WO2001080358A1 - Antenne - Google Patents

Antenne Download PDF

Info

Publication number
WO2001080358A1
WO2001080358A1 PCT/GB2001/001665 GB0101665W WO0180358A1 WO 2001080358 A1 WO2001080358 A1 WO 2001080358A1 GB 0101665 W GB0101665 W GB 0101665W WO 0180358 A1 WO0180358 A1 WO 0180358A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
feed
coupled
element according
feed member
Prior art date
Application number
PCT/GB2001/001665
Other languages
English (en)
Inventor
Simon Reza Saunders
Panomporn Suvannapattana
Original Assignee
University Of Surrey
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 University Of Surrey filed Critical University Of Surrey
Priority to AU93356/01A priority Critical patent/AU9335601A/en
Publication of WO2001080358A1 publication Critical patent/WO2001080358A1/fr

Links

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
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • 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
    • 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
    • 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
    • H01Q9/06—Details
    • H01Q9/065—Microstrip dipole antennas
    • 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

Definitions

  • This invention relates to an antenna which is intended particularly though not exclusively, for compact operation with a mobile handset in a mobile terrestrial or satellite system or as a small antenna for communicating with a satellite.
  • an antenna element comprising a set of generally coplanar elongate conductive members coupled in series, the set including a feed member for receiving an antenna feed, a first member coupled to the feed member and extending generally at right angles to the feed member and a second member coupled to the distal end of the first member.
  • Figure 1 is a schematic plan view of an element of an antenna
  • Figure 2 is a schematic plan view of a plurality of the elements of Figure 1 arranged to form an antenna;
  • Figure 3 A is a schematic perspective view of a modified form of the antenna of Figure 2;
  • Figure 3B is a schematic perspective view of a modified form of the antenna of Figure
  • Figure 4 is a plot of standing wave ratio against frequency for antenna of figure 3 A and 3B
  • Figure 5 A is a polar plot of antenna normalized gain for the antenna of Figure 3 A and 3B when coupled to produce left-hand circular polarisation
  • Figure 5B is a polar plot of antenna no ⁇ nalized gain for the antenna of Figure 3 A and 3B when coupled to produce right-hand circular polarisation;
  • Figure 6 is a polar plot of the antenna normalized gain through the vertical axis of the antenna of Figure 3A and 3B when used in conjunction with a ground plane;
  • Figure 7A is a schematic view of a modified form of the antenna of Figure 2;
  • Figure 7B is a schematic plan view of a plurality of the elements of Figure 7 A arranged to form an antenna;
  • Figure 8 A is a schematic perspective view of an antenna array formed from two antennas of the type shown in Figure 7B and having a metallic patch load coupled to each element of each antenna ;
  • Figure 8B is a schematic perspective view of the lower antenna array of Figure 8 A and having an alternative metallic patch load coupled to each element of the antenna;
  • Figure 9A is a polar plot of antenna no ⁇ nalized gain in the vertical plane for the antenna array of Figure 8 A coupled to produce co-polar left-hand circular polarisation;
  • Figure 9B is a polar plot of antenna no ⁇ nalized gain in the vertical plane for the antenna array of Figure 8 A coupled to produce cross-polar right-hand circular polarisation;
  • Figure 9C is a polar plot of antenna nonnalized gain in the horizontal plane for the antenna array of Figure 8 A coupled to produce co-polar right-hand circular polarisation;
  • Figure 10 is a feed network for the antenna a ⁇ ay of Figure 8 A;
  • Figure 11A is a schematic side elevation of an alternative fo ⁇ n of the antenna of Figure 7B;
  • Figure 1 IB is a schematic perspective view of the antenna of Figure 11A;
  • Figure 11C is a schematic plan view of the antenna of Figure 11A;
  • Figure 12A is a polar plot of the vertical no ⁇ nalized gain radiation pattern of the antenna of Figures 11 A, 1 IB and 11C coupled to produce left-hand circular polarisation;
  • Figure 12B is a polar plot of the vertical no ⁇ nalized gain radiation pattern of the antenna of Figures 11 A, 11B and 11C coupled to produce cross-polar right-hand circular polarisation.
  • Figure 1 shows a single element which may be used to build an antenna as described below.
  • the element has a feed member 2, a first member 4 and a second member 6.
  • An intermediate feed member 8 extends in the same direction as the feed member 2 and is wider than the feed member 2.
  • the first member preferably extends at right-angles to the feed member 2.
  • the second member 6 preferably makes an acute angle ⁇ with the first member 4.
  • the antenna of Figure 2 is formed form four conducting elements A,B,C and D of the type shown in Figure 1.
  • the elements A, B, C and D are arranged in the same plane and equiangularly around a central feed 10.
  • the elements B, C and D are fed with a consecutive 90 degree phase lag (relative to the feed for element A) in a clockwise order to produce left-hand circular polarisation out of the plane of the drawing.
  • the antenna may be fed with a 90 degree phase lag in the anti-clockwise direction in which case the polarisation is right-hand circular.
  • the antenna may, for example, be constructed from wire or (as will be described below) may be printed on a dielectric substrate.
  • the resonant frequency and impedance bandwidth of the antenna may be varied by changing the total length of each element of the antenna and/or by adding a metallic load 12 at the distal end of each element as shown in Figure 3 A.
  • the metallic load can be altered, for example, to increase the impedance bandwidth such as shown in Figure 3B.
  • the metallic loads 12' comprise a small patch 14 in the plane of the antenna and semi-circles 16 extending normal to the plane of the antenna.
  • the path followed by the semicircles 16 is, in plan, similar to that of the metallic loads 12 of Figure 3 A.
  • Figure 4 shows that it is resonant at a frequency of 2.14GHz and has a bandwidth for a standing wave ratio better than 2:1 of 11%.
  • Figures 5 A and 5B show the no ⁇ nalised gain of the antennas of Figures 3 A and 3B.
  • the element of Figure 7 A is based on that of Figure 1.
  • This modified element has first and second members 4' and 6', a feed member 2' and an intermediate feed member 8'.
  • the modified element has an intermediate member 18 coupled between the first and second members 4' and 6' and a third member 20 coupled to the distal end of the second member 6'.
  • the two additional members extend generally parallel to the feed member 2'.
  • the feed member 2' and the intermediate feed member 8' are of the same width.
  • the third member 20 may be wider than the intennediate member 18.
  • the angle a between the intermediate portion 18 and the second portion 6' may be any angle but is preferably acute as shown.
  • the modified elements may be a ⁇ anged in the same way as the elements shown in Figure 2, to produce an antenna array of the type shown in Figure 7B
  • each antenna is aligned on a line passing generally orthogonally through a plane parallel to those of the antenna elements and have patch loads 12" which extend about 18mm (for the plots shown in Figures 9A, 9B and 9C) towards each array.
  • the antennas are preferably separated by about 3/8ths of the resonant wavelength (57mm in the antenna used as an example) of the array and fed with a 45 degree phase difference.
  • the a ⁇ ay of Figure 8A produces the radiation patterns shown in Figure 9A, 9B and 9C.
  • Figure 9A shows the pattern when the elements C and D are fed to produce left-hand circular polarisation with the cross-polar radiation pattern in figure 9B.
  • the metallic load can be of any form to control the input impedance and its bandwidth e.g. a semi-circle coupled with a no ⁇ nal patch load as shown in Figure 8B.
  • one way of obtaining the 45° phase difference is to couple the (upper a ⁇ ay, element-2, phase- 135°) by a transmission line to the (lower a ⁇ ay, element- 1, phase-0°) and for all of the other elements to be connected as shown in Figure 10.
  • the size of the antenna may also be reduced by printing the configuration shown in Figure 2 or 7B on opposing faces of a cuboid of dielectric material. This is shown in Figures 11A, 1 IB and l lC.
  • the antennas shown in figure 11A, 1 IB and 1 IC typically have the same configuration as the antennas in figure 1.
  • feed member 2 and intermediate feed member 8 are of equal size and longer than in figure 1 .
  • the second member 6 in Figure 1 is optional depending on the desired resonant frequency.
  • the dimensions of the antenna are 10 x 10 x 20 mm to produce an antenna having the radiation patterns shown in Figures 12A and 12B at a resonant frequency of l.lGHz.
  • This antenna a ⁇ ay may also be fed by the feed network as shown in Figure 10.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne un élément d'antenne comprenant un ensemble de membres conducteurs oblongs généralement coplanaires couplés en série, l'ensemble comprenant un membre d'alimentation (2, 2') destiné à recevoir une alimentation d'antenne (10), et un premier membre (4, 4') couplé au membre d'alimentation (2, 2'). Le premier membre (4, 4') peut généralement s'étendre perpendiculairement au membre d'alimentation (2, 2') et l'élément peut comprendre, en supplément, un deuxième membre (6, 6') couplé à l'extrémité distale du premier membre, un membre intermédiaire (18) couplé entre les premier et deuxième membres (4', 6') et/ou un troisième membre (20) couplé à l'extrémité distale du deuxième membre (6'). Les deux membres additionnels s'étendent généralement parallèle au membre d'alimentation(2').
PCT/GB2001/001665 2000-04-15 2001-04-12 Antenne WO2001080358A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU93356/01A AU9335601A (en) 2000-04-15 2001-04-12 An antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0009292A GB0009292D0 (en) 2000-04-15 2000-04-15 An Antenna
GB0009292.4 2000-04-15

Publications (1)

Publication Number Publication Date
WO2001080358A1 true WO2001080358A1 (fr) 2001-10-25

Family

ID=9889961

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/001665 WO2001080358A1 (fr) 2000-04-15 2001-04-12 Antenne

Country Status (3)

Country Link
AU (1) AU9335601A (fr)
GB (1) GB0009292D0 (fr)
WO (1) WO2001080358A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005088768A1 (fr) * 2004-03-15 2005-09-22 Elta Systems Ltd. Antenne a gain eleve pour frequences micro-ondes
EP1863125A1 (fr) 2006-05-30 2007-12-05 Fujitsu Limited Antenne dipole croisée et étiquette avec cette antenne
US8228235B2 (en) 2004-03-15 2012-07-24 Elta Systems Ltd. High gain antenna for microwave frequencies
WO2013017846A1 (fr) * 2011-07-29 2013-02-07 Bae Systems Plc Communication radiofréquence
CN103414015A (zh) * 2013-08-08 2013-11-27 清华大学 宽带三维全向平面天线

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2429504A1 (fr) * 1978-06-19 1980-01-18 France Etat Doublet et antenne en plaques a polarisation circulaire
US4672386A (en) * 1984-01-05 1987-06-09 Plessey Overseas Limited Antenna with radial and edge slot radiators fed with stripline

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2429504A1 (fr) * 1978-06-19 1980-01-18 France Etat Doublet et antenne en plaques a polarisation circulaire
US4672386A (en) * 1984-01-05 1987-06-09 Plessey Overseas Limited Antenna with radial and edge slot radiators fed with stripline

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005088768A1 (fr) * 2004-03-15 2005-09-22 Elta Systems Ltd. Antenne a gain eleve pour frequences micro-ondes
US7023386B2 (en) 2004-03-15 2006-04-04 Elta Systems Ltd. High gain antenna for microwave frequencies
US8228235B2 (en) 2004-03-15 2012-07-24 Elta Systems Ltd. High gain antenna for microwave frequencies
EP1863125A1 (fr) 2006-05-30 2007-12-05 Fujitsu Limited Antenne dipole croisée et étiquette avec cette antenne
US7446727B2 (en) 2006-05-30 2008-11-04 Fujitsu Limited Cross dipole antenna and tag using the same
WO2013017846A1 (fr) * 2011-07-29 2013-02-07 Bae Systems Plc Communication radiofréquence
US9203132B2 (en) 2011-07-29 2015-12-01 Bae Systems Plc Transition interface having first and second coupling elements comprised of conductive tracks oriented at different angles with respect to each other
CN103414015A (zh) * 2013-08-08 2013-11-27 清华大学 宽带三维全向平面天线

Also Published As

Publication number Publication date
AU9335601A (en) 2001-10-30
GB0009292D0 (en) 2000-05-31

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