EP1432073A1 - Coaxial collinear antenna - Google Patents

Coaxial collinear antenna Download PDF

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Publication number
EP1432073A1
EP1432073A1 EP03293087A EP03293087A EP1432073A1 EP 1432073 A1 EP1432073 A1 EP 1432073A1 EP 03293087 A EP03293087 A EP 03293087A EP 03293087 A EP03293087 A EP 03293087A EP 1432073 A1 EP1432073 A1 EP 1432073A1
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EP
European Patent Office
Prior art keywords
radiating
cylindrical
antenna
conductive
zones
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Granted
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EP03293087A
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German (de)
French (fr)
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EP1432073B1 (en
Inventor
Frédéric DIXIMUS
David Oliveira
Daniel Leclerc
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Amphenol Socapex SA
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Amphenol Socapex SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
    • H01Q21/10—Collinear arrangements of substantially straight elongated conductive units

Definitions

  • the subject of the present invention is a collinear antenna of the alternating coaxial type.
  • each dipole D1 is constituted by a tube element conductor 10 and the antenna further comprises two conductive elements parallel straight lines 12 and 14.
  • the conductive cylinders 10, 12, 14, etc., constituting the dipoles D1, D2, D3 are alternately welded on one of the conductors 12 and 14 and surround the other conductor.
  • the dipole D1 consists of the cylindrical element 10 coaxial with the element conductor 14 and soldered to the conductive element 12.
  • the elements DF phase shifters consist in the fact that the same conductive element 12, 14 goes from a position where it is soldered onto the conductive element cylindrical at a position in which it is arranged along the axis of the next cylindrical conductive element.
  • This change in layout roughly corresponds to a phase shift of ⁇ / 2. So we get overall an addition of the currents flowing in the portions of the conductors 12 and 14 corresponding to the different dipoles.
  • the alternate position of the conductive cylinders, in relation to the two straight conductive elements causes the radiation pattern of the entire antenna is not symmetrical, and the antenna is therefore not omnidirectional.
  • each dipole is consisting of the cylindrical conductor element and the linear conductor arranged along the axis of this cylinder. It follows from this configuration that the physical length of the cylindrical tube does not correspond to the length radiant of it. The antenna is therefore not suitably granted on the frequency of work thereof.
  • An object of the present invention is to provide an antenna collinear of the alternating coaxial type which makes it possible to obtain a distribution of current on the antenna such that the radiation pattern is actually omnidirectional.
  • the dipoles successive are constituted by radiating elements formed from a conductive cylindrical element and two cylindrical elements conductors and that, in addition, the antenna has three elements linear conductors, the antenna structure is symmetrical and the field radiated electric is therefore also radiated.
  • Each cylindrical element of length I internally comprises a disc made of a dielectric material of coefficient ⁇ , orthogonal to the wire element, the length I 1 of which in the direction of the wire element is such that:
  • 1 ⁇ / 2
  • FIG. 2 shows the entire antenna 20. Functionally, this consists of a radiating part 22, one end blocking 24 opposite the connection area of the antenna cable 26 and its end close to its connection to the cable, the antenna includes preferably two current traps referenced 28 and 30 respectively.
  • the radiating part 20 of the antenna consists of a succession of radiating or radiant zones formed by first radiating zones 32 1 , 32 2 , etc., and by second radiating zones 34 1 , 34 2 , etc., the second radiating zones being arranged alternately with the first radiating zones.
  • the radiating part 22 of the antenna is produced from three rectilinear conductors 36, 38 and 40 parallel to each other.
  • the conductor 38 will be called the central linear conductor and the other two conductors will be called the lateral linear conductors. The latter are equidistant from the central conductor 38.
  • the first radiating zones 32 1 , 32 2 , etc. are constituted by two cylindrical conducting surfaces respectively referenced 42 and 44.
  • the second radiating zones 34 1 , 34 2 , etc. are constituted by a single substantially cylindrical conductive surface 46.
  • the second radiating zone 34 i is, as already indicated, constituted by a conductive cylinder 36 whose diameter d is substantially equal to the distance which separates the lateral rectilinear conductors 36 and 40.
  • the cylinders 46, constituting the second zones radiating, have a length L.
  • the axis XX 'of the cylinder 46 is coincident with the central rectilinear conductor 38 while its external face 36a is welded to the lateral conductors 36 and 40. An electrical connection is thus established between the cylinders 46 constituting the second radiating zones 34 i and the lateral conductors 36 and 40.
  • the first radiating zones 32 i are, as already indicated, constituted by two conductive cylinders 42 and 44 both identical and preferably identical to the cylinder 46 constituting the second radiating zone 34 i .
  • the cylinders 42 and 44 therefore also have a diameter d and a length L.
  • Each cylinder 42, 44 has its axis YY 'and ZZ' respectively, coincident with the lateral rectilinear conductors 36 and 40 respectively.
  • the external face 44a and 42a of the cylinders respectively conductors 42 and 44 is soldered to the central conductor 38. An electrical connection is thus established between the pairs of cylinders 42 and 44 constituting the first radiating zones 32 i and the central conductor 38.
  • the length L of the cylinders 42, 44 and 46 corresponds at half wavelength ⁇ / 2.
  • this space has a length e.
  • the different rectilinear conductors 36, 38 and 40 pass from a position of coaxiality to a position of connection to the conductive cylinder, thus substantially a 180 ° phase shift between two successive radiating zones, which effectively makes it possible to obtain the sum of the currents flowing in each radiating zone in transmission or in reception.
  • the bandwidth of the antenna is improved if the diameter d of the conductive cylindrical surfaces 42, 44 and 46 is increased.
  • a suitable value of d is 0.08 ⁇ .
  • the phase shifts in the conductive cylindrical surfaces and in the rectilinear conductors 36, 38 and 40 are different for the same physical length of conductor.
  • a dielectric disc 50 is mounted inside the conductive cylinder 42, 44 or 46 which can, for example, be made of Teflon . The introduction of this disc 50 makes it possible to compensate for the electrical length in the conductive cylinder 42 and in the rectilinear conductor 40.
  • the antenna 20 also comprises, at its end 52 of connection to the antenna coaxial cable 26, two current traps 28 and 30.
  • Each current trap 28, 30 is constituted by a surface conductive cylindrical 54, 56 coaxial with cable 26 and whose length L ' corresponds to ⁇ / 4, ⁇ being the working wavelength of the antenna.
  • the lower end 54a, 56a of the cylinders 54 and 56 is connected to the external face 26a of the coaxial cable 26 by an annular portion 58 and 60 also conductive.
  • the radiating zones consist of one or two cylindrical conductive surfaces of ratio L / d, the ratio is around 5.
  • the antenna Due to the realization of the alternating radiating zones consisting of a conductive cylindrical surface and two surfaces conductive cylindrical, the antenna has overall symmetry geometric with respect to the central rectilinear conductor 38. We obtain thus a most omnidirectional azimuth radiation pattern possible.
  • the realization of the antenna is simple since it consists in the welding of the conductive cylindrical surfaces 42, 44 and 46 on the rectilinear electrical conductors 36, 38 and 40. It is necessary to add that, in the case where each conductive cylinder is equipped with a disc dielectric, this dielectric disc at the same time constitutes a spacer for mechanical support of the conductive cylindrical surface relative to the rectilinear electrical conductor and centering of cylindrical tube / rod assemblies.

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Abstract

The collinear antenna has three wire conductors, a central and two outer conductors. There are a number of alternating radiating zones, alternating between a first and second element. Each radiating zone is formed from an outer cylindrical conductor (46).

Description

La présente invention a pour objet une antenne colinéaire du type coaxial alterné.The subject of the present invention is a collinear antenna of the alternating coaxial type.

De telles antennes ont déjà été décrites notamment dans le brevet US 2 158 376 dont une figure a été reproduite comme figure 1 annexée.Such antennas have already been described in particular in the US Patent 2,158,376 one figure of which has been reproduced as Figure 1 attached.

L'antenne est constituée par une suite de dipôles D1, D2, D3, etc. raccordés entre eux par des systèmes déphaseurs DF1, DF2, etc. Plus précisément, chaque dipôle D1 est constitué par un élément de tube conducteur 10 et l'antenne comporte en outre deux éléments conducteurs rectilignes parallèles 12 et 14. Les cylindres conducteurs 10, 12, 14, etc., constituant les dipôles D1, D2, D3 sont alternativement soudés sur un des conducteurs 12 et 14 et entourent l'autre conducteur. Par exemple, le dipôle D1 est constitué par l'élément cylindrique 10 coaxial à l'élément conducteur 14 et soudé sur l'élément conducteur 12. Les éléments déphaseurs DF consistent dans le fait qu'un même élément conducteur 12, 14 passe d'une position où il est soudé sur l'élément conducteur cylindrique à une position dans laquelle il est disposé selon l'axe de l'élément conducteur cylindrique suivant. Ce changement de disposition correspond sensiblement à un déphasage de λ/2. On obtient donc ainsi globalement une addition des courants circulant dans les portions des conducteurs 12 et 14 correspondant aux différents dipôles. Cependant, la position alternée des cylindres conducteurs, par rapport aux deux éléments rectilignes conducteurs fait que le diagramme de rayonnement de l'ensemble de l'antenne n'est pas symétrique, et l'antenne n'est donc pas omnidirectionnelle.The antenna consists of a series of dipoles D1, D2, D3, etc. connected together by phase shift systems DF1, DF2, etc. More precisely, each dipole D1 is constituted by a tube element conductor 10 and the antenna further comprises two conductive elements parallel straight lines 12 and 14. The conductive cylinders 10, 12, 14, etc., constituting the dipoles D1, D2, D3 are alternately welded on one of the conductors 12 and 14 and surround the other conductor. For example, the dipole D1 consists of the cylindrical element 10 coaxial with the element conductor 14 and soldered to the conductive element 12. The elements DF phase shifters consist in the fact that the same conductive element 12, 14 goes from a position where it is soldered onto the conductive element cylindrical at a position in which it is arranged along the axis of the next cylindrical conductive element. This change in layout roughly corresponds to a phase shift of λ / 2. So we get overall an addition of the currents flowing in the portions of the conductors 12 and 14 corresponding to the different dipoles. However, the alternate position of the conductive cylinders, in relation to the two straight conductive elements causes the radiation pattern of the entire antenna is not symmetrical, and the antenna is therefore not omnidirectional.

Un autre inconvénient de l'antenne décrite dans le brevet américain mentionné ci-dessus réside dans le fait que chaque dipôle est constitué par l'élément conducteur cylindrique et le conducteur linéaire disposé selon l'axe de ce cylindre. Il résulte de cette configuration que la longueur physique du tube cylindrique ne correspond pas à la longueur rayonnante de celui-ci. L'antenne n'est donc pas convenablement accordée sur la fréquence de travail de celle-ci.Another disadvantage of the antenna described in the patent American mentioned above is that each dipole is consisting of the cylindrical conductor element and the linear conductor arranged along the axis of this cylinder. It follows from this configuration that the physical length of the cylindrical tube does not correspond to the length radiant of it. The antenna is therefore not suitably granted on the frequency of work thereof.

Un objet de la présente invention est de fournir une antenne colinéaire du type coaxial alterné qui permette d'obtenir une distribution de courant sur l'antenne telle que le diagramme de rayonnement est effectivement omnidirectionnel. An object of the present invention is to provide an antenna collinear of the alternating coaxial type which makes it possible to obtain a distribution of current on the antenna such that the radiation pattern is actually omnidirectional.

Pour atteindre ce but selon l'invention, une antenne du type colinéaire est caractérisée en ce qu'elle comprend une partie rayonnante comportant :

  • trois éléments filaires conducteurs sensiblement rectilignes et parallèles entre eux, comprenant un conducteur central et deux conducteurs latéraux ; et
  • 2N zones rayonnantes constituées par une alternance de premières zones rayonnantes et de deuxièmes zones rayonnantes :
    • chaque première zone rayonnante comprenant en outre un élément conducteur cylindrique dont l'axe est confondu avec ledit élément filaire central et qui est relié électriquement auxdits deux éléments filaires latéraux ;
    • chaque deuxième zone rayonnante comprenant en outre deux éléments conducteurs cylindriques dont les axes sont respectivement sensiblement confondus avec les éléments filaires latéraux, lesdits éléments cylindriques étant reliés électriquement audit élément filaire central ; un espace étant laissé entre deux zones rayonnantes consécutives.
To achieve this object according to the invention, an antenna of the collinear type is characterized in that it comprises a radiating part comprising:
  • three conductive wire elements which are substantially rectilinear and mutually parallel, comprising a central conductor and two lateral conductors; and
  • 2N radiating zones constituted by an alternation of first radiating zones and second radiating zones:
    • each first radiating zone further comprising a cylindrical conductive element the axis of which coincides with said central wire element and which is electrically connected to said two lateral wire elements;
    • each second radiating zone further comprising two cylindrical conductive elements whose axes are respectively substantially coincident with the lateral wire elements, said cylindrical elements being electrically connected to said central wire element; a space is left between two consecutive radiating zones.

On comprend en effet que, grâce au fait que les dipôles successifs sont constitués par des éléments rayonnants formés à partir d'un élément cylindrique conducteur et de deux éléments cylindriques conducteurs et que, de plus, l'antenne comporte trois éléments conducteurs linéaires, la structure de l'antenne est symétrique et le champ électrique rayonné l'est donc également.We understand that, thanks to the fact that the dipoles successive are constituted by radiating elements formed from a conductive cylindrical element and two cylindrical elements conductors and that, in addition, the antenna has three elements linear conductors, the antenna structure is symmetrical and the field radiated electric is therefore also radiated.

Chaque élément cylindrique de longueur I comprend intérieurement un disque en un matériau diélectrique de coefficient ε, orthogonal à l'élément filaire, dont la longueur I1 selon la direction de l'élément filaire est telle que : | + ε |1 = λ/2 Each cylindrical element of length I internally comprises a disc made of a dielectric material of coefficient ε, orthogonal to the wire element, the length I 1 of which in the direction of the wire element is such that: | + ε | 1 = λ / 2

Grâce à la présence du disque en matériau diélectrique à l'intérieur de chaque élément conducteur cylindrique, on peut compenser la différence qui existe entre la longueur physique du conducteur cylindrique et sa longueur électrique en tant qu'antenne sans pour cela rendre plus complexe la réalisation de l'antenne. On comprend de plus que ces disques en matériau diélectrique permettent le maintien mécanique des éléments cylindriques par rapport aux éléments filaires conducteurs rectilignes.Thanks to the presence of the dielectric material disc at inside each cylindrical conductive element, we can compensate the difference between the physical length of the conductor cylindrical and its electrical length as an antenna without this make the creation of the antenna more complex. We also understand that these dielectric discs allow the maintenance mechanics of cylindrical elements compared to wire elements straight conductors.

D'autres caractéristiques et avantages de l'invention apparaítront mieux à la lecture de la description qui suit de plusieurs modes de réalisation de l'invention donnés à titre d'exemples non limitatifs.Other characteristics and advantages of the invention will appear better on reading the following description of several embodiments of the invention given by way of examples not limiting.

La description se réfère aux figures annexées, sur lesquelles :

  • la figure 1 déjà décrite montre une antenne colinéaire coaxiale alternée de type connu ;
  • la figure 2 est une vue en perspective de l'ensemble de l'antenne conforme à l'invention ;
  • la figure 3 est une vue en coupe verticale partielle de l'antenne selon l'invention ; et
  • la figure 4 est une vue partielle montrant une zone rayonnante d'un type perfectionné.
The description refers to the appended figures, in which:
  • Figure 1 already described shows an alternate coaxial collinear antenna of known type;
  • Figure 2 is a perspective view of the entire antenna according to the invention;
  • Figure 3 is a partial vertical sectional view of the antenna according to the invention; and
  • Figure 4 is a partial view showing a radiating area of an improved type.

La figure 2 montre l'ensemble de l'antenne 20. Fonctionnellement, celle-ci est constituée par une partie rayonnante 22, une extrémité de blocage 24 opposée à la zone de connexion du câble d'antenne 26 et à son extrémité proche de sa connexion au câble, l'antenne comprend de préférence deux pièges à courant référencés respectivement 28 et 30.FIG. 2 shows the entire antenna 20. Functionally, this consists of a radiating part 22, one end blocking 24 opposite the connection area of the antenna cable 26 and its end close to its connection to the cable, the antenna includes preferably two current traps referenced 28 and 30 respectively.

La partie rayonnante 20 de l'antenne est constituée par une succession de zones rayonnantes ou radiantes formées par des premières zones rayonnantes 321, 322, etc., et par des deuxièmes zones rayonnantes 341, 342, etc., les deuxièmes zones rayonnantes étant disposées en alternance avec les premières zones rayonnantes.The radiating part 20 of the antenna consists of a succession of radiating or radiant zones formed by first radiating zones 32 1 , 32 2 , etc., and by second radiating zones 34 1 , 34 2 , etc., the second radiating zones being arranged alternately with the first radiating zones.

Du point de vue de sa construction, la partie rayonnante 22 de l'antenne est réalisée à partir de trois conducteurs rectilignes 36, 38 et 40 parallèles entre eux. Le conducteur 38 sera appelé conducteur linéaire central et les deux autres conducteurs seront appelés conducteurs linéaires latéraux. Ces derniers sont équidistants du conducteur central 38. Les premières zones rayonnantes 321, 322, etc., sont constituées par deux surfaces conductrices cylindriques respectivement référencées 42 et 44. Les deuxièmes zones rayonnantes 341, 342, etc., sont constituées par une unique surface conductrice sensiblement cylindrique 46. From the point of view of its construction, the radiating part 22 of the antenna is produced from three rectilinear conductors 36, 38 and 40 parallel to each other. The conductor 38 will be called the central linear conductor and the other two conductors will be called the lateral linear conductors. The latter are equidistant from the central conductor 38. The first radiating zones 32 1 , 32 2 , etc., are constituted by two cylindrical conducting surfaces respectively referenced 42 and 44. The second radiating zones 34 1 , 34 2 , etc., are constituted by a single substantially cylindrical conductive surface 46.

En se référant maintenant à la figure 3, on va décrire plus en détail la réalisation des premières zones rayonnantes 32i et des deuxièmes zones rayonnantes 34i.Referring now to FIG. 3, the embodiment of the first radiating zones 32 i and of the second radiating zones 34 i will be described in more detail.

La deuxième zone rayonnante 34i est, comme on l'a déjà indiqué, constituée par un cylindre conducteur 36 dont le diamètre d est sensiblement égal à la distance qui sépare les conducteurs rectilignes latéraux 36 et 40. Les cylindres 46, constituant les deuxièmes zones rayonnantes, présentent une longueur L. L'axe X-X' du cylindre 46 est confondu avec le conducteur rectiligne central 38 alors que sa face externe 36a est soudée sur les conducteurs latéraux 36 et 40. On établit ainsi une connexion électrique entre les cylindres 46 constituant les deuxièmes zones rayonnantes 34i et les conducteurs latéraux 36 et 40.The second radiating zone 34 i is, as already indicated, constituted by a conductive cylinder 36 whose diameter d is substantially equal to the distance which separates the lateral rectilinear conductors 36 and 40. The cylinders 46, constituting the second zones radiating, have a length L. The axis XX 'of the cylinder 46 is coincident with the central rectilinear conductor 38 while its external face 36a is welded to the lateral conductors 36 and 40. An electrical connection is thus established between the cylinders 46 constituting the second radiating zones 34 i and the lateral conductors 36 and 40.

Les premières zones rayonnantes 32i sont, comme on l'a déjà indiqué, constituées par deux cylindres conducteurs 42 et 44 identiques tous les deux et de préférence identiques au cylindre 46 constituant la deuxième zone rayonnante 34i. Les cylindres 42 et 44 ont donc également un diamètre d et une longueur L. Chaque cylindre 42, 44 a son axe respectivement Y-Y' et Z-Z' confondu respectivement avec les conducteurs rectilignes latéraux 36 et 40. La face externe respectivement 44a et 42a des cylindres conducteurs 42 et 44 est soudée sur le conducteur central 38. On établit ainsi une connexion électrique entre les paires de cylindres 42 et 44 constituant les premières zones rayonnantes 32i et le conducteur central 38. La longueur L des cylindres 42, 44 et 46 correspond à la demi-longueur d'onde λ/2.The first radiating zones 32 i are, as already indicated, constituted by two conductive cylinders 42 and 44 both identical and preferably identical to the cylinder 46 constituting the second radiating zone 34 i . The cylinders 42 and 44 therefore also have a diameter d and a length L. Each cylinder 42, 44 has its axis YY 'and ZZ' respectively, coincident with the lateral rectilinear conductors 36 and 40 respectively. The external face 44a and 42a of the cylinders respectively conductors 42 and 44 is soldered to the central conductor 38. An electrical connection is thus established between the pairs of cylinders 42 and 44 constituting the first radiating zones 32 i and the central conductor 38. The length L of the cylinders 42, 44 and 46 corresponds at half wavelength λ / 2.

Il faut ajouter qu'un espace, qui sera défini ultérieurement 48i, est prévu entre les différentes zones rayonnantes 32i et 34i, cet espace présente une longueur e.It should be added that a space, which will be defined later 48 i , is provided between the different radiating zones 32 i and 34 i , this space has a length e.

Du fait qu'à chaque passage d'une première zone rayonnante 32i à une deuxième zone rayonnante 34i, les différents conducteurs rectilignes 36, 38 et 40 passent d'une position de coaxialité à une position de connexion au cylindre conducteur, on obtient ainsi sensiblement un déphasage de 180° entre deux zones rayonnantes successives, ce qui permet d'obtenir effectivement la somme des courants circulant dans chaque zone rayonnante en émission ou en réception.Because at each passage from a first radiating zone 32 i to a second radiating zone 34 i , the different rectilinear conductors 36, 38 and 40 pass from a position of coaxiality to a position of connection to the conductive cylinder, thus substantially a 180 ° phase shift between two successive radiating zones, which effectively makes it possible to obtain the sum of the currents flowing in each radiating zone in transmission or in reception.

La bande passante de l'antenne est améliorée si on augmente le diamètre d des surfaces cylindriques conductrices 42, 44 et 46. Une valeur convenable de d est de 0,08 λ. Cependant, les déphasages dans les surfaces cylindriques conductrices et dans les conducteurs rectilignes 36, 38 et 40 sont différents pour une même longueur physique de conducteur. Pour compenser ces déphasages différents, selon un mode perfectionné de réalisation de l'antenne représentée sur la figure 4, on monte à l'intérieur du cylindre conducteur 42, 44 ou 46 un disque diélectrique 50 qui peut, par exemple, être réalisé en Téflon. L'introduction de ce disque 50 permet de compenser la longueur électrique dans le cylindre conducteur 42 et dans le conducteur rectiligne 40. La longueur l' du disque diélectrique 50 selon la direction du conducteur rectiligne 40 peut être déterminée de la manière suivante. Si l'on appelle l' la longueur du diélectrique de constante diélectrique ε et I la longueur du cylindre 42, on doit avoir la relation. λ/2 = | + ε|' The bandwidth of the antenna is improved if the diameter d of the conductive cylindrical surfaces 42, 44 and 46 is increased. A suitable value of d is 0.08 λ. However, the phase shifts in the conductive cylindrical surfaces and in the rectilinear conductors 36, 38 and 40 are different for the same physical length of conductor. To compensate for these different phase shifts, according to an improved embodiment of the antenna shown in FIG. 4, a dielectric disc 50 is mounted inside the conductive cylinder 42, 44 or 46 which can, for example, be made of Teflon . The introduction of this disc 50 makes it possible to compensate for the electrical length in the conductive cylinder 42 and in the rectilinear conductor 40. The length l 'of the dielectric disc 50 according to the direction of the rectilinear conductor 40 can be determined as follows. If we call the length of the dielectric with a dielectric constant ε and I the length of cylinder 42, we must have the relation. λ / 2 = | + ε | '

Ainsi qu'on l'a déjà indiqué en liaison avec la figure 2, de préférence l'antenne 20 comprend également, à son extrémité 52 de raccordement au câble coaxial d'antenne 26, deux pièges à courant 28 et 30. Chaque piège à courant 28, 30 est constitué par une surface cylindrique conductrice 54, 56 coaxiale au câble 26 et dont la longueur L' correspond à λ/4, λ étant la longueur d'onde de travail de l'antenne. L'extrémité inférieure 54a, 56a des cylindres 54 et 56 est raccordée à la face externe 26a du câble coaxial 26 par une portion annulaire 58 et 60 également conductrice.As already indicated in connection with Figure 2, preferably the antenna 20 also comprises, at its end 52 of connection to the antenna coaxial cable 26, two current traps 28 and 30. Each current trap 28, 30 is constituted by a surface conductive cylindrical 54, 56 coaxial with cable 26 and whose length L ' corresponds to λ / 4, λ being the working wavelength of the antenna. The lower end 54a, 56a of the cylinders 54 and 56 is connected to the external face 26a of the coaxial cable 26 by an annular portion 58 and 60 also conductive.

Dans un mode préféré de réalisation, l'antenne comporte N = 14 zones rayonnantes. Les zones rayonnantes sont constituées par une ou deux surfaces conductrices cylindriques de rapport L/d, le rapport est de l'ordre de 5.In a preferred embodiment, the antenna comprises N = 14 radiating zones. The radiating zones consist of one or two cylindrical conductive surfaces of ratio L / d, the ratio is around 5.

Avec cette antenne, on obtient pour la longueur d'onde de travail de 52 mm, une bande passante de l'ordre de 2,5 % et un gain de 10 dBiso.With this antenna, we obtain for the wavelength of 52 mm work, a bandwidth of the order of 2.5% and a gain of 10 dBiso.

Du fait de la réalisation des zones rayonnantes alternées constituées par une surface cylindrique conductrice et deux surfaces cylindriques conductrices, l'antenne présente globalement une symétrie géométrique par rapport au conducteur rectiligne central 38. On obtient ainsi un diagramme de rayonnement en azimut le plus omnidirectionnel possible. En outre, la réalisation de l'antenne est simple puisqu'elle consiste dans le soudage des surfaces cylindriques conductrices 42, 44 et 46 sur les conducteurs électriques rectilignes 36, 38 et 40. Il faut ajouter que, dans le cas où chaque cylindre conducteur est équipé d'un disque diélectrique, ce disque diélectrique constitue en même temps une entretoise de maintien mécanique de la surface cylindrique conductrice par rapport au conducteur électrique rectiligne et un centrage des ensembles tubes cylindriques/tiges.Due to the realization of the alternating radiating zones consisting of a conductive cylindrical surface and two surfaces conductive cylindrical, the antenna has overall symmetry geometric with respect to the central rectilinear conductor 38. We obtain thus a most omnidirectional azimuth radiation pattern possible. In addition, the realization of the antenna is simple since it consists in the welding of the conductive cylindrical surfaces 42, 44 and 46 on the rectilinear electrical conductors 36, 38 and 40. It is necessary to add that, in the case where each conductive cylinder is equipped with a disc dielectric, this dielectric disc at the same time constitutes a spacer for mechanical support of the conductive cylindrical surface relative to the rectilinear electrical conductor and centering of cylindrical tube / rod assemblies.

Claims (5)

Antenne du type colinéaire caractérisée en ce qu'elle comprend une partie rayonnante comportant : trois éléments filaires conducteurs sensiblement rectilignes et parallèles entre eux, comprenant un conducteur central et deux conducteurs latéraux ; et 2N zones rayonnantes constituées par une alternance de premières zones rayonnantes et de deuxièmes zones rayonnantes : chaque première zone rayonnante comprenant en outre un élément conducteur cylindrique dont l'axe est confondu avec ledit élément filaire central et qui est relié électriquement auxdits deux éléments filaires latéraux ; chaque deuxième zone rayonnante comprenant en outre deux éléments conducteurs cylindriques dont les axes sont respectivement sensiblement confondus avec les éléments filaires latéraux, lesdits éléments cylindriques étant reliés électriquement audit élément filaire central ; un espace étant laissé entre deux zones rayonnantes consécutives. Colinear type antenna characterized in that it comprises a radiating part comprising: three conductive wire elements which are substantially rectilinear and mutually parallel, comprising a central conductor and two lateral conductors; and 2N radiating zones constituted by an alternation of first radiating zones and second radiating zones: each first radiating zone further comprising a cylindrical conductive element the axis of which coincides with said central wire element and which is electrically connected to said two lateral wire elements; each second radiating zone further comprising two cylindrical conductive elements whose axes are respectively substantially coincident with the lateral wire elements, said cylindrical elements being electrically connected to said central wire element; a space is left between two consecutive radiating zones. Antenne selon la revendication 1, caractérisée en ce que chaque élément cylindrique résonne à la demi-longueur d'onde.Antenna according to claim 1, characterized in that each cylindrical element resonates at half the wavelength. Antenne selon la revendication 2, caractérisée en ce que chaque élément cylindrique de longueur I comprend intérieurement un disque en un matériau diélectrique de coefficient ε, orthogonal à l'élément filaire, dont la longueur I1 selon la direction de l'élément filaire est telle que : I + ε I1 = λ/2 Antenna according to claim 2, characterized in that each cylindrical element of length I internally comprises a disc made of a dielectric material of coefficient ε, orthogonal to the wire element, the length I 1 of which in the direction of the wire element is such than : I + ε I 1 = λ / 2 Antenne selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'elle comprend à son extrémité de raccordement au câble d'antenne au moins un piège à courant comprenant au moins un élément conducteur entourant ledit câble, de longueur λ/4 et relié électriquement audit câble.Antenna according to any one of claims 1 to 3, characterized in that it comprises at its end for connection to the antenna cable at least one current trap comprising at least one conductive element surrounding said cable, of length λ / 4 and electrically connected to said cable. Antenne selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le rapport entre la longueur d'un élément conducteur cylindrique et son diamètre est de l'ordre de 5.Antenna according to any one of claims 1 to 4, characterized in that the ratio between the length of a cylindrical conducting element and its diameter is of the order of 5.
EP03293087A 2002-12-20 2003-12-10 Coaxial collinear antenna Expired - Lifetime EP1432073B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0216293 2002-12-20
FR0216293A FR2849289B1 (en) 2002-12-20 2002-12-20 COLORED ANTENNA OF ALTERNATE COAXIAL TYPE

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EP1432073A1 true EP1432073A1 (en) 2004-06-23
EP1432073B1 EP1432073B1 (en) 2006-02-22

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US (1) US6947006B2 (en)
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JP (1) JP2004208285A (en)
AT (1) ATE318454T1 (en)
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FR (1) FR2849289B1 (en)

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Also Published As

Publication number Publication date
FR2849289A1 (en) 2004-06-25
JP2004208285A (en) 2004-07-22
DE60303659D1 (en) 2006-04-27
FR2849289B1 (en) 2005-03-18
ATE318454T1 (en) 2006-03-15
US20040125038A1 (en) 2004-07-01
EP1432073B1 (en) 2006-02-22
US6947006B2 (en) 2005-09-20

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