Turnstile Antenna


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turnstile antenna

[′tərn‚stīl an‚ten·ə]
(electromagnetism)
An antenna consisting of one or more layers of crossed horizontal dipoles on a mast, usually energized so the currents in the two dipoles of a pair are equal and in quadrature; used with television, frequency modulation, and other very-high-frequency or ultra-high-frequency transmitters to obtain an essentially omnidirectional radiation pattern.

Turnstile Antenna

 

a complex multiple-section antenna, each section of which consists of a crossed pair of horizontal and symmetrical half-wave dipoles that are normal to each other and fastened to a common vertical mast. The number of sections in a turnstile antenna usually ranges from one to several tens. The dipoles of each pair are energized so that the currents in the two dipoles are equal but out of phase by 90°. Such energizing results in a nearly circular radiation pattern in the horizontal plane.

Turnstile antennas are used in television and in radio broad casting, mainly as transmitting antennas in the meter wavelength range. In television, turnstile antennas with broadband dipoles shaped like two K’s drawn back to back are often used (see: Figure 10).

References in periodicals archive ?
Highlights at the Jampro stand will include its JAT-U UHF broadband super turnstile antenna, JUHD UHF broadband panel antenna, JVD UHF Antenna, JUED and JUCD elliptical/circular polarised broadband UHF panel antennas, and its family of RCEC affordable mask filters.
Highlights will include the long-life JAT-U UHF broadband super turnstile antenna, JUHD UHF broadband panel antenna, which can be configured to provide various azimuth and elevation patterns, the economical and compact Prostar JA/MS-BB broadband UHF slot antenna and the affordable RCEC affordable mask filter.