EP0387445A2 - Monopolantenne - Google Patents

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Publication number
EP0387445A2
EP0387445A2 EP89311450A EP89311450A EP0387445A2 EP 0387445 A2 EP0387445 A2 EP 0387445A2 EP 89311450 A EP89311450 A EP 89311450A EP 89311450 A EP89311450 A EP 89311450A EP 0387445 A2 EP0387445 A2 EP 0387445A2
Authority
EP
European Patent Office
Prior art keywords
antenna
cylinder
guy wires
mast
base cylinder
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.)
Withdrawn
Application number
EP89311450A
Other languages
English (en)
French (fr)
Other versions
EP0387445A3 (de
Inventor
Ivan Faigen
Charles Creaser
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.)
CHU ASSOCIATES Inc
Original Assignee
CHU ASSOCIATES Inc
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 CHU ASSOCIATES Inc filed Critical CHU ASSOCIATES Inc
Publication of EP0387445A2 publication Critical patent/EP0387445A2/de
Publication of EP0387445A3 publication Critical patent/EP0387445A3/de
Withdrawn legal-status Critical Current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
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/38—Vertical arrangement of element with counterpoise

Definitions

  • the present invention relates to communication antennas of the azimuthal omnidirectional type, being more particularly directed to such antennas adapted for mast-mounting and relatively broad banded to operate over a range of communication frequencies, such as, for example, in the 30 to 88 megahertz range.
  • the invention embraces an azimuthal omnidirectional communications mast-mounted antenna having, in combination, a monopole antenna encased in a dielectric cylinder, a conductive base cylinder securable to a mast and into which the dielectric cylinder is inserted and secured, a plurality of conductive wires symmetrically disposed about and radially depending at an acute angle from the outer surface of the base cylinder in the form of guy wires conically distributed about the base cylinder and mast and connected at their free ends to guy rope extensions for anchoring the antenna and mast, means for establishing electrical connection of the inner ends of the guy wires to the base cylinder, and coaxial conductor means, the inner conductor of which connects to the monopole antenna near the base of the dielectric cylinder and the outer conductor of which connects to the base cylinder, the length of the guy wires being adjusted to about one quarter of the wavelength of the communication frequency(ies) so that the guy wires serve also simultaneously as an elevated radial ground plane or counter
  • an antenna A as of the monopole type is shown encased within a fiberglass or other dielectric cylindrical housing H, the lower end of which is inserted within a conductive base cylinder or casting B, as of aluminum, for example, to the inner walls of which the lower part of the housing H is secured as at S, such as by glue.
  • conducting metal guy wires G are provided symmetrically disposed about and radially depending at an acute angle from the outer surface of the base cylinder B in the form of a conically distributed arrangement that envelops about the base cylinder B and the mast M, to which the same may be secured as by a latch clamp L.
  • the guy wires are shown having inner end loops 1 for structurally connecting into apertures in conductive ears 3 at symmetrically spaced points about the conductive base cylinder B, shown as at 90-degree positions in Fig. 2.
  • the metallic radial guy wires G do not just serve as guy supports for the antenna-base-mast structure, but also as electrical ground plane or counterpoise elements which is made possible by electrically conductive connectors 5 making good electrical connection between the metallic guys G and the conductive ears 3 of the conductive base B, as more particularly shown in Fig. 1.
  • the length of the elements G for the electrical purposes they serve, as distinguished from the structural guying purposes, are made approximately one quarter of the wavelength of the communication frequency or frequencies to be used, as is the vertical length of the antenna A.
  • the inner conductor of a coaxial feed line connects with the antenna A at a bottom edge thereof as at I, and the outer conductor connects with the ground base cylinder B.
  • the antenna A may be a planar monopole sheet and it may be curved into cylindrical C-shape form within the outer fiberglass housing A (and about an inner fiberglass tube, if desired).
  • the inner conductor of the coaxial line I will again connect with the bottom end of the antenna A′ through a matching network N shown disposed within the base cylinder B, again with the outer cylinder capacitively coupled to the antenna and feedline and connected to the outer conductor O of the coaxial line.
  • the metallic guy wires G serve not only for guying support of the structure, but simultaneously as an elevated radial ground plane or surface or counterpoise for the antenna, provided the remainder of the guying elements are non-conductive guy ropes anchoring the structure to the ground or other surface as shown at R.
  • the free ends of the metallic guy elements G are therefore provided with further loops 1′ that loop with rope guys R that extend to the ground, permitting the guy wires G to serve a guying function only for their length as a segment of the total guying structure, and having appropriate electrical length, as before stated, simultaneously to serve as an effective ground plane or surface for the antenna.
  • a variation in the acute angle of the symmetrically disposed guy segments G with respect to the vertical mast can play a desirable role in tilting the elevational radiation pattern of the omnidirectional antenna.
  • an antenna constructed as shown in the embodiment of Fig. 1 and operating at 30 megahertz with an acute angle of the guy wire G of 30 degrees to the vertical mast, a symmetrical doughnut shaped radiation pattern has been achieved, with the horizon being the symmetrical axis thereof in the vertical plane.
  • the predetermined length of the elements G caused a ten degree downward tilt in the elevational pattern; and at 88 megahertz, about a ten degree upward tilt.
  • While the plurality of combined guy wire-ground plane elements G of Fig. 2 is illustrated in the form of four radial spokes, further variations are possible and useful, including the four-sided star of Fig. 3, which, though made of wire elements, in view of the wavelengths involved, has been found to act as if they were solid sheets in terms of broad-banding and affecting the radiation pattern and impedance matches of the system.

Landscapes

  • Details Of Aerials (AREA)
  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP19890311450 1989-03-16 1989-11-06 Monopolantenne Withdrawn EP0387445A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32443189A 1989-03-16 1989-03-16
US324431 1989-03-16

Publications (2)

Publication Number Publication Date
EP0387445A2 true EP0387445A2 (de) 1990-09-19
EP0387445A3 EP0387445A3 (de) 1991-03-20

Family

ID=23263552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890311450 Withdrawn EP0387445A3 (de) 1989-03-16 1989-11-06 Monopolantenne

Country Status (3)

Country Link
EP (1) EP0387445A3 (de)
CA (1) CA2010950A1 (de)
IL (1) IL93525A0 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6084549A (en) * 1997-06-25 2000-07-04 Telefonaktiebolaget Lm Ericsson Retractable tripod antenna
NO325261B1 (no) * 2005-05-06 2008-03-17 Norsk Hydro As Forankringsarrangement for flytende vindturbininstallasjoner.
IT201700083954A1 (it) * 2017-07-24 2019-01-24 Hi Te S R L Antenna ricetrasmittente compatta a larga banda

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH474164A (fr) * 1968-01-02 1969-06-15 Thomson Houston Comp Francaise Antenne pylône quart-d'onde pour l'émission d'ondes radio-électriques longues et moyennes
JPS5624818A (en) * 1979-08-06 1981-03-10 Denki Kogyo Kk Transmitting antenna for medium wave radio broadcast
US4598296A (en) * 1984-07-31 1986-07-01 Chu Associates, Inc. Dipole antenna system with overhead coverage having equidirectional-linear polarization

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH474164A (fr) * 1968-01-02 1969-06-15 Thomson Houston Comp Francaise Antenne pylône quart-d'onde pour l'émission d'ondes radio-électriques longues et moyennes
JPS5624818A (en) * 1979-08-06 1981-03-10 Denki Kogyo Kk Transmitting antenna for medium wave radio broadcast
US4598296A (en) * 1984-07-31 1986-07-01 Chu Associates, Inc. Dipole antenna system with overhead coverage having equidirectional-linear polarization

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NHK LABORATORIES NOTE, no. S-2, June 1965, pages 1-44; K. ENDO et al.: "A method of exciting a medium-wave broadcast antenna with arbitrarily desired current distribution" *
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 74 (E-57)[746], 16th May 1981; & JP-A-56 24 818 (DENKI KOGYO K.K.) 10-03-1981 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6084549A (en) * 1997-06-25 2000-07-04 Telefonaktiebolaget Lm Ericsson Retractable tripod antenna
NO325261B1 (no) * 2005-05-06 2008-03-17 Norsk Hydro As Forankringsarrangement for flytende vindturbininstallasjoner.
IT201700083954A1 (it) * 2017-07-24 2019-01-24 Hi Te S R L Antenna ricetrasmittente compatta a larga banda
WO2019021185A1 (en) * 2017-07-24 2019-01-31 Hi-Te S.R.L. COMPACT BROADBAND ANTENNA

Also Published As

Publication number Publication date
CA2010950A1 (en) 1990-09-16
EP0387445A3 (de) 1991-03-20
IL93525A0 (en) 1990-11-29

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