WO2008065148A2 - Dispositif d'alimentation d'une antenne à réflecteur - Google Patents
Dispositif d'alimentation d'une antenne à réflecteur Download PDFInfo
- Publication number
- WO2008065148A2 WO2008065148A2 PCT/EP2007/062964 EP2007062964W WO2008065148A2 WO 2008065148 A2 WO2008065148 A2 WO 2008065148A2 EP 2007062964 W EP2007062964 W EP 2007062964W WO 2008065148 A2 WO2008065148 A2 WO 2008065148A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- waveguide
- antenna
- lens
- reflector
- length
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/24—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave constituted by a dielectric or ferromagnetic rod or pipe
Definitions
- the present invention relates to a reflector telecommunication antenna, used in particular for mobile communication networks.
- the invention particularly relates to the supply device of such an antenna.
- 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 supply device transmitting the electromagnetic waves emitted or received by the antenna.
- the antenna feed device is located along the axis of symmetry of the antenna in the portion of the reflector having the concavity and has as the whole of the antenna a symmetry of revolution about this axis.
- the antenna supply device comprises a waveguide which may be of rectangular section or of circular section with a conical or cylindrical radiating aperture.
- these antennas provide a low-performance primary radiation spectrum.
- a cylindrical wall or skirt usually covered internally with an absorbent coating, is added around the reflector, in particular to limit lateral radiation.
- These antennas have a high overflow loss, and it is necessary to use a skirt of high height.
- US-4,673,945 discloses an antenna having a waveguide placed in a conductive tube whose conical end projects out of the tube, forming a concave surface covered with a conductive layer. This results in an increase in gain and a decrease in lateral lobes.
- US-2003/0184486 discloses a feed device for a parabolic reflector antenna which comprises a circular section hollow waveguide whose radiating end is filled with a bar made of dielectric material.
- the outer end of the bar is covered with a cap so as to reflect the waves towards the main reflector.
- AA KISCHK's article (IEE Proceedings, 136 (2), 1989, 169-171) describes a parabolic reflector antenna comprising a circular section waveguide.
- the waveguide is filled by a bar made of dielectric material, such as plexiglass.
- the bar protrudes from the opening of the waveguide with a length of 0.15 ⁇ .
- the cone tip shape of the end of the dielectric bar is determined to decrease cross polarization.
- the present invention aims to eliminate the disadvantages of the prior art, and in particular to improve the primary radiation spectrum of the antenna by reducing the side lobes and frequency dependence.
- the object of the invention is also to propose a device for feeding a reflector antenna which increases the performances in cross polarization and the gain of the antenna.
- Another object of the invention is to propose an antenna requiring a skirt of lesser height.
- the object of the present invention is a device for feeding an antenna comprising a reflector into which a waveguide of circular or rectangular section opens, comprising at its end a cylindrical or conical radiating aperture.
- a lens of dielectric material is inserted partially inside said opening.
- the portion of the lens protruding out of the waveguide has substantially the shape of a truncated cone and has its smaller diameter end facing outward. This end comprises a central cavity whose shape is given by the solution of a polynomial equation of type "b + ax + ex 2 + dx 3 " or a logarithmic equation.
- the portion of the lens protruding out of the waveguide has substantially the shape of a truncated cone whose largest diameter is between 0.5 ⁇ and ⁇ , where ⁇ is the length of the electromagnetic wave.
- the largest diameter is of the order of 0.85 ⁇ .
- the portion of the lens protruding out of the waveguide has substantially the shape of a truncated cone whose smallest diameter is between 0.5 ⁇ and 0.9 ⁇ , where ⁇ is the length of the guided electromagnetic wave.
- the smallest diameter is of the order of 0.70 ⁇ .
- the length of the part of the lens situated outside the waveguide is between 0.4 ⁇ and 0.7 ⁇ , where ⁇ is the length of the electromagnetic wave.
- the length is of the order of 0.55 ⁇ .
- the central cavity of the lens is extended by vertical edges whose height is between 0.04 ⁇ and 0.1 ⁇ , where ⁇ is the length of the guided electromagnetic wave.
- the height of the vertical edges is of the order of 0.07 ⁇ .
- a trap is associated with said lens.
- the presence of the trap creates a mask effect that conceals part of the signal, but avoids overflow losses and improves the antenna's primary radiation pattern.
- the trap associated with the lens is a trap called "quarter wave". Instead of the trap, one could also use a ring of dielectric material which contributes to reduce side lobes.
- a reflector antenna comprising a feed device comprising a reflector into which a waveguide of circular or rectangular cross-section opens, comprising at its end a cylindrical or conical radiating aperture.
- a lens of dielectric material is inserted partially inside said opening.
- the portion of the lens protruding out of the waveguide has substantially the shape of a truncated cone. Its smaller diameter end is outwardly facing and comprises a central cavity whose shape is given by the solution of a polynomial equation of type "b + ax + ex 2 + dx 3 " or a logarithmic equation.
- the present invention has the advantage of increasing the gain and cross-polarization performance of the antenna.
- the invention allows the use of a skirt of lower height which reduces the size of the antenna.
- FIGS. 1A and 1B show in section conventional antennas
- FIG. 2 shows an oblique sectional view of the opening of a waveguide provided with a lens according to the present invention
- FIG. 3 shows a sectional view of an alternative embodiment of the invention
- FIG. 4 represents in section and in perspective, a "quarter wave" trap
- FIGS. 5A and 5B compare the primary radiation spectra, respectively in a horizontal polarization plane and in a vertical polarization plane, of an antenna provided with a conventional feed device comprising a trap on the one hand, and an antenna provided with the feeding device according to the invention on the other hand.
- the radiation R in decibels (dB) is given on the ordinate, and in abscissa the angle ⁇ of deviation from the axis of the antenna in degrees.
- An antenna 1 of the prior art, shown in FIG. 1, comprises a reflector 2 having a concavity, for example having the shape of a paraboloid of revolution about an axis AA 3 of symmetry of the antenna 1, and a power supply device 4 transmitting the electromagnetic waves emitted or received by the antenna 1.
- a cylindrical wall or skirt 5 internally covered with an absorbing coating 6, which limits the lateral radiation.
- the presence of the skirt 5 increases the wind angle of the antenna 1 and the risk of accumulation of elements such as water, dust or snow.
- a radome 7 which has a planar protective surface partitioning the space defined by the reflector 2 and the skirt 5 vis-à-vis elements external to the antenna.
- the transmission of the electromagnetic waves takes place in the antenna 1 with the aid of a waveguide 8 usually made of metal, for example brass or aluminum.
- the waveguide 8 may be of rectangular section or circular section, with a conical radiating aperture 9 as shown in Figure 1A or with a cylindrical radiating aperture 10 as shown in Figure 1B.
- FIG. 2 there is shown the cylindrical opening 20 of a waveguide 21 inside which is partially inserted a lens 22 in such a way that part 23 protrudes out of the waveguide.
- This portion 23 is substantially conical in shape whose tip was cut.
- the narrow end 24 of smaller diameter of the portion 23 faces outwards, and has a central cavity 25 of a particular shape given by the solution of a polynomial equation of type "b + ax + ex 2 + dx 3 "or a logarithmic equation.
- the central cavity 25 is extended by vertical edges 26 whose height is between 0.04 ⁇ and 0.1 ⁇ , and preferably of the order of 0.07 ⁇ , where ⁇ is the length of the guided electromagnetic wave.
- the length of the guided electromagnetic wave is usually between 10 and 50 mm.
- the protruding portion 23 of the lens 22 has a substantially conical shape whose largest diameter D is between 0.7 ⁇ and ⁇ , preferably of the order of 0.85 ⁇ , and the smallest diameter d is between 0, 5 ⁇ and 0.9 ⁇ , preferably of the order of 0.70 ⁇ .
- the length H of the portion 23 of the lens 22 which protrudes from the waveguide 21 is between 0.4 ⁇ and 0.7 ⁇ , and preferably of the order of 0.55 ⁇ .
- the other part 27 of the lens 22 placed in the opening 20 of the waveguide 21 has a series of recesses 28.
- the lens 22 is preferably of a low loss dielectric material and relatively insensitive to the frequency in the field considered.
- a material it is possible to choose a polystyrene, such as "REXOLITE” from the company “C-LEC”, or a polymethyl methacrylate (PMMA).
- the total length of the antenna can vary from 25 ⁇ to 200 ⁇ .
- FIG. 3 which illustrates another embodiment of the present invention, will now be considered.
- a "quarter-wave" ⁇ / 4 trap 30 is placed at the end 31 of a hollow waveguide 32.
- a lens 33 substantially similar in shape to that of Figure 2, is partially inserted inside the end of the waveguide 32.
- the presence of the trap 30 creates a mask effect that conceals part of the signal , but avoids overflow losses and improves the primary radiation pattern of the antenna.
- the trap one could also use a ring of dielectric material which contributes to reduce side lobes.
- FIG. 4 Another example of a trap 40 of this type is shown in an enlarged sectional view and in perspective in FIG. 4.
- the four compartments 41 that it comprises each have a width I which is equal to ⁇ / 4, that is to say a quarter wave.
- FIGS. 5A and 5B make it possible to compare the performances, respectively in the plane of the horizontal polarization and in that of the vertical polarization, obtained with a conventional antenna provided with a trap on the one hand (curves 50A and 50B) and an antenna equipped with a lens according to an embodiment of the invention on the other hand (curve 51 A and 51 B).
Landscapes
- Aerials With Secondary Devices (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0719146-4A BRPI0719146A2 (pt) | 2006-11-29 | 2007-11-28 | Dispositivo de alimentação de uma antena com refletor. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0655173A FR2909225B1 (fr) | 2006-11-29 | 2006-11-29 | Dispositif d'alimentation d'une antenne a reflecteur |
FR0655173 | 2006-11-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008065148A2 true WO2008065148A2 (fr) | 2008-06-05 |
WO2008065148A3 WO2008065148A3 (fr) | 2008-11-20 |
Family
ID=37758540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2007/062964 WO2008065148A2 (fr) | 2006-11-29 | 2007-11-28 | Dispositif d'alimentation d'une antenne à réflecteur |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080174504A1 (fr) |
EP (1) | EP1928055A1 (fr) |
CN (1) | CN101192714A (fr) |
BR (1) | BRPI0719146A2 (fr) |
FR (1) | FR2909225B1 (fr) |
WO (1) | WO2008065148A2 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109643855B (zh) * | 2017-06-30 | 2020-06-26 | 华为技术有限公司 | 多频段天线的天馈组件和多频段天线 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2185861A (en) * | 1985-01-16 | 1987-07-29 | Junkosha Co Ltd | Dielectric waveguide |
GB2188784A (en) * | 1986-03-25 | 1987-10-07 | Marconi Co Ltd | Wideband horn antenna |
US20030132888A1 (en) * | 1998-06-02 | 2003-07-17 | Channel Master Limited | Antenna feed and a reflector antenna system and a low noise block (LNB) receiver, both with such an antenna feed |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2761138A (en) * | 1946-05-10 | 1956-08-28 | Dora F Sherman | Isotropic radiator |
FR2498820A1 (fr) * | 1981-01-23 | 1982-07-30 | Thomson Csf | Source hyperfrequence bi-bande et antenne comportant une telle source |
US5907309A (en) * | 1996-08-14 | 1999-05-25 | L3 Communications Corporation | Dielectrically loaded wide band feed |
JP4263166B2 (ja) * | 2004-12-10 | 2009-05-13 | シャープ株式会社 | フィードホーン、電波受信用コンバータおよびアンテナ |
-
2006
- 2006-11-29 FR FR0655173A patent/FR2909225B1/fr not_active Expired - Fee Related
-
2007
- 2007-11-27 CN CNA2007101946330A patent/CN101192714A/zh active Pending
- 2007-11-27 US US11/945,721 patent/US20080174504A1/en not_active Abandoned
- 2007-11-28 WO PCT/EP2007/062964 patent/WO2008065148A2/fr active Application Filing
- 2007-11-28 BR BRPI0719146-4A patent/BRPI0719146A2/pt not_active IP Right Cessation
- 2007-11-28 EP EP07121796A patent/EP1928055A1/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2185861A (en) * | 1985-01-16 | 1987-07-29 | Junkosha Co Ltd | Dielectric waveguide |
GB2188784A (en) * | 1986-03-25 | 1987-10-07 | Marconi Co Ltd | Wideband horn antenna |
US20030132888A1 (en) * | 1998-06-02 | 2003-07-17 | Channel Master Limited | Antenna feed and a reflector antenna system and a low noise block (LNB) receiver, both with such an antenna feed |
Non-Patent Citations (2)
Title |
---|
BORYSSENKO A O: "DIELECTRIC-CORE CONICAL-HORN ANTENNAS WITH RECTANGULAR-WAVEGUIDE FEED FOR POINT-TO-POINT MILLIMETER-WAVE COMMUNICATION" IEEE ANTENNAS AND PROPAGATION MAGAZINE, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 42, no. 2, 1 avril 2000 (2000-04-01), pages 129-136, XP000928462 ISSN: 1045-9243 * |
KILDAL P-S ET AL: "SCALAR HORN WITH SHAPED LINS IMPROVES CASSEGRAIN EFFICIENTS" IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. AP-32, 1 octobre 1984 (1984-10-01), pages 1094-1100, XP003005511 ISSN: 0018-926X * |
Also Published As
Publication number | Publication date |
---|---|
EP1928055A1 (fr) | 2008-06-04 |
WO2008065148A3 (fr) | 2008-11-20 |
BRPI0719146A2 (pt) | 2014-02-04 |
FR2909225B1 (fr) | 2010-08-20 |
CN101192714A (zh) | 2008-06-04 |
US20080174504A1 (en) | 2008-07-24 |
FR2909225A1 (fr) | 2008-05-30 |
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