4.1
Fill in the blank:
If a load or source resistance is equal to the characteristic
impedance of the transmission line, we say that the line is
matched (or
impedance matched)
.
4.2
List 4 ways to terminate a transmission line to minimize reflections.
Answers:
Series match, parallel match, resistancecapacitor match, diode
termination
4.3
A transmission line system has a DC source voltage
V
S
= 10 V,
R
G
= 20
!
,
Z
0
= 100
!
, and
R
L
= 1800
!
.
If the uncharged line is suddenly connected to the
source, what is the initial power expended by the DC source?
What is the
power expended by the DC source upon reaching the steady state, when
t
! "
?
Where did the extra power go?
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4.4
In the system shown below, the line has a oneway transit delay of
T
seconds.
The line is completely discharged for
t
!
0.
For
V
S
= 12 V,
R
G
= 25
!
,
Z
0
= 50
!
, and
R
L
= 100
!
, construct a reflection
diagram for the system for the time interval 0 <
t
< 6
T
.
Use this diagram to
plot the input power and the power dissipated in the load during this time
interval.
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 Summer '08
 CITRIN
 Impedance, iL, Transmission line, Impedance matching

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