EP2772985B1 - System zum Befestigen einer flachen Antennenkuppel auf einem Konkavreflektor einer Antenne - Google Patents

System zum Befestigen einer flachen Antennenkuppel auf einem Konkavreflektor einer Antenne Download PDF

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Publication number
EP2772985B1
EP2772985B1 EP13305221.7A EP13305221A EP2772985B1 EP 2772985 B1 EP2772985 B1 EP 2772985B1 EP 13305221 A EP13305221 A EP 13305221A EP 2772985 B1 EP2772985 B1 EP 2772985B1
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EP
European Patent Office
Prior art keywords
reflector
antenna
radome
lower flange
flange part
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.)
Active
Application number
EP13305221.7A
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English (en)
French (fr)
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EP2772985A1 (de
Inventor
Armel Lebayon
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.)
Nokia Shanghai Bell Co Ltd
Original Assignee
Alcatel Lucent Shanghai Bell Co Ltd
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 Shanghai Bell Co Ltd filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to EP13305221.7A priority Critical patent/EP2772985B1/de
Priority to CN201480010762.8A priority patent/CN105122543B/zh
Priority to PCT/IB2014/059234 priority patent/WO2014132190A1/en
Publication of EP2772985A1 publication Critical patent/EP2772985A1/de
Application granted granted Critical
Publication of EP2772985B1 publication Critical patent/EP2772985B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome

Definitions

  • the present invention relates to the field of radio frequency antennas, in particular to a system for fixing a plane radome on a concave reflector of an antenna.
  • Radio frequency antennas are usually used for mobile communication networks.
  • Such an antenna comprises a main reflector usually having a concavity, which may have for example the shape of a paraboloid of revolution about the axis of symmetry of the antenna, and a feeding device located along the axis of symmetry of the antenna for transmitting electromagnetic waves transmitted or received by the antenna.
  • a radome is associated with an impervious protective surface which partitions the space defined by the reflector vis-à-vis the outside. This radome can be flexible or rigid.
  • a rigid flat radome the most used at present, has the advantage of good resistance to the external climatic environment such as rain, wind or snow.
  • the fastening system must also allow rapid disassembly / reassembly of the radome on the reflector without degradation.
  • the antennas with a filiform beam (or "pencil beam antenna” in English), used for the radio link applications, have a characteristic radiation pattern which comprises a main lobe with a quasi-suppression of side lobes in particular in the direction of the back (or "backward direction” in English) ie from +90 to +180 degrees on the one hand and from -90 to -180 degrees on the other hand.
  • the leak radiation observed at the rear of the antenna has several sources.
  • a usual solution is to use a shielding braid which improves the electrical contact between the different parts used for fixing the radome.
  • These shielding braids can be added in all junction interfaces contacting two parts such as the skirt, the reflector, the flange and the reflector.
  • the main disadvantages of this solution are its additional cost, due in particular to the increase in the number of parts, as well as the increase in the time required for the assembly of the antenna. This assembly requires precise handling, which increases the cost of installation.
  • the document US 6295028 discloses a dual-band antenna comprising radiating elements aligned on a substantially plane reflector. In order to widen the beam in the highest frequency band, the lateral edge of the reflector is modified to form a longitudinal groove.
  • the groove is metallic or metallized plastic.
  • the lower flange portion has a shape adapted to the profile of the outer surface of the reflector, and has at least one trap.
  • the trap may be placed on the upper surface of the lower flange portion facing the outer surface of the reflector, or on the side surface of the lower flange portion facing the upper flange portion.
  • the groove has straight or inclined sidewalls.
  • the groove may have a section selected from a flat-bottomed U-shaped section, a rounded-bottom U-shaped section, and a V-shaped section.
  • the width of the groove is of the order of a fraction of the working wavelength of the antenna.
  • the width of the groove is of the order of one-tenth of the working wavelength of the antenna.
  • the groove has a depth of about one quarter of the working wavelength of the antenna.
  • the trap further comprises a flange along the groove.
  • the width of the flange is of the order of a quarter of the working wavelength of the antenna.
  • a surface of the lower flange portion is in contact with a surface of the upper flange portion, the surface of the lower flange portion being at an acute angle with the surface of the flange top portion.
  • the upper surface of the lower flange portion further comprises at least one relief.
  • this relief has a height less than 5 mm.
  • the upper surface of the lower flange portion is at an acute angle with the outer surface of the reflector.
  • This particular shape of the lower flange portion is combined with the presence of traps so as to reduce the leakage radiation of the RF waves. In this way, no braiding shield is necessary, and all the corresponding disadvantages are thus avoided.
  • the microwave antennas comprising this fixing device have higher performances than those of known antennas in terms of backward leakage radiation, due to wave overflow and diffraction, and forward / backward F / B ratio. .
  • a radiofrequency antenna with such a fixture is a very important benefit to customers in the current and future network deployment, as this enhancement opens the door to denser network architectures with higher capacity due better radio isolation between the antennas.
  • the antenna is applicable to a wide range of microwave frequencies. It can also be applied to antennas whose reflector is not parabolic, such as antennas with rectangular reflector for base station.
  • the figure 1 illustrates in section the connection zone between a plane radome 1 and a concave reflector 2 .
  • the fastening device 3 comprises an upper flange portion 4 and a lower flange portion 5.
  • the peripheral dielectric flange 6 of the radome and the peripheral flange 7 conductive of the reflector 2 are sandwiched between the upper flange portion 4 and the portion lower flange 5 of the fastening device 3.
  • the upper flange 4 and the lower flange portion 5 of the fastener 3 are made of a conductive material, preferably metallic.
  • the upper flange portion 4 and the lower flange portion 5 of the fastener 3 are secured together, for example by screws, clips, or other similar means.
  • the main risk of such an assembly is the occurrence of radiofrequency wave leakage through gaps existing between the peripheral rim 6 of the radome 1 and the peripheral rim 7 of the reflector 2, between the peripheral rim 7 of the reflector 2 and the part lower flange 5, and between the lower flange portion 5 and the upper flange portion 4, thereby increasing the forward / backward ratio of the antenna radiation pattern.
  • Applicable standards such as ETSI Class 3, require a very high forward-to-back ratio to ensure a high level of radio isolation between antennas on the same site.
  • the upper flange portion 4 is for example here L-shaped which bears on the outer surface 10 of the flange peripheral 6 of the radome 1 by its first branch 11, and covers the peripheral edge 8 of the radome 1 and the peripheral edge 9 of the reflector 2 placed in an adjacent position by its second branch 12.
  • the lower flange portion 5 has a section whose shape is substantially triangular.
  • the general shape of the lower flange portion 5 is approximately that of a right triangle 13.
  • the length of the right triangle corresponds to the upper surface 14 of the lower flange portion 5 which cooperates with the outer surface 15 of the flange 5.
  • the height of the right triangle corresponds to the lateral surface 16 of the lower flange portion 5 which is in contact with a surface 17 of the second branch 12 of the upper flange portion 4.
  • the lateral surface 16 of the lower flange portion 5 is inclined, making an acute angle ⁇ with the plane 18 of the contact surface 17 of the second branch 12 of the upper flange portion 4. This inclination makes it possible to reduce the gap between the upper flange portion 4 and the lower flange portion 5 when the two pieces are clamped against each other. This shape makes it possible to improve the electrical contact with the upper part of flange 4.
  • the angle ⁇ is strictly greater than 0 °, and preferably about 10 °.
  • the trap 19 may be in the form of a channel with conductive walls. In the illustrated embodiment, the trap 19 is placed on the upper surface 14 of the lower flange portion 5, near the side surface 16. Other traps could also be placed on the upper surface 14 of the lower portion. 5, but also on the side surface 16.
  • the upper surface 14 of the lower flange portion 5 may further bear one or more reliefs 20 placed at the opposite end. These reliefs 20 have a height less than 5 mm, and preferably of the order of 1 mm.
  • the reliefs 20 make it possible to improve the contact between the upper surface 14 of the lower flange portion 5 and the outer surface 15 of the peripheral flange 7 of the reflector 2. Physical contact narrower between the lower flange portion 5 and the outer surface 15 of the reflector 2 could also be provided by an inclination of the upper surface 14 of the lower flange portion 5 forming an acute angle with the outer surface 15 of the reflector 2. This allows to reduce the gap between the lower flange 5 and the reflector 2 when the two parts are clamped against each other.
  • the figure 2 illustrates a perspective view of another embodiment of a lower flange portion 30 whose interior has been hollowed out from the surface corresponding to the hypotenuse 31 of the right triangle 32 which is approximately the shape of the portion lower flange 30.
  • the lower flange portion 30 consists of a conductive surface material such as a metal or a metallized plastic.
  • the lower flange portion 30 includes a throat-shaped trap 33 formed in the upper surface 34 of the lower flange portion 30.
  • the groove 33 is located proximate the side surface 35 of the lower flange portion 30 corresponding to the height of the right triangle 32.
  • the groove 33 has a width G and a depth P which depend on the wavelength ⁇ of the antenna. The operating principle of such a trap is based on the fact that it produces 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 width G of the groove 33 is of the order of one-tenth of the working wavelength ⁇ of the antenna.
  • the depth P of the groove 33 is of the order of a quarter of the working wavelength ⁇ of the antenna.
  • the groove 33 has side walls that can be straight or inclined.
  • the groove 33 may have a U-shaped section with a flat bottom, a U-shaped section with a rounded bottom or a V-shaped section for example.
  • the trap may further comprise a flange 36 along the groove 33.
  • the thickness E of the flange 36 is preferably of the order of a quarter of the working wavelength ⁇ of the antenna.
  • the difference in height H between the wall 37 of the groove 33 situated on the side of the flange 36 and the wall 38 of the groove 33 situated on the opposite side is very small, of the order of one-tenth of the wavelength. ⁇ working of the antenna.
  • the upper surface 34 and / or the lateral surface 35 of the lower flange portion 30 may comprise other traps.
  • the upper surface 34 of the part lower flange 30 may further carry one or more reliefs 39, for example forming ribs.
  • FIGS. 3a and 3b illustrate the radiation pattern of an antenna in the horizontal plane in the 18.7 GHz frequency band.
  • the continuous line 40 of reference represents the standard profile corresponding to the model class 3 ETSI.
  • the present invention is not limited to the described embodiments, but it is capable of many variants accessible to those skilled in the art without departing from the spirit of the invention.
  • the proposed solution is not limited to a particular domain of microwave frequencies, but can be applied to different frequency domains with a design adapted to the corresponding wavelength.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Aerials With Secondary Devices (AREA)

Claims (14)

  1. Vorrichtung zur Befestigung eines ebenen Randoms (1) auf einem konkaven Antennenreflektor (2), wobei das Random (1) eine Außenfläche und eine Innenfläche hat und der Reflektor eine Außenfläche und eine Innenfläche hat, wobei sich die Innenfläche des Randoms und die Innenfläche des Reflektors gegenüberstehen, wobei die Vorrichtung (3) umfasst
    - einen oberen Flanschteil (4), der auf der Außenfläche (10) des Randoms (1) platziert ist und den Umfangsrand (8, 9) des Reflektors (2) und des Randoms (1) bedeckt, und
    - einen unteren Flanschteil (5), der auf der Außenfläche (15) des Reflektors (2) platziert ist, mit einer Form, die an das Profil der Außenfläche (15) des Reflektors (2) angepasst ist, und mindestens eine Falle elektromagnetischer Wellen (19) aufweist, wobei die Falle (19) die Form einer Nut (33) mit leitender Oberfläche hat.
  2. Vorrichtung nach Anspruch 1, wobei die Falle (19) auf der oberen Fläche (14) des unteren Flanschteils (5) platziert ist, die der Außenfläche (15) des Reflektors (2) gegenübersteht, oder auf der seitlichen Fläche (16) des unteren Flanschteils (5), die dem oberen Flanschteil (4) gegenübersteht.
  3. Vorrichtung nach einem der Ansprüche 1 und 2, wobei die Nut gerade oder geneigte Seitenwände hat.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, wobei die Nut (33) einen Querschnitt hat, der aus einem Querschnitt in U-Form mit flachem Boden, einem Querschnitt in U-Form mit abgerundetem Boden oder einen Querschnitt in V-Form ausgewählt ist.
  5. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die Breite der Nut (33) zirka einem Bruchteil der Arbeitswellenlänge der Antenne entspricht.
  6. Vorrichtung nach Anspruch 5, wobei die Breite der Nut (33) zirka einem Zehntel der Arbeitswellenlänge der Antenne entspricht.
  7. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die Nut (33) eine Tiefe von zirka einem Viertel der Arbeitswellenlänge der Antenne hat.
  8. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die Falle (19) ferner eine Kante (36) entlang der Nut aufweist.
  9. Vorrichtung nach Anspruch 8, wobei die Breite der Kante (36) zirka einem Viertel der Arbeitswellenlänge der Antenne beträgt.
  10. Vorrichtung nach einem der vorangehenden Ansprüche, wobei eine Fläche (16) des unteren Flanschteils (5) im Kontakt mit einer Fläche (17) des oberen Flanschteils (4) ist, wobei die Fläche (16) des unteren Flanschteils (5) einen spitzen Winkel mit der Fläche (17) des oberen Flanschteils (4) bildet.
  11. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die obere Fläche (14) des unteren Flanschteils (4) mindestens ein Relief (20) trägt.
  12. Vorrichtung nach Anspruch 11, wobei das Relief (20) eine Höhe von unter 5 mm hat.
  13. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die obere Fläche (14) des unteren Flanschteils (4) einen spitzen Winkel mit der Außenfläche (15) des Reflektors (2) bildet.
  14. Funkfrequenzantenne, umfassend eine Befestigungsvorrichtung (3) des ebenen Randoms (1) auf einem konkaven Reflektor (2) nach einem der vorangehenden Ansprüche.
EP13305221.7A 2013-02-27 2013-02-27 System zum Befestigen einer flachen Antennenkuppel auf einem Konkavreflektor einer Antenne Active EP2772985B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13305221.7A EP2772985B1 (de) 2013-02-27 2013-02-27 System zum Befestigen einer flachen Antennenkuppel auf einem Konkavreflektor einer Antenne
CN201480010762.8A CN105122543B (zh) 2013-02-27 2014-02-25 用于将平面天线罩固定到天线的凹面反射器上的系统
PCT/IB2014/059234 WO2014132190A1 (en) 2013-02-27 2014-02-25 System for fastening a flat radome onto the concave reflector of an antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13305221.7A EP2772985B1 (de) 2013-02-27 2013-02-27 System zum Befestigen einer flachen Antennenkuppel auf einem Konkavreflektor einer Antenne

Publications (2)

Publication Number Publication Date
EP2772985A1 EP2772985A1 (de) 2014-09-03
EP2772985B1 true EP2772985B1 (de) 2018-08-08

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Application Number Title Priority Date Filing Date
EP13305221.7A Active EP2772985B1 (de) 2013-02-27 2013-02-27 System zum Befestigen einer flachen Antennenkuppel auf einem Konkavreflektor einer Antenne

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EP (1) EP2772985B1 (de)
CN (1) CN105122543B (de)
WO (1) WO2014132190A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3001504B1 (de) * 2014-09-24 2019-09-11 Alcatel- Lucent Shanghai Bell Co., Ltd Verbindungsvorrichtung zum Befestigen eines Elements mit einem flachen Rand auf einer Unterlage
WO2020182311A1 (en) * 2019-03-14 2020-09-17 Huawei Technologies Co., Ltd. Redirecting structure for electromagnetic waves

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581615A (en) * 1983-02-08 1986-04-08 Levy Stanley P Double reflector antenna with integral radome reflector support
JP3206016B2 (ja) * 1991-05-21 2001-09-04 凸版印刷株式会社 平面アンテナ
SE512439C2 (sv) * 1998-06-26 2000-03-20 Allgon Ab Dubbelbandsantenn
US7701409B2 (en) * 2005-06-29 2010-04-20 Cushcraft Corporation System and method for providing antenna radiation pattern control
JP4725378B2 (ja) * 2006-03-16 2011-07-13 日本電気株式会社 パラボラアンテナの組立法、組立用ジグ、および、レドーム取付金具
JP5308238B2 (ja) * 2009-05-28 2013-10-09 日本無線株式会社 保護ケースの防水構造
CN201523074U (zh) * 2009-07-15 2010-07-07 江苏华灿电讯股份有限公司 双极化智能一体化天线
US8259028B2 (en) * 2009-12-11 2012-09-04 Andrew Llc Reflector antenna radome attachment band clamp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
CN105122543B (zh) 2018-03-20
WO2014132190A1 (en) 2014-09-04
EP2772985A1 (de) 2014-09-03
CN105122543A (zh) 2015-12-02

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