EP1516393A1 - Double polarization dual-band radiating device - Google Patents
Double polarization dual-band radiating deviceInfo
- Publication number
- EP1516393A1 EP1516393A1 EP03760720A EP03760720A EP1516393A1 EP 1516393 A1 EP1516393 A1 EP 1516393A1 EP 03760720 A EP03760720 A EP 03760720A EP 03760720 A EP03760720 A EP 03760720A EP 1516393 A1 EP1516393 A1 EP 1516393A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radiating element
- dipoles
- dipole
- cavity
- radiating
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
-
- 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
- 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
- H01Q19/108—Combination of a dipole with a plane reflecting surface
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/001—Crossed polarisation dual antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
- H01Q5/42—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more imbricated arrays
Definitions
- the invention relates to antennas and their radiating elements usable in particular in the base stations of cellular radiocommunication networks of GSM or UMTS type for example.
- a radiating element with double polarization can be formed of two radiating dipoles, each dipole being constituted by two strands of collinear conductors. The length of each strand is substantially equal to a quarter of the working wavelength.
- the dipoles are mounted on a structure allowing their supply and their positioning above a reflector (ground plane). This allows, by reflection of the rear radiation of the dipoles, to refine the directivity of the radiation diagram of the assembly thus formed.
- the dipoles can radiate or receive electromagnetic waves according to two polarization channels, for example a horizontal polarization channel and a vertical polarization channel or also according to two polarization channels offset by an angle of ⁇ 45 "from horizontal or vertical.
- inter-band decoupling basically depends on the relative orientation of the second radiating element placed in the center of the first.
- the parallel dipoles of the elements operating in the frequency bands FI and F2 are insufficiently decoupled in the upper frequency band of frequency F2 for which the peripheral dipoles have a large dimension relative to the wavelength corresponding to the frequency F2 .
- the interaction between the peripheral dipoles operating at the frequency FI and the crossed dipoles operating at the frequency F2 is due both to direct radiation, the dipoles being in direct visibility, but also to radiation reflected by the reflector.
- the perpendicular channels of the two radiating elements are well decoupled by virtue of this geometric orthogonality.
- the invention aims to improve the situation.
- the dual-polarized dual-band radiating device comprises a first radiating element operating in a first frequency band FI which is formed by four dipoles arranged in a square and a second radiating element operating in a second frequency band F2 which is formed of at least one dipole disposed in the center of the square of the dipoles forming the first radiating element, each dipole being fed at its center by a balun.
- the first and second radiating elements are arranged above a reflector.
- the dipoles forming the first radiating element and the baluns are produced in the same metal plate, each balun of a dipole being formed by a short-slit line cut in the metal plate in a direction perpendicular to the axis of the dipole.
- the second radiating element is formed by at least one dipole disposed inside a cavity opening into the center of the metal plate.
- the metal plate and the cavity can be made in one piece, by stamping for example.
- the second radiating element operating in the frequency band F2 is then fixed inside and in the center of the cavity, the bottom of which serves as an electric short-circuit plane for at least one balun or balun used to supply the second element.
- the first radiating element and the second radiating element exhibit a very weak electromagnetic interaction. This is only due to the diffraction of the edge of the cavity. In this way the decoupling between the two frequency bands is very strong whatever the relative orientation of the dipole (s) forming the second radiating element inside the cavity, ie its polarization.
- FIG. 1 shows a first embodiment of a first radiating device with double polarization capable of operating in two different frequency bands according to the invention
- - Figure 2 shows a view along section AA of Figure 1.
- FIG. 3 is a perspective view of the device shown in Figures 1 and 2.
- - Figure 4 is an alternative embodiment of the first radiating element of Figure 1 - Figure 5 shows a second embodiment of a device according the invention
- FIG. 6 is a view along section AA of the device in FIG. 5.
- FIG. 7 is a perspective view of the device in FIGS. 5 and 6.
- FIG. 8 is a partial perspective view of a collinear network formed on the one hand of dual-band and bipolarized radiating elements of the type described in FIG. 7 and of single-band and bipolarized radiating elements of the same type as the elements central radiators of figure 7.
- the drawings essentially contain elements of a certain character. They can therefore not only serve to better understand the description, but also contribute to the definition of the invention, if necessary.
- the device shown in Figures 1, 2 and 3 where the homologous elements are represented with the same references, shows four dipoles referenced from 1 to 4 forming a square, cut from a metal plate 5 having a central hole 6 into which the open end of a radiating cavity 7.
- the side of the square formed by each dipole has a typical length equal to the half wavelength of the IF wave radiated by the dipoles for an opening at half power of the neighboring beam 65 ° in the horizontal plane.
- the length (1) of a dipole determines its impedance and can be greater or less depending on the thickness and width of the dipole. The greater this thickness, the shorter the length of the dipole.
- the side (d) of the square is determined according to the half-power opening which is sought and which can have a value different from 65 ° and the length of the dipoles is adjusted to ensure the adaptation d impedance, usually 50 Ohms, of the pair of parallel dipoles associated to form a polarization path with directional diagram.
- the dipoles 1 to 4 and the cavity 7 can be made in one piece by cutting and stamping the metal plate 5.
- Each dipole 1 to 4 is supplied by a balun referenced respectively from 8 to 11, of the "balun" type formed by a short slit line cut in the metal plate
- Each balun constitutes a support arm for the corresponding dipole.
- the plate 5 is formed around the hole 6 for the passage of the cavity 7 by a concentric ring 12 having on its outer periphery and in two directions at right angles protrusions or arms 13 to 16 of shapes for example, rectangular, bevelled or trapezoidal, respectively connecting the crown 12 to the dipoles 1 to 4.
- the radial length (h) of the arms is preferably not zero, for example greater than 0.05 ⁇ l so as to avoid direct contact of the inner edge of the dipoles with the outer edge of the ring 12 and thus minimize the interaction between the current flowing on the dipole and the currents flowing on the ring 12.
- the average width (w) of the arms is typically 5 to 10 times the width of the slotted line which is moreover very small compared to the wavelength ⁇ l corresponding to the frequency FI.
- the width of the crown 12 is determined to be sufficient both mechanically to support the dipoles and on the radio level to stabilize the directivity of the radiation patterns of the cavity 7 in the second frequency band F2, making less fluctuating the half-power opening of the radiation patterns as a function of frequency.
- This width is preferably greater than 5 / 100th of the wavelength ⁇ 2 corresponding to the frequency F2.
- the dipoles 1 to 4 are supplied at their base, that is to say at the open end of the slotted lines of the baluns 8 to 11 by means, for example, of coaxial cables referenced respectively from 17 to 20.
- the dipoles 2 and 4 geometrically parallel on two opposite sides of the square are supplied at equal phase and amplitude by two identical coaxial lines 18 and 20 and an association tee 21 to form a polarization path with directional diagram , like a classical network of two parallel dipoles.
- the coaxial supply lines 17, 18, 19, 20 of the dipoles are arranged respectively along and on one side of the baluns 8, 9, 10, 11.
- the external conductive sheath of the coaxial lines 17 to 20 is in electrical contact with the base of the first half of the dipole it supplies and with the plate 5, and the central conductor is connected to the base of the other half of the same dipole.
- Two orthogonal polarization paths are thus obtained, the radiation patterns of which are substantially identical.
- this mode of association is not limiting, and other modes can be envisaged.
- the symmetrizers of the dipoles are slit lines cut in the plate 5 in the form of meanders.
- the meanders of each slotted line must be in sufficient number so that the slotted line has a length substantially equal to a quarter of the wavelength of the IF frequency wave radiated by the first radiating element.
- the slit lines can take other forms, they can for example as shown in Figure 4 where the elements homologous to those of FIG. 1 bear the same references, being formed by a circular section followed by a straight section leading to the supply base of a dipole.
- the circular section can be anywhere on the crown 12. However to avoid coupling between the waves of frequencies FI and F2, it is preferable that it is not near the edge of the hole 6 but rather in the middle of the crown 12.
- the radiating plate 5 is in electrical contact with the edge 7a of the cavity.
- the cavity 7 is excited in its center by a radiating element 23 operating on the second frequency F2.
- This radiating element 23 can be of simple dipole type for the case of operation in single polarization mode or of crossed dipole type, or turnstile commonly called in English "turnstile", for the case of operation in polarization mode orthogonal, or any other type of radiating elements suitable for other types of polarization including circular.
- the bottom 7b of the cavity 7 is closed so that the radiation from the interior radiating element 23 is unidirectional and directed towards the front of the cavity 7.
- each balun is formed by a first conductive tube 24 and a second conductive tube 25 of lengths substantially equal to a quarter of the wavelength of the frequency wave F2.
- the conductors 24 and 25 are in electrical connection by their respective ends with the supply base of each half of a dipole of the radiating element 23 and the bottom 7b of the cavity.
- the first tube 24 is traversed along its longitudinal axis by a central conductor 26, one end of which is connected to the supply base of the half dipole opposite to that to which it is connected by one of its ends and the other end of which can be connected to the central conductor of a power connector or possibly to the central conductor of a coaxial cable not shown.
- the tubes 24 and 25 thus form with the central conductor 26 a coaxial line transforming impedance for the dipole to which they are connected.
- the depth of the cavity 7 is close to a quarter of the wavelength ⁇ 2 of the radiated wave of frequency F2 of the radiating element 23 inside the cavity.
- the height of the radiating element 23 relative to the bottom 7b of the cavity is also close to a quarter of the wavelength ⁇ 2 while being less than the depth of the cavity 7.
- the diameter of the cavity 7 can vary within wide proportions, for example between 0.45 ⁇ 2 and ⁇ 2, for half-power openings of less than 90 ° of the radiation patterns in the diagonal planes inclined by ⁇ 45 ° relative to the planes principal E and H of the dipole inside the cavity.
- the spacing necessary between the dipoles 1 to 4 of the radiating plate 5 operating at the frequency FI can limit the maximum diameter of the cavity 7.
- a diameter of 80mm and a cavity depth of 40mm are suitable for producing an aperture diagram at half power about 65 ° in the GSM1800 or UMTS band.
- the cavity 7 which supports the plate 5 is fixed on a reflector 24 of sufficient dimensions to allow the electromagnetic fields radiated behind the dipoles on the reflector to be returned to the front.
- the reflector 24 is intended to render the radiation of the dipoles of the radiating structure unidirectional.
- the reflector 24 may include low walls whose role is to stiffen the structure but also to act on the directivity of the radiated diagrams.
- the height of the dipoles of the radiating plate 5 with respect to the reflector 24 can typically vary from ⁇ l / 8 to ⁇ l / 4 in the frequency band FI of wavelength ⁇ l.
- the dipoles 1 to 4 of the plate 5 are partly raised relative to the plane formed by the opening of the cavity 7, each dipole being divided into three parts, a lower part respectively lb, 2b, 3b, 4b located in the plane of the plate 5 and two upper parts respectively la, le; 2a, 2c; 3a, 3c; 4a, 4c located on either side of the lower part.
- This elevation which preferably must retain the geometric symmetry of the structure, can also be done by tilting the parts of the dipoles located beyond the zones of the corresponding baluns 8 to 11.
- dipoles Various others geometric shapes can be envisaged to produce dipoles, the only condition being respect for the symmetry of the radiating structure, that is to say the identity of the dipoles, if not of the four at least two by two by pairs of parallel dipoles.
- the symmetry of the dipoles in pairs means that two parallel dipoles have the same total length so that they have the same impedance and that their respective radiation is substantially the same.
- the two pairs of dipoles are not necessarily identical because each pair of dipoles generates an independent bias path.
- the symmetry in question is a symmetry with respect to the center (O) of the square formed by the four dipoles.
- the structures of the radiating elements in FIGS. 1 to 7 are very simple and make it possible to produce dual-band radiating structures having two orthogonal polarization paths in each frequency band, inclined for example, as shown in FIGS. 1 and 5, at low cost. , ⁇ 45 ° from a vertical direction w '.
- the four channels thus formed are strongly decoupled from each other, typically 30 dB, and radiate in each frequency band according to unidirectional directivity diagrams having half-power openings of less than 90 ° in the horizontal plane, for example 65 °.
- collinear alignments can be made of a plurality of such radiating structures to form vertical linear networks of high gain, for example 18dBi, dual-band having two orthogonal polarization channels inclined by ⁇ 45 ° relative to a vertical direction. w 'in each frequency band.
- the embodiment of the network shown in FIG. 8 comprises on the one hand dual-band and bipolarized radiating elements of the type described in FIG. 7 operating in the bands FI (GSM900) and F2 (UMTS and / or DCS) and d 'other hand of bipolarized single-band radiating elements operating in the band F2 of the same type as the central elements of Figure 7.
- the pitch of the network for the band F2 is half the pitch of the network for the band IF. It is thus possible to build a highly directive network with regular pitch, dual-band and bipolarized having good polarization purity and a strong decoupling between the different channels.
- all the radiating elements operating in the band F2 have substantially the same phase center due to their identity, this being located on the central axis of the cavity, axis perpendicular to the plane of the opening of the cavity .
- This property greatly facilitates the electrical pointing (or Tilt) of the beam by action on the phase shifts between radiating elements and also allows better alignment of the phases of the radiating elements in the frequency band for greater directivity of the antenna.
- Radiating elements produced in accordance with those of the invention described above and operating in the GSM1800, GSM 1900 and UMTS frequency bands have made it possible to obtain insulation between the channels close to 30dB, with standing wave ratios relative to 50 Ohms for all radiating elements less than 1.7: 1 and half-power openings of the directivity diagrams close to 65 ° in the horizontal plane for gains close to 9dBi in the two frequency bands.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Aerials With Secondary Devices (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Polarising Elements (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0207872 | 2002-06-25 | ||
FR0207872A FR2841390B1 (en) | 2002-06-25 | 2002-06-25 | DUAL POLARIZATION TWO-BAND RADIATION DEVICE |
FR0215350A FR2841391B3 (en) | 2002-06-25 | 2002-12-05 | DUAL POLARIZATION TWO-BAND RADIATION DEVICE |
FR0215350 | 2002-12-05 | ||
PCT/FR2003/001745 WO2004001902A1 (en) | 2002-06-25 | 2003-06-11 | Double polarization dual-band radiating device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1516393A1 true EP1516393A1 (en) | 2005-03-23 |
EP1516393B1 EP1516393B1 (en) | 2010-01-20 |
Family
ID=29720859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03760720A Expired - Lifetime EP1516393B1 (en) | 2002-06-25 | 2003-06-11 | Double polarization dual-band radiating device |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP1516393B1 (en) |
CN (1) | CN100570953C (en) |
AT (1) | ATE456168T1 (en) |
AU (1) | AU2003255660A1 (en) |
DE (1) | DE60331067D1 (en) |
ES (1) | ES2339764T3 (en) |
FR (1) | FR2841391B3 (en) |
PT (1) | PT1516393E (en) |
WO (1) | WO2004001902A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202005015708U1 (en) | 2005-10-06 | 2005-12-29 | Kathrein-Werke Kg | Dual-polarized broadside dipole array, e.g. for crossed antennas, has a dual-polarized radiator with polarizing planes and a structure like a dipole square |
US7358924B2 (en) | 2005-10-07 | 2008-04-15 | Kathrein-Werke Kg | Feed network, and/or antenna having at least one antenna element and a feed network |
US8525736B2 (en) | 2007-07-05 | 2013-09-03 | Mitsubishi Cable Industries, Ltd. | Antenna device |
CN101425626B (en) | 2007-10-30 | 2013-10-16 | 京信通信系统(中国)有限公司 | Wide-band annular dual polarized radiating element and linear array antenna |
EP2120293A1 (en) * | 2008-05-16 | 2009-11-18 | Kildal Antenna Consulting AB | Improved broadband multi-dipole antenna with frequency-independent radiation characteristics |
EP2343777B1 (en) | 2009-05-26 | 2015-10-07 | Huawei Technologies Co., Ltd. | Antenna device |
CN102013560B (en) | 2010-09-25 | 2013-07-24 | 广东通宇通讯股份有限公司 | Broadband high-performance dual-polarization radiation unit and antenna |
CN102723577B (en) * | 2012-05-18 | 2014-08-13 | 京信通信系统(中国)有限公司 | Wide-band annular dual polarized radiating element and array antenna |
CN106099328A (en) * | 2016-06-27 | 2016-11-09 | 广州杰赛科技股份有限公司 | A kind of Bipolarization antenna for base station |
TWI682585B (en) * | 2018-10-04 | 2020-01-11 | 和碩聯合科技股份有限公司 | Antenna device |
CN112582774B (en) * | 2019-09-30 | 2022-05-24 | 京信通信技术(广州)有限公司 | Antenna, radiating element thereof, radiating element balun structure and manufacturing method |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3789416A (en) * | 1972-04-20 | 1974-01-29 | Itt | Shortened turnstile antenna |
US3740754A (en) * | 1972-05-24 | 1973-06-19 | Gte Sylvania Inc | Broadband cup-dipole and cup-turnstile antennas |
DE2310672A1 (en) * | 1973-03-03 | 1974-09-19 | Fte Maximal Fernsehtech | ROOM ANTENNA FOR VHF AND / OR UHF TELEVISION AREAS |
US4218685A (en) * | 1978-10-17 | 1980-08-19 | Nasa | Coaxial phased array antenna |
DE19823749C2 (en) * | 1998-05-27 | 2002-07-11 | Kathrein Werke Kg | Dual polarized multi-range antenna |
WO2001084730A1 (en) * | 2000-05-02 | 2001-11-08 | Bae Systems Information And Electronic Systems Integration, Inc. | Low profile, broadband, dual mode, modified notch antenna |
-
2002
- 2002-12-05 FR FR0215350A patent/FR2841391B3/en not_active Expired - Lifetime
-
2003
- 2003-06-11 DE DE60331067T patent/DE60331067D1/en not_active Expired - Fee Related
- 2003-06-11 ES ES03760720T patent/ES2339764T3/en not_active Expired - Lifetime
- 2003-06-11 WO PCT/FR2003/001745 patent/WO2004001902A1/en not_active Application Discontinuation
- 2003-06-11 AU AU2003255660A patent/AU2003255660A1/en not_active Abandoned
- 2003-06-11 CN CN03814895.1A patent/CN100570953C/en not_active Expired - Fee Related
- 2003-06-11 PT PT03760720T patent/PT1516393E/en unknown
- 2003-06-11 AT AT03760720T patent/ATE456168T1/en not_active IP Right Cessation
- 2003-06-11 EP EP03760720A patent/EP1516393B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2004001902A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU2003255660A1 (en) | 2004-01-06 |
CN1663075A (en) | 2005-08-31 |
ES2339764T3 (en) | 2010-05-25 |
CN100570953C (en) | 2009-12-16 |
PT1516393E (en) | 2010-04-15 |
FR2841391A1 (en) | 2003-12-26 |
FR2841391B3 (en) | 2004-09-24 |
WO2004001902A1 (en) | 2003-12-31 |
ATE456168T1 (en) | 2010-02-15 |
EP1516393B1 (en) | 2010-01-20 |
DE60331067D1 (en) | 2010-03-11 |
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