While Smith had originally called it a " transmission line chart" and other authors first used names like " reflection chart", " circle diagram of impedance", " immittance chart" or " Z-plane chart", early adopters at MIT's Radiation Laboratory started to refer to it simply as " Smith chart" in the 1940s, a name generally accepted in the Western world by 1950. McRae, who were familiar with conformal mappings, was reworked into the final form in early 1937, which was eventually published in January 1939. Starting with a rectangular diagram, Smith had developed a special polar coordinate chart by 1936, which, with the input of his colleagues Enoch B. An important property of conformal mappings is that general circles are mapped to general circles. To this purpose in the plane a grid is drawn that allows to find the value of z at a given point. It was independently proposed by Tōsaku Mizuhashi ( 水橋東作) in 1937, and by Amiel R. 1 CAS, Trondheim, August 2013 RF Basic Concepts, Caspers, Kowina 1 A very basic use of the Smith Chart is to graphically convert values of into z and vice versa.
The Smith chart (sometimes also called Smith diagram, Mizuhashi chart ( 水橋チャート), Mizuhashi–Smith chart ( 水橋スミスチャート), Volpert–Smith chart ( Диаграмма Вольперта-Смита) or Mizuhashi–Volpert–Smith chart), is a graphical calculator or nomogram designed for electrical and electronics engineers specializing in radio frequency (RF) engineering to assist in solving problems with transmission lines and matching circuits. The Smith chart is a very valuable and important tool that facilitates interpre- tation of S-parameter measurements. For the similar term Volpert graph, see Volpert graph (disambiguation).
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