Measurements and result displays
R&S
®
QAR50
43
User Manual 1179.4992.02 ─ 02
A black line within the blue rectangle surrounding certain areas indicates the measure-
ment points that deviate no more than 3
dB from the maximum reflection value or the
minimum attenuation value. There can be several such areas in the image, depending
on the characteristics of the DUT. Those are the measurement points that actually con-
tribute to the mean reflection and attenuation values as indicated in the numerical
result table.
Measuring a homogenous (= flat, highly reflective) DUT usually results in a Gaussian
distribution of reflection values (due to the aperture weights of the antenna array). The
evaluated values are therefore concentrated to a single area in the image.
max. reflection
- 3 dB threshold
value range for
mean reflection
Figure 8-5: Mean reflection on a homogenous DUT
For inhomogeneous DUTs, the distribution can be different, so there maybe several
highlighted areas in the image, but the evaluation remains the same.
max. reflection
- 3 dB threshold
value range for
mean reflection
Figure 8-6: Mean reflection on an inhomogeneous DUT
Result diagram
Available with the optional frequency response application.
Result displays