The center of the diagram corresponds to the system reference impedance (Z/Z0 = 1).Grid lines of the diagram consist of circles of constant resistance and arcs of constant reactance.The horizontal axis is resistance reactance on this axis is equal to zero.Where - real part of the impedance (resistance), - imaginary part of the impedance (reactance).
Each point on the diagram is equivalent to the complex impedance of the DUT :.The angle is calculated counterclockwise.īasic properties of the Smith chart (See figure below ): The length of this vector is equal to the response amplitude, and the angle between the vector and the positive part of the real coordinate axis is equal to the phase of the response. Parameters of the vector directed to the point from the center of the diagram.Coordinates of the point (Re, Im) on the real and imaginary coordinate axes.On circular diagrams (Polar and Smith chart), any point of the trace can be defined in the following two ways (See figure below):
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