Agilent Technologies Agilent 4396B User Manual
Page 102
S-P
arameters
Measurement
S-parameters
S
11
and
S
22
are
no
dierent
from
the
measurements
made
in
the
previous
section.
S
11
is
the
complex
re ection
coecient
of
the
DUT's
input.
S
22
is
the
complex
re ection
coecient
of
the
DUT's
output.
In
both
cases
,
all
unused
ports
must
be
properly
terminated.
T
o
display
the
trace
on
the
polar
chart,
press
4
F
ormat
5
N
NNNNNNNNNNNNNNNN
POLAR
.
The
results
of
a
typical
S
11
measurement
is
shown
in
Figure
5-15.
Each
point
on
the
polar
trace
corresponds
to
a
particular
value
of
both
magnitude
and
phase
.
P
olar
Chart
Shows
Magnitude
and
Phase
Magnitude
The
center
of
the
circle
represents
a
re ection
coecient
0
of
0,
that
is
,
a
perfect
match
or
no
re ected
signal.
The
outermost
circumference
of
the
scale
represents
a
0
=
1.00,
or
100
%
re ection.
Phase
The
3
o'clock
position
corresponds
to
zero
phase
angle
,
that
is
,
the
re ected
signal
is
at
the
same
phase
as
the
incident
signal.
Phase
dierences
of
90,
180,
and
270
degrees
correspond
to
the
12,
9,
and
6
o'clock
positions
on
the
polar
display
,
respectively
.
Figure
5-15.
S
11
on
P
olar
Chart
Data
Readout
Using
the
Marker
Press
4
Ma
rk
er
5
and
use
the
knob
to
position
the
marker
at
any
desired
point
on
the
trace
.
Then
read
the
frequency
,
magnitude
,
and
phase
in
the
upper
right
hand
corner
of
the
display
.
Or
,
enter
the
frequency
of
interest
from
the
data
entry
key
pad
to
read
the
magnitude
and
phase
at
that
point.
T
o
read
the
marker
data
in
logarithmic
,
linear
,
real/imaginary
,
impedance
(R+jX),
admittance
(G+jB),
or
SWR/phase
formats
,
press
4
Utilit
y
5
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SMTH/POLAR
MENU
and
select
the
desired
format.
5-16
Network
Measurement
Examples