FR2841390A1 - Double polarization dual-band radiating antenna, particularly for use in cellular radio communications, has first and second radiating elements produced in a common metal plate with the dipoles center-fed by baluns - Google Patents
Double polarization dual-band radiating antenna, particularly for use in cellular radio communications, has first and second radiating elements produced in a common metal plate with the dipoles center-fed by baluns Download PDFInfo
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- FR2841390A1 FR2841390A1 FR0207872A FR0207872A FR2841390A1 FR 2841390 A1 FR2841390 A1 FR 2841390A1 FR 0207872 A FR0207872 A FR 0207872A FR 0207872 A FR0207872 A FR 0207872A FR 2841390 A1 FR2841390 A1 FR 2841390A1
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- radiating element
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- radiating
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- 239000002184 metal Substances 0.000 title claims abstract description 18
- 230000010287 polarization Effects 0.000 title claims description 25
- 230000001413 cellular effect Effects 0.000 title description 2
- 239000004020 conductor Substances 0.000 claims description 8
- 230000005855 radiation Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000003993 interaction Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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- 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
- H01Q1/52—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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
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Dispositif rayonnant bi-bande a double polarisation. Dual-band radiating device with double polarization.
L'invention concerne les antennes et leurs elements rayonnants utilisables notamment dans les stations de base des reseaux de radiocommunication cellulaires de type GSM ou UMTS The invention relates to antennas and their radiating elements which can be used in particular in base stations of cellular radiocommunication networks of the GSM or UMTS type.
par exemple.for example.
Un element rayonnant a double polarisation peut etre forme de deux dipoles rayonnants, chaque dipole etant constitue par deux brins de conducteurs colineaires. La longueur de chaque brin est sensiblement egale au quart de la longueur d'onde de travail. Les dipoles vent montes sur une structure permettant leur alimentation et leur positionnement au dessus d'un reflecteur (plan-masse). Ceci permet, par reflexion du rayonnement arriere des dipOles, A radiating element with double polarization can be formed of two radiating dipoles, each dipole being constituted by two strands of colinear conductors. The length of each strand is approximately equal to a quarter of the working wavelength. The wind dipoles are mounted on a structure allowing them to be fed and positioned above a reflector (ground plane). This allows, by reflection of the rear radiation of the dipoles,
d'affiner la directivite du diagramme de rayonnement de ['ensemble ainsi forme. to refine the directivity of the radiation pattern of the assembly thus formed.
I1 est connu pour real i ser un di spo sitif rayonnant fonctionnant dans deux bandes de frequence et a polarisations orthogonales, de disposer un premier element rayonnant, forme par quatre dipoles en quadrature operant sur une premiere frequence F1, autour d'un deuxieme element rayonnant forme par deux dipoles croises en quadrature operant sur une I1 is known to real i ser a radiating device operating in two frequency bands and with orthogonal polarizations, to have a first radiating element, formed by four dipoles in quadrature operating on a first frequency F1, around a second radiating element formed by two crossed dipoles in quadrature operating on a
2 0 deuxieme frequence F2, ['ensemble de ces elements etant dispose au dessus d'un reflecteur. 2 0 second frequency F2, ['all of these elements being arranged above a reflector.
Selon leur orientation dans l'espace, les dipoles peuvent rayonner ou recevoir des ondes electromagnetiques suivant deux voies de polarisation, par exemple une vole de polarisation horizontale et une vole de polarisati on vertical e ou encore suivant deux voies de polari sation Depending on their orientation in space, the dipoles can radiate or receive electromagnetic waves along two polarization paths, for example a horizontal polarization flight and a vertical polarization flight or even according to two polarization paths
2 5 decalees d'un angle de 45 par rapport a lthorizontale ou la verticale. 2 5 offsets at an angle of 45 from horizontal or vertical.
Cependant le decouplage inter-bande depend fondamentalement de ['orientation relative du deuxieme element rayonnant place au centre du premier. En particulier les dip81es paralleles des elements fonctionnant dans les bandes de frequence F1 et F2 vent insuffisamment 3 0 decouples dans la bande de frequence superieure de frequence F2 pour laquelle les dip81es peripheriques ont une dimension grande par rapport a la longueur d'onde correspondent a la frequence F2. En effet ['interaction entre les dip81es peripheriques fonctionnant a la frequence F1 et les dipoles croises fonctionnant a la frequence F2 est due a la fois au rayonnement direct, les dip81es etant en visibilite directe, mais aussi au rayonnement f ' 2841390 reflechi par le reflecteur. En revanche les voies perpendiculaires des deux elements rayonnants vent bien decouplees en vertu de cette orthogonalite geometrique. Mais si cette orthogonalite n'est plus respectee, notamment si les dipoles de ['element rayonnant central ont des orientations arbitraires par rapport a ceux des dipoles peripheriques formant le premier element rayonnant alors un couplage inter-bande assez fort apparat entre les However, inter-band decoupling basically depends on the relative orientation of the second radiating element placed in the center of the first. In particular, the parallel dipoles of the elements operating in the frequency bands F1 and F2 are insufficiently 30 decouples in the higher frequency band of frequency F2 for which the peripheral dipoles have a large dimension in relation to the wavelength correspond to the frequency F2. Indeed, the interaction between the peripheral dipoles operating at frequency F1 and the crossed dipoles operating at frequency F2 is due both to direct radiation, the dip81es being in direct visibility, but also to radiation f '2841390 reflected by the reflector . On the other hand, the perpendicular channels of the two radiating elements are well decoupled by virtue of this geometric orthogonality. But if this orthogonality is no longer respected, in particular if the dipoles of the central radiating element have arbitrary orientations relative to those of the peripheral dipoles forming the first radiating element then a fairly strong inter-band coupling appears between the
differentes voies de transmission ou de reception des deux elements rayonnants. different transmission or reception channels of the two radiating elements.
Un autre desavantage de cette structure est que le rayonnement de ['element rayonnant central est perturbe par ['element rayonnant peripherique. En effet ce rayonnement est partiellement diffracte en particulier par les dipoles de ['element rayonnant peripherique, de sorte que le diagramme de rayonnement resultant presente dans le meilleur des cas des ondulations et, pour une orientation relative arbitraire des dipoles de ['element rayonnant central, ce diagramme est dissymetrique par rapport a l'axe principal de rayonnement Another disadvantage of this structure is that the radiation of the central radiating element is disturbed by the peripheral radiating element. Indeed this radiation is partially diffracted in particular by the dipoles of the peripheral radiating element, so that the resulting radiation diagram presents in the best of the cases ripples and, for an arbitrary relative orientation of the dipoles of the central radiating element , this diagram is asymmetrical with respect to the main axis of radiation
perpendiculaire au plan des dipoles. perpendicular to the plane of the dipoles.
Il reste done difficile d'obtenir un element rayonnant bi-bande simple a fabriquer possedant deux voies orthogonales a polarisation lineaire fortement decouplees dans une large bande de frequence. Il est a fortiori difficile de realiser un reseau directif bipolarise comportant It therefore remains difficult to obtain a simple to manufacture dual-band radiating element having two orthogonal channels with linear polarization highly decoupled in a wide frequency band. It is a fortiori difficult to realize a bipolarized directive network comprising
plusieurs elements rayonnants de ce genre, et offrant une bonne purete de polarisation. several radiating elements of this kind, and offering a good purity of polarization.
Sur un autre plan, il serait sonhaitable d'obtenir un element rayonnant avec deux voies orthogonales de polarisation ayant chacune un diagramme de rayonnement unidirectionnel et dont l'ouverture a ml-puissance dans les plans diagonaux c' est a dire des plans situes a On another level, it would be desirable to obtain a radiating element with two orthogonal polarization pathways each having a unidirectional radiation pattern and whose aperture at ml-power in the diagonal planes, ie planes located at
des plans principaux E et H de chaque dipole, soit substantiellement inferieure a 90 . of the main planes E and H of each dipole, ie substantially less than 90.
L'invention a pour but d'ameliorer la situation. The invention aims to improve the situation.
Le dispositif rayonnant bi-bande a double polarisation selon ['invention, comprend un premier element rayonnant fonctionnant dans une premiere bande de frequence Fl qui est 3 0 forme de quatre dipoles disposes en carre et un deuxieme element rayonnant fonctionnant dans une deuxieme bande de frequence F2 qui est forme d'au moins un dipole dispose au centre du carre des dipoles formant le premier element rayonnant, chaque dipole etant alimente en son centre par un symetriseur. Le premier et le deuxieme element rayonnant The dual-polarized dual-band radiating device according to the invention comprises a first radiating element operating in a first frequency band F1 which is in the form of 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 has at the center of the square dipoles forming the first radiating element, each dipole being fed in its center by a symmetrizer. The first and second radiating element
vent disposes au dessus d'un reflecteur. wind arranged above a reflector.
Suivant une disposition avantageuse, les dipales formant le premier element rayonnant et les symetriseurs vent realises dans une meme plaque metallique, chaque symetriseur d'un dipale etant forme par une ligne a fente en court circuit taillee dans la plaque metallique suivant une direction perpendiculaire a l' axe du dipale. Le deuxieme element rayonnant est s forme par au moins un dipale dispose a l'interieur d'une cavite debouchant au centre de la According to an advantageous arrangement, the dipals forming the first radiating element and the wind symmetrizers produced in the same metal plate, each symmetrizator of a dipalus being formed by a short slit line cut in the metal plate in a direction perpendicular to the axis of the dipalus. The second radiating element is formed by at least one dipale arranged inside a cavity opening in the center of the
plaque metallique.metal plate.
Suivant un autre mode de realisation avantageux de ['invention la plaque metallique et la cavite peuvent etre realises en une seule pidce, par emboutissage par exemple. Le deuxieme element rayonnant fonctionnant dans la bande de frequence F2 est ensuite fixe a l'interieur et au centre de la cavite dont le fond sert de plan de court-circuit electrique a au moins un symetriseur ou balun servant a l'alimentation du deuxieme element rayonnant Ainsi realise le premier element rayonnant et le deuxieme element rayonnant presentent une interaction electromagnetique tres faible. Celle-ci n'est due qu'a la diffraction de bord de la cavite. De la sorte le decouplage entre les deux bandes de frequence est tres fort queue que soit ['orientation relative du ou des dipales formant le deuxieme element rayonnant a According to another advantageous embodiment of the invention, the metal plate and the cavity can be produced in a single 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. radiant Thus realized the first radiating element and the second radiating element present 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 regardless of the relative orientation of the dipal (s) forming the second radiating element at
l'interieur de la cavite, c' est a dire sa polarisation. inside the cavity, ie its polarization.
D'autres caracteristiques et avantages de ['invention apparatront dans la description detaillee Other characteristics and advantages of the invention will appear in the detailed description
ci-apres, faite en reference aux dessins annexes, sur lesquels: - la figure 1 represente un premier mode de realisation d'un premier dispositif rayonnant a double polarisation pouvant fonctionner dans deux bandes de frequence differentes selon ['invention, below, made with reference to the accompanying drawings, in which: FIG. 1 represents a first embodiment of a first radiating device with double polarization capable of operating in two different frequency bands according to the invention,
- la figure 2 represente une vue suivant la coupe AA de la figurrl. - Figure 2 shows a view along section AA of figurrl.
-la figure 3 est une vue en perspective du dispositif represente aux figures 1 et 2. FIG. 3 is a perspective view of the device represented in FIGS. 1 and 2.
-la figure 4 est une variante de realisation du premier element rayonnant de la figure 1 FIG 4 is an alternative embodiment of the first radiating element of Figure 1
-la figure 5 represente un deuxieme mode de realisation d'un dispositif selon ['invention. FIG. 5 represents a second embodiment of a device according to the invention.
-la figure 6 est une vue suivant la coupe AA du dispositif de la figure 5. FIG. 6 is a view along section AA of the device in FIG. 5.
-la figure 7 est une vue en perspective du dispositif des figures 5 et 6. FIG. 7 is a perspective view of the device of FIGS. 5 and 6.
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Les dessins contiennent, pour l'essentiel, des elements de caractere certain. Ils pourront The drawings essentially contain elements of a certain character. They could
done non senlement servir a mieux faire comprendre la description, mais aussi contribuer done not only serve to better understand the description, but also contribute
a la definition de ['invention, le cas echeant. to the definition of the invention, if applicable.
Le dispositif represente aux figures 1, 2 et 3 ou les elements homologues vent representes avec les memes references, fait appara^tre quatre dipoles references de 1 a 4 formant un carre, decoupes dans une plaque metallique 5 comportant un trou central 6 dans lequel debouche l'extremite ouverte d'une cavite rayonnante 7. Le cote du carre forme par chaque dipole a une longueur typique egale a la demi longueur d'onde de l'onde de frequence F1 rayonnee par les dipoles pour une ouver-fure a ml- puissance du faisceau voisine de 65 c dans The device represented in FIGS. 1, 2 and 3 or the homologous elements wind represented with the same references, shows four dipoles referenced from 1 to 4 forming a square, cut out from a metal plate 5 comprising a central hole 6 into which opens out the open end of a radiating cavity 7. The dimension of the square formed by each dipole at a typical length equal to the half wavelength of the wave of frequency F1 radiated by the dipoles for an aperture at ml- beam power close to 65 c in
le plan horizontal.the horizontal plane.
I1 est a noter cependant, que c' est l ' ecartement (d) entre deux dipoles paralleles de la plaque rayonnante 5 et par consequent la longueur des cotes du carre forme par les quatre dip81es 1 a 4 qui determine en grande partie la directivite du diagramme de rayonnement dans le plan horizontal de ces dipoles, c'est a dire l'ouverture a ml- puissance de ce diagramme et que cette ouverture depend assez peu de la longueur (1) des dipoles. La longueur (1) d'un dipole determine son impedance et peut etre plus ou moins grande selon l'epaisseur et la largeur du dipole. Plus cette epaisseur est grande plus course sera la longueur du dipole. En 2 0 d'autres termes le cote (d) du carre est determine en fonction de l'ouverture a ml-puissance qui est recherchee et qui peut avoir une valeur differente de 65c et la longueur des dipoles est ajustee pour assurer ['adaptation d'impedance, en general de 50 Ohms, de la padre des It should be noted, however, that it is the distance (d) between two parallel dipoles of the radiating plate 5 and therefore the length of the sides of the square formed by the four dipoles 1 to 4 which largely determines the direction of the radiation pattern in the horizontal plane of these dipoles, that is to say the aperture at ml-power of this diagram and that this aperture depends little on the length (1) of the dipoles. 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 longer the length of the dipole. In other words, the dimension (d) of the square is determined according to the aperture at ml-power which is sought and which may have a different value of 65c and the length of the dipoles is adjusted to ensure adaptation. impedance, usually 50 Ohms, of the padre des
dip81es paralleles associes pour former une vole de polarisation a diagramme directif.Sui- parallel dip81es associated to form a polarization fly with directional diagram.
vant un mode de realisation avantageux les dipoles 1 a 4 et la cavite 7 peuvent etre realises before an advantageous embodiment the dipoles 1 to 4 and the cavity 7 can be produced
2 5 d'une seule piece par decoupage et emboutissage de la plaque metallique 5. 2 5 in one piece by cutting and stamping the metal plate 5.
Chaque dipole 1 a 4 est alimente par un symetriseur reference respectivement de 8 a 11, de type "balun" forme par une ligne a fente en court circuit taillee dans la plaque metallique 5. Chaque symetriseur constitue un bras support du dipole correspondent. Pour ce faire la plaque 5 est formee autour du trou 6 de passage de la cavite 7 par une couronne concentrique 12 comportant sur sa peripherie exterieure et suivant deux directions a angle droit des excroissances ou bras 13 a 16 de formes par exemple, rectangulaire, biseautee ou trapezodale, reliant respectivement la couronne 12 aux dip81es 1 a 4. La longueur radiale (h) des bras est de preference non nulle, par exemple superieure a 0,0511 de facon a eviter le contact direct du bord interieur des dipoles avec le bord exterieur de la couronne 12 et ainsi minimiser ['interaction entre le courant circulant sur les dipole et les courants circulant sur la couronne 12. La largeur moyenne (w) des bras est typiquement de 5 a 10 fois la largeur de la ligne a fente qui est par ailleurs tres petite devant la longueur d'onde i1 Each dipole 1 to 4 is supplied by a symmetrizer reference respectively from 8 to 11, of the "balun" type formed by a slit line in short circuit cut in the metal plate 5. Each symmetrizor constitutes a support arm of the corresponding dipole. To do this, the plate 5 is formed around the hole 6 for the passage of the cavity 7 by a concentric crown 12 comprising 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 dip81es 1 to 4. The radial length (h) of the arms is preferably non-zero, for example greater than 0.0511 so as to avoid direct contact of the inner edge of the dipoles with the edge outside of the crown 12 and thus minimize the interaction between the current flowing on the dipoles and the currents flowing on the crown 12. The average width (w) of the arms is typically 5 to 10 times the width of the slotted line which is also very small compared to the wavelength i1
correspondent a la frequence F1.correspond to the frequency F1.
La largeur de la couronne 12 est determinee pour etre suffisante a la fois sur le plan mecanique pour supporter les dipoles et sur le plan radioelectrique pour stabiliser la directivite des diagrammes de rayonnement de la cavite 7 dans la deuxieme bande de frequence F2, en rendant moins fluctuante 1'ouverture a ml-puissance des diagrammes de rayonnement en fonction de la frequence. Cette largeur est de preference superieure a S/100 The width of the crown 12 is determined to be sufficient both mechanically to support the dipoles and radio-electrically to stabilize the directivity of the radiation patterns of the cavity 7 in the second frequency band F2, making less fluctuating aperture to ml-power of radiation patterns as a function of frequency. This width is preferably greater than S / 100
ieme de la longueur d'onde i2 correspondent a la frequence F2. th of the wavelength i2 correspond to the frequency F2.
Les dipoles 1 a 4 vent alimentes a leur base, c'est a dire a l'extremite ouverte des lignes a fente des symetriseurs 8 a 11 au moyen par exemple de cables coaxiaux references respectivement de 17 a 20. Sur la vue en coupe de la figure 2 les dipoles 2 et 4 geometrique ment paralleles sur deux cotes opposes du carre vent alimentes a egalite de phase et d'amplitude par deux lignes coaxiales 18 et 20 identiques et un Te d'association 21 pour former une vole de polarisation a diagramme directif, tel un reseau classique de deux dipoles paralleles. Les lignes coaxiales d'alimentation 17, 18, 19, 20 des dipoles vent disposees respectivement le long et sur un cote des symetriseurs 8, 9, 10, 11. La gaine conductrice externe des lignes coaxiales 17 a 20 est en contact electrique avec la base de la premiere 2 5 moitie du dipole qu'elle alimente et avec la plaque S. et le conducteur central est connecte a la base de l'autre moitie du meme dip81e. On obtient ainsi deux voies orthogonales de polarisation dont les diagrammes de rayonnement vent sensiblement identiques. Cependant The dipoles 1 to 4 are supplied at their base, that is to say at the open end of the slotted lines of the symmetrizers 8 to 11 by means, for example, of coaxial cables referenced respectively from 17 to 20. In the sectional view of Figure 2 the dipoles 2 and 4 geometrically parallel on two opposite sides of the square wind supplied with equal phase and amplitude by two identical coaxial lines 18 and 20 and a Te of association 21 to form a polarization fly with diagram directive, like a classic network of two parallel dipoles. The coaxial supply lines 17, 18, 19, 20 of the wind dipoles respectively disposed along and on one side of the symmetrizers 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 2 5 half of the dipole it feeds and with the plate S. 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 substantially identical wind radiation diagrams of which. However
ce mode d' association n' est pas limitatif, et d' autres modes peuvent etre envisages. this mode of association is not limiting, and other modes can be envisaged.
3 0 Les symetriseurs des dipoles vent des lignes a fente taillees dans la plaque S en forme de meandres. Les meandres de chaque ligne a fente doivent etre en nombre suffisant pour que la ligne a fente ait une longueur sensiblement egale au quart de la longueur d'onde de l'onde de frequence F1 rayonnee par le premier element rayonnant. Cependant les lignes a fente peuvent revetir d'autres formes, elles peuvent par exemple comme le montre la figure 4 ou The symmetrizers of the dipoles wind slit lines cut in the plate S in the form of meandres. 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 wave of frequency F1 radiated by the first radiating element. However, the slotted lines can take other forms, they can for example as shown in FIG. 4 or
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les elements homologues a ceux de la figure 1 portent les memes references, etre formees par un troncon circulaire suivi d'un tron,con rectiligne aboutissant a la base d'alimentation d'un dipale. Le troncon circulaire peut etre n'importe ou sur la couronne 12. Cependant pour eviter le couplage entre les ondes de frequences F1 et F2, il est preferable qutil ne soit pas pres du bord du trou 6 mais plutot au milieu de la couronne 12. La cavite metallique 7 peut revetir une forme cylindrique ou legerement conique, de section the elements homologous to those of FIG. 1 bear the same references, to be formed by a circular section followed by a section, straight cone ending at the supply base of a dipale. The circular section can be anywhere on the crown 12. However, to avoid coupling between the waves of frequencies F1 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 metal cavity 7 can have a cylindrical or slightly conical shape, of cross section
circulaire ou plus generalement polygonale a 2 puissance N cotes egaux avec N=2, 3, 4.... circular or more generally polygonal with 2 power N equal dimensions with N = 2, 3, 4 ....
La plaque rayonnante S est en contact electrique avec le bord 7a de la cavite. The radiating plate S is in electrical contact with the edge 7a of the cavity.
La cavite 7 est excitee en son centre par un element rayonnant 23 fonctionnant sur la deuxieme frequence F2. Cet element rayonnant 23 peut etre de type dipole simple pour le cas d'un fonctionnement en mode de polarisation unique ou de type a dipoles croises, ou tourniquet communement appele en anglais "turnstile", pour le cas d'un fonctionnement en mode de polarisations orthogonales, ou tout autre type d'elements rayonnants adapte a d'autres types de polarisation y compris circulaire. Le fond 7b de la cavite 7 est ferme de fa,con a ce que le rayonnement de ['element rayonnant interieur 23 soit unidirectionnel et 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 an operation in single polarization mode or of type with crossed dipoles, or turnstile commonly called in English "turnstile", for the case of an operation in polarization mode orthogonal, or any other type of radiating elements adapted to other types of polarization including circular. The bottom 7b of the cavity 7 is closed so that the radiation from the internal radiating element 23 is unidirectional and
directif vers ['avant de la cavite 7. directive towards the front of the cavity 7.
L'alimentation des dipoles formant ['element rayonnant 23 s'effectue aux moyens de symetriseurs de type "balun". Sur la vue en coupe de la figure 2 chaque symetriseur est forme par un premier tube conducteur 24 et un deuxieme tube conducteur 25 de longueurs sensiblement egales au quart de la longueur d' onde de l' onde de frequence F2. Les conducteurs 24 et 25 vent en liaison electrique par leurs extremites respectives avec la base 2 5 d'alimentation de chaque moitie d'un dipole de 1'element rayonnant 23 et le fond 7b de la cavite. Le premier tube 24 est traverse le long de son axe longitudinal par un conducteur central 26 dont une extremite est reliee a la base d'alimentation du demi dipole oppose a celui auquel il est relic par une de ses extremites et dont l'autre extremite peut etre reliee au conducteur central d'un connecteur d'alimentation ou eventuellement au conducteur central d'un cable coaxial non representes. Les tubes 24 et 25 forment ainsi avec le conducteur central 26 une ligne coaxiale transforrnatrice d'impedance pour le dipole anquel ils vent relies. De fa,con avantageuse la profondeur de la cavite 7 est proche du quart de la longueur d'onde The dipoles forming the radiating element 23 are supplied by means of balun type symmetrizers. In the sectional view of FIG. 2, 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 wind in electrical connection at their respective ends with the supply base 25 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. In a way, advantageously the depth of the cavity 7 is close to a quarter of the wavelength
12 de l'onde rayonnee de frequence F2 de ['element rayonnant 23 interieur a la cavite. 12 of the radiated wave of frequency F2 of the radiating element 23 inside the cavity.
La hauteur de ['element rayonnant 23 par rapport au fond 7b de la cavite est egalement proche du quart de la longueur d'onde 12 tout en etant inferieure a laprofondeur de la cavite 7. Le diametre de la cavite 7 peut varier dans de larges proportions, entre par exemple 0,4572 et l2, pour des ouvertures a demi-puissance inferieures a 90 des diagrammes de rayonnement dans les plans diagonaux inclines de 45 par rapport aux plans principaux E et H du dipole a l'interieur de la cavite. Toutefois selon le rapport des frequences F1 /F2 l'ecartement necessaire entre les dipoles 1 a 4 de la plaque rayonnante 5 fonctionnant a la frequence F1 peut limiter le diametre maximum de la cavite 7. Par exemple, avec un ecartement de 1 70mm entre deux dipoles paralleles de la plaque rayonnante fonctionnant dans la bande GSM900, un diametre de 80mm et une profondeur de cavite de 40mm conviennent pour realiser un diagramme d'ouverture a ml-puissance 65 environ dans la The height of the radiating element 23 relative to the bottom 7b of the cavity is also close to a quarter of the wavelength 12 while being less than the depth of the cavity 7. The diameter of the cavity 7 can vary within wide proportions, for example between 0.4572 and 12, for half-power openings less than 90 of the radiation patterns in the diagonal planes inclined by 45 with respect to the main planes E and H of the dipole inside the cavity. However, according to the ratio of frequencies F1 / F2, the necessary spacing between the dipoles 1 to 4 of the radiating plate 5 operating at the frequency F1 can limit the maximum diameter of the cavity 7. For example, with a spacing of 1 70mm between two Parallel dipoles of the radiating plate operating in the GSM900 band, a diameter of 80mm and a depth of cavity of 40mm are suitable for producing an opening diagram at ml-power about 65 in the
bande GSM1800 ou UMTS.GSM1800 or UMTS band.
Comme il apparait sur les figures 2 et 3 la cavite 7 qui supporte la plaque 5 est fixee sur un reflecteur 34 de dimensions suffisantes pour permettre aux champs electromagnetiques 2 0 rayonnes a l'arriere des dipoles sur le reflecteur d'etre renvoyes sur ['avant. Outre son role mecanique, le reflecteur 34 est destine a rendre unidirectionnel le rayonnement des dipales de la structure rayonnante. Le reflecteur 34 peut comporter des murets dont le role est de rigidifier la structure mais egalement d'agir sur la directivite des diagrammes rayonnes. La hauteur des dipoles de la plaque rayonnante 5 par rapport au reflecteur 34 peut varier As it appears in FIGS. 2 and 3 the cavity 7 which supports the plate 5 is fixed on a reflector 34 of sufficient dimensions to allow the electromagnetic fields 2 0 radiated behind the dipoles on the reflector to be returned to [' before. In addition to its mechanical role, the reflector 34 is intended to render the radiation of the dipals of the radiating structure unidirectional. The reflector 34 may include low walls whose role is to stiffen the structure but also to act on the directionality of the radiated diagrams. The height of the dipoles of the radiating plate 5 relative to the reflector 34 can vary
2 5 typiquement de 71/8 a 11/4 dans la bande de frequence F1 de longueur d'onde 11. 2 5 typically from 71/8 to 11/4 in the frequency band F1 of wavelength 11.
Suivant un autre mode de realisation illustre aux figures 5 a 7 ou les elements homologues a ceux des figures 1 a 4 portent les memes references, les dipoles 1 a 4 de la plaque 5 vent en partie sureleves par rapport au plan forme par l'ouverture de la cavite 7, chaque dipole etant partage en trots parties, une partie basse respectivement lb, 2b, 3b, 4b situee dans le plan de la plaque 5 etdeux parties hautesrespectivement la, lc; 2a, 2c; 3a,3c; 4a, 4c situees de part et d'autre de la partie basset Cette surelevation qui de preference doit conserver la symetrie geometrique de la structure, peut egalement se faire en inclinant les parties des dipoles situes au-dela des zones des symetriseurs 8 a 1 lcorrespondants. Diverses autres formes geometriques peuvent etre envisagees pour realiser des dipoles, la seule condition etant le respect de la symetrie de la structure rayonnante, c'est a dire l'identite des dipoles, si non des quatre au moins deux a deux par padres de dipoles paralleles. La symetrie des dipoles par padre signifie que deux dipoles paralleles ont une meme longueur totale de fa,con a ce qu'ils aient la meme impedance et que leur rayonnement respectif soit sensiblement le meme. Les deux padres de dipoles ne vent pas obligatoirement identiques car chaque padre de dipoles engendre une vole de polarisation independante. La symetrie dont il s'agit est une According to another embodiment illustrated in Figures 5 to 7 where the elements homologous to those of Figures 1 to 4 bear the same references, 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 1b, 2b, 3b, 4b respectively situated in the plane of the plate 5 and two upper parts respectively la, lc; 2a, 2c; 3a, 3c; 4a, 4c located on either side of the basset part This elevation which preferably must maintain the geometric symmetry of the structure, can also be done by tilting the parts of the dipoles located beyond the zones of the symmetrizers 8 to 1 corresponding . Various other geometrical forms can be envisaged to realize dipoles, the only condition being the respect of the symmetry of the radiating structure, ie the identity of the dipoles, if not of the four at least two by two per padres of dipoles parallel. The symmetry of the dipoles per padre 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 padres of dipoles do not necessarily wind identical because each padre of dipoles generates a flight of independent polarization. The symmetry in question is a
symetrie par rapport au centre (O) du carre forme par les quatre dipoles. symmetry with respect to the center (O) of the square formed by the four dipoles.
Les structures des elements rayonnants des figures 1 a 7 vent tres simples et permettent de realiser a moindre cout des structures rayonnantes bi-bande ayant deux voies orthogonales de polarisation dans chaque bande de frequence, inclinees par exemple, comme le montrent les figures 1 et 5, de t 45O par rapport a une direction verticale w'. Les quatre voies ainsi formees vent fortement decouplees entre elles de typiquement 30dB, et rayonnent dans chaque bande de frequence suivant des diagrammes de directivite unidirectionnels ayant des The structures of the radiating elements of FIGS. 1 to 7 are very simple and make it possible to produce, at lower cost, dual-band radiating structures having two orthogonal polarization paths in each frequency band, inclined for example, as shown in FIGS. 1 and 5 , of t 45O with respect to 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 directional patterns having
ouvertures a ml-puissance inferieures a 90 dans le plan horizontal, par exemple 65 . apertures at ml-power less than 90 in the horizontal plane, for example 65.
Avantageusement il pourra etre realise des alignements colineaires d'une pluralite de telles structures rayonnantes pour former des reseaux lineaires verticaux de gain eleve, par exemple 18dBi, bi-bande ayant deux voies de polarisation orthogonales inclinees de +45 Advantageously, linear 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
par rapport a une direction verticale w' dans chaque bande de frequence. with respect to a vertical direction w 'in each frequency band.
On peut realiser un reseau qui comprend d'une part des elements rayonnants bi-bande et bipolarises du type decrit a la fgure 7 fonctionnant dans les bandes F1 (GSM900) et F2(UMTS et/ou DCS) et d'autre part d' elements rayonnants mono bande bipolarises fonctionnant dans la bande F2 du meme type que les elements centraux de la figure 7. Le pas du reseau pour la bande F2 est moitie du pas du reseau pour la bande F 1. On peut ainsi construire un reseau hautement directif et a pas regulier, bi- bande et bipolarise ayant une b onne purete de polari sation et un fort decoupl age entre l es differentes voi es. On notera que tous les elements rayonnants fonctionnant dans la bande F2 ont sensiblement le meme centre de phase du fait de leur identite, celui-ci etane situe sur l'axe central de la cavite, axe perpendiculaire au plan de l'ouverture de la cavite. Cette propriete facilite grandement le pointage electrique (ou Tilt) du faisceau par action sur les dephasages entre elements rayonnants et permet egalement un meilleur alignement des phases des elements rayonnants A network can be produced which comprises, on the one hand, dual-band and bipolarized radiating elements of the type described in FIG. 7 operating in the bands F1 (GSM900) and F2 (UMTS and / or DCS) and, on the other hand, Bipolarized mono-band radiating elements operating in the F2 band of the same type as the central elements in Figure 7. The network pitch for the F2 band is half the network pitch for the F-band 1. We can thus build a highly directive network and with regular, dual-band and bipolarized pitch having a good polarization purity and a strong decoupling between the different channels. It will be noted that all the radiating elements operating in the band F2 have substantially the same phase center because of their identity, this etane 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.
dans la bande de frequence pour une plus grande directivite de l'antenne. in the frequency band for greater directivity of the antenna.
Des elements rayonnants realises conformement a ceux de ['invention decrits precedem- Radiant elements produced in accordance with those of the invention described above
ment et fonctionnant dans les bandes de frequence GSM1800, GSM 1900 et UMTS ont permi d'obtenir une isolation entre les voies proche de 30dB, avec des rapports d'onde stationnaire par rapport a 50 Ohms pour tous les elements rayonnants inferieurs a 1,7:1 et des ouvertures a ml-puissance des diagrammes de directivite proches de 65 dans le plan and operating in the frequency bands GSM1800, GSM 1900 and UMTS have made it possible to obtain an insulation between the channels close to 30dB, with standing wave ratios compared to 50 Ohms for all the radiating elements lower than 1.7 : 1 and apertures at ml-power of the directivity diagrams close to 65 in the plane
horizontal pour des gains voisins de 9dBi dans les deux bandes de frequence. horizontal for gains close to 9dBi in the two frequency bands.
Claims (4)
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
DE60331067T DE60331067D1 (en) | 2002-06-25 | 2003-06-11 | DOUBLE POLARIZATION DOUBLE BAND RADIATION DEVICE |
EP03760720A EP1516393B1 (en) | 2002-06-25 | 2003-06-11 | Double polarization dual-band radiating device |
ES03760720T ES2339764T3 (en) | 2002-06-25 | 2003-06-11 | DOUBLE POLARIZATION BI-BAND RADIANT DEVICE. |
CN03814895.1A CN100570953C (en) | 2002-06-25 | 2003-06-11 | Double polarization dual-band radiating device |
PCT/FR2003/001745 WO2004001902A1 (en) | 2002-06-25 | 2003-06-11 | Double polarization dual-band radiating device |
AT03760720T ATE456168T1 (en) | 2002-06-25 | 2003-06-11 | DUAL POLARIZATION DUAL BAND RADIATION DEVICE |
PT03760720T PT1516393E (en) | 2002-06-25 | 2003-06-11 | Double polarization dual-band radiating device |
AU2003255660A AU2003255660A1 (en) | 2002-06-25 | 2003-06-11 | Double polarization dual-band radiating device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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FR0207872A FR2841390B1 (en) | 2002-06-25 | 2002-06-25 | DUAL POLARIZATION TWO-BAND RADIATION DEVICE |
Publications (2)
Publication Number | Publication Date |
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FR2841390A1 true FR2841390A1 (en) | 2003-12-26 |
FR2841390B1 FR2841390B1 (en) | 2004-09-24 |
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FR0207872A Expired - Fee Related FR2841390B1 (en) | 2002-06-25 | 2002-06-25 | DUAL POLARIZATION TWO-BAND RADIATION DEVICE |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3306742A1 (en) * | 2016-10-05 | 2018-04-11 | Kathrein Werke KG | Mobile radio antenna |
EP3968465A1 (en) * | 2020-09-11 | 2022-03-16 | ArianeGroup SAS | Antenna with improved coverage on a larger frequency domain |
WO2023110068A1 (en) * | 2021-12-15 | 2023-06-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Radiator as well as antenna |
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US3740754A (en) * | 1972-05-24 | 1973-06-19 | Gte Sylvania Inc | Broadband cup-dipole and cup-turnstile antennas |
US3789416A (en) * | 1972-04-20 | 1974-01-29 | Itt | Shortened turnstile antenna |
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 |
US20010048400A1 (en) * | 2000-05-02 | 2001-12-06 | Larochelle Donald G. | Low profile, broadband, dual mode, modified notch antenna |
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2002
- 2002-06-25 FR FR0207872A patent/FR2841390B1/en not_active Expired - Fee Related
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Publication number | Priority date | Publication date | Assignee | Title |
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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 |
US20010048400A1 (en) * | 2000-05-02 | 2001-12-06 | Larochelle Donald G. | Low profile, broadband, dual mode, modified notch antenna |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3306742A1 (en) * | 2016-10-05 | 2018-04-11 | Kathrein Werke KG | Mobile radio antenna |
US11362437B2 (en) | 2016-10-05 | 2022-06-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Antenna for mobile communication |
EP3968465A1 (en) * | 2020-09-11 | 2022-03-16 | ArianeGroup SAS | Antenna with improved coverage on a larger frequency domain |
FR3114195A1 (en) * | 2020-09-11 | 2022-03-18 | Arianegroup Sas | Antenna with improved coverage over a wide frequency domain |
US11658421B2 (en) | 2020-09-11 | 2023-05-23 | Arianegroup Sas | Antenna with improved coverage over a wider frequency band |
WO2023110068A1 (en) * | 2021-12-15 | 2023-06-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Radiator as well as antenna |
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FR2841390B1 (en) | 2004-09-24 |
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