Vna Master Implementation - Anritsu MS2024B Manual

9-3 VNA Master Implementation

Distance Domain
9-3 VNA Master Implementation
The Distance Domain implementation in the Vector Network Analyzer is trace based, which
makes it very flexible to use. Each of the four traces in the instrument can be configured
independently and can be in the frequency or distance domain. Each trace can also be
configured to represent any of the S-parameters. The Vector Network Analyzer (as an
example) can view S in the frequency domain using traces.
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One Way versus Round Trip
With the ability to transform any S-parameter, one question that arises is whether the time
or distance that is plotted represents a one-way or a round-trip propagation. The one-way
propagation represents the transmission (or 2-port) measurement, in which the signal is
transmitted from one port, propagates through the device under test, and is received on the
second port. One-way propagation occurs when transforming S .
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The round-trip propagation represents a reflection (1-port) measurement, in which the signal
is transmitted from one port, propagates through the device under test, fully reflects at the
end of the device, and is received back at the same port. Round-trip propagation occurs when
transforming S .
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For reflection measurements, the Vector Network Analyzer can handle the two cases of
one-way and round-trip propagation differently in the Distance domain. In the distance
domain, the instrument compensates for the round trip reflection propagation by showing the
actual length of the device under test (essentially dividing the distance by 2 for the reflection
measurements). This compensation renders the distance reflection measurement as a
One-Way measurement in terms of the distance value that is reported.
Figure 9-1. Time Domain Measurements of a 3.05 m Cable Showing S and S
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9-2 PN: 10580-00289 Rev. K Vector Network Analyzer MG