EP2416449A1 - Parabolantenne - Google Patents

Parabolantenne Download PDF

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Publication number
EP2416449A1
EP2416449A1 EP11176114A EP11176114A EP2416449A1 EP 2416449 A1 EP2416449 A1 EP 2416449A1 EP 11176114 A EP11176114 A EP 11176114A EP 11176114 A EP11176114 A EP 11176114A EP 2416449 A1 EP2416449 A1 EP 2416449A1
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EP
European Patent Office
Prior art keywords
antenna
reflector
groove
antenna according
traps
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Withdrawn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
EP11176114A
Other languages
English (en)
French (fr)
Inventor
Armel Le Bayon
Denis Tuau
Jean-Christophe Louvigne
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 EP2416449A1 publication Critical patent/EP2416449A1/de
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • H01Q19/12—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 wherein the surfaces are concave
    • H01Q19/13—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 wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination

Definitions

  • the present invention relates to a parabolic reflector telecommunication antenna, used in particular for mobile communication networks. These antennas operate indifferently in transmitter mode or in receiver mode, corresponding to two opposite directions of RF wave propagation. It should be noted that all the reasonings apply to the antennas as well in reception as in emission.
  • the invention relates to a microwave antenna with a parabolic reflector. The invention applies both to dual reflector antennas and antennas having only one reflector.
  • a conventional radiating aperture antenna comprises a reflector having a concavity, for example having the form of a paraboloid of revolution about the axis of symmetry of the antenna, and a feeding device located along the axis of the antenna. symmetry of the antenna transmitting the electromagnetic waves emitted or received by the antenna.
  • the end of the radiofrequency waveguide is at the focus of the reflector.
  • the waveguide is inserted into an orifice on the axis of the reflector, and its end is bent 180 ° to face the reflector.
  • the maximum half-angle of radiation at the folded end of the waveguide to illuminate the reflector is small, of the order of 70 °.
  • the distance between the reflector and the end of the waveguide must therefore be large enough to illuminate the entire surface of the reflector.
  • the value of the diameter D is determined by the central working frequency of the antenna.
  • the F / D ratio is of the order of 0.36.
  • F is the focal length of the reflector (distance between the top of the reflector and its focus)
  • D is the diameter of the reflector.
  • a parabolic antenna with a low F / D value of less than or equal to 0.25, for example around 0.17 (“deep dish” in English), has a more absorbent skirt. short than the shallow reflector antenna. Nevertheless, the field on the edge of the antenna is higher in the case of a deep dish antenna. Due to the very short height of the skirt, the field level on the edge of the antenna is close to the field level at the end of the parabolic reflector (about 2 dB at 3 dB gap). In the case of a shallow reflector antenna, the difference is higher and about 10 dB. Distribution currents may appear on the edge of the antenna and disturb the forward / backward ratio of the radiation pattern by the appearance of wave diffraction on the peripheral edge of the antenna. The values of the radiation pattern exceed the maximum values allowed by the ETSI class 3 mask.
  • the object of the present invention is to propose a parabolic reflector microwave antenna in which the diffraction of the waves appearing on the outer peripheral edge of the antenna has been substantially reduced.
  • the invention also aims to provide a parabolic reflector antenna whose front / rear ratio is improved.
  • the invention also aims to provide a parabolic reflector antenna requiring a skirt of lesser height.
  • the object of the present invention is an antenna comprising a parabolic reflector, provided with a skirt, cooperating with a means for emitting incident radiation in the direction of the reflector.
  • the antenna comprises means for reducing the distribution current appearing on the edge of the antenna, these means being composed of traps having the shape of at least one groove, the side walls of which are arranged perpendicularly to the frontal or lateral external surface. the peripheral edge of the antenna.
  • the traps are even in number and arranged symmetrically.
  • the angle formed by the sector of a trap is preferably of the order of 60 °. More preferably each trap has a shape adapted to the rounding of the peripheral edge of the antenna.
  • each trap has the shape of at least one conductive surface groove.
  • the groove is formed of a material which may be a metal or a metallized plastic.
  • the groove has dimensions of the order of a fraction of the wavelength of the incident radiation.
  • the groove has a depth of the same order of magnitude as its width, and more preferably the width and depth are equal.
  • the groove may have a section selected from a flat-bottom U-shaped section, a U-shaped section with a rounded bottom, and a V-shaped section. Its side walls may be straight or inclined.
  • the present invention reduces the height of the skirt attached to the parabolic reflector, which provides a cost advantage and significant size.
  • 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 figure 1 is a diagram showing a reflector 1 , having the shape of a parabola arc, disposed facing a waveguide 2 which emits incident radiation 3 towards the reflector 1 .
  • Most of the incident radiation 3 is reflected on the reflector 1 and forms the radiation emitted 4 by the antenna. However, part of the incident radiation 3 is returned in a divergent direction, and causes overflow losses 5 .
  • another part of the incident radiation 3 reaches the edges of the reflector 1, where a diffraction 6 occurs, which increases the field at the rear of the parabolic reflector 1 and contributes to deteriorating the forward / backward ratio.
  • An antenna shown in section on the figure 2 , usually comprises a parabolic reflector 1 provided with a skirt 7, forming a cylindrical wall, internally lined with an absorbent material 8 and closed by a radome 9 .
  • the incident radiation 3 coming from the waveguide 2 is reflected by the reflector 1 in the form of a radiation emitted 4 .
  • the radiation 10 which projects beyond the reflector 1 is absorbed by the absorbent material 8 of the skirt 7 .
  • the characteristic of the radiation pattern of a circular horn waveguide antenna is determined by the mode of transmission of the horn waveguide, which is generally the dominant mode or mode TE 11 . Since the dominant mode TE 11 is asymmetric around the central axis of the horn, the horn antenna radiation pattern is disadvantageously asymmetrical around the central axis. When using a horn-shaped waveguide with a parabolic reflector, the asymmetric radiation characteristic leads to a reduction of the antenna radiation efficiency and a deterioration of the cross-polarization waves.
  • the antenna 30 comprises a reflector 31 surmounted by a skirt 32 closed by a radome 33 plane.
  • the diameter D of the reflector 31 of the antenna 30 is of the order of 2 ft (0.6096 m), and the operating frequency range is between 7 GHz and 14 GHz.
  • One way to reduce the diffraction of the waves appearing on the outer peripheral edge of the antenna is to suppress the current, in particular using quarter-wave traps. These traps have the shape of grooves with dimensions close to a quarter of the wavelength considered.
  • the outer surface of the skirt 32 carries, in lateral position, wave traps 34 with a conductive surface, which may be metallic or made of metallized plastic. As shown on the figure 5 these traps 34 are in the form of grooves whose depth P and the spacing E of the walls of the groove depend on the wavelength ⁇ , the incident RF signal 10 emitted by the waveguide 35 . Preferably, the dimensions E and P of the traps 34 are of the order of ⁇ / 5 at 8 GHz, ie here 8 mm. In this case the traps 34 are in the form of two contiguous parallel grooves with vertical sidewalls arranged perpendicular to the lateral external surface of the skirt 32 . For low frequency operation; it is preferable to use at least two traps 34 .
  • the traps are placed in symmetrical position: they are therefore in even numbers. These traps 34 can be placed on only part of the peripheral rim of the antenna, for example diametrically opposed as shown in FIG. figure 3 , or on the entire circumference of the antenna. When the traps do not cover the entire circumference of the antenna, the angle ⁇ formed by the sector of a trap is of the order of 60 °. For example, for an antenna having a diameter of about 65 cm, this represents a length of about 35 cm for each trap.
  • the shape of the trap must therefore adapt to the roundness of the peripheral edge of the antenna as shown in FIG. figure 3 .
  • the purpose of the traps 34 is to reduce or even eliminate the distribution current 36 on the edge of the antenna 30 in order to reduce the diffraction.
  • the principle of their operation is based on the fact that they produce a phase shift of a part of the wave which is then placed in phase opposition with the main wave and is canceled out.
  • the antenna 40 comprises a reflector 41 surmounted by a skirt 42 closed by a radome 43 .
  • the inner surface of the skirt 42 is coated with an absorbent material 44 .
  • the outer surface of the skirt 42 carries, in the frontal position, wave traps 45 .
  • the traps 45 are in the form of a single groove with vertical lateral walls arranged perpendicularly to the front external surface of the skirt 42 .
  • the angle ⁇ formed by the sector of a trap is of the order of 60 °, when the traps do not cover the entire circumference of the antenna. For example, for an antenna having a diameter of about 65 cm, this represents a length of about 35 cm for each trap.
  • the shape of the trap adopts the rounding of the edge of the antenna.
  • the traps 45 can be fixed on the edge forming the circumference of the radome 43 .
  • traps can be placed both in lateral position and in frontal position on the antenna. The number of traps is not limited.
  • the section of the groove may have a varied shape, for example a U-shaped section with a flat bottom as shown in the drawings.
  • Figures 4 to 6 a U-shaped section with a rounded bottom 50 as on the figure 7a or a V-shaped section 51 like on the figure 7b .
  • the side walls flanking the groove can be straight as shown on the Figures 4 to 6 , or inclined 52 as on the Figure 7c .
  • the side lobes 61 exceeds the ETSI standard.
  • the side lobes 62 of an antenna provided with traps according to one embodiment of the invention are very clearly reduced. This shows that the traps are an effective means of reducing the diffraction of the waves appearing on the outer peripheral edge of an antenna.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)
EP11176114A 2010-08-02 2011-08-01 Parabolantenne Withdrawn EP2416449A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1056366A FR2963487B1 (fr) 2010-08-02 2010-08-02 Antenne a reflecteur parabolique

Publications (1)

Publication Number Publication Date
EP2416449A1 true EP2416449A1 (de) 2012-02-08

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EP11176114A Withdrawn EP2416449A1 (de) 2010-08-02 2011-08-01 Parabolantenne

Country Status (2)

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EP (1) EP2416449A1 (de)
FR (1) FR2963487B1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016061021A1 (en) 2014-10-14 2016-04-21 Ubiquiti Networks, Inc. Signal isolation shrouds and reflectors for antenna
US10069580B2 (en) 2014-06-30 2018-09-04 Ubiquiti Networks, Inc. Wireless radio device alignment tools and methods
US10136233B2 (en) 2015-09-11 2018-11-20 Ubiquiti Networks, Inc. Compact public address access point apparatuses
US10205471B2 (en) 2013-10-11 2019-02-12 Ubiquiti Networks, Inc. Wireless radio system optimization by persistent spectrum analysis
US10312598B2 (en) 2013-02-04 2019-06-04 Ubiquiti Networks, Inc. Radio system for long-range high-speed wireless communication
US10566676B2 (en) 2014-04-01 2020-02-18 Ubiquiti Inc. Compact radio frequency antenna apparatuses
US10756422B2 (en) 2009-06-04 2020-08-25 Ubiquiti Inc. Antenna isolation shrouds and reflectors
SE1930225A1 (en) * 2019-06-26 2020-12-27 Leax Arkivator Telecom Ab AN ANTENNA WITH REDUCED BACK-LOBE RADIATION
US11909087B2 (en) 2013-02-04 2024-02-20 Ubiquiti Inc. Coaxial RF dual-polarized waveguide filter and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101545672B1 (ko) * 2013-07-22 2015-08-19 콤스코프 테크놀로지스, 엘엘씨 실드를 구비한 저측대파 반사경 안테나

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5495157A (en) * 1978-01-13 1979-07-27 Mitsubishi Electric Corp Antenna unit
JPS5495158A (en) * 1978-01-13 1979-07-27 Mitsubishi Electric Corp Antenna unit
JPS5637703A (en) * 1979-09-04 1981-04-11 Nippon Telegr & Teleph Corp <Ntt> Reflector antenna
JPS56146305A (en) * 1980-04-15 1981-11-13 Nippon Telegr & Teleph Corp <Ntt> Electric wave masking substance
JPS60157304A (ja) * 1984-01-27 1985-08-17 Mitsubishi Electric Corp 複反射鏡アンテナ
EP1128468A2 (de) * 2000-02-25 2001-08-29 Andrew AG Mikrowellen-Reflektorantennen
US20050190116A1 (en) * 2004-02-27 2005-09-01 Andrew Corporation Reflector antenna radome with backlobe suppressor ring and method of manufacturing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5495157A (en) * 1978-01-13 1979-07-27 Mitsubishi Electric Corp Antenna unit
JPS5495158A (en) * 1978-01-13 1979-07-27 Mitsubishi Electric Corp Antenna unit
JPS5637703A (en) * 1979-09-04 1981-04-11 Nippon Telegr & Teleph Corp <Ntt> Reflector antenna
JPS56146305A (en) * 1980-04-15 1981-11-13 Nippon Telegr & Teleph Corp <Ntt> Electric wave masking substance
JPS60157304A (ja) * 1984-01-27 1985-08-17 Mitsubishi Electric Corp 複反射鏡アンテナ
EP1128468A2 (de) * 2000-02-25 2001-08-29 Andrew AG Mikrowellen-Reflektorantennen
US20050190116A1 (en) * 2004-02-27 2005-09-01 Andrew Corporation Reflector antenna radome with backlobe suppressor ring and method of manufacturing

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10756422B2 (en) 2009-06-04 2020-08-25 Ubiquiti Inc. Antenna isolation shrouds and reflectors
US10312598B2 (en) 2013-02-04 2019-06-04 Ubiquiti Networks, Inc. Radio system for long-range high-speed wireless communication
US11909087B2 (en) 2013-02-04 2024-02-20 Ubiquiti Inc. Coaxial RF dual-polarized waveguide filter and method
US10819037B2 (en) 2013-02-04 2020-10-27 Ubiquiti Inc. Radio system for long-range high-speed wireless communication
US10205471B2 (en) 2013-10-11 2019-02-12 Ubiquiti Networks, Inc. Wireless radio system optimization by persistent spectrum analysis
US10623030B2 (en) 2013-10-11 2020-04-14 Ubiquiti Inc. Wireless radio system optimization by persistent spectrum analysis
US11804864B2 (en) 2013-10-11 2023-10-31 Ubiquiti Inc. Wireless radio system optimization by persistent spectrum analysis
US11057061B2 (en) 2013-10-11 2021-07-06 Ubiquiti Inc. Wireless radio system optimization by persistent spectrum analysis
US11196141B2 (en) 2014-04-01 2021-12-07 Ubiquiti Inc. Compact radio frequency antenna apparatuses
US10566676B2 (en) 2014-04-01 2020-02-18 Ubiquiti Inc. Compact radio frequency antenna apparatuses
US11978945B2 (en) 2014-04-01 2024-05-07 Ubiquiti Inc. Compact radio frequency antenna apparatuses
US11296805B2 (en) 2014-06-30 2022-04-05 Ubiquiti Inc. Wireless radio device alignment tools and methods
US10069580B2 (en) 2014-06-30 2018-09-04 Ubiquiti Networks, Inc. Wireless radio device alignment tools and methods
US10812204B2 (en) 2014-06-30 2020-10-20 Ubiquiti Inc. Wireless radio device alignment tools and methods
US11736211B2 (en) 2014-06-30 2023-08-22 Ubiquiti Inc. Wireless radio device alignment tools and methods
US10367592B2 (en) 2014-06-30 2019-07-30 Ubiquiti Networks, Inc. Wireless radio device alignment tools and methods
EP3207592A4 (de) * 2014-10-14 2018-05-23 Ubiquiti Networks, Inc. Signalisolierungsummantelungen und reflektoren für eine antenne
CN109244663A (zh) * 2014-10-14 2019-01-18 优倍快网络公司 用于天线系统的扼流护罩装置
WO2016061021A1 (en) 2014-10-14 2016-04-21 Ubiquiti Networks, Inc. Signal isolation shrouds and reflectors for antenna
CN105762529A (zh) * 2014-10-14 2016-07-13 优倍快网络公司 抛物面天线反射装置、其安装方法、扼流护罩
US10136233B2 (en) 2015-09-11 2018-11-20 Ubiquiti Networks, Inc. Compact public address access point apparatuses
US10757518B2 (en) 2015-09-11 2020-08-25 Ubiquiti Inc. Compact public address access point apparatuses
SE1930225A1 (en) * 2019-06-26 2020-12-27 Leax Arkivator Telecom Ab AN ANTENNA WITH REDUCED BACK-LOBE RADIATION
SE544567C2 (en) * 2019-06-26 2022-07-19 Leax Arkivator Telecom Ab An antenna with reduced back-lobe radiation

Also Published As

Publication number Publication date
FR2963487A1 (fr) 2012-02-03
FR2963487B1 (fr) 2013-03-22

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