Department of Electrical and
Computer Engineering
ECSE 352 Electromagnetic Waves and Optics
1.2 Lossless Propagation on Transmission
Lines
References: Hayt and Buck 11.3
AGK 2006
1.2-1
Overview
In the previous class we studied the behaviour of transmission
li
d d
i
d
l
i
h
h
lines and derived a general wave equation that captures the
time and space evolution of voltage and current. In this class
we will look at the special case of lossless lines. This will
allow us to develop a much simpler wave equation, and we
will use this to find an expression for the speed of voltage and
current waves We will also look at the relationship of voltage
current waves. We will also look at the relationship of voltage
and current and define the impedance of a transmission line.
©AGK 2006
ECSE 352 1.2-2
Transmission line classes
A.
Transmission line basics
1.
Introduction
2.
Lossless transmission lines
3.
Harmonic waves on transmission lines
4.
Time independent (phasor) notation
5
Power transmission and loss
5.
B.
Analog signal transmission
6.
Resistive loads and reflections
7.
Voltage standing wave ratio
8.
Finite lines and input impedance
9.
Smith chart calculation techniques
10
Single stub matching
10.
C.
Digital signal transmission
11.
Transient analysis
©AGK 2006
ECSE 352 1.2-3
12.
Pulse propagation and initially charged lines
Contents
•
Review of general transmission line model
•
Voltage and current on lossless transmission lines
•
Signal speed on lossless lines
Th
l ti
hi
b t
lt
d
t
•
The relationship between voltage and current
•
Transmission line impedance
©AGK 2006
ECSE 352 1.2-4

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