Smith chart
Smith chart a graphical polar plot of the voltage reflection coefficient superimposed on a plot of two families of circles, with one family representing the real part of a complex impedance (admittance) and the other family representing the imaginary part of the complex impedance (admittance). A smith chart can be used for many tasks including visualizing transmission line equations as well as matching loads to transmission lines, finding lengths and placements of stub tuners (both single and double stub tuners), finding the voltage standing wave ratio on a transmission line, and finding the reflection coefficient at any point on the transmission line.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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