US2512511A - Radio antenna - Google Patents

Radio antenna Download PDF

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Publication number
US2512511A
US2512511A US791821A US79182147A US2512511A US 2512511 A US2512511 A US 2512511A US 791821 A US791821 A US 791821A US 79182147 A US79182147 A US 79182147A US 2512511 A US2512511 A US 2512511A
Authority
US
United States
Prior art keywords
radiating elements
mast
radio antenna
elements
spaced
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US791821A
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English (en)
Inventor
Weighton Donald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pye Electronic Products Ltd
Original Assignee
Pye Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pye Ltd filed Critical Pye Ltd
Application granted granted Critical
Publication of US2512511A publication Critical patent/US2512511A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre

Definitions

  • This invention relates to a radio antenna for the transmission or reception of short waves, and has for its object to provide an antenna for hori-- zontally or vertically polarised waves with a substantially circular radiation pattern in the horizontal plane and a horizontally directive pattern in the vertical plane.
  • the present invention provides an .antenna having a minimum of radiating elements and of which the feeder system is relatively simple.
  • the invention consists in a radio antenna comprising a plurality of radiating elements, which may be half Wave dipoles, which are disposed around and spaced from a central longitudinal axis, the radiating elements being spaced in the direction of said axis and at different radial angles with respect thereto, whereby the radiating elements are disposed around the axis in helical fashion.
  • a radio antenna comprising a plurality of radiating elements, which may be half Wave dipoles, which are disposed around and spaced from a central longitudinal axis, the radiating elements being spaced in the direction of said axis and at different radial angles with respect thereto, whereby the radiating elements are disposed around the axis in helical fashion.
  • a feature of the invention consists in a radio antenna wherein the radiating elements, which may be half wave length dipoles, are supported on struts radiating from a central tower or mast which carries the main feeder with which the aerial is excited, the radiating elements being spaced along the length of the tower or mast with consecutive radiating elements disposed in different angular position around the tower or mast in helical fashion.
  • the radiating elements are preferably spaced by a distance of a quarter wave length from the central axis or mast and the radial angle between two adjacent radiating elements is made proportional to their longitudinal spacing relative to the wave length. Thus if the radiating elements are spaced at distances of a quarter wave length along the axis, each will be angularly disposed at 90 with respect to the next adjacent radiating elements.
  • FIG. 1 An embodiment according to the invention is illustrated in the accompanying drawing which shows a transmitting or receiving aerial for horizontally polarised Waves in which the radiation is concentrated in a horizontal direction with a substantially circular radiation pattern measured in a horizontal plane.
  • the rods or wires I, 2, 3 etc. are horizontally radiating elements which may be half wave length dipoles fed at their centre points. Each element is supported on a strut about one quarter of a wavelength long from a central tower or mast 200 carrying the main feeder with which the aerial is excited.
  • the vertical spacing between adjacent radiating elements is one quarter of a wavelength, and the feeders from each 2 element are connected to the main feeder at points IUI, I02, I03 etc., where the struts are fixed to the mast.
  • phase angles of the currents in the radiating elements are 0", 270 etc, with reference to the element I.
  • the elements I, 5, etc., lying in the same vertical plane are therefore excited in phase and in opposite phase with respect to the elements 3, etc., which lie in a parallel vertical plane spaced at a horizontal distance of one half wavelength from the plane containing the elements I, 5, etc.
  • the radiation from all these elements is therefore additive in a horizontal direction.
  • the radiation from the even numbered elements is additive in a horizontal direction but in phase quadrature and at right angles to that of the odd numbered elements. The whole therefore combines to produce a radiation pattern which is substantially circular in a horizontal plane.
  • the radiating elements may be vertical and produce vertically polarised waves with similar radiation pattern in the horizontal plane.
  • Radio antenna comprising a plurality of radiating elements which are supported on struts projecting from a central mast which carries the main feeder with which the aerial is excited, the radiating elements being spaced by a distance of a quarter wavelength from the central mast and being spaced from one another along the length of the mast by the distance of a quarter wavelength with consecutive radiating elements disposed in different angular positions in helical fashion, each radiating element being angularly disposed at 90 with respect to the next adjacent radiating element.
  • Radio antenna comprising a central mast serving as the main feeder with which the aerial is excited, a plurality of quarter-wave struts projecting radially from the central mast and spaced from one another along the direction of the mast by a distance of a quarter wavelength, each strut projecting from the mast in a radial direction which is angularly disposed at 90 with respect to the next adjacent strut, and a half wave dipole mounted on the end of each strut.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
US791821A 1946-12-20 1947-12-15 Radio antenna Expired - Lifetime US2512511A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB37478/46A GB624527A (en) 1946-12-20 1946-12-20 Radio antenna

Publications (1)

Publication Number Publication Date
US2512511A true US2512511A (en) 1950-06-20

Family

ID=10396777

Family Applications (1)

Application Number Title Priority Date Filing Date
US791821A Expired - Lifetime US2512511A (en) 1946-12-20 1947-12-15 Radio antenna

Country Status (3)

Country Link
US (1) US2512511A (fr)
FR (1) FR957443A (fr)
GB (1) GB624527A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757371A (en) * 1951-03-08 1956-07-31 Andrew Corp Vertically polarized antenna
US2947988A (en) * 1955-03-29 1960-08-02 Univ Ohio State Res Found Traveling wave antenna
EP1739790A1 (fr) * 2005-06-24 2007-01-03 Antennessa Elément d'antenne omnidirectionnelle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2298449A (en) * 1941-11-08 1942-10-13 Bell Telephone Labor Inc Antenna
US2444320A (en) * 1944-08-10 1948-06-29 Rca Corp Antenna system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2298449A (en) * 1941-11-08 1942-10-13 Bell Telephone Labor Inc Antenna
US2444320A (en) * 1944-08-10 1948-06-29 Rca Corp Antenna system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757371A (en) * 1951-03-08 1956-07-31 Andrew Corp Vertically polarized antenna
US2947988A (en) * 1955-03-29 1960-08-02 Univ Ohio State Res Found Traveling wave antenna
EP1739790A1 (fr) * 2005-06-24 2007-01-03 Antennessa Elément d'antenne omnidirectionnelle

Also Published As

Publication number Publication date
FR957443A (fr) 1950-02-20
GB624527A (en) 1949-06-10

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