An axial-mode turnstile antenna for 136-137 MHz to receive data from weather satellites, consisting of a pair of driven crossed dipoles above a pair passive crossed dipoles serving as a reflector.
High gain axial mode Yagi turnstile array used to communicate with weather satellites on 136-137 MHz at Redu, Belgium. Each of the 6 components of the array consists of two 9-element Yagi antennas mounted on the same axis at right angles and fed in quadrature to radiate a narrow beam of circularly polarized radio waves
A turnstile antenna, or crossed-dipole antenna,[1] is a radio antenna consisting of a set of two identical dipole antennas mounted at right angles to each other and fed in phase quadrature; the two currents applied to the dipoles are 90° out of phase.[2][3] The name reflects the notion the antenna looks like a turnstile when mounted horizontally. The antenna can be used in two possible modes. In normal mode the antenna radiates horizontally polarized radio waves perpendicular to its axis. In axial mode the antenna radiates circularly polarized radiation along its axis.
Specialized normal mode turnstile antennas called superturnstile or batwing antennas are used as television broadcasting antennas. Axial mode turnstiles are widely used for satellite ground station antennas in the VHF and UHF bands, as circular polarization is often used for satellite communication since it is not sensitive to the orientation of the satellite antenna in space.
^Milligan, Thomas (2005). "5 - Dipoles, Slots and Loops". Modern Antenna Design (2nd ed.). Hoboken, New Jersey: John Wiley & Sons, Inc. pp. 231–237. ISBN 978-0-471-45776-3.
^Brown, George. "US Patent 2086976". Antenna system. Retrieved 14 January 2014. filed: September 20, 1935; granted: July 13, 1937
^Kraus, John (1988). "16: Antennas for Special Applications: Feeding Applications". Antennas (2nd ed.). McGraw-Hill, Inc. pp. 726–729. ISBN 0-07-035422-7.
A turnstileantenna, or crossed-dipole antenna, is a radio antenna consisting of a set of two identical dipole antennas mounted at right angles to each...
A batwing or super turnstileantenna is a broadcasting antenna used at VHF and UHF frequencies, named for its distinctive shape resembling a bat wing...
composite antennas such as Yagi antennas or turnstileantennas. Collinear array – a broadside array consisting of multiple identical dipole antennas oriented...
circular polarization. The batwing antenna is a turnstileantenna with its linear elements widened as in a bow-tie antenna, again for the purpose of widening...
be 9× more efficient. Turnstile Two dipole antennas mounted at right angles, fed with a phase difference of 90°. This antenna is unusual in that it radiates...
The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. It takes its name from...
this antenna in 1946. It is very popular in the United States. The antenna can be erected as horizontal dipole, as sloper, or an inverted-V antenna. With...
applied being 90 degrees out of phase. Nicknamed a "turnstileantenna" as the antenna resembles a turnstile when viewed horizontally. Commonly used in FM broadcasting...
antenna. For television reception, the Yagi is used, as well as the log-periodic antenna due to its wider bandwidth. Helical and turnstileantennas are...
distinction arises solely from different desirable radiation patterns of the antennas (near vertical for NVIS, near horizontal for conventional long-range skywave...
array antennas. At the top end of the band, slot antennas and parabolic dishes become practical. For satellite communication, helical and turnstile antennas...
The Sloper Antenna is a slanted Dipole antenna. While horizontal dipoles required two large support masts, this antenna type only needs one large mast...
as antennas based on them such as the whip antenna, T antenna, mast radiator, Yagi, log periodic, and turnstileantennas. These are resonant antennas, in...
satellite operating on 108.03 MHz, and four flexible whips forming a turnstileantenna were fed by a 10 milliwatt transmitter operating on 108.00 MHz. Because...
fed into a crossed-dipole antenna, known as a "turnstileantenna", that had been developed by RCA's Dr. G. H. Brown. The antenna was mounted on a 70-foot...
along with an amplifier, a 50 mW transmitter, voltage control, a turnstileantenna, and six silver-cadmium batteries capable of operating the lunar capsule...
with an amplifier, a 50-milliwatt transmitter, voltage control, a turnstileantenna, and six silver-cadmium batteries capable of operating the lunar capsule...
experiments; A 37 m (121 ft) electric dipole antenna used by scientific experiments; A cross-dipole turnstileantenna for the transmission of telemetry on a...
the central section of the structure, served as the elements of a turnstileantenna system. 18 solar sensors were mounted pointing parallel to the spin...
to produce an antenna with omnidirectional radiation, i.e. equal at all points of the compass, led him to develop the turnstileantenna, so-called because...
along with an amplifier, a 50 mW transmitter, voltage control, a turnstileantenna, and six silver-cadmium batteries capable of operating the lunar capsule...
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