In this note we briefly consider an important scale, implied but not drawn S-parameters can be graphed in several ways one option is to use two graphs (magnitude v frequency and phase v frequency) to represent one s-parameter.Īnother popular method, described briefly here, is via the use of Smith Charts.Ī Smith Chart is a polar plot with several different scales/axis overlaid onto the graph. comprising both magnitude and angle) because both the magnitude and phase of the signal are changed by the network. the voltage ratios of the waves) fully describing the behaviour of a device (in this example, a transmission line) under linear conditions at radio frequencies. S-parameters are the reflection and transmission coefficients between the incident and reflected waves (i.e. Recall that a linear network can be characterised by a set of simultaneous equations describing the waves, b1 and b2, exiting from each port in terms of incident waves, a1 and a2, The Smith Chart displays reflection coefficient in terms of constant normalised resistance and reactance circles. The Si9000 v7 and later allows graphical representation of s-parameters S 11 and S 21 via a Smith Chart, a widely used tool for graphic solution of transmission-line networks.
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