EP0252648A1 - Dipolantenne - Google Patents

Dipolantenne Download PDF

Info

Publication number
EP0252648A1
EP0252648A1 EP87305606A EP87305606A EP0252648A1 EP 0252648 A1 EP0252648 A1 EP 0252648A1 EP 87305606 A EP87305606 A EP 87305606A EP 87305606 A EP87305606 A EP 87305606A EP 0252648 A1 EP0252648 A1 EP 0252648A1
Authority
EP
European Patent Office
Prior art keywords
dipole
slot
arms
signal
wavelength
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Withdrawn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
EP87305606A
Other languages
English (en)
French (fr)
Inventor
Edmund Wergiliusz Woloszczuk
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.)
General Electric Co PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Publication of EP0252648A1 publication Critical patent/EP0252648A1/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Withdrawn legal-status Critical Current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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole

Definitions

  • This invention relates to dipoles.
  • a notch fed dipole is generally of the form shown in figure 1.
  • the radiating part of the dipole consists of two arms 1 and 2.
  • the length of each of the arms 1 and 2 is approximately equal to t wavelength of the intended transmitting frequency.
  • the arms 1 and 2 are separated by a slot 3 cut from the body 4 of the dipole. Slot 3 is approximately t of a wavelength deep and narrow relative to its depth.
  • a reflector, formed by a grounded conductive plane 5, is located approximately a quarter of a wavelength from dipole arms 1 and 2.
  • a signal to be transmitted is applied across slot 3. This is done using a co-axial cable 6, connecting the signal carrying central conductor 7 to one side of the slot 3 and the outer conductor 8 to the other. This signal will set up a resonance on dipole arms 1 and 2.
  • the present invention was made while attempting to produce a dipole overcoming these problems.
  • This invention provides a dipole comprising two arms separated by a slot, the two arms being electrically linked by a conductive path around the slot, each arm being ⁇ /4 long and the slot being ⁇ /2 deep, where x is a wavelength of radiation that the dipole is designed to receive or transmit.
  • Two dipoles of this type can be arranged perpendicular to one another to form a cross-dipole, such an arrangement can be used to produce a circularly polarised radiation or sensitivity pattern.
  • This structure provides a dipole with larger bandwidth than normal and a 50 ⁇ input impedance.
  • An input impedance of 50 ⁇ is desirable because it is the same impedance as a co-axial cable and so gives very good impedance matching.
  • the dipole is fed by a feed arranged to apply a signal between the two sides of the slot.
  • the dipole is fed with a signal to be radiated by a co-axial cable, the centre and outer of the cable being attached to the opposite sides of the slot at the same distance from the bottom of the slot.
  • said feed is arranged to apply a signal approximately half way up the slot.
  • the two arms may be made rectangular.
  • a reflector of a known type for example a conductive metal sheet, may be used to give the dipole a unidirectional radiation pattern. For the best results this reflector should be placed at the level of the bottom of the slot.
  • a conductive body 9 is shown, with a slot 10 cut from it.
  • the slot 10 is approximately t of an intended transmission wavelength deep and is narrow compared to its depth.
  • the width of slot 10 can be varied in order to alter the input impedance of the dipole.
  • Arms 11 and 12 each approximately t of an intended transmission wavelength long, are formed from conductive body 9 on either side of the slot 10.
  • the profile of arms 11 and 12 can be varied provided the top edge and the edges defining the slot 10 remain straight and the two arms are symmetrical about an axis running along the centre of the slot 10.
  • the profile of arms 11 and 12 could be altered to that shown by the pairs of dotted lines 17,18 or 19 for example.
  • a grounded conductive reflector 13 is placed at the level of the bottom of the slot 10.
  • the signal to be transmitted is fed to the slot, by a co-axial cable 14, the control conductor 15 and outer conductor 16 being connected to opposite sides of the slot 10, and as before a dipole resonance is set up.
  • the position at which the co-axial cable is connected can be varied up and down the slot. It is preferred to connect it approximately half way up the slot, because this forms a balun, the exact position can be adjusted in order to optimise the dipole impedance.
  • the dipole arms 11 and 12 could be made a multiple of of an intended transmission wavelength long, this would however alter the impedance. It was decided for simplicity and compactness to use arms only ; of an intended transmission wavelength long.
  • the profile of the arms can be widely varied it does affect the bandwidth, generally the smaller the arm area the narrower the bandwidth.

Landscapes

  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP87305606A 1986-07-08 1987-06-24 Dipolantenne Withdrawn EP0252648A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08616576A GB2192490A (en) 1986-07-08 1986-07-08 Notch-fed dipole
GB8616576 1986-07-08

Publications (1)

Publication Number Publication Date
EP0252648A1 true EP0252648A1 (de) 1988-01-13

Family

ID=10600712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87305606A Withdrawn EP0252648A1 (de) 1986-07-08 1987-06-24 Dipolantenne

Country Status (2)

Country Link
EP (1) EP0252648A1 (de)
GB (1) GB2192490A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0652604A1 (de) * 1993-11-09 1995-05-10 Harris Corporation Verbesserte Schlitzgespeiste Dipolantenne mit variabler Länge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5900843A (en) * 1997-03-18 1999-05-04 Raytheon Company Airborne VHF antennas

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2883664A (en) * 1953-07-03 1959-04-21 Sloppy Milton Roy Antenna structure with coupling network
GB974217A (en) * 1959-12-28 1964-11-04 Wolsey Electronics Ltd Improvements in or relating to aerial arrays
GB1348478A (en) * 1970-06-20 1974-03-20 Emi Ltd Aerial arrangements
US3845490A (en) * 1973-05-03 1974-10-29 Gen Electric Stripline slotted balun dipole antenna
US4498085A (en) * 1982-09-30 1985-02-05 Rca Corporation Folded dipole radiating element

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB233346A (en) * 1924-04-29 1926-07-29 Lucien Levy Improvements in or relating to directive aerials
GB664150A (en) * 1949-01-10 1952-01-02 British Broadcasting Corp Improvements in and relating to slot aerials

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2883664A (en) * 1953-07-03 1959-04-21 Sloppy Milton Roy Antenna structure with coupling network
GB974217A (en) * 1959-12-28 1964-11-04 Wolsey Electronics Ltd Improvements in or relating to aerial arrays
GB1348478A (en) * 1970-06-20 1974-03-20 Emi Ltd Aerial arrangements
US3845490A (en) * 1973-05-03 1974-10-29 Gen Electric Stripline slotted balun dipole antenna
US4498085A (en) * 1982-09-30 1985-02-05 Rca Corporation Folded dipole radiating element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0652604A1 (de) * 1993-11-09 1995-05-10 Harris Corporation Verbesserte Schlitzgespeiste Dipolantenne mit variabler Länge

Also Published As

Publication number Publication date
GB8616576D0 (en) 1986-08-13
GB2192490A (en) 1988-01-13

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Legal Events

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Effective date: 19880509

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18D Application deemed to be withdrawn

Effective date: 19900103

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Inventor name: WOLOSZCZUK, EDMUND WERGILIUSZ