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→top: Please read the recent added ref. which states clearly that most of this article is not about log-periodic antennas (doesn't even explain principle!) but about the LPDA and should be called that. The material actually about log-periodic antennas should be moved, I will help if anyone wants to start a page Log-periodic and frequency-independent antennas |
m Dating maintenance tags: {{Dubious}} |
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{{Antennas|expanded=Common Types}}
A '''log-periodic antenna''' ('''LP'''), also known as a '''log-periodic array''' or '''log-periodic aerial''', is{{dubious|date=June 2018}} a multi-element, [[directional antenna|directional]] [[antenna (radio)|antenna]] designed to operate over a wide band of [[Frequency|frequencies]]. It was invented by [[Dwight Isbell]] and Raymond DuHamel at the [[University of Illinois at Urbana–Champaign|University of Illinois]] in 1958.
The most common form of log-periodic antenna is the '''log-periodic dipole array''' or '''LPDA''', The LPDA consists of a number of [[half-wave dipole]] [[driven element]]s of gradually increasing length, each consisting of a pair of metal rods. The dipoles are mounted close together in a line, connected in parallel to the [[feedline]] with alternating [[phase (waves)|phase]]. Electrically, it simulates a series of two or three-element [[Yagi antenna]]s connected together, each set tuned to a different frequency.
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