EP0429338A1 - Circularly polarised antenna particularly for antenna arrays - Google Patents
Circularly polarised antenna particularly for antenna arrays Download PDFInfo
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- EP0429338A1 EP0429338A1 EP90403208A EP90403208A EP0429338A1 EP 0429338 A1 EP0429338 A1 EP 0429338A1 EP 90403208 A EP90403208 A EP 90403208A EP 90403208 A EP90403208 A EP 90403208A EP 0429338 A1 EP0429338 A1 EP 0429338A1
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- 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
Definitions
- the present invention relates to a circularly polarized antenna, in particular an elementary antenna for an antenna array.
- circular polarization in particular in radar applications, where it is known that circular polarization makes it possible to eliminate the echoes produced by obstacles with isotropic reflection, quite particularly the echoes of rain (caused by water droplets suspended in the clouds).
- the wave emitted according to a given circular polarization for example a right circular polarization
- a reverse polarization circular to the left in this example.
- it will then be easy, at the level of the receiver, to suppress this reflection by means of a cross polarization eliminator.
- One of the aims of the invention is to propose such an antenna with circular polarization, in particular to serve as a primary source (elementary antenna) in a network antenna, and which can be supplied directly by a line called "triplate”.
- a three-ply line is formed by a flat central conductor forming a coaxial core, sandwiched between two thicknesses of dielectric (possibly air) themselves covered on their outer surfaces by conductors located in line with the central conductor and supplied in parallel , therefore equipotential, forming peripheral earth conductors.
- the known primary sources with circular polarization do not operate in the same mode as the triplate line and therefore require, in addition to the mechanical and electrical interfacing of the source to the line triplate, a change in excitation mode detrimental to optimal operation of the source.
- the radiating elements produced up to now in triplate technology did not provide circular polarization, and it was therefore necessary, in order to obtain such a polarization mode, to add to them polarizers such as polarizers with dielectric plates, with screws , with wires, etc., with all the corresponding losses of adaptation and difficulties of realization.
- the object of the present invention is to propose a new form of primary source with circular polarization which can directly extend the three-plate feed line, generally constituted by one of the ramifications of a network antenna distributor.
- the invention consists in extending the supply line by two orthogonal triplate dipoles and a phase shifter inserted between the two dipoles, so as to create a monobloc primary source radiating a circularly polarized wave (we indeed know that, to produce a circularly polarized wave, two neighboring orthogonal dipoles should be excited by signals of the same amplitude but in quadrature).
- the antenna of the invention which is excited by a triplate supply line comprising two peripheral conductors disposed respectively above and above below a central conductor, comprises, at the end of this triplate supply line: - A first dipolar radiating element, comprising two quarter wave branches formed by extending in their plane, in transverse direction and in the same direction, each of the peripheral conductors, and a quarter wave branch formed by extending in its plane, parallel to the two aforementioned branches but in the opposite direction, the central conductor, - A second dipolar radiating element, orthogonal to the first, comprising two quarter-wave branches formed by folding, in opposite directions, the central conductor and one of the peripheral conductors, these two branches being coplanar and coaxial and extending perpendicular to the planes of the conductors, and - distributor and phase shifter means, to excite the dipole radiating elements by respective similar signals, of the same amplitude but 90 ° out of phase.
- the distributing and phase-shifting means are constituted by a quarter wave axial segment of triplate line, this triplate line segment extending the triplate supply line beyond the first dipolar radiating element, the branches of the second dipolar radiating element being formed at the end of this triplate line segment, and the dimensions of this triplate line segment and the specific characteristics of its dielectric being chosen so as to excite the dipole radiating elements by respective respective signals, of the same amplitude but phase shifted 90 °.
- the antenna further comprises a plane polarization filter, for example a network of wires, interposed between the dipolar radiating elements and extending parallel to them.
- the network of wires can in particular be arranged against the inner face of a radome), the parts of the antenna situated in front of this network of wires being embedded in the wall of this radome.
- the reference 1 designates the three-plate supply line, consisting of a central conductor 2 sandwiched between two peripheral conductors 3.3 ′, forming half ground planes; these three conductors are produced in the form of rigid plates or strips arranged parallel to each other and separated by an appropriate dielectric (which may be air, spacings then being simply provided to precisely maintain the various elements of the line in their place).
- an appropriate dielectric which may be air, spacings then being simply provided to precisely maintain the various elements of the line in their place).
- the triplate line may in particular constitute the end of one of the ramifications of a network antenna distributor (not shown), this end crossing a ground plane 4 with the interposition of an isolator 5 further ensuring the mechanical maintenance and positioning of the supply line.
- This supply line firstly excites a first horizontal dipole 10, intended to produce the horizontal component of the circular polarization of the wave.
- the antenna of the invention is described here essentially in the form of a source emitting a circularly polarized wave, this same antenna can also be used, due to the principle of reciprocity , in as a receiving antenna, without any modification.
- the horizontal dipole 10 is produced by extending transversely (that is to say perpendicular to the general direction, materialized by the axis ⁇ , of the triplate line) the peripheral conductors 3, 3 ′ of the supply line by respective branches 11, 11 ′), on a first side (the same for the two branches 11 and 11 ′) of the axis ⁇ .
- the other part of the dipole is constituted by a branch 12 formed by extending transversely, but on the other side of the axis ⁇ , the central conductor of the supply line. It is possible to provide, between the branches 11 and 11 ′, a low-loss dielectric 13 making it possible in particular to ensure the mechanical rigidity of the assembly.
- the branches 11, 11 ′ and 12 are of the same length, equal to about a quarter wave (the wavelength being, of course, considered in the dielectric).
- the metallic ground plane 4 plays the role of short-circuit plane for the horizontal dipole 10.
- triplate line is then extended axially over a length of approximately a quarter wave (the role played by this section will be explained below) then, at the end of this extended line, a second, vertical dipole 20 is formed intended for produce the vertical component of the circularly polarized wave.
- This dipole 20 is formed by folding the central conductor 2 downwards, which gives the branch 21, and one of the peripheral conductors (here, the upper conductor 3) upwards, which gives the second branch 22 of the dipole 20
- These two branches 21 and 22 also have a length of around a quarter wave.
- the part of the line separating the two dipoles, referenced 30, will serve as a phase shifter making it possible to feed the respective two dipoles in quadrature.
- this dielectric 33, 33 ′ a material with low losses will be chosen, in order to have the best possible power handling for the source thus formed.
- the relative dimensions of the different parts of the line are chosen so as to obtain, in a manner known per se, a halving of the radioelectric energy at the point of the excitation point of the horizontal dipole .
- We will thus have two orthogonal components of the same amplitude to achieve the desired circular polarization.
- the antenna comprises, at a quarter wave behind the vertical dipole 20, a network of wires 40 which performs two essential functions: first of all, it constitutes the short-circuit plane of the vertical dipole 20, since the wires of the network 40 are parallel to the orientation of this dipole, and - It acts as a cross polarization filter (in particular for reception) for the horizontal dipole 10, so that the wave emitted or received by the latter is as linearly polarized as possible in the horizontal direction.
- the array of wires 40 can be mounted on the rear face of a radome 41, for example a radome formed from a light foam in which the vertical dipoles 20 of the antenna array will be embedded.
- a radome 41 for example a radome formed from a light foam in which the vertical dipoles 20 of the antenna array will be embedded.
- the radome and the frame are kept at a precise distance from the ground plane 4 by means of spacers 42.
Abstract
Description
La présente invention concerne une antenne à polarisation circulaire, notamment une antenne élémentaire pour réseau d'antennes.The present invention relates to a circularly polarized antenna, in particular an elementary antenna for an antenna array.
Dans nombre de circonstances, il est souhaitable de disposer d'une polarisation circulaire, notamment dans les applications radar, où l'on sait que la polarisation circulaire permet d'éliminer les échos produits par les obstacles à réflexion isotrope, tout particulièrement les échos de pluie (provoqués par les gouttelettes d'eau en suspension dans les nuages).In a number of circumstances, it is desirable to have circular polarization, in particular in radar applications, where it is known that circular polarization makes it possible to eliminate the echoes produced by obstacles with isotropic reflection, quite particularly the echoes of rain (caused by water droplets suspended in the clouds).
En effet, l'onde émise selon une polarisation circulaire donnée, par exemple une polarisation circulaire droite, va être déphasée de 180° par réflexion sur l'obstacle et va donc être renvoyée avec une polarisation inverse, circulaire à gauche dans cet exemple. il sera alors aisé, au niveau du récepteur, de supprimer cette réflexion au moyen d'un éliminateur de polarisation croisée.Indeed, the wave emitted according to a given circular polarization, for example a right circular polarization, will be phase shifted by 180 ° by reflection on the obstacle and will therefore be returned with a reverse polarization, circular to the left in this example. it will then be easy, at the level of the receiver, to suppress this reflection by means of a cross polarization eliminator.
L'un des buts de l'invention est de proposer une telle antenne à polarisation circulaire, notamment pour servir de source primaire (antenne élémentaire) dans une antenne réseau, et qui puisse être alimentée directement par une ligne dite «triplaque».One of the aims of the invention is to propose such an antenna with circular polarization, in particular to serve as a primary source (elementary antenna) in a network antenna, and which can be supplied directly by a line called "triplate".
Une ligne triplaque est constituée par un conducteur central plat formant âme de coaxial, pris en sandwich entre deux épaisseurs de diélectrique (éventuellement l'air) elles-mêmes recouvertes à leurs surfaces extérieures par des conducteurs situés au droit du conducteur central et alimentés en parallèle, donc équipotentiels, formant conducteurs périphériques de masse.A three-ply line is formed by a flat central conductor forming a coaxial core, sandwiched between two thicknesses of dielectric (possibly air) themselves covered on their outer surfaces by conductors located in line with the central conductor and supplied in parallel , therefore equipotential, forming peripheral earth conductors.
Cette technologie triplaque est très courante en particulier dans les antennes réseau, car elle permet de réaliser aisément les distributeurs complexes nécessaires à l'alimentation des différentes sources primaires du réseau.This triplate technology is very common, in particular in network antennas, because it allows the complex distributors necessary to supply the various primary sources of the network to be easily produced.
En revanche, l'un des inconvénients de la technologie triplaque tenait au fait que, jusqu'à présent, il n'existait aucune source primaire à polarisation circulaire prolongeant directement la ligne triplaque d'alimentation.On the other hand, one of the drawbacks of the triple plate technology was that, until now, there had been no primary source with circular polarization directly extending the feed line.
En effet, les sources primaires à polarisation circulaire connues (antennes hélicoïdales, antennes «bougie», etc.) ne fonctionnent pas dans le même mode que la ligne triplaque et nécessitent donc, outre l'interfaçage mécanique et électrique de la source à la ligne triplaque, un changement de mode d'excitation préjudiciable à un fonctionnement optimal de la source.In fact, the known primary sources with circular polarization (helical antennas, “candle” antennas, etc.) do not operate in the same mode as the triplate line and therefore require, in addition to the mechanical and electrical interfacing of the source to the line triplate, a change in excitation mode detrimental to optimal operation of the source.
Par ailleurs, les éléments rayonnants réalisés jusqu'à présent en technologie triplaque ne procuraient pas de polarisation circulaire, et il était donc nécessaire, pour obtenir un tel mode de polarisation, de leur adjoindre des polariseurs tels que des polariseurs à lames diélectriques, à vis, à fils, etc., avec toutes les pertes d'adaptation et difficultés de réalisation corrélatives.Furthermore, the radiating elements produced up to now in triplate technology did not provide circular polarization, and it was therefore necessary, in order to obtain such a polarization mode, to add to them polarizers such as polarizers with dielectric plates, with screws , with wires, etc., with all the corresponding losses of adaptation and difficulties of realization.
La présente invention a pour objet de proposer une nouvelle forme de source primaire à polarisation circulaire qui puisse directement prolonger la ligne triplaque d'alimentation, généralement constituée par l'une des ramifications d'un distributeur d'antenne réseau.The object of the present invention is to propose a new form of primary source with circular polarization which can directly extend the three-plate feed line, generally constituted by one of the ramifications of a network antenna distributor.
Avec une telle source, on pourra, pour produire le rayonnement, utiliser le mode TM ou quasi-TM caractéristique des lignes triplaques, qui procure une excellente largeur de bande.With such a source, it is possible, to produce the radiation, to use the TM or quasi-TM mode characteristic of triplate lines, which provides excellent bandwidth.
On verra en outre que la structure, très simple, de la source selon l'invention conduit à une industrialisation à faible coût, particulièrement avantageuse pour la réalisation de réseaux comportant un grand nombre de sources primaires.It will also be seen that the very simple structure of the source according to the invention leads to industrialization at low cost, which is particularly advantageous for the production of networks comprising a large number of primary sources.
Essentiellement, l'invention consiste à prolonger la ligne d'alimentation par deux dipôles triplaques orthogonaux et un déphaseur inséré entre les deux dipôles, de manière à créer une source primaire monobloc rayonnant une onde polarisée circulairement (on sait en effet que, pour produire une onde polarisée circulairement, il convient d'exciter deux dipôles orthogonaux voisins par des signaux de même amplitude mais en quadrature).Essentially, the invention consists in extending the supply line by two orthogonal triplate dipoles and a phase shifter inserted between the two dipoles, so as to create a monobloc primary source radiating a circularly polarized wave (we indeed know that, to produce a circularly polarized wave, two neighboring orthogonal dipoles should be excited by signals of the same amplitude but in quadrature).
Plus précisément, l'antenne de l'invention, qui est excitée par une ligne triplaque d'alimentation comprenant deux conducteurs périphériques disposés respectivement au-dessus et au- dessous d'un conducteur central, comporte, à l'extrémité de cette ligne triplaque d'alimentation :
- un premier élément rayonnant dipolaire, comprenant deux branches quart d'onde formées en prolongeant dans leur plan, en direction transversale et dans un même sens, chacun des conducteurs périphériques, et une branche quart d'onde formée en prolongeant dans son plan, parallèlement aux deux branches précitées mais en sens opposé, le conducteur central,
- un second élément rayonnant dipolaire, orthogonal au premier, comprenant deux branches quart d'onde formées par repliement, dans des sens opposés, du conducteur central et de l'un des conducteurs périphériques, ces deux branches étant coplanaires et coaxiales et s'étendant perpendiculairement aux plans des conducteurs,et
- des moyens répartiteurs et déphaseurs, pour exciter les éléments rayonnants dipolaires par des signaux respectifs semblables, de même amplitude mais déphasés de 90°.More specifically, the antenna of the invention, which is excited by a triplate supply line comprising two peripheral conductors disposed respectively above and above below a central conductor, comprises, at the end of this triplate supply line:
- A first dipolar radiating element, comprising two quarter wave branches formed by extending in their plane, in transverse direction and in the same direction, each of the peripheral conductors, and a quarter wave branch formed by extending in its plane, parallel to the two aforementioned branches but in the opposite direction, the central conductor,
- A second dipolar radiating element, orthogonal to the first, comprising two quarter-wave branches formed by folding, in opposite directions, the central conductor and one of the peripheral conductors, these two branches being coplanar and coaxial and extending perpendicular to the planes of the conductors, and
- distributor and phase shifter means, to excite the dipole radiating elements by respective similar signals, of the same amplitude but 90 ° out of phase.
Très avantageusement, les moyens répartiteurs et déphaseurs sont constitués par un segment quart d'onde axial de ligne triplaque, ce segment de ligne triplaque prolongeant la ligne triplaque d'alimentation au-delà du premier élément rayonnant dipolaire, les branches du second élément rayonnant dipolaire étant formées à l'extrémité de ce segment de ligne triplaque, et les dimensions de ce segment de ligne triplaque et les caractéristiques propres de son diélectrique étant choisies de manière à exciter les éléments rayonnants dipolaires par des signaux respectifs semblables, de même amplitude mais déphasés de 90°.Very advantageously, the distributing and phase-shifting means are constituted by a quarter wave axial segment of triplate line, this triplate line segment extending the triplate supply line beyond the first dipolar radiating element, the branches of the second dipolar radiating element being formed at the end of this triplate line segment, and the dimensions of this triplate line segment and the specific characteristics of its dielectric being chosen so as to excite the dipole radiating elements by respective respective signals, of the same amplitude but phase shifted 90 °.
De préférence, l'antenne comprend en outre un filtre de polarisation plan, par exemple un réseau de fils, intercalé entre les éléments rayonnants dipolaires et s'étendant parallèlement à ceux-ci. Le réseau de fils peut notamment être disposé contre la face intérieure d'un radôme), les parties de l'antenne situées en avant de ce réseau de fils étant noyées dans la paroi de ce radôme.Preferably, the antenna further comprises a plane polarization filter, for example a network of wires, interposed between the dipolar radiating elements and extending parallel to them. The network of wires can in particular be arranged against the inner face of a radome), the parts of the antenna situated in front of this network of wires being embedded in the wall of this radome.
On va maintenant donner un exemple de réalisation de l'invention, en référence à la figure unique annexée représentant une vue en perspective de l'antenne selon l'invention, disposée dans un radôme représenté sous forme partiellement arrachée.We will now give an exemplary embodiment of the invention, with reference to the single appended figure showing a perspective view of the antenna according to the invention, arranged in a radome shown in partially cut away form.
Sur la figure, la référence 1 désigne la ligne triplaque d'alimentation, constituée d'un conducteur central 2 disposé en sandwich entre deux conducteurs périphériques 3,3′, formant demi-plans de masse ; ces trois conducteurs sont réalisés sous forme de plaques ou bandes rigides disposées parallèlement entre elles et séparées par un diélectrique approprié (qui peut être l'air, des entreteises étant alors simplement prévues pour maintenir précisément à leur place les différents éléments de la ligne).In the figure, the
La ligne triplaque peut notamment constituer l'extrémité de l'une des ramifications d'un répartiteur d'antenne réseau (non représenté) cette extrémité traversant un plan de masse 4 avec interposition d'un isolateur 5 assurant en outre le maintien mécanique et le positionnement de la ligne d'alimentation.The triplate line may in particular constitute the end of one of the ramifications of a network antenna distributor (not shown), this end crossing a ground plane 4 with the interposition of an
Cette ligne d'alimentation excite tout d'abord un premier dipôle horizontal 10, destiné à produire la composante horizontale de la polarisation circulaire de l'onde.This supply line firstly excites a first
On notera incidemment que les termes tels que «horizontal» ou «vertical» ne sont bien entendus pas limitatifs et ne se réfèrent qu'au mode de réalisation illustré, qui correspond à la configration la plus courante dans les antennes réseaux, où les distributeurs triplaques sont généralement horizontaux. Cette orientation n'est cependant aucunement restrictive et toute autre orientation absolue dans l'espace pourrait être choisie dès lors que la condition, évoqué plus loin, d'orthogonalité entre les deux dipôles est respectée.Incidentally, it will be noted that terms such as “horizontal” or “vertical” are clearly understood to be non-limiting and refer only to the illustrated embodiment, which corresponds to the most common configration in the network antennas, where the triplate distributors are generally horizontal. This orientation is however in no way restrictive and any other absolute orientation in space could be chosen as soon as the condition, mentioned below, of orthogonality between the two dipoles is respected.
Dans le même ordre d'idées, bien que l'on décrive ici l'antenne de l'invention essentiellement sous forme d'une source émettant une onde polarisée circulairement, cette même antenne peut aussi bien être utilisée, du fait du principe de réciprocité, en tant qu'antenne de réception, sans aucune modification.In the same vein, although the antenna of the invention is described here essentially in the form of a source emitting a circularly polarized wave, this same antenna can also be used, due to the principle of reciprocity , in as a receiving antenna, without any modification.
Le dipôle horizontal 10 est réalisé en prolongeant transversalement (c'est-à-dire perpendiculairement à la direction générale, matérialisée par l'axe Δ, de la ligne triplaque) les conducteurs périphériques 3, 3′ de la ligne d'alimentation par des branches respectives 11, 11′), d'un premier côté (le même pour les deux branches 11 et 11′) de l'axe Δ. L'autre partie du dipôle est constitué par une branche 12 formée en prolongeant transversalement, mais de l'autre côté de l'axe Δ, le conducteur central de la ligne d'alimentation. On peut prévoir, entre les branches 11 et 11′, un diélectrique 13 à faible pertes permettant notamment d'assurer la rigidité mécanique de l'ensemble.The
Les branches 11, 11′ et 12 sont de même longueur, égale à environ un quart d'onde (la longueur d'onde étant, bien entendu, considérée dans le diélectrique).The branches 11, 11 ′ and 12 are of the same length, equal to about a quarter wave (the wavelength being, of course, considered in the dielectric).
On notera que le plan métallique de masse 4 joue le rôle de plan de court-circuit pour le dipôle horizontal 10.It will be noted that the metallic ground plane 4 plays the role of short-circuit plane for the
On prolonge ensuite la ligne triplaque axialement sur une longueur d'environ un quart d'onde (on expliquera plus bas le rôle joué par ce tronçon) puis, en bout de cette ligne prolongée, on forme un second dipôle, vertical, 20 destiné à produire la composante verticale de l'onde polarisée circulairement.The triplate line is then extended axially over a length of approximately a quarter wave (the role played by this section will be explained below) then, at the end of this extended line, a second,
Ce dipôle 20 est formé par repliement du conducteur central 2 vers le bas, qui donne la branche 21, et de l'un des conducteurs périphériques (ici, le conducteur supérieur 3) vers le haut, qui donne la seconde branche 22 du dipôle 20. Ces deux branches 21 et 22 ont également une longueur d'environ un quart d'onde.This
La partie de ligne séparant les deux dipôles, référencée 30, va servir de déphaseur permettant d'alimenter en quadrature les deux dipôles respectifs.The part of the line separating the two dipoles, referenced 30, will serve as a phase shifter making it possible to feed the respective two dipoles in quadrature.
A cet effet, on dispose entre la partie centrale 31 et les parties périphériques 32, 32′ de ce tronçon de ligne triplaque, respectivement en 33 et 33′, un diélectrique dont les caractéristiques sont telles que l'on obtienne (compte tenu également de la longueur du tronçon 30) le déphasage voulu de 90°.For this purpose, there is between the
On choisira de préférence pour ce diélectrique 33, 33′ un matériau à faible pertes, afin d'avoir la meilleure tenue en puissance possible pour la source ainsi constituée.Preferably, for this dielectric 33, 33 ′, a material with low losses will be chosen, in order to have the best possible power handling for the source thus formed.
En effet, la tenue en puissance de cette source n'est essentiellement limitée que par les pertes éventuelles dans les diélectriques puisque, par construction, on élimine virtuellement les pertes d'adaptation, l'ensemble de l'élément étant exclusivement réalisé en technologie triplaque.Indeed, the power handling of this source is essentially limited only by the possible losses in the dielectrics since, by construction, the adaptation losses are virtually eliminated, the whole of the element being exclusively produced in triplate technology. .
Par ailleurs, les dimensions relatives des différentes parties de la ligne sont choisies de manière à obtenir, de manière en elle-même connue, une division par deux de l'énergie radio-électrique à l'endroit du point d'excitation du dipôle horizontal. On va ainsi disposer de deux composantes orthogonales de même amplitude permettant de réaliser la polarisation circulaire voulue.Furthermore, the relative dimensions of the different parts of the line are chosen so as to obtain, in a manner known per se, a halving of the radioelectric energy at the point of the excitation point of the horizontal dipole . We will thus have two orthogonal components of the same amplitude to achieve the desired circular polarization.
Enfin, l'antenne comporte, à un quart d'onde en arrière du dipôle vertical 20, un réseau de fils 40 qui réalise deux fonctions essentielles :
- tout d'abord, il constitue le plan de court-circuit du dipôle vertical 20, puisque les fils du réseau 40 sont parallèles à l'orientation de ce dipôle, et
- il fait office de filtre de polarisation croisée (notamment en réception) pour le dipôle horizontal 10, afin que l'onde émise ou reçue par ce dernier soit la plus linéairement polarisée possible dans le sens horizontal.Finally, the antenna comprises, at a quarter wave behind the
first of all, it constitutes the short-circuit plane of the
- It acts as a cross polarization filter (in particular for reception) for the
Avantageusement, le réseau de fils 40 peut être monté sur la face arrière d'un radôme 41, par exemple un radôme formé d'une mousse légère dans laquelle seront noyés les dipôles verticaux 20 du réseau d'antennes. Le radôme et la trame sont maintenus à une distance précise du plan de masse 4 au moyen d'entretoises 42.Advantageously, the array of
Claims (5)
caractérisée en ce qu'elle comporte, à l'extrémité de la ligne triplaque d'alimentation :
- un premier élément rayonnant dipolaire (10), comprenant deux branches quart d'onde (11, 11′) formées en prolongeant dans leur plan, en direction transversale et dans un même sens, chacun des conducteurs périphériques (3, 3′), et une branche quart d'onde (12) formée en prolongeant dans son plan, parallèlement aux deux branches précitées mais en sens opposé, le conducteur central (2),
- un second élément rayonnant dipolaire (20), orthogonal au premier, comprenant deux branches quart d'onde (21, 22) formées par repliement, dans des sens opposés, du conducteur central (2) et de l'un (3) des conducteurs périphériques, ces deux branches quart d'onde étant coplanaires et s'étendant perpendiculairement aux plans des conducteurs, et
- des moyens répartiteurs et déphaseurs (30), pour exciter les éléments rayonnants dipolaires (10, 20) par des signaux respectifs semblables, de même amplitude mais déphasés de 90 .1. An antenna with circular polarization, in particular an elementary antenna for array of antennas, this antenna being excited by a 'three-plate feed line (1) comprising two peripheral conductors (3, 3 ′) disposed respectively above and at below a central conductor (2), said antenna comprising dipolar radiating elements formed in said peripheral conductors,
characterized in that it comprises, at the end of the three-plate feed line:
- a first dipolar radiating element (10), comprising two quarter-wave branches (11, 11 ′) formed by extending in their plane, in transverse direction and in the same direction, each of the peripheral conductors (3, 3 ′), and a quarter wave branch (12) formed by extending in its plane, parallel to the two aforementioned branches but in opposite directions, the central conductor (2),
- a second dipolar radiating element (20), orthogonal to the first, comprising two quarter-wave branches (21, 22) formed by folding, in opposite directions, the central conductor (2) and one (3) of the peripheral conductors, these two quarter-wave branches being coplanar and extending perpendicular to the planes of the conductors, and
- distributor and phase shifter means (30), to excite the dipole radiating elements (10, 20) by respective similar signals, of the same amplitude but phase shifted by 90.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8915473A FR2655201B1 (en) | 1989-11-24 | 1989-11-24 | CIRCULAR POLARIZATION ANTENNA, ESPECIALLY FOR ANTENNA NETWORK. |
| FR8915473 | 1989-11-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0429338A1 true EP0429338A1 (en) | 1991-05-29 |
Family
ID=9387749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90403208A Withdrawn EP0429338A1 (en) | 1989-11-24 | 1990-11-13 | Circularly polarised antenna particularly for antenna arrays |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5172129A (en) |
| EP (1) | EP0429338A1 (en) |
| JP (1) | JPH03175802A (en) |
| CA (1) | CA2029380A1 (en) |
| FR (1) | FR2655201B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6052889A (en) * | 1996-11-21 | 2000-04-25 | Raytheon Company | Radio frequency antenna and its fabrication |
| US20030048226A1 (en) * | 2001-01-31 | 2003-03-13 | Tantivy Communications, Inc. | Antenna for array applications |
| WO2013141922A2 (en) * | 2011-12-20 | 2013-09-26 | Sadar 3D, Inc. | Systems, apparatus, and methods for data acquisiton and imaging |
| US9577341B2 (en) * | 2013-11-12 | 2017-02-21 | Harris Corporation | Microcellular communications antenna and associated methods |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1416343A (en) * | 1972-02-16 | 1975-12-03 | Secr Defence | Radomes |
| GB2048571A (en) * | 1979-05-03 | 1980-12-10 | Marconi Co Ltd | Circularly polarised antenna array |
| EP0156684A1 (en) * | 1984-02-24 | 1985-10-02 | Thomson-Csf | Microwave radiating element and its use in an electronically scanned array |
| GB2191044A (en) * | 1986-05-28 | 1987-12-02 | Gen Electric Co Plc | Antenna arrangement |
| US4772890A (en) * | 1985-03-05 | 1988-09-20 | Sperry Corporation | Multi-band planar antenna array |
| GB2207005A (en) * | 1987-07-15 | 1989-01-18 | Gen Electric Co Plc | Antenna |
| GB2211024A (en) * | 1987-10-10 | 1989-06-21 | Gen Electric Co Plc | Antennas |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2594260B1 (en) * | 1981-05-22 | 1989-01-13 | Thomson Csf | MICROWAVE PRIMARY SOURCE FOR CONE SCANNING ANTENNA AND ANTENNA INCORPORATING SAME. |
-
1989
- 1989-11-24 FR FR8915473A patent/FR2655201B1/en not_active Expired - Lifetime
-
1990
- 1990-10-31 US US07/606,174 patent/US5172129A/en not_active Expired - Fee Related
- 1990-11-06 CA CA002029380A patent/CA2029380A1/en not_active Abandoned
- 1990-11-13 EP EP90403208A patent/EP0429338A1/en not_active Withdrawn
- 1990-11-22 JP JP2320516A patent/JPH03175802A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1416343A (en) * | 1972-02-16 | 1975-12-03 | Secr Defence | Radomes |
| GB2048571A (en) * | 1979-05-03 | 1980-12-10 | Marconi Co Ltd | Circularly polarised antenna array |
| EP0156684A1 (en) * | 1984-02-24 | 1985-10-02 | Thomson-Csf | Microwave radiating element and its use in an electronically scanned array |
| US4772890A (en) * | 1985-03-05 | 1988-09-20 | Sperry Corporation | Multi-band planar antenna array |
| GB2191044A (en) * | 1986-05-28 | 1987-12-02 | Gen Electric Co Plc | Antenna arrangement |
| GB2207005A (en) * | 1987-07-15 | 1989-01-18 | Gen Electric Co Plc | Antenna |
| GB2211024A (en) * | 1987-10-10 | 1989-06-21 | Gen Electric Co Plc | Antennas |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2655201A1 (en) | 1991-05-31 |
| FR2655201B1 (en) | 1992-06-19 |
| CA2029380A1 (en) | 1991-05-25 |
| US5172129A (en) | 1992-12-15 |
| JPH03175802A (en) | 1991-07-30 |
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