Gate Shape Menu - Anritsu MS2024B Manual

VNA View Menus

Gate Shape Menu

Key Sequence: Measure > Domain Selection > Gate > Gate Shape
Gate Shape
Minimum: Press this soft key to set the gate shape value to Minimum.
Minimum
Nominal: Press this soft key to set the gate shape value to Nominal. The
Nominal gate shape is the default value and most commonly used one.
Nominal
Wide: Press this soft key to set the gate shape value to Wide.
Wide
Maximum: Press this soft key to set the gate shape value to Maximum.
Maximum
Back: Press this soft key to return to the previous menu.
Back
Figure 6-16. Gate Shape Menu
Note that the gate shape is analogous to the window selection. If the data are truncated with
a sharp gate (minimum, related to rectangular window), then maximum resolution is used in
determining the gate, but ripple is introduced in the frequency domain. For more gradual
gates, the resolution decreases in separating defects, but the size of the artifacts that are
added to the frequency domain data also decreases.
The window and gate shapes cannot be selected entirely independently because they interact
through the transform. In particular, the use of a very sharp gate with a low side lobe window
can lead to large errors. The following table shows the recommended combinations.
Table 6-1. Window Type and Gate Shape — Recommended Combinations
Window / Gate
Rectangular
Nominal
Low side lobe
Minimum side lobe
Vector Network Analyzer MG
Minimum Nominal
OK
OK
PN: 10580-00289 Rev. K
6-3 Domain Setup Menus
Wide
OK OK
OK OK
OK OK
OK
Maximum
OK
OK
OK
OK
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