Concepts and Features
R&S
®
ZNA
191
User Manual 1178.6462.02 ─ 12
Window
Side lobe
suppression
Passband
ripple
Best for...
Normal Gate
(Hann)
32 dB
0.032 dB
Good compromise between edge steepness
and side lobe suppression
Maximum Flat-
ness (Bohman)
46 dB
0 dB
Maximum attenuation of responses outside the
gate span
Arbitrary Gate
Shape (Dolph-
Chebychev)
User defined
between 10 dB
and 120 dB
0.071 dB
Adjustment to individual needs; tradeoff
between side lobe suppression and edge
steepness
Time-Gated Frequency Domain Trace
The trace in the frequency domain depends on the state of the "Time Gate":
●
If the gate is disabled, the frequency domain (FD) trace corresponds to the mea-
sured sweep results before the time-domain transformation.
●
If the gate is enabled, the displayed frequency domain trace is calculated from the
time domain (TD) trace which is gated and transformed back into the frequency
domain.
The analyzer uses fixed "No Profiling (Rectangle)" window settings to transform the
measured trace into time domain. The TD trace is gated using the selected time gate.
The gated trace is transformed back into frequency domain using a "No Profiling (Rect-
angle)" window.
The shape, width and position of the time gate affect the gated frequency domain
trace. The window type selection in the "Define Transform" dialog is ignored. The
selected window is used again when the TD trace is displayed ("Time Domain: On").
The rectangular "No Profiling (Rectangle) "windows minimize numerical inaccuracies
near the boundaries of the measured frequency span. In the limit where the effect of
the time gate vanishes (e.g. a gate of type "Notch" and a very small width), the time
gated trace is equal to the original measured trace.
Optional Extensions and Accessories