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Broadband loads are widely used. An example is the Anritsu 28 Series
Termination. These terminations are easy to use as calibration tools,
and they are adequate for most applications.
Sliding Loads are the traditional vector network analyzer Z
0
calibra
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tion reference. They provide the best performance when the applica
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tion requires high-precision return loss measurements. Sliding loads
consist of a connector, a long section of precision transmission line, and
a microwave load that is movable within the transmission line. One
thing to remember with sliding loads is that they have a low-frequency
limit and must be used with a fixed load below this cutoff frequency
for full frequency coverage. Anritsu sliding loads cut off at 2 GHz.
(V-connector sliding loads cut off at 4 GHz).
Pin depth—the relationship between the interface positions of the
outer and center conductors—is the most critical parameter under
your control in a sliding load. An example of its criticality is that an
incorrect pin depth of 0.001 inch can cause a reflection return loss of
44 dB. And, since we are trying to calibrate to accurately measure a 40
dB return loss, correct pin depth makes a big difference!
Cables in the measurement system are another cause for concern. The
main criteria for a cable are stability and repeatability. Anritsu offers
two types of cables that meet these criteria: semi-rigid and flexible.
Our semi-rigid cables provide maximum stability with limited flexibil-
ity of movement. Our flexible cables allow more freedom of movement
and provide good phase stability.
DISCUSSION MEASUREMENT CALIBRATION
7-10 37xxxE OM
BROADBAND LOAD
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Easy to Use
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Inexpensive
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Adequate for Most Applications
SLIDING LOAD
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Connector
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Long Transmission Line
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Movable Microwave Load