GB749303A - Antennas - Google Patents

Antennas

Info

Publication number
GB749303A
GB749303A GB2481551A GB2481551A GB749303A GB 749303 A GB749303 A GB 749303A GB 2481551 A GB2481551 A GB 2481551A GB 2481551 A GB2481551 A GB 2481551A GB 749303 A GB749303 A GB 749303A
Authority
GB
United Kingdom
Prior art keywords
elements
antenna elements
unit
producing
plane
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
Application number
GB2481551A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2481551A priority Critical patent/GB749303A/en
Publication of GB749303A publication Critical patent/GB749303A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems
    • H01Q21/24Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

749,303. Aerials. STANDARD TELEPHONES & CABLES, Ltd. (Federal Telecommunication Laboratories). Oct. 24, 1951, No. 24815/51. Class 40 (7). An antenna for producing substantially circularly polarized waves comprises a plurality of antenna elements forming a substantially closed figure in a given plane capable of producing waves polarized in that plane, other antenna elements co-operating with the first antenna elements capable of producing waves polarized in a plane perpendicular to the first plane, and a pair of metal plates between which the elements are all located for producing a quadrature phase relation between the electric fields of the waves from said elements. A complete aerial may comprise three stacked units 1, 2, 3, supported by a tubular metal mast 29 which may be used as the outer of a coaxial feeder for the aerial. The first antenna elements of each unit may comprise horizontal dipole elements 5a, 5b, 6a, 6b, 7a and 7b, each of which forms part of a circle gapped at 11, 12, 13, 14, 15 and 16 and supported from central metallic hub 4 by means of arms 8a, 8b, 9a, 9b, 10a and 10b. The elements 5a, 6a and 7a have threaded therethrough bolts 17, 18 and 19 which extend inwards through holes in the hub 4 and mast 29 to make contact with, or capacitatively couple to, the central conductor 23 of the feeder. Each of the horizontal dipole elements has attached to it (through the holes shown in Fig. 2) a pair of vertical dipole elements symmetrically arranged with respect to the axis of the unit and preferably a quarter wavelength long. Rigidly fastened to the mast on each side of the antenna elements are annular members 31, 32, 33, 34 supporting circular metal plates 35, 36, 37, 38. The vertical spacing and diameter of these plates is chosen so that the vertical and horizontal electric field components are at 90 degree phase difference in the case of each unit 1, 2 and 3; the space between the plates acting as a wave-guide. More or less than three circular dipples may be used to form the first elements and a cylindrical protective housing 39 of a material capable of passing the electric and magnetic fields may be provided for each unit. Specification 611,736 is referred to.
GB2481551A 1951-10-24 1951-10-24 Antennas Expired GB749303A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2481551A GB749303A (en) 1951-10-24 1951-10-24 Antennas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2481551A GB749303A (en) 1951-10-24 1951-10-24 Antennas

Publications (1)

Publication Number Publication Date
GB749303A true GB749303A (en) 1956-05-23

Family

ID=10217673

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2481551A Expired GB749303A (en) 1951-10-24 1951-10-24 Antennas

Country Status (1)

Country Link
GB (1) GB749303A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890117A (en) * 1987-01-20 1989-12-26 National Research Development Corporation Antenna and waveguide mode converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890117A (en) * 1987-01-20 1989-12-26 National Research Development Corporation Antenna and waveguide mode converter

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