane waves in an infinite homogeneous medium. A natural question would arise: what happens if a plane wave hits some object?

ENE 428 Microwave Engineering

Lale T. Ergene Fields and Waves Lesson 5.5 Wave Reflection and Transmission.

QUIZ 1 ECEC6503 TRANSMISSION LINES AND WAVEGUIDES

Electromagnetics II Unit 2 ： Line Terminated by Resistive Load, Transmission Line Discontinuity Lecturer: Professor Jean-Fu Kiang Text book: N. N. Rao,

Chapter 2. Transmission Line Theory

1.  Transmission lines or T-lines are used to guide propagation of EM waves at high frequencies.  Distances between devices are separated by much larger.

Figure 11.1 Figure 11.1 Basic transmission line circuit, showing voltage and current waves initiated by closing switch S 1.

HDT, 1998: Resistance, Inductance, Capacitance, Conductance per Unit Length Lossless case.

Lab2: Smith Chart And Matching

Smith Chart & Matching Anurag Nigam.

Chapter 10. Transmission lines

How does a signal go through the cable

Standing Wave Lecture 7 Voltage maximum

ELEC-E8409 HIGH VOLTAGE ENGINEERING

Characteristic Impedance Contnd.

Non-ideal property – crosstalk

Crosstalk Overview and Modes.

Transmission Lines & Resonators

transmission line models

REFLECTION AND TRANSMISSION II

Smith Chart Parametric Equations

ENE 428 Microwave Engineering

Crosstalk Overview and Modes.

Electro-Magnetic Induction

IMPEDANCE MATCHING & SMITH CHART

Alternating Current 60 HZ

1. , , and the direction of propagation are all

ENE 428 Microwave Engineering

Plane EM Wave: Oblique Incidence

Notes 10 Transmission Lines (Reflection and Impedance)

lossless, reciprocal, and matched at all port

ENE 428 Microwave Engineering

Crosstalk Overview and Modes.

Voltage Reflection Coefficient

plane waves in lossy material

Presentation transcript:

Wave Propagation, and Reflections Transmission Lines Wave Propagation, and Reflections

Electrical Wave Mechanics

Notice the reflection at the boundary where mechanical media change! Mechanical Waves Notice the reflection at the boundary where mechanical media change!

More Mechanical WaveAnalogy Jelly Babies Wave machine!

Old School Demo (still brilliant) https://www.youtube.com/watch?v=DovunOxlY1k&t=1328s (start at 19 min; 20 min in shows great demo) The legend Dr. JN Shive from Bell Labs demos wave reflections, inventor of __________ ??

Transmission Lines Image credits: Farid Farahmand, UC-Davis; Wikimedia Commons

Transmission Line Model Distributed inductance Distributed capacitance

Characteristic Impedance Input voltage V+ causes current I+ to flow in infinitely long line: Wave propagation speed zo ~ 50 W zo ~ 100 W

Avoiding Reflections: Impedance Matching 𝜌= 𝑟𝑒𝑓𝑙𝑒𝑐𝑡𝑒𝑑 𝑏𝑎𝑐𝑘𝑤𝑎𝑟𝑑 𝑤𝑎𝑣𝑒 𝑖𝑛𝑐𝑖𝑑𝑒𝑛𝑡 𝑓𝑜𝑟𝑤𝑎𝑟𝑑 𝑤𝑎𝑣𝑒 = 𝑧 𝐿 − 𝑧 𝑜 𝑧 𝐿 + 𝑧 𝑜 Reflection Coefficient incident zL zs reflected Set zL = zo for no reflections

Reflections Can Wreak Havoc Lab/testing action starts at 5 min. First 9 min is brilliant intro to transmission lines