Agilent Technologies N4413A, User Manual

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Using the Multiport Test System
How to Interpret Mixed-Mode S-Parameters
Chapter 3 60
How to Interpret Mixed-Mode S-Parameters
S-parameters are commonly used to describe the performance of microwave and RF devices.
These parameters describe the behavior of the device when it is stimulated on a single port at
a time. By expanding the definition of S-parameters, the multiport test system extends this
ability to describe performance to devices with balanced ports.
See Agilent Application Note 1373-2 for more information.
How to Characterize Balanced Devices
Using the Data > Transforms functions, the multiport test system provides mixed-mode
S-parameter measurement. This section provides a sample characterization of a differential
device using the system to determine standard and mixed-mode S-parameters. The DUT is a
balanced transmission line. The device has been measured as a four-port single-ended device
with the following port definitions:
Balanced Transmission Line
NOTE These port definitions have changed from previous versions of the software. To
make data taken with older versions of the software compatible with this
version, the Port Exchange utility has been provided. See
“How to Use the Port
Exchange Utility” on page 76 .