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[[File:Smith_chart.svg|thumb|An impedance Smith chart (with no data plotted).]]The '''Smith chart''', invented by [[Phillip H. Smith]] (1905–1987), is a graphical aid or [[nomogram]] designed for [[electrical engineers]] and [[electronics engineers]] specializing in [[radio frequency]] (RF) engineering to assist in solving problems with [[transmission lines]] and [[matching circuits]].

== Description ==

Use of the Smith chart utility has grown steadily over the years and it is still widely used today, not only as a problem solving aid, but as a graphical demonstrator of how many RF parameters behave at one or more frequencies, an alternative to using tabular information.

The Smith chart can be used to simultaneously display multiple parameters including impedances, admittances, reflection coefficients, S_{nn}\, scattering parameters, noise figure circles, constant gain contours and regions for unconditional stability, including mechanical vibrations analysis.

The Smith chart is most frequently used at or within the unity radius region.

However, the remainder is still mathematically relevant, being used, for example, in [[oscillator design]] and [[stability analysis]].

== See also ==

* [[Nomogram]]

== External links ==

* [https://en.wikipedia.org/wiki/Smith_chart Smith chart] @ Wikipedia

[[Category:Electrical engineering]]
[[Category:Electronic engineering]]