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. Side note: A 180o rotation on a Smith chart makes a normalized impedance become its reciprocal. 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. It was independently proposed by Tōsaku Mizuhashi ( 水橋東作) in 1937, and by Amiel R. 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. ![]() ![]() For the similar term Volpert graph, see Volpert graph (disambiguation).
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