Patent
Quadrifilar helix feed network
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TLDR
In this article, a radio antenna system consisting of a first balun having a feed line and two feed points with 180° phase differential there between for feeding one opposite arm pair, and a second balun with a feedline and two feeds with 180-degree phase difference between them for feeding the other opposite arm pairs is described.Abstract:
A radio antenna system having a quadrifilar antenna having four helical arms and a method of feeding the arms. The antenna system comprises a first balun having a feed line and two feed points with 180° phase differential therebetween for feeding one opposite arm pair, and a second balun having a feed line and two feed points with 180° phase differential therebetween for feeding the other opposite arm pair. The two feed lines are combined in a single combiner, which provides a 90° phase differential between the feed lines.read more
Citations
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Patent
Antenna and radio device comprising the same
Masahiro Ohara,Toyoshi Fukumura +1 more
TL;DR: In this paper, the dimensions of the generally spiral section and generally meandered section were determined, thereby realizing favorable impedance characteristics in frequency bands, and a radome of a dielectric covered the antenna element part and a part of the feeding part.
Patent
Dielectrically-loaded antenna
TL;DR: In this paper, a dielectrically loaded backfire helical antenna has a cylindrical ceramic core and a feed structure which passes axially through the core to a distal end face of the core where it is connected to helical conductors located on the outside.
Journal ArticleDOI
UHF Deployable Helical Antennas for CubeSats
Joseph Costantine,Youssef Tawk,Ignacio Maqueda,Maria Sakovsky,Gina Olson,Sergio Pellegrino,Christos G. Christodoulou +6 more
TL;DR: The design process and the deployment mechanism of a quadrifilar helix antenna (QHA) and a conical log spiral antenna (CLSA) and their potential deployment possibilities from CubeSats are investigated.
Journal ArticleDOI
The Miniaturization of a Partially 3-D Printed Quadrifilar Helix Antenna
TL;DR: In this article, the design and implementation of a quadrifilar helix antenna are presented where the four arms are 3-D printed and the antenna structure is miniaturized by resorting to a combination of two approaches.
Patent
Handset quadrifilar helical antenna mechanical structures
Gregory A. O'Neill,Young-Min Jo,Paul A. Tornatta,John Charles Farrar,Murray Fugate,Ki-chul Kim,Joon-Wan Lee +6 more
TL;DR: In this article, a quadrifilar helical antenna comprising two pairs of filars having unequal lengths and phase quadrature signals propagating thereon is considered, where a disk-like impedance matching element is employed at a lower end of the antenna to match a source impedance to an antenna impedance.
References
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Patent
Dual mode quadrifilar helix antenna and associated methods of operation
TL;DR: In this paper, a first antenna feed is coupled to the quadrifilar helix antenna for exciting the radiating elements in phase quadrature, and a second feed is also coupled to a second antenna feed to accelerate the system in phase.
Book
Fixed and mobile terminal antennas
TL;DR: Mobile satellite antennas antenna specifications and fixed terminal antennas propagation in the land mobile voice-link antennas noise temperature and G/T of mobile antennas.
Patent
Small helical antenna with non-directional radiation pattern
TL;DR: In this article, a small helical antenna with broad fan radiation pattern provides easy impedance matching and high radiation efficiency, and a plurality of feeder conductors arranged near the radiation conductors on the lower inner surface of the dielectric cylinder and lowering the impedance of the helical antennas.
Patent
Low-profile quadrature-plate UHF antenna
Frank Reggia,Howard S. Jones +1 more
TL;DR: In this paper, a low-profile UHF antenna comprises two orthogonally positioned parallel te radiators that are semi-circular in shape, and the base of each radiator (filled with dielectric material) is connected to a circular metal ground plane.
Patent
Antenna feeding circuit
TL;DR: In this paper, the authors present an antenna feeding circuit, in which micro-strips lines are constructed from one or more pair(s) of band conductors (5a, 5b) and an inner conductor 6 (6) disposed on the whole of the inner surface of the cylindrical body.