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NAME:
QUIZ 2
ECEN 322
Measurements on a
75

Ω
slotted line indicate that
S
= 2
.
5
, the distance between successive
voltage minima is 25 [cm], and the ﬁrst voltage minimum is located 15 [cm] from the load.
Use the Smith chart to determine:
(
a
)
the load impedance
Z
L
;
(
b
)
the input admittance
Y
in
35 [cm]
from the load. [NB: Mark all important points on the chart and explain, step by step, your solution
procedure.]
Solution
:
(
a
)
Mark the point
r
max
=
S
= 2
.
5
as
A
and draw the SWR circle through this point.
λ
= 2
×
25
[cm]
= 50
[cm]
,
‘
min
/λ
= 15
/
50 = 0
.
3
The voltage minimum occurs at point
B
, where the SWR circle passes through
r
min
= 1
/S
. From
this point, located at
0
WTL, move a distance 0.3 TL (counterclockwise), to a point at 0.3 WTL.
Draw a radial line through this point and mark its intersection with SWR circle as
C
. At point
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 Spring '08
 HALVERSON
 Volt

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