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{{Short description|Electrical circuits composed of lengths of transmission lines or other distributed components}}
[[File:LNB circuit.jpg|thumb|upright=1.5|alt=Satellite-TV block-converter circuit board|A [[low-noise block converter]] with distributed element circuitry. The circuitry on the right is [[lumped element]]. The distributed element circuitry is centre and left of centre, and is constructed in [[microstrip]].]]
'''Distributed element circuits''' are electrical circuits composed of lengths of [[transmission line]]s or other distributed components. These circuits perform the same functions as conventional circuits composed of [[Passivity (engineering)|passive]] components, such as [[capacitor]]s, [[inductor]]s, and [[transformer]]s. They are used mostly at [[microwave]] frequencies, where conventional components are difficult (or impossible) to implement.
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