ViewSmith
Smith charts are generally used in electronics in impedance measurements and impedance matching applications.
Smith chart plots the data in real and imaginary values (R + jX).
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Read more about the theory behind Smith charts in following blog.
PointLineSeries
ViewSmith’s PointLineSeries can be used to draw a line, a group of points or a point-line as in ViewPolar. Lots of line and point styles are available in LineStyle and PointStyle properties.

Smith data series.
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More details about PointLineSeriesSmith could be found on this page.
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For Step-by-step tutorial how to create your own Smith Chart application with LightningChart .NET library check following link.