4 MEASUREMENT CONDITIONS SETTING
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4.7 Measurement Parameters Setting
4.7.1 S-Parameters
For high-frequency network analysis the following terms are applied: incident, reflected
and transmitted waves, transferred in the circuits of the setup (See figure 4.10).
Figure 4.10
Measurement of magnitude and phase of incident, reflected and transmitted signals
allow to determine the S-parameters (scattered parameters) of the DUT. An S-parameter
is a relation between the complex magnitudes of the two waves:
Smn =
transmitted wave at Port m
incident wave at Port n
The Analyzer allows measurement of the full scattering matrix of a 2-port DUT:
ú
ú
û
ù
ê
ê
ë
é
=
2221
1211
SS
SS
S
To measure the full scattering matrix, you do not need to change the connection of the
DUT to the Analyzer.
For the measurement of S11, S21 parameters, test Port 1 will operate as a signal source.
The incident and reflected waves will be measured by Port 1. The transmitted wave will
be measured by Port 2.
For the measurement of S12, S22 parameters, test Port 2 will operate as a signal source.
The incident and reflected waves will be measured by Port 2. The transmitted wave will
be measured by Port 1.
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