US3286269A - Antenna - Google Patents

Antenna Download PDF

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Publication number
US3286269A
US3286269A US343711A US34371164A US3286269A US 3286269 A US3286269 A US 3286269A US 343711 A US343711 A US 343711A US 34371164 A US34371164 A US 34371164A US 3286269 A US3286269 A US 3286269A
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US
United States
Prior art keywords
metal
antenna
cylindrical portion
cylinder
netting
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
US343711A
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English (en)
Inventor
Cramner Karl Torbjorn
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3286269A publication Critical patent/US3286269A/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
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/40—Element having extended radiating surface

Definitions

  • This invention relates to a quarter-wave antenna of the ground surface type and refers more particularly to a quarter wave antenna of glass fiber construction with an extremely wide band.
  • f f It is very desirable to use antennaswitha wide band for certainy radio communication ranges.' i
  • the band width of antennasV of this type canv be increased by using sender elements .and ground surface elements having 4the greatest possible diameters.v
  • The-sizeV of these diameters is” limited, however, partly by the fact that the ratio between the length and the diameter of the elementsH must not ex# ceed a certain value, and partly because the wind resistance land the weight may become too great. ⁇
  • An object of the present invention is ready Within a permissible range.
  • a coaxial antenna cable has an inner conduit connected to the feed point of the metal netting and an outer conduit connected to that part of the metal tube which is directed toward the feed point.
  • FIGURE l is a vertical section through an antenna constructed in accordance with the principles of the present invention.
  • FIGURE 2 shows a part of the antenna in cross section on an enlarged scale.
  • the antenna shown in the drawing is mounted upon a support consisting of a metal pipe 10 the upper end of which is provided with a collar 12.
  • a round metal disc 14 is xed upon the collar 12; a surface of the disc 14 extends conically outwardly so as to facilitate the attachment of a number of ground surface elements 16.
  • the elements 16 are screwed into the disc 14 and can be easily removed and exchanged, so as to facilitate the transport-ation, assemblage and servicing of the antenna, as well as the changing of its wave length range.
  • the elements 16 consist preferably of metal tubes closed on all sides, and are fgalvanically connected with the grounded support 10.
  • the upper side of the disc 14 has a round centrally located recess 18.
  • a bottom plate 20 is mounted in the recess 18 and is fixed to the disc 14 by screws.
  • a tubular thin-walled metal cylinder 22 has the lower end thereof secured to the outer surfaces of the plate ⁇ 2.0 preferably by welding or hard soldering and is abutting the adjacent surfaces of the recess 18 of the plate 14.
  • the upper end of the cylinder 22 is Igalvanically connected with a 'sender or receiver element 24 of the antenna.
  • the element 24 consists of a rigid body having an inner portion 26 made of a plastic material and carrying a metal netting 28 which in turn is covered by aplastic .layer 30.
  • the inner member 26, ⁇ the metal netting 28 and the outer I'plastic layer 30 are rmly united through the meshes of the netting 28 and thus constitute a single homogeneous body 24 of plastic material lwithin which the metal netting 28'is embedded.
  • the element l24 comprises a flat round top portion 32 and an integral cylindrical portion 34 joining the circumference of the top 32.
  • the lower end of the element 24 extends into an insulator 36 having the shape of an :annular plat with an upwardly extending circumferential flange 38.
  • the plate36 can be made of cast resin or other suitable material.
  • the flange 38 extends as a protective 'cover over the lower end of the element 24.
  • the inner circumferential surfaces of the insulator 36 are firmly conne'ctedwtih the ⁇ cylinder 22.
  • #1A coaxial cable v40 extends through the pipe 10 and through openings provided in the disc 14 and the plate 20.
  • the cable 40 passes through an opening in the lower portion of the cylinder 22 and the cylindrical outer con duit of the cable 40 is galvanically connected therein to the cylinder 22.
  • the inner conduit of the cable 40 is connected at 42 to the lower end of the metal netting 28.
  • the coaxial cable 40 connects the metal netting 28 with a sender or receiver (not shown)
  • the element 24 serves electrically as a quarter wave antenna which is fed lat its base point 42 and which has a wide band width due to its very large diameter relatively to its length.
  • the band width is further increased by the fact that the hollow space between the cylinder 22 andthe element 24 acts as a coaxial oscillating circuit or a coaxial resonator, the circuit capacity of which can be considered as being shifted to the portion of the element 24 at the feed point 42 and to the portion of the cylinder 22 located opposite this feed point; this assumption leaves 4out of consideration the fact that actually the circuit capacity is distributed along the cylindrical walls of -cylinder 22 and element 24 which face the hollow space therebetween, while the circuit inductance is formed by the conducting members in the cylindrical portion 34 and the upper portion 32 of the element 24 and the outer surface of the cylinder 22.
  • the coaxial circuit constituted by the cylinder 22 and the element 24 is connected in parallel with the feed point of the antenna, namely, the innei conductor (cylinder 22) of the coaxial circuit is connected with the ground surface elements, and the outer conductor (metal netting 28) of the coaxial circuit is connected with the feed point 42 of the netting 28 constituting a part of the element 24.
  • This parallel connection of the coaxial circuit with the element 24 causes a further drop or lowering of the resonance curve of the antenna, i.e., an increase in the band width.
  • the coaxial circuit can be also considered as representing a short circuited quarter Wave tap conduit with ysmall impedance due to large circuit capacity and comparatively small circuit iimpedance. Due to this arrangement the element 24 of the antenna has a double function, namely, its outer surface cooperates electromagnetical'ly with the space, while its inner surface constitutes a part of a coaxial resonator.
  • the construction of the present invention' has the advantage'that the radiation element is of light weight and yet stable and secure from corrosion, since the metal netting is embedded in plastic material.
  • the diameter of the radiation element can be adapted to a size which is best suited from the electrical point of view, which is not possible with commercially available metal tubes or metal rods.
  • a quarter wave antenna of the ground surface type 1.
  • mentioned outer conduit being electrically connected with.
  • a radiation element having a plastic cylindrical portion;t an integral substantially flat top portion closing saidcylindrical portion and a metal netting carriedby s aid portions and having a feed point, a thin-walled metal cylinder located within said element and spaced from the cylindrical portion thereof, whereby said metal cylinder and said metal netting constitute respectively the inner and outer conduits of a coaxial resonator, a plate-shaped insulator having circumferential surfaces firmly connected lwith a lower end' of said plastic cylindrical portion, said insulator being firmly connected with said metal cylinder, and a .coaxial antenna cable having an inner conduit and an outer conduit, the last-mentioned inner conduit being electrically connected with said metal netting at said feed point, the last-mentioned outer conduit being electrically connected with said metal cylinder at a location facing said feed point.
  • said cylindrical portion Vand. a metal netting carried by said portionsand having-'aV feed point, a thin-walled metal cylinder located within; 4said element andwspaced from the cylindrical portion thereof, whereby said metal cylinder and. said metal netting constitute respectively the innerand outer conduits of a coaxial resonator,a plate-shaped.
  • insulator having circumferential surfaces rmly connected with y.a lower eind of said plastic cylindrical portion, and a disc constituting the ground surface ofthe antenna, said insulator being xed to said disc, and a coaxial antenna cable having. an inner conduit and an outer conduit, the last-mentioned inner conduit being electrically connected withy said metal netting at said feed point, the last-mentioned .outer conduit being electrically connected with said n metal cylinderv at alocation facing said feed point. 35

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US343711A 1963-02-28 1964-02-10 Antenna Expired - Lifetime US3286269A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE221063 1963-02-28

Publications (1)

Publication Number Publication Date
US3286269A true US3286269A (en) 1966-11-15

Family

ID=20259560

Family Applications (1)

Application Number Title Priority Date Filing Date
US343711A Expired - Lifetime US3286269A (en) 1963-02-28 1964-02-10 Antenna

Country Status (5)

Country Link
US (1) US3286269A (pt)
BE (1) BE644094A (pt)
DK (1) DK110183C (pt)
GB (1) GB1034761A (pt)
NO (1) NO118073B (pt)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4208662A (en) * 1973-04-11 1980-06-17 Orion Industries, Inc. Omnidirectional, vertically polarized antenna
US11033433B2 (en) 2014-06-16 2021-06-15 Illinois Tool Works Inc Removable shield for protective headwear

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531476A (en) * 1947-04-28 1950-11-28 Farnsworth Res Corp Ultra high frequency antenna
US2624844A (en) * 1946-03-04 1953-01-06 Jessic A Nelson Broad band antenna

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624844A (en) * 1946-03-04 1953-01-06 Jessic A Nelson Broad band antenna
US2531476A (en) * 1947-04-28 1950-11-28 Farnsworth Res Corp Ultra high frequency antenna

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4208662A (en) * 1973-04-11 1980-06-17 Orion Industries, Inc. Omnidirectional, vertically polarized antenna
US11033433B2 (en) 2014-06-16 2021-06-15 Illinois Tool Works Inc Removable shield for protective headwear

Also Published As

Publication number Publication date
NO118073B (pt) 1969-11-03
GB1034761A (en) 1966-07-06
BE644094A (pt) 1964-06-15
DK110183C (da) 1969-12-29

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