EP1445829A1 - Subreflektor für Cassegrain-Mikrowellenantenne - Google Patents

Subreflektor für Cassegrain-Mikrowellenantenne Download PDF

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Publication number
EP1445829A1
EP1445829A1 EP04290225A EP04290225A EP1445829A1 EP 1445829 A1 EP1445829 A1 EP 1445829A1 EP 04290225 A EP04290225 A EP 04290225A EP 04290225 A EP04290225 A EP 04290225A EP 1445829 A1 EP1445829 A1 EP 1445829A1
Authority
EP
European Patent Office
Prior art keywords
reflector
ring
antenna
radiation
diameter
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.)
Granted
Application number
EP04290225A
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English (en)
French (fr)
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EP1445829B1 (de
Inventor
Armel Le Bayon
Michael Greiff
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
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Alcatel CIT SA
Alcatel SA
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Publication of EP1445829A1 publication Critical patent/EP1445829A1/de
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Publication of EP1445829B1 publication Critical patent/EP1445829B1/de
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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
    • 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

Definitions

  • the present invention relates to reflectors which are used in antennas Cassegrain type microwave. These antennas have first used in radars and are now widely used in communication systems by satellite, especially in stations individual terrestrial.
  • microwave antennas of the type Cassegrain in which a microwave source placed in the axis of a main parabolic reflector illuminates a secondary reflector located substantially at the focus of this main reflector.
  • the wave microwave comes to reflect on this reflector secondary to then illuminate the main reflector which allows to obtain a radiation diagram having the shaped like a narrow beam. The operation is good heard reverse in reception.
  • a "source" known microwave of such an antenna includes a circular waveguide 101 through which the wave arrives microwave.
  • a hollow dielectric cone 102 is attached on one side to this guide and supports on the other side a secondary reflector 103.
  • the relatively complex of the surface of this reflector corresponds to the state of the art known to limit disadvantages mentioned above, in particular the overflow radiation.
  • the invention proposes a secondary reflector for microwave antenna type Cassegrain with a basic secondary reflector, which includes a first circular "ring" having the shape of a cylinder of conductive material, diameter equal to the outer diameter of the base reflector, fixed by one of its ends at the outer edge of this base reflector to project from the side of the reflective surface of the reflector and having a height H to reduce the "overflow radiation" of the secondary reflector.
  • the invention is characterized in that the reflector further includes a second "ring" having the shape of a circular crown of conductive material, inner diameter equal to the diameter of the first ring, attached to the free end of this first ring and having a width h to increase the decrease in said overflow radiation.
  • the values of parameters H and h are of the order of a quarter of the length medium wave for which the antenna is dimensioned.
  • the first and the second rings are made in the form of a ring single solid with height H 'and thickness h ', and the reflector comprises a material cone solid dielectric which connects the waveguide intended for feed the antenna to the base reflector to allow to decrease the values of the parameters H 'and h' by relation to the values of parameters H and h.
  • the free end of the single solid ring is machined so that present a recess which reduces its thickness on its outer circumference to increase the decrease of said overflow radiation.
  • the microwave source according to a first mode of realization of the invention shown in section on the Figures 2 and 3, includes the same elements 101 to 103 as the source according to known art represented in FIG. 1.
  • the invention proposes adding to the reflector basic secondary 103 a first circular "ring" 104 which has the shape of a cylinder of height H and of diameter equal to the outside diameter of the reflector 103.
  • This ring is made of conductive material, preferably a metal which can be identical to that forming the secondary reflector 103. It is fixed by one of its ends at the outer edge of this reflector, so that it projects from the side of the reflective surface of the reflector, in the direction of the waveguide 101.
  • the effect of this ring is basically to mask the radiation of overflow to redirect it to the useful surface of the main reflector. This gives an increase antenna performance which allows for efficiency identical, to substantially decrease the diameter of the secondary reflector, and therefore the diameter of the reflector main.
  • An improved variant of the invention proposes add a second ring 105 which has the shape a circular crown, also made of material conductor, of width h and internal diameter equal to diameter of the first ring. This crown is fixed to the free end of the first ring.
  • Edge 105 is used when the effect of edge 104 is not enough. Indeed, if we seek to increase the size of the edge 104 too much (i.e. greater than a quarter of the wavelength) to improve a certain part of the diagram we risk deteriorating another region of the radiation pattern. Edge 105 improves diagrams without having this drawback.
  • the dimensions H and h are of the order of a quarter of the average wavelength for which the antenna is sized. Given the very variable forms, known in the art, according to which the secondary reflector 103, the exact dimensions of these parameters will be determined by those skilled in the art to using a few simple tests starting from this approximate dimension of a quarter of the wavelength. Given the simple geometric shapes used by the invention (cylinder and circular crown) these tests will require no special effort.
  • the cone 402 which supports the secondary reflector 103 is made of a material full dielectric which has the effect of reducing the wavelength inside this cone.
  • the tip of the cone gets inside the circular waveguide 401, for purely reasons mechanical.
  • the invention proposes to carry out the cylinder / crown assembly of the first mode of production in the form of a single solid ring 404 having a height H 'and a thickness h'.
  • the free end of this ring, the one facing the main reflector is machined so as to have a recess 405 which reduces the thickness of the ring around its circumference exterior.
  • FIG. 5 the diagrams of radiation 501 from a known antenna, and 502 from a antenna according to the invention.
  • the diagram of the antenna according to the invention is clearly improved, especially in the region corresponding to incidences above 30 °.
  • the invention allows, by reducing the dimensions of the main reflector, to reduce the impact visual of such antennas, which allows them to be integrated more easily in the landscape.

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  • Aerials With Secondary Devices (AREA)
  • Waveguide Aerials (AREA)
EP04290225A 2003-02-04 2004-01-28 Subreflektor für Cassegrain-Mikrowellenantenne Expired - Lifetime EP1445829B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0301236 2003-02-04
FR0301236A FR2850796A1 (fr) 2003-02-04 2003-02-04 Reflecteur secondaire pour antenne hyperfrequence de type cassegrain

Publications (2)

Publication Number Publication Date
EP1445829A1 true EP1445829A1 (de) 2004-08-11
EP1445829B1 EP1445829B1 (de) 2006-06-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04290225A Expired - Lifetime EP1445829B1 (de) 2003-02-04 2004-01-28 Subreflektor für Cassegrain-Mikrowellenantenne

Country Status (6)

Country Link
US (1) US6809695B2 (de)
EP (1) EP1445829B1 (de)
CN (1) CN1525599B (de)
AT (1) ATE332020T1 (de)
DE (1) DE602004001353T2 (de)
FR (1) FR2850796A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102013576A (zh) * 2010-09-20 2011-04-13 西安电子科技大学 修正型卡塞格伦式天线的副面调整方法

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EP2148389A1 (de) * 2008-07-25 2010-01-27 Astrium Limited Gerät für ein Antennensystem
EP2882038B1 (de) 2012-07-31 2019-10-16 Kuang-Chi Innovative Technology Ltd. Cassegrain-metamaterial-antenne
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ATE332020T1 (de) 2006-07-15
US20040150576A1 (en) 2004-08-05
US6809695B2 (en) 2004-10-26
DE602004001353T2 (de) 2007-06-14
DE602004001353D1 (de) 2006-08-10
CN1525599A (zh) 2004-09-01
CN1525599B (zh) 2010-12-15
FR2850796A1 (fr) 2004-08-06
EP1445829B1 (de) 2006-06-28

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