Editing Artificial transmission line

[[File:Artificial Telephone Line 6000ft, 24 gauge, Schematic.png|thumb|Schematic of an artificial telephone line section for 6000 feet of 24 gauge twisted pair.  L1 and L2 are effectively in series giving 1.12 mH of series inductance.]]

In [[telecommunications]], an '''artificial transmission line''' is a [[two-port network|two-port electrical network]] that has the [[characteristic impedance]], [[transmission time]] [[Response time (technology)|delay]], [[Phase (waves)|phase shift]], or other parameter(s) of a real [[transmission line]]. It can be used to [[simulate]] a real transmission line in one or more of these respects.<ref>[[Federal Standard 1037C]]</ref>

Early artificial lines were used in telephony research and took the form of a cascade of [[lattice phase equaliser]]s to provide the necessary delay.  The lattice phase circuit was invented by [[Otto Zobel]] in the 1920s.<ref>Zobel, O J, ''Phase-shifting network'', [https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US1792523.pdf US patent 1 792 523], filed 12 March 1927, issued 17 Feb 1931.</ref><ref>Zobel, O J, [https://archive.org/stream/bellsystemtechni02amerrich#page/n27/mode/2up "Theory and design of uniform and composite electric wave filters"], ''Bell System Technical Journal'', vol. 2 (1923), pp.&nbsp;1–46.</ref>

==References==
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[[Category:Telecommunications equipment]]