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VNA Fundamentals
Table 3-4.
SWR
SWR
Application Note
SWR, or Standing Wave Ratio, is a measure of the reflection from the DUT input port or
output port, and it must be used, therefore, with S
Table 3-5.
Group Delay
Group Delay (sec) = rate of change of phase over a specified frequency aperture
Application Note
Group Delay is a measure of the time delay of the signals that are propagating through the
DUT versus frequency (using S
through the DUT.
Table 3-6.
Smith Chart
Smith Chart = graphical tool for plotting impedance or admittance data versus frequency
Application Note
Use Smith Chart with S
Use the Inverted Smith Chart to plot admittance data.
Note: The Inverted Smith Chart is available only on VNA Master models MS20xxC.
Vector Network Analyzer MG
(
)
S
1
+
xx
=
------------------------- -
(
)
S
1
–
xx
or S
). Group delay is a good measure of phase distortion
21
12
or S
to plot the input or output impedance of the DUT.
11
22
PN: 10580-00289 Rev. K
3-4 Calculating and Displaying S-Parameters
or S
.
11
22
3-7
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