EP2264833B1 - Subreflektor einer Parabolantenne - Google Patents

Subreflektor einer Parabolantenne Download PDF

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Publication number
EP2264833B1
EP2264833B1 EP10164963.0A EP10164963A EP2264833B1 EP 2264833 B1 EP2264833 B1 EP 2264833B1 EP 10164963 A EP10164963 A EP 10164963A EP 2264833 B1 EP2264833 B1 EP 2264833B1
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Prior art keywords
secondary reflector
radius
reflector
external surface
reliefs
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EP10164963.0A
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English (en)
French (fr)
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EP2264833A2 (de
EP2264833A3 (de
Inventor
Denis Tuau
Armel Le Bayon
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Alcatel Lucent SAS
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Alcatel Lucent SAS
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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
    • H01Q19/10—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 using reflecting surfaces
    • H01Q19/18—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 using reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/19—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 using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H01Q19/193—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 using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface with feed supported subreflector

Definitions

  • the present invention relates to parabolic dishes with double reflectors, including radio frequency (RF) antennas used in the field of telecommunications.
  • RF radio frequency
  • parabolic antennas comprise a concave primary reflector of large diameter and a secondary reflector ("sub-reflector" in English) convex of smaller diameter which is placed in the vicinity of the focus, on the same axis of revolution as the primary reflector.
  • These antennas operate indifferently in transmitter mode or in receiver mode, corresponding to two opposite directions of RF wave propagation.
  • the description is given either in transmission mode or in reception mode of the antenna, according to which allows to better illustrate the described phenomena. It should be noted that all the reasonings apply to the antennas as well in reception as in emission.
  • the secondary reflector usually has a dielectric body transparent to RF waves.
  • the outer surface of substantially conical general shape of the secondary reflector faces the primary reflector.
  • the convex inner surface of the secondary reflector is coated with a treatment for reflecting the RF waves towards the primary reflector through the dielectric body. Multiple reflections of RF waves occur between the end of the waveguide and the primary reflector, involving the secondary reflector.
  • annular reliefs on the outer surface of the dielectric body reduces the multiple reflections of RF waves that occur between the waveguide and the primary reflector via the metallized inner surface of the secondary reflector.
  • these reliefs have little effect on two other important characteristics of the double reflector: the antenna gain, expressed in dBi or isotropic decibel, and the spillover losses, expressed in dB.
  • the overflow losses for the transmission mode of an RF antenna correspond to values of the illumination angle (measured with respect to the axis of revolution of the secondary reflector) of the primary reflector by the secondary reflector for which the RF waves from the waveguide are reflected by the secondary reflector in a direction that is outside the perimeter of the primary reflector. These losses lead to pollution of the environment by RF waves. These overflow losses should be limited to levels defined by standards.
  • a conventional solution is to attach to the periphery of the primary reflector a skirt which has the shape of a cylinder, of diameter close to that of the primary reflector and of suitable height, lined internally with a layer absorbing RF radiation.
  • this known solution has the disadvantage today of the cost of the material of the skirt, as well as the cost of assembling this skirt on the reflector.
  • the document US 6724349 proposes to provide the inside of the waveguide transverse sections of different diameter and to provide on the convex surface of the secondary reflector faces perpendicular to its axis.
  • the present invention aims to provide a dual reflector antenna whose losses overflow are significantly reduced.
  • the invention consists in proposing a secondary reflector whose outer surface has a profile according to a particular curve.
  • the secondary reflector is a volume of axial symmetry having an outer surface whose generator is a curve described by the preceding equation.
  • the present invention makes it possible to dispense with the skirt, or at least to reduce the height of the skirt of the primary reflector, which provides a cost and space advantage.
  • the invention can be used in applications such as, for example, the production of terrestrial antennas for receiving a radiofrequency signal emitted by a satellite or the link between two terrestrial antennas, and more generally in any application concerning radiofrequency links.
  • point-to-point in the frequency band from 7 GHz to 40 GHz.
  • the scheme of the figure 1 shows the outer surface 1 of axis of revolution XX 'of a secondary reflector 2 of height L.
  • the reflector 2 has a first end 3 of radius a w allowing its junction with a waveguide 4.
  • the reflector 2 has a second end 5 of radius ⁇ 0 .
  • A is a digital constant influencing the amplitude of the curve. The value of A is different from zero and determined by numerical optimization.
  • the profile of the outer surface 25 meets the equation given above.
  • several reliefs 27 have been formed .
  • the reliefs 27 generally have an annular shape centered on the axis YY 'of the reflector 20.
  • the figure 3 shows in rear perspective the outer surface of the reflector 20 on which appear the reliefs 27 in the form of rings.
  • the first radius w is 0.04 ⁇ and the second radius ⁇ 0 is 2.75 ⁇ for a total height L of the reflector 20 of 2.3 ⁇ , where ⁇ is the working wavelength of the antenna.
  • the figure 4 30 shows the curve of the loss caused by reflections.
  • a reflection loss of less than -24dB is observed on about 18% of the width of the frequency band.
  • a low reflection loss value is therefore observed over a large part of the frequency band.
  • the antenna has a gain of up to 74%.
  • curves 50 and 51 show the radiation pattern of the primary reflector in the horizontal and vertical plane, respectively.
  • Zones 52 correspond to spill over areas corresponding to a reflection angle greater than 100 °. It is observed that in the present case these overflow losses are low, of the order of -12 dB at the edges of the primary reflector.
  • the radiation pattern 60 in the horizontal plane of the antenna is given on the figure 6 .
  • the reference curve 61 represents the standard profile (ETSI) and the zone 62 corresponds to the side lobes.

Landscapes

  • Aerials With Secondary Devices (AREA)

Claims (3)

  1. Sekundärer Reflektor einer Parabolantenne, umfassend:
    - ein erstes Ende (3), eine Verbindungsstelle mit einem ersten Radius aw umfassend, dafür ausgelegt, um an das Ende eines Wellenleiters (4) zu koppeln.
    - ein zweites Ende (5), einen zweiten Radius po umfassend, der größer ist als der erste Radius aw,
    - eine innere, konvexe und reflektierende Oberfläche im Bereich des zweiten Endes (5), eine Rotationsaxe X-X' umfassend,
    - eine externe Oberfläche (1) mit derselben Achse, die beide Enden (3, 5) miteinander verbindet,
    - einen dielektrischen Körper (26), der sich zwischen dem ersten (3) und dem zweiten Ende (5) erstreckt und von der internen sowie der externen Oberfläche (1) begrenzt wird,
    dadurch gekennzeichnet, dass die externe Oberfläche (1) des sekundären Reflektors (2) ein Profil hat, welches durch folgende Gleichung beschrieben wird: ρ z = a ω + ρ 0 − a ω 1 − A z + L L + A sin 2 π z + L 2 L
    Figure imgb0008
     wobei
    A eine nummerische Konstante ungleich null ist,
    aw der erste Radius des ersten Endes (3) des sekundären Reflektors (2) ist,
    po der zweite Radius des zweiten Endes (5) des sekundären Reflektors (2) ist,
    L die Gesamthöhe des sekundären Reflektors (2) ist,
    z die genutzte Höhe des sekundären Reflektors (2) ist, und
    p(z) der Radius eines Abschnitts auf der Höhe z des sekundären Reflektors (2) ist.
    und weiterhin dadurch gekennzeichnet, dass die externe Oberfläche (1) des sekundären Reflektors (2) eine Vielzahl von ringförmigen Furchen (27) rund um den dielektrischen Körper (26) umfasst, wobei die Linie (28), welche die externen Oberflächen der Furche (27) verbindet, und die Linien, welche die Basis der Furchen (27) verbindet, von einer Gleichung beschrieben werden, welche der Gleichung entspricht, welche die externe Oberfläche (1) des sekundären Reflektors (2) beschreibt.
  2. Sekundärer Reflektor nach Anspruch 1, wobei [die externe Oberfläche (25) des sekundären Reflektors (20) weiterhin mindestens eine ringförmige Furche (27) rund um den dielektrischen Körper (26) umfasst], und wobei der erste Radius aw 0,04λ, der zweite Radius pO 2,75λ und die Gesamthöhe L des Reflektors (20) 2,3λ beträgt, wobei λ die Arbeitswellenlänge der Antenne ist.
  3. Parabolantenne, einen primären Reflektor und einen sekundären Reflektor nach einem der vorgenannten Ansprüche umfassend, wobei der sekundäre Reflektor (2) umfasst:
    - ein erstes Ende (3), eine Verbindungsstelle mit einem ersten Radius aw umfassend, dafür ausgelegt, um an das Ende einen Wellenleiter (4) zu koppeln.
    - ein zweites Ende (5), einen zweiten Radius po umfassend, der größer ist als der erste Radius aw,
    - eine innere, konvexe und reflektierende Oberfläche im Bereich des zweiten Endes (5), eine Rotationsaxe X-X' umfassend,
    - eine externe Oberfläche (1) mit derselben Achse, die beiden Enden (3, 5) miteinander verbindend,
    - einen dielektrischen Körper (26), der sich zwischen dem ersten (3) und dem zweiten Ende (5) erstreckt und von der internen sowie der externen Oberfläche (1) begrenzt wird,
    dadurch gekennzeichnet, dass die externe Oberfläche (1) des sekundären Reflektors (2) ein Profil hat, welches durch folgende Gleichung beschrieben wird: ρ z = 1 A + L L + A sin 2 2 L
    Figure imgb0009
     wobei
    A eine nummerische Konstante ungleich null ist,
    aw der erste Radius des ersten Endes (3) des sekundären Reflektors (2) ist,
    pO der zweite Radius des zweiten Endes (5) des sekundären Reflektors (2) ist,
    L die Gesamthöhe des sekundären Reflektors (2) ist,
    z die genutzte Höhe des sekundären Reflektors (2) ist, und
    p(z) der Radius eines Abschnitts auf der Höhe z des sekundären Reflektors (2) ist.
    und weiterhin dadurch gekennzeichnet, dass die externe Oberfläche (1) des sekundären Reflektors (2) eine Vielzahl von ringförmigen Furchen (27) rund um den dielektrischen Körper (26) umfasst, wobei die Linie (28), welche die externen Oberflächen der Furche (27) verbindet, und die Linien, welche die Basis der Furchen (27) verbindet, von einer Gleichung beschrieben werden, welche der Gleichung entspricht, welche die externe Oberfläche (1) des sekundären Reflektors (2) beschreibt.
EP10164963.0A 2009-06-04 2010-06-04 Subreflektor einer Parabolantenne Active EP2264833B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0953693A FR2946465B1 (fr) 2009-06-04 2009-06-04 Reflecteur secondaire d'antenne parabolique

Publications (3)

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EP2264833A2 EP2264833A2 (de) 2010-12-22
EP2264833A3 EP2264833A3 (de) 2011-01-19
EP2264833B1 true EP2264833B1 (de) 2017-04-19

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104319489B (zh) * 2014-11-03 2017-02-22 中国工程物理研究院应用电子学研究所 一种在近场具有扁平带状波束的毫米波天线

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Publication number Priority date Publication date Assignee Title
US6724349B1 (en) * 2002-11-12 2004-04-20 L-3 Communications Corporation Splashplate antenna system with improved waveguide and splashplate (sub-reflector) designs
JP4919423B2 (ja) * 2007-07-06 2012-04-18 日本無線株式会社 アンテナ給電部

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EP2264833A2 (de) 2010-12-22
FR2946465B1 (fr) 2012-02-24
EP2264833A3 (de) 2011-01-19

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