EP2264833A2 - Subreflektor einer Parabolantenne - Google Patents
Subreflektor einer Parabolantenne Download PDFInfo
- Publication number
- EP2264833A2 EP2264833A2 EP10164963A EP10164963A EP2264833A2 EP 2264833 A2 EP2264833 A2 EP 2264833A2 EP 10164963 A EP10164963 A EP 10164963A EP 10164963 A EP10164963 A EP 10164963A EP 2264833 A2 EP2264833 A2 EP 2264833A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- secondary reflector
- radius
- reflector
- height
- dielectric body
- 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
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Classifications
-
- 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) cibvexe 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 RF waves from the waveguide are reflected by the secondary reflector in a direction which is outside the perimeter of the primary reflector. These losses lead to pollution of the environment by RF waves. These overflow losses must be imitated to levels defined by standards.
- a usual 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, coated 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 present invention aims to provide a dual reflector antenna whose losses overflow are significantly reduced.
- A is a numerical constant other than zero (A ⁇ 0)
- w is the first radius of the first end of the secondary reflector
- ⁇ 0 is the second radius of the second end of the secondary reflector
- L is the total height of the secondary reflector
- z is the considered height of the secondary reflector
- ⁇ (z) is the radius of a section placed at the height z of the secondary reflector.
- 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 outer surface of the secondary reflector further comprises at least one ring-shaped relief surrounding the dielectric body.
- ⁇ z at ⁇ + ⁇ 0 - at ⁇ 1 - AT ⁇ z + The The + AT ⁇ sin 2 ⁇ ⁇ ⁇ z + The 2 ⁇
- the line connecting the bases of the reliefs is described by an equation also of the same shape as that describing the outer surface of the reflector.
- A is a numerical constant other than zero (A ⁇ 0)
- w is the first radius of the first end of the secondary reflector
- ⁇ o is the second radius of the second end of the secondary reflector
- 0L is the total height of the secondary reflector
- z is the considered height of the secondary reflector
- ⁇ (z) is the radius of a section placed at the height z of the secondary reflector.
- 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 making it possible to receive a radiofrequency signal emitted by a satellite or the link between two terrestrial antennas, and more generally in any application relating to radiofrequency links.
- 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 .
- ⁇ z at ⁇ + ⁇ 0 - at ⁇ 1 - AT ⁇ z + The The + AT ⁇ sin 2 ⁇ ⁇ ⁇ z + The 2 ⁇
- 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.
- 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 concerned over about 18% of the width of the frequency band.
- a low value of reflection loss 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.
- the zones 52 correspond to the zones of overflow ("spill) over" corresponding to a reflection angle greater than 100 °. It can be observed that in the present case these overflow losses are small, of the order of - 12dB 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)
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)
Publication Number | Publication Date |
---|---|
EP2264833A2 true EP2264833A2 (de) | 2010-12-22 |
EP2264833A3 EP2264833A3 (de) | 2011-01-19 |
EP2264833B1 EP2264833B1 (de) | 2017-04-19 |
Family
ID=41320050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10164963.0A Active EP2264833B1 (de) | 2009-06-04 | 2010-06-04 | Subreflektor einer Parabolantenne |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2264833B1 (de) |
FR (1) | FR2946465B1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104319489A (zh) * | 2014-11-03 | 2015-01-28 | 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 |
Citations (2)
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 |
JP2009017346A (ja) * | 2007-07-06 | 2009-01-22 | Japan Radio Co Ltd | アンテナ給電部 |
-
2009
- 2009-06-04 FR FR0953693A patent/FR2946465B1/fr not_active Expired - Fee Related
-
2010
- 2010-06-04 EP EP10164963.0A patent/EP2264833B1/de active Active
Patent Citations (2)
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 |
JP2009017346A (ja) * | 2007-07-06 | 2009-01-22 | Japan Radio Co Ltd | アンテナ給電部 |
Non-Patent Citations (1)
Title |
---|
MALIK D P S ET AL: "Splash Plate Feed Design", EUROPEAN MICROWAVE CONFERENCE, 1975. 5TH, IEEE, PISCATAWAY, NJ, USA, 1 octobre 1975 (1975-10-01), pages 41-45, XP031060185, * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104319489A (zh) * | 2014-11-03 | 2015-01-28 | 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 |
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 |
Also Published As
Publication number | Publication date |
---|---|
EP2264833B1 (de) | 2017-04-19 |
FR2946465B1 (fr) | 2012-02-24 |
FR2946465A1 (fr) | 2010-12-10 |
EP2264833A3 (de) | 2011-01-19 |
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