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The adapter removal technique provides a means to accurately measure noninsertable devices.
The following adapters are needed:
w
Adapter Al, which mates with port 1 of the device, must be installed on test set port 1.
n Adapter
A2,
which mates with port 2 of the device, must be installed on test set port 2.
n Adapter
A3
must match the connectors on the test device. The effects of this adapter will be
completely removed with this calibration technique.
NETWORK ANALYZER
Adapter Removal
Al
A2
\
DUT
REFERENCE
REFERENCE
PORT 1
PORT 2
A3
pg646e
Figure 5-11. Adapters Needed
The following requirements must also be met:
w
Calibration standards for performing a
2-port
error correction for each connector type.
w
Specified electrical length of adapter
A3
within
f
114
wavelength for the measurement
frequency range.
For each port, a separate
2-port
error correction needs to be performed to create two
calibration sets. The adapter removal algorithm uses the resultant data from the two
calibration sets and the nominal electrical length of the adapter to compute the adapter’s
actual S-parameters. This data is then used to generate a separate third calibration set in
which the forward and reverse match and tracking terms are as if port 1 and port 2 could be
connected. This is possible because the actual S-parameters of the adapter are measured with
great accuracy, thus allowing the effects of the adapter to be completely removed when the
third
cal
set is generated.
Optimizing Measurement
Resutts
541