Distributed-element circuit: Difference between revisions

Revision as of 23:22, 26 December 2018

Revision as of 23:29, 26 December 2018

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{{see also|Distributed element filter#History|Waveguide filter#History|Planar transmission line#History}}

[[File:Heaviside face.jpg|thumb|upright|alt=Photo of a bearded, middle-aged Oliver Heaviside|Oliver Heaviside]]

Distributed element modelling was first used in electrical network analysis by [[Oliver Heaviside]]<ref>Heaviside (1925)</ref> in 1881. Heaviside used it to describefind a correct description the behaviour of signals on the [[transatlantic telegraph cable]]. Transmission of early transatlantic telegraph had been difficult and slow due to [[dispersion (optics)|dispersion]], an effect which was not well understood at the time. Heaviside's analysis, now known as the [[telegrapher's equations]], identified the problem and suggested<ref>Heaviside (1887)</ref> [[loading coil|methods for overcoming it]]. It remains the standard analysis of transmission lines.<ref>Brittain, p. 39</ref>

[[Warren P. Mason]] was the first to investigate the possibility of distributed element circuits, and filed a patent<ref>Mason (1930)</ref> in 1927 for a coaxial filter designed by this method. Mason and Sykes published the definitive paper on the method in 1937. Mason was also the first to suggest a distributed element acoustic filter in his 1927 doctoral thesis, and a distributed element mechanical filter in a patent<ref>Mason (1961)</ref> filed in 1941. The acoustic work had come first, and Mason's colleagues in the [[Bell Labs]] radio department asked him to assist with coaxial and waveguide filters.<ref>{{multiref|Johnson ''et al.'' (1971), p. 155|Fagen & Millman, p. 108|Polkinghorn (1973)}}</ref>