EP2466688A1 - Parabolreflektorantenne - Google Patents

Parabolreflektorantenne Download PDF

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Publication number
EP2466688A1
EP2466688A1 EP11193349A EP11193349A EP2466688A1 EP 2466688 A1 EP2466688 A1 EP 2466688A1 EP 11193349 A EP11193349 A EP 11193349A EP 11193349 A EP11193349 A EP 11193349A EP 2466688 A1 EP2466688 A1 EP 2466688A1
Authority
EP
European Patent Office
Prior art keywords
screen
parabolic reflector
antenna
edge
antenna according
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Withdrawn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
EP11193349A
Other languages
English (en)
French (fr)
Inventor
Armel Le Bayon
Denis Tuau
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.)
Alcatel Lucent SAS
Original Assignee
Alcatel Lucent SAS
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 Alcatel Lucent SAS filed Critical Alcatel Lucent SAS
Publication of EP2466688A1 publication Critical patent/EP2466688A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • H01Q19/026—Means for reducing undesirable effects for reducing the primary feed spill-over
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • H01Q19/022—Means for reducing undesirable effects for reducing the edge scattering of reflectors

Definitions

  • This invention pertains to a telecommunication antenna used in particular for mobile communication networks. These directional sectoral or parabolic reflector antennae operate equally well in transmitter mode or in receiver mode, corresponding to two opposite directions of RF wave propagation. It should be noted that all of the arguments that follow apply just as well to both receiving antennae and transmitting antennae.
  • the invention particularly pertains to a parabolic microwave reflector antenna. The invention applies both to double reflector antennae as well as to single reflector antennae.
  • a conventional, continuous-aperture antenna consists of one concave reflector, with for example the shape of a paraboloid of revolution around the antenna's axis of symmetry, and a feed mechanism located along the antenna's axis of symmetry that transmits the electromagnetic waves emitted or received by the antenna.
  • the end of the radio frequency waveguide is located at the reflector's focal point. The distance between the reflector and the end of the waveguide should be sufficiently extensive to permit the lighting up of the entire surface of the reflector.
  • the F/D ratio is in the region of 0.36.
  • F is the focal length of the reflector (distance between the vertex of the reflector and its focal point) and D is the diameter of the reflector.
  • D is the diameter of the reflector.
  • this known solution exhibits the drawback of the cost of the absorbent material for the shroud, the cost of the radome, and the cost of the assembly of this shroud on the primary reflector, especially for antennae of significant diameter. Additionally, this solution is only conceivable in cases where the reflector and its absorbing shroud are protected from the environment by a radome. In fact, the absorbent material offers weak resistance under difficult climate conditions. A simple metal shroud cannot withstand wind and allows the reflection of multiple waves because of the absence of absorbent material.
  • sectoral antennae may be equipped with an absorbing shroud, attached to the reflector and surrounding the aligned radiating components, which also exhibits the drawbacks mentioned above.
  • the aim of this invention is to propose a parabolic microwave reflector antenna at a moderate price without degraded electrical performance.
  • Another aim of the invention is to propose a parabolic reflector antenna with an improved front-to-back ratio.
  • Another aim of the invention is to propose a parabolic reflector antenna for which the losses by spillover are reduced while requiring an absorbing shroud of lower height.
  • Another aim of the invention is to propose a parabolic reflector antenna in which the diffraction of the waves appearing on the outside edge of the antenna reflector is significantly reduced.
  • the purpose of this invention is an antenna with at least one parabolic reflector having an edge and at least one screen, whose width is less than half of the length of the edge, attached to the edge of the parabolic reflector.
  • the screen is attached to the inside of the perimeter of the parabolic reflector and is formed of at least two flat sections linked together, two contiguous sections forming a concave angle ⁇ .
  • the concave angle ⁇ should be between 90 and 150 degrees, and also this concave angle ⁇ should be preferably in the region of 120 degrees.
  • the screen corresponds to the curve of the circular edge of the parabolic reflector.
  • the screen is straight and coincides with a cord on the circular edge of the parabolic reflector.
  • the screen is straight and coincides with the straight edge of the parabolic reflector.
  • the antenna consists of at least two screens attached to the edge of the parabolic reflector in diametrically opposite positions.
  • the width of the screen is of an order of magnitude of one quarter of the diameter of the parabolic reflector.
  • the sections forming the screen have a polygonal shape, selected for example from among a quadrilateral, a triangle, and a hexagon.
  • the screen has a conducting surface.
  • the screen can be made out of metal or covered with metal.
  • a screen attached to part of the edge of the parabolic reflector helps improve radiation performance.
  • the shape of this screen is defined so as to avoid wave reflections in the primary beam of the radiation pattern of the antenna. With this configuration, the antenna can achieve high radio performance at a moderate cost.
  • the advantage of this invention is that it makes it possible to use a screen area that is less than that of the shroud of the prior art attached to the entire edge of the parabolic reflector, which brings an appreciable advantage in cost and in bulk.
  • the invention can be used in applications such as, for example, the realization of terrestrial antennae allowing the reception of a radiofrequency signal emitted by a satellite or the link between two terrestrial antennae, and in a more general manner in any application relating to point-to-point radiofrequency links in the frequency band of 7 GHz to 40 GHz.
  • FIG 1 illustrates an embodiment of an antenna 1 that is a parabolic reflector telecommunication antenna 2.
  • the parabolic reflector 2 is concave, and its concave surface has a circular edge 3.
  • a waveguide 4 is placed at the centre of the concave surface of the parabolic reflector 2, and emits radiation 5 toward the internal surface of the parabolic reflector 2, a part of which 6 is reflected by a screen 7 placed on the circular edge 3 on the inside of the perimeter of the parabolic reflector 2 and which corresponds to the curve of the circular edge of the parabolic reflector 2.
  • the parabolic reflector 2 consists of two screens 7 attached symmetrically, in diametrically opposite positions, and attached to the inside of the circular edge of the parabolic reflector 2 as shown in the top view in figure 2 .
  • the width 8 of the screen 7 is of an order of magnitude of one quarter of the diameter D of the parabolic reflector 2.
  • FIG. 3 diagrammatically illustrates a detailed top view of an embodiment of a screen 7.
  • a screen 7 is a conducting part that helps prevent radiation reflected in the direction of the main radiation beam in the horizontal plane.
  • the screen 7 is made for example of a pleated metal sheet attached to the inside of the edge of the parabolic reflector.
  • the screen 7 is composed of many contiguous flat rectangular sections 30 linked together to form a non-zero angle, like a protective screen.
  • the sections may have any polygonal shape, such as a hexagon, a triangle or a quadrilateral such as a parallelogram, a square, a rectangle, a rhomboid, a trapezoid, etc.
  • the screen sections 30 Seen from the waveguide 4 placed at the centre of the parabolic reflector 2, the screen sections 30 each form a concave angle ⁇ of between 90° and 150°, and preferably in the region of 120°.
  • the antenna 1 in figures 1 and 2 consists of fifteen sections 30. This disposition allows the screen to reflect all undesirable radiation 32 in a single direction away from the main beam, thus avoiding multiple reflections.
  • the frequency domain is between 25 GHz and 7 GHz, and the dimensions (height, width 31 ) of the screen sections 30 are large considering the wavelength.
  • Figure 4 illustrates the radiation pattern in the horizontal plane of an antenna of the prior art without an absorbing shroud
  • figure 5 illustrates the radiation pattern in the horizontal plane of the antenna in figure 1 .
  • a comparison of these two figures shows that the presence of screens on the circular edge of the parabolic reflector considerably reduces the peaks in the radiation pattern at the +90° and -90° angles. Additionally, the screen helps vertically reorient the electromagnetic field toward an area located above or below the horizontal radiation plane, so as to avoid any disturbance of the radiation pattern in the horizontal plane.
  • the antenna of the prior art gives a radiation pattern with mediocre performance because of a high level of losses by spillover 40, 41 near the edge of the parabolic reflector. On the other hand, for an antenna 1 equipped with screens 7, the losses by spillover 50, 51 are greatly reduced.
  • FIG. 6 illustrates an embodiment of an antenna 60 equipped with two screens 61 attached to the edge 62 of a parabolic reflector 63 in diametrically opposite positions.
  • Each screen 61 corresponds to the curve of the circular edge of the parabolic reflector and is made up of a single section 64, for example composed of a flat rectangular metal sheet.
  • FIG. 7 illustrates another embodiment of an antenna 70 consisting of a parabolic reflector 71.
  • Two straight screens 72 are attached so as to coincide with a cord on the circular edge 73 of the parabolic reflector 71.
  • Each screen 72 is made up of many contiguous flat sections that are linked together to form a non-zero angle. This embodiment has the advantage of a smaller footprint for the antenna 70.
  • the screen is straight, of a similar shape to the one in figure 7 , and coincides with the straight edge of the parabolic reflector.
  • the parabolic reflector has an edge that adopts the shape of a square with rounded corners or a rectangle whose ends are half-circles.
  • the present invention is not limited to the described embodiments, but rather is subject to many variants accessible to the person skilled in the art without departing from the spirit of the invention.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)
EP11193349A 2010-12-14 2011-12-13 Parabolreflektorantenne Withdrawn EP2466688A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1060450A FR2968848A1 (fr) 2010-12-14 2010-12-14 Antenne a reflecteur parabolique

Publications (1)

Publication Number Publication Date
EP2466688A1 true EP2466688A1 (de) 2012-06-20

Family

ID=44236714

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11193349A Withdrawn EP2466688A1 (de) 2010-12-14 2011-12-13 Parabolreflektorantenne

Country Status (2)

Country Link
EP (1) EP2466688A1 (de)
FR (1) FR2968848A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160087345A1 (en) * 2013-05-15 2016-03-24 Alcatel Lucent Radome for an antenna with a concave-reflector
WO2022099143A1 (en) * 2020-11-09 2022-05-12 Hughes Network Systems, Llc Reducing reflector antenna spillover lobes and back lobes in satellite communication systems

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2030145A1 (de) * 1970-06-18 1971-12-23 Siemens Ag Richtantenne fur sehr kurze elektromagne tische Wellen
JPS56146305A (en) * 1980-04-15 1981-11-13 Nippon Telegr & Teleph Corp <Ntt> Electric wave masking substance
GB2081023A (en) * 1980-06-03 1982-02-10 Mitsubishi Electric Corp Reflector antenna
EP0192048A1 (de) * 1985-01-21 1986-08-27 Siemens Aktiengesellschaft Reflektorantenne mit Stützen im Strahlengang
JPH09312518A (ja) * 1996-05-21 1997-12-02 Mitsubishi Electric Corp 複反射鏡アンテナ装置
WO1998006147A1 (en) * 1996-08-08 1998-02-12 Endgate Corporation A corrugated subreflector

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2806495C2 (de) * 1978-02-16 1980-04-03 Standard Elektrik Lorenz Ag, 7000 Stuttgart Zweireflektorantenne
DE2920412C2 (de) * 1979-05-19 1985-05-02 ANT Nachrichtentechnik GmbH, 7150 Backnang Parabolspiegelantenne mit Seitenblenden

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2030145A1 (de) * 1970-06-18 1971-12-23 Siemens Ag Richtantenne fur sehr kurze elektromagne tische Wellen
JPS56146305A (en) * 1980-04-15 1981-11-13 Nippon Telegr & Teleph Corp <Ntt> Electric wave masking substance
GB2081023A (en) * 1980-06-03 1982-02-10 Mitsubishi Electric Corp Reflector antenna
EP0192048A1 (de) * 1985-01-21 1986-08-27 Siemens Aktiengesellschaft Reflektorantenne mit Stützen im Strahlengang
JPH09312518A (ja) * 1996-05-21 1997-12-02 Mitsubishi Electric Corp 複反射鏡アンテナ装置
WO1998006147A1 (en) * 1996-08-08 1998-02-12 Endgate Corporation A corrugated subreflector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160087345A1 (en) * 2013-05-15 2016-03-24 Alcatel Lucent Radome for an antenna with a concave-reflector
US10224640B2 (en) * 2013-05-15 2019-03-05 Nokia Shanghai Bell Co., Ltd. Radome for an antenna with a concave-reflector
WO2022099143A1 (en) * 2020-11-09 2022-05-12 Hughes Network Systems, Llc Reducing reflector antenna spillover lobes and back lobes in satellite communication systems
US20220149536A1 (en) * 2020-11-09 2022-05-12 Hughes Network Systems, Llc Reducing reflector antenna spillover lobes and back lobes in satellite communication systems

Also Published As

Publication number Publication date
FR2968848A1 (fr) 2012-06-15

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