Turnstile Antenna

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turnstile antenna

[′tərn‚stīl an‚ten·ə]
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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
B., "The turnstile antenna. An omni-directional horizontally polarized antenna," http://www.cebik.com/turns.html.
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