System Overview
R&S
®
ZVT
64
Getting Started 1300.0045.62 ─ 10
Examples for special points in the Smith chart:
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The magnitude of the reflection coefficient of an open circuit (Z = infinity, I = 0) is
one, its phase is zero.
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The magnitude of the reflection coefficient of a short circuit (Z = 0, U = 0) is one, its
phase is –180 deg.
3.2.4.5
Inverted Smith Chart
The inverted Smith chart is a circular diagram that maps the complex reflection coeffi-
cients S"ii" to normalized admittance values. In contrast to the polar diagram, the scal-
ing of the diagram is not linear. The grid lines correspond to points of constant conduc-
tance and susceptance.
●
Points with the same conductance are located on circles.
●
Points with the same susceptance produce arcs.
The following example shows an inverted Smith chart with a marker used to display the
stimulus value, the complex admittance Y = G + j B and the equivalent inductance L.
A comparison of the inverted Smith chart with the Smith chart and the polar diagram
reveals many similarities between the different representations. In fact the shape of a
trace does not change at all if the display format is switched from "Polar" to "Inverted
Smith" or "Smith" – the analyzer simply replaces the underlying grid and the default
marker format.
Screen Elements
