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EP0014635A1 - Dipole fed open cavity antenna - Google Patents

Dipole fed open cavity antenna Download PDF

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Publication number
EP0014635A1
EP0014635A1 EP80400139A EP80400139A EP0014635A1 EP 0014635 A1 EP0014635 A1 EP 0014635A1 EP 80400139 A EP80400139 A EP 80400139A EP 80400139 A EP80400139 A EP 80400139A EP 0014635 A1 EP0014635 A1 EP 0014635A1
Authority
EP
European Patent Office
Prior art keywords
source according
radiant source
cavity
dipole
dielectric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP80400139A
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German (de)
French (fr)
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EP0014635B1 (en
Inventor
Albert Dupressoir
Claude Bloch
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Thales SA
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Thomson CSF SA
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Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0014635A1 publication Critical patent/EP0014635A1/en
Application granted granted Critical
Publication of EP0014635B1 publication Critical patent/EP0014635B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/06—Details
    • H01Q9/065—Microstrip dipole antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/18—Resonant slot antennas the slot being backed by, or formed in boundary wall of, a resonant cavity ; Open cavity antennas

Definitions

  • the present invention relates to a radiating source with an open cavity excited by a dipole.
  • This source preferably operates in the microwave domain and can be used as a primary source or as a radiating element of a network antenna.
  • Such a source with a cylindrical open cavity is constituted by a radiating dipole, placed inside a cylindrical metal base of circular cross section. Due to the phenomena of excitation of certain modes and of reflection in the cavity, the radiation diagram of such a source consists of concentric non-level circles until a decrease in gain of 10 dB, beyond which the circles make way for concentric ellipses. This lack of symmetry of the radiated diagram with respect to the direction of propagation limits the bandwidth of the usable frequencies.
  • the object of the invention is to define a radiating source with an open cylindrical cavity excited by a dipole, having a significant widening of the frequency band usable compared to the sources of the prior art.
  • a source according to the invention, then presents a radiation pattern of increased directivity and for which the symmetry defects are eliminated.
  • the radiating source comprises a cylindrical base cavity having, on the side of the emitted radiation, a opening comprising two diametrically opposite projections extending the cavity in the direction of the radiation and acting on it so as to improve its symmetry.
  • the radiating source comprises a cap covering the opening of the cavity which contributes to increasing the directivity of the radiation diagram.
  • FIG. 1 shows a radiating source with open cavity 1 of the prior art, metallic and of cylindrical shape, excited by a dipole 2 produced on a printed circuit 3, the assembly being connected to a conventional supply system 5.
  • FIG. 2 represents a view, from the side of the emitted radiation, of a radiating source 1 according to the invention.
  • the opening of the cavity 1 is formed by two concurrent oblique planes symmetrical with respect to in the longitudinal median plane of the cavity, normal to the longitudinal median plane comprising the strands 4 of the dipole 2 the intersection of these two planes thus forming two diametrically opposite projections 10.
  • the strands 4 of the radiating dipole 2 are obtained by photoengraving on a dielectric plate 3.
  • a cylindrical strapping 7 of dielectric is placed inside the cylindrical cavity 1.
  • the impedance of the cavity is adapted to the impedance of the air, thus allowing almost all of the energy to be radiated outside.
  • FIG. 3 is another embodiment of the invention, comprising a conventional radiating dipole 6, half-wave or whole wave.
  • the widening of the operating band of the radiating source is obtained on the one hand thanks to an improvement in the symmetry of the radiation diagram with respect to the direction of propagation, and on the other hand thanks to an increase in the directivity of this diagram.
  • the symmetry of the radiation pattern of the source is improved by the opening of the cavity, the latter having two diametrically opposite projections, as just described.
  • the increase in directivity is obtained by the addition of a hollow dielectric cap covering the opening of the cavity.
  • Figure 4 shows a tear from a source according to the invention. It is covered by a cap 12, in dielectric, hollow, frustoconical having an acute solid angle according to the direction of propagation of the radiation on emission and fitting onto the projections 10. The thickness of the cap decreases in this same direction of propagation.
  • the cavity is fed in its longitudinal axis of symmetry by a coaxial line 13.
  • the adaptation of the cavity 1 to the supply line 13 is produced by a quarter-wave transformer and balun, obtained from a quarter-wave coaxial line 14 on the external conductor of which two metallization savings 16 have been made.
  • the spares 16, symmetrical with respect to the longitudinal axis of the cavity, are included in the normal plane of the median plane comprising the strands 4 of the dipole deposited by photogravure on a dielectric plate 3.
  • the central conductor 17 of the coaxial line is a metal wire sheathed with dielectric 18. To perfect the agreement, a low-impedance ring not shown in the figure can be placed against the external wall of the coaxial line.
  • FIG. 5 is a cutaway from another radiating source 1 according to the invention, of metallized dielectric cylindrical base 19.
  • the metallization 21 of the base 19 is obtained by photoengraving.
  • the assembly of the dielectric cap 12 with the dielectric base 19 is done by a fitting 20 of the lower part of the cap in the base.
  • the strands 4 of the dipole are deposited by photoengraving on the dielectric base 19.
  • This embodiment of sources with metallized dielectric base has the advantage of a lower cost, especially for producing a large number of sources.
  • the electromagnetic performance is the same as for metal cavity sources.
  • FIG. 6 shows another type of embodiment of a radiating cavity source with a hollow dielectric cap, composed of coaxial cylindrical sections of diameter decreasing according to the direction of propagation on emission, and of different heights. The thickness of each cylindrical dielectric section also decreases according to the direction of propagation.
  • FIG. 7 shows another embodiment of a radiating source according to the invention, for which the open cavity has two opposite symmetrical slots 110 placed on a diameter perpendicular to the strands 4 of the dipole 2.
  • the cavity 1 can be made of metal or metallized dielectric, as described above.
  • a radiating source operating in C band of frequency, ie from 5450 to 5850 MHz, the following dimensions were obtained; diameter of the cavity between one to three wavelengths A depending on the type of dipole used; base height equal to half wavelength; optimal height of the points equal to ⁇ / 5.
  • the width of the slots is X / 2 and the height of ⁇ / 10.
  • its dimensions are obtained by homothety from the previous dimensions.
  • FIG. 8 schematically represents an example of array antenna where the elementary sources are produced according to the invention. They are arranged circularly on a metal support 23. All the dipoles 2 are oriented in the same direction which is that of the polarization of the antenna.
  • a radiating microwave source with an open cavity excited by a dipole the directivity and symmetry qualities of the radiation diagram with respect to the direction of propagation allow a frequency band of sound operation .. wider than that of radiating sources with open cavity excited by a dipole of the prior art.

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Abstract

Source hyperfréquence à cavité dont l'ouverture présente deux salles (10) s'avançant dans la direction de rayonnement et opposées sur un diamètre perpendiculaire aux brins (4) du dipôle (2) d'excitation. La cavité peut être recouverte par une coiffe diélectrique creuse (12). Utilisation dans les antennes-réseaux.Microwave cavity source, the opening of which presents two rooms (10) advancing in the direction of radiation and opposite on a diameter perpendicular to the strands (4) of the excitation dipole (2). The cavity can be covered by a hollow dielectric cap (12). Use in network antennas.

Description

La présente invention concerne une source rayonnante à cavité ouverte excitée par un dipôle. Cette source fonctionne de préférence dans le domaine des hyperfréquences et est utilisable comme source primaire ou comme élément rayonnant d'une antenne-réseau.The present invention relates to a radiating source with an open cavity excited by a dipole. This source preferably operates in the microwave domain and can be used as a primary source or as a radiating element of a network antenna.

Parmi les différents types de sources rayonnantes à cavité ouverte de l'art antérieur qui sont excitées par un dipôle, on considère plus particulièrement les sources comportant des cavités ouvertes de révolution, et parmi celles-ci des cavités cylindriques. Une telle source à cavité ouverte cylindrique est constituée par un dipôle rayonnant, placé à l'intérieur d'une embase métallique cylindrique de section droite circulaire. En raison des phénomènes d'excitation de certains modes et de réflexion dans la cavité le diagramme de rayonnement d'une telle source est constitué par des cercles insoniveaux concentriques jusqu'à une diminution de gain de 10 dB, au-delà de laquelle les cercles font place à des ellipses concentriques. Ce défaut de symétrie du diagramme rayonné par rapport à la direction de propagation limite la largeur de bande des fréquences utilisables.Among the different types of radiating sources with open cavity of the prior art which are excited by a dipole, we consider more particularly the sources comprising open cavities of revolution, and among these cylindrical cavities. Such a source with a cylindrical open cavity is constituted by a radiating dipole, placed inside a cylindrical metal base of circular cross section. Due to the phenomena of excitation of certain modes and of reflection in the cavity, the radiation diagram of such a source consists of concentric non-level circles until a decrease in gain of 10 dB, beyond which the circles make way for concentric ellipses. This lack of symmetry of the radiated diagram with respect to the direction of propagation limits the bandwidth of the usable frequencies.

Dans le cas d'une antenne-réseau, l'obtention d'un diagramme de rayonnement identique quelle que soit la direction de propagation nécessite la symétrie de révolution du diagramme de rayonnement de chaque source élémentaire de l'antenne-réseau, autour de son axe.In the case of a network antenna, obtaining an identical radiation diagram regardless of the direction of propagation requires the symmetry of revolution of the radiation diagram of each elementary source of the network antenna, around its axis.

Le but de l'invention est de définir une source rayonnante à cavité cylindrique ouverte excitée par un dipôle, présentant un élargissement notable de la bande des fréquences utilisables par rapport aux sources de l'art antérieur. Une telle source, suivant l'invention, présente alors un diagramme de rayonnement de directivité accrue et pour lequel les défauts de symétrie sont éliminés.The object of the invention is to define a radiating source with an open cylindrical cavity excited by a dipole, having a significant widening of the frequency band usable compared to the sources of the prior art. Such a source, according to the invention, then presents a radiation pattern of increased directivity and for which the symmetry defects are eliminated.

Suivant l'invention, la source rayonnante comprend une cavité d'embase cylindrique présentant, du côté du rayonnement émis, une ouverture comportant deux saillies diamétralement opposées prolongeant la cavité dans la direction du rayonnement et agissant sur lui de façon à améliorer sa symétrie.According to the invention, the radiating source comprises a cylindrical base cavity having, on the side of the emitted radiation, a opening comprising two diametrically opposite projections extending the cavity in the direction of the radiation and acting on it so as to improve its symmetry.

Suivant l'invention également, la source rayonnante comprend une coiffe recouvrant l'ouverture de la cavité qui contribue à accroître la directivité du diagramme de rayonnement.Also according to the invention, the radiating source comprises a cap covering the opening of the cavity which contributes to increasing the directivity of the radiation diagram.

D'autres objets et avantages de l'invention apparaîtront à l'aide de la description donnée ci-dessous, portant sur des exemples de réalisation, accompagnée par les figures suivantes représentant ;

  • - la figure 1, une source rayonnante de l'art antérieur ;
  • - la figure 2, une source rayonnante suivant l'invention ;
  • - la figure 3, une autre réalisation d'une source rayonnante suivant l'invention ;
  • - la figure 4, un arraché d'une source rayonnante équipée d'une coiffe, conformément à l'invention ;
  • - la figure 5, un arraché d'une autre réalisation d'une source rayonnante conforme à l'invention ;
  • - la figure 6, une autre réalisation d'une source rayonnante équipée d'une coiffe, suivant l'invention ;
  • - la figure 7, une autre réalisation d'une source rayonnante suivant l'invention ;
  • - la figure 8, une antenne-réseau constituée de sources rayonnantes suivant l'invention.
Other objects and advantages of the invention will become apparent from the description given below, relating to exemplary embodiments, accompanied by the following figures representing;
  • - Figure 1, a radiating source of the prior art;
  • - Figure 2, a radiating source according to the invention;
  • - Figure 3, another embodiment of a radiating source according to the invention;
  • - Figure 4, a cutaway of a radiating source equipped with a cap, according to the invention;
  • - Figure 5, a cutaway of another embodiment of a radiating source according to the invention;
  • - Figure 6, another embodiment of a radiating source equipped with a cap, according to the invention;
  • - Figure 7, another embodiment of a radiating source according to the invention;
  • - Figure 8, a network antenna consisting of radiating sources according to the invention.

On notera que dans la description qui suit tout organe identique dans les figures portera les mêmes repères.It will be noted that in the description which follows, any identical member in the figures will bear the same references.

La figure 1 montre une source rayonnante à cavité ouverte 1 de l'art antérieur, métallique et de forme cylindrique, excitée par un dipôle 2 réalisé sur un circuit imprimé 3, l'ensemble étant relié à un système d'alimentation classique 5.FIG. 1 shows a radiating source with open cavity 1 of the prior art, metallic and of cylindrical shape, excited by a dipole 2 produced on a printed circuit 3, the assembly being connected to a conventional supply system 5.

La figure 2 représente une vue, du côté du rayonnement émis, d'une source rayonnante 1 conforme à l'invention.FIG. 2 represents a view, from the side of the emitted radiation, of a radiating source 1 according to the invention.

Elle comporte une cavité 1 métallique cylindrique, ouverte du côté de l'émission du rayonnement. L'ouverture de la cavité 1 est formée par deux plans obliques concourants symétriques par rapport au plan médian longitudinal de la cavité, normal au plan médian longitudinal comprenant les brins 4 du dipôle 2 l'intersection de ces deux plans formant ainsi deux saillies 10 diamétralement opposées. Les brins 4 du dipôle 2 rayonnant sont obtenus par photogravure sur une plaquette 3 de diélectrique. Pour des raisons de tenue mécanique, un cerclage cylindrique 7 de diélectrique est disposé à l'intérieur de la cavité cylindrique 1. Pour fixer la cavité 1 à son circuit d'alimentation, et orienter le dipôle suivant la direction de rayonnement choisie, on a pratiqué deux fentes 8 dans la partie fermée 9 de la cavité, à travers lesquelles passent deux vis 11.It comprises a cylindrical metallic cavity 1, open on the side of the emission of the radiation. The opening of the cavity 1 is formed by two concurrent oblique planes symmetrical with respect to in the longitudinal median plane of the cavity, normal to the longitudinal median plane comprising the strands 4 of the dipole 2 the intersection of these two planes thus forming two diametrically opposite projections 10. The strands 4 of the radiating dipole 2 are obtained by photoengraving on a dielectric plate 3. For reasons of mechanical strength, a cylindrical strapping 7 of dielectric is placed inside the cylindrical cavity 1. To fix the cavity 1 to its supply circuit, and orient the dipole according to the chosen radiation direction, we have made two slots 8 in the closed part 9 of the cavity, through which two screws 11 pass.

Pour réaliser un couplage quasi total avec le milieu extérieur l'impédance de la cavité est adaptée à l'impédance de l'air, permettant ainsi à la quasi totalité de l'énergie d'être rayonnée à l'extérieur.To achieve an almost total coupling with the external environment, the impedance of the cavity is adapted to the impedance of the air, thus allowing almost all of the energy to be radiated outside.

La figure 3 est une autre réalisation de l'invention, comportant un dipôle rayonnant classique 6, demi-onde ou onde entière.FIG. 3 is another embodiment of the invention, comprising a conventional radiating dipole 6, half-wave or whole wave.

Comme on l'a vu plus haut, on cherche à obtenir suivant l'invention l'élargissement de la bande de fonctionnement de la source rayonnante. Cet élargissement est obtenu d'une part grâce à une amélioration de la symétrie du diagramme de rayonnement par rapport à la direction de propagation, et d'autre part grâce à un accroissement de la directivité de ce diagramme. La symétrie du diagramme de rayonnement de la source est améliorée par l'ouverture de la cavité, cette dernière présentant deux saillies diamétralement opposées, comme on vient de le décrire. L'accroissement de la directivité est obtenu par l'adjonction d'une coiffe en diélectrique, creuse, recouvrant l'ouverture de la cavité.As seen above, it is sought to obtain, according to the invention, the widening of the operating band of the radiating source. This widening is obtained on the one hand thanks to an improvement in the symmetry of the radiation diagram with respect to the direction of propagation, and on the other hand thanks to an increase in the directivity of this diagram. The symmetry of the radiation pattern of the source is improved by the opening of the cavity, the latter having two diametrically opposite projections, as just described. The increase in directivity is obtained by the addition of a hollow dielectric cap covering the opening of the cavity.

La figure 4 représente un arraché d'une source conformément à l'invention. Elle est recouverte par une coiffe 12, en diélectrique, creuse, tronconique présentant un angle solide aigü selon le sens de propagation du rayonnement à l'émission et s'emboîtant sur les saillies 10. L'épaisseur de la coiffe décroît selon ce même sens de propagation. La cavité est alimentée en son axe de symétrie longitudinal par une ligne coaxiale 13. L'adaptation de la cavité 1 à la ligne d'alimentation 13 est réalisée par un transformateur quart d'onde et symétriseur, obtenu à partir d'une ligne coaxiale quart d'onde 14 sur le conducteur extérieur de laquelle ont été pratiquées deux épargnes 16 de métallisation. Les épargnes 16, symétriques par rapport à l'axe longitudinal de la cavité, sont comprises dans le plan normal du plan médian comprenant les brins 4 du dipôle déposé par photogravure sur une plaquette 3 de diélectrique. Le conducteur central 17 de la ligne coaxiale est un fil métallique gainé de diélectrique 18. Pour parfaire l'accord, une bague basse-impédance non représentée sur la figure peut être placée contre la paroi externe de la ligne coaxiale.Figure 4 shows a tear from a source according to the invention. It is covered by a cap 12, in dielectric, hollow, frustoconical having an acute solid angle according to the direction of propagation of the radiation on emission and fitting onto the projections 10. The thickness of the cap decreases in this same direction of propagation. The cavity is fed in its longitudinal axis of symmetry by a coaxial line 13. The adaptation of the cavity 1 to the supply line 13 is produced by a quarter-wave transformer and balun, obtained from a quarter-wave coaxial line 14 on the external conductor of which two metallization savings 16 have been made. The spares 16, symmetrical with respect to the longitudinal axis of the cavity, are included in the normal plane of the median plane comprising the strands 4 of the dipole deposited by photogravure on a dielectric plate 3. The central conductor 17 of the coaxial line is a metal wire sheathed with dielectric 18. To perfect the agreement, a low-impedance ring not shown in the figure can be placed against the external wall of the coaxial line.

La figure 5 est un arraché d'une autre source rayonnante 1 selon l'invention, d'embase 19 cylindrique diélectrique métallisée. La métallisation 21 de l'embase 19 est obtenue par photogravure. La partie basse de la coiffe 12, qui se prolonge dans l'embase de la cavité, s'emboîte dans celle-ci. L'assemblage de la coiffe diélectrique 12 avec l'embase diélectrique 19 se fait par un emboîtement 20 de la partie basse de la coiffe dans l'embase. Les brins 4 du dipôle sont déposés par photogravure sur l'embase diélectrique 19.FIG. 5 is a cutaway from another radiating source 1 according to the invention, of metallized dielectric cylindrical base 19. The metallization 21 of the base 19 is obtained by photoengraving. The lower part of the cap 12, which extends into the base of the cavity, fits into it. The assembly of the dielectric cap 12 with the dielectric base 19 is done by a fitting 20 of the lower part of the cap in the base. The strands 4 of the dipole are deposited by photoengraving on the dielectric base 19.

Ce mode de réalisation de sources avec embase diélectrique métallisée présente l'avantage d'un moindre coût surtout pour la réalisation en grand nombre de sources. Les performances électromagnétiques sont les mêmes que pour les sources à cavité métallique.This embodiment of sources with metallized dielectric base has the advantage of a lower cost, especially for producing a large number of sources. The electromagnetic performance is the same as for metal cavity sources.

La figure 6 montre un autre type de réalisation de source rayonnante à cavité avec une coiffe diélectrique 15 creuse, composée de sections cylindriques coaxiales de diamètre décroissant suivant le sens de propagation à l'émission, et de hauteurs différentes. L'épaisseur de chaque section diélectrique cylindrique décroît également selon le sens de propagation.FIG. 6 shows another type of embodiment of a radiating cavity source with a hollow dielectric cap, composed of coaxial cylindrical sections of diameter decreasing according to the direction of propagation on emission, and of different heights. The thickness of each cylindrical dielectric section also decreases according to the direction of propagation.

La figure 7 représente une autre réalisation d'une source rayonnante suivant l'invention, pour laquelle la cavité ouverte présente deux créneaux 110 opposés symétriques placés sur un diamètre perpendiculaire aux brins 4 du dipôle 2. La cavité 1 peut être réalisée en métal ou en diélectrique métallisé, comme cela a été décrit auparavant.FIG. 7 shows another embodiment of a radiating source according to the invention, for which the open cavity has two opposite symmetrical slots 110 placed on a diameter perpendicular to the strands 4 of the dipole 2. The cavity 1 can be made of metal or metallized dielectric, as described above.

Pour un exemple de réalisation d'une source rayonnante suivant l'invention, fonctionnant en bande C de fréquence soit de 5450 à 5850 MHz, on a obtenu comme dimensions moyennes ; diamètre de la cavité compris entre une à trois longueurs d'onde À suivant le type du dipôle utilisé ; hauteur d'embase égale à la demie longueur d'onde ; hauteur optimale des pointes égale à λ/5. Dans le cas d'une réalisation d'une source avec deux créneaux, fonctionnant dans le même domaine de fréquences que précédemment, la largeur des créneaux est de X/2 et la hauteur de À/10. Pour une source rayonnante fonctionnant à d'autres fréquences, ses dimensions sont obtenues par homothétie à partir des dimensions précédentes.For an exemplary embodiment of a radiating source according to the invention, operating in C band of frequency, ie from 5450 to 5850 MHz, the following dimensions were obtained; diameter of the cavity between one to three wavelengths A depending on the type of dipole used; base height equal to half wavelength; optimal height of the points equal to λ / 5. In the case of an embodiment of a source with two slots, operating in the same frequency domain as previously, the width of the slots is X / 2 and the height of λ / 10. For a radiating source operating at other frequencies, its dimensions are obtained by homothety from the previous dimensions.

Une application intéressante de ce type de source rayonnante est à noter. Celle-ci peut être avantageusement utilisée dans des antennes-réseaux particulièrement à symétrie de révolution. On obtient un accroissement de la directivité d'une antenne réseau en augmentant notamment celle des sources élémentaires qui la composent. En effet, le diagramme de rayonnement de l'antenne-réseau est obtenu en faisant le produit du diagramme de rayonnement d'une source élémentaire du réseau par la fonction de réseau.An interesting application of this type of radiant source should be noted. This can be advantageously used in antenna arrays particularly with symmetry of revolution. An increase in the directivity of a network antenna is obtained by notably increasing that of the elementary sources which compose it. Indeed, the radiation pattern of the array antenna is obtained by making the product of the radiation pattern of an elementary source of the array by the array function.

La figure 8 représente de façon schématique un exemple d'antenne-réseau où les sources élémentaires sont réalisées suivant l'invention. Elles sont disposées circulairement sur un support métallique 23. Tous les dipôles 2 sont orientés suivant la même direction qui est celle de la polarisation de l'antenne.FIG. 8 schematically represents an example of array antenna where the elementary sources are produced according to the invention. They are arranged circularly on a metal support 23. All the dipoles 2 are oriented in the same direction which is that of the polarization of the antenna.

On a ainsi décrit sous la forme de plusieurs réalisations possibles, une source rayonnante hyperfréquence à cavité ouverte excitée par un dipôle, dont les qualités de directivité et de symétrie du diagramme de rayonnement par rapport à la direction de propagation permettent une bande de fréquence de son fonctionnement .. plus large que celle des sources rayonnantes à cavité ouverte excitée par un dipôle de l'art antérieur.We have thus described in the form of several possible embodiments, a radiating microwave source with an open cavity excited by a dipole, the directivity and symmetry qualities of the radiation diagram with respect to the direction of propagation allow a frequency band of sound operation .. wider than that of radiating sources with open cavity excited by a dipole of the prior art.

Claims (19)

1. Source rayonnante à cavité cylindrique ouverte excitée par un dipôle (2) et comportant une ouverture du côté du rayonnement émis, caractérisée par le fait que l'ouverture présente deux saillies (10) s'avançant dans la direction du rayonnement émis, et opposées sur un diamètre perpendiculaire aux brins (4) du dipôle (2).1. Radiant source with open cylindrical cavity excited by a dipole (2) and comprising an opening on the side of the emitted radiation, characterized in that the opening has two projections (10) advancing in the direction of the emitted radiation, and opposite on a diameter perpendicular to the strands (4) of the dipole (2). 2. Source rayonnante selon la revendication 1, caractérisée en ce que les deux saillies (10) de la cavité (1) sont des pointes diamétralement opposées, obtenues par l'intersection de deux surfaces obliques concourantes symétriques par rapport au diamètre normal aux brins (4) du dipôle (2).2. Radiant source according to claim 1, characterized in that the two projections (10) of the cavity (1) are diametrically opposite points, obtained by the intersection of two oblique surfaces which are symmetrical with respect to the normal diameter of the strands ( 4) of the dipole (2). 3. Source rayonnante selon la revendication 2, caractérisée en ce que les deux surfaces concourantes sont des plans formant entre eux un angle dièdre aigü.3. Radiant source according to claim 2, characterized in that the two concurrent surfaces are planes forming between them an acute dihedral angle. 4. Source rayonnante selon la revendication 1, caractérisée en ce que les deux saillies (10) sont des créneaux diamétralement opposés.4. Radiant source according to claim 1, characterized in that the two projections (10) are diametrically opposite slots. 5. Source rayonnante selon l'une des revendications 1 à 4, caractérisée en ce que l'embase cylindrique de la cavité (1) est métallique.5. Radiant source according to one of claims 1 to 4, characterized in that the cylindrical base of the cavity (1) is metallic. 6. Source rayonnante selon la revendication 5, caractérisée en ce qu'à l'intérieur de l'embase cylindrique de la cavité (1) est disposé un cerclage cylindrique (7) en diélectrique.6. Radiant source according to claim 5, characterized in that inside the cylindrical base of the cavity (1) is disposed a cylindrical strapping (7) in dielectric. 7. Source rayonnante selon l'une des revendications 1 à 4, caractérisée en ce que l'embase cylindrique de la cavité (1) est en diélectrique métallisé.7. Radiant source according to one of claims 1 to 4, characterized in that the cylindrical base of the cavity (1) is in metallized dielectric. 8. Source rayonnant selon l'une des revendications 1 à 7, caractérisée en ce que l'ouverture de la cavité (1) est recouverte d'une coiffe diélectrique (12 ou 13).8. Radiant source according to one of claims 1 to 7, characterized in that the opening of the cavity (1) is covered with a dielectric cap (12 or 13). 9. Source rayonnante selon la revendication 8, caractérisée en ce que la coiffe diélectrique (12 ou 23), recouvrant l'ouverture, est creuse.9. Radiant source according to claim 8, characterized in that the dielectric cap (12 or 23), covering the opening, is hollow. 10. Source rayonnante selon la revendication 9, caractérisée par le fait que la coiffe diélectrique (12) est tronconique présentant un angle solide aigü selon le sens de propagation du rayonnement à l'émission.10. Radiant source according to claim 9, characterized in that the dielectric cap (12) is frustoconical having an acute solid angle in the direction of propagation of the radiation at the show. 11. Source rayonnante selon la revendication 10, caractérisée par le fait que l'épaisseur de la coiffe (12) décroît selon le sens de propagation du rayonnement à l'émission.11. Radiant source according to claim 10, characterized in that the thickness of the cap (12) decreases according to the direction of propagation of the radiation on emission. 12. Source rayonnante selon la revendication 9, caractérisée par le fait que la coiffe diélectrique (23) est composée de sections cylindriques coaxiales de diamètres décroissant suivant le sens de propagation à l'émission.12. Radiant source according to claim 9, characterized in that the dielectric cap (23) is composed of coaxial cylindrical sections of diameters decreasing in the direction of propagation on emission. 13. Source rayonnante suivant l'une des revendications 11 ou 12, caractérisée par le fait que l'épaisseur de chaque section cylindrique décroît suivant le sens de propagation à l'émission.13. Radiant source according to one of claims 11 or 12, characterized in that the thickness of each cylindrical section decreases according to the direction of propagation on emission. 14. Source rayonnante selon les revendications 7 et 8, caractérisée par le fait que la partie basse de la coiffe diélectrique (12) se prolonge dans l'embase de la cavité (1), l'assemblage de la coiffe (12) avec l'embase se faisant par un emboîtement (21).14. Radiant source according to claims 7 and 8, characterized in that the lower part of the dielectric cap (12) extends into the base of the cavity (1), the assembly of the cap (12) with the 'base being made by a socket (21). 15. Source rayonnante selon une des revendications 1 à 6, caractérisée en ce que le dipôle d'excitation de la cavité est un dipôle quart d'onde (2).15. Radiant source according to one of claims 1 to 6, characterized in that the excitation dipole of the cavity is a quarter wave dipole (2). 16. Source rayonnante selon une des revendications 1 à 6, caractérisée en ce que les brins (4) du dipôle (2) sont déposés par photogravure sur une plaquette diélectrique (3).16. Radiant source according to one of claims 1 to 6, characterized in that the strands (4) of the dipole (2) are deposited by photoengraving on a dielectric plate (3). 17. Source rayonnante selon la revendication 7, caractérisée par le fait que les brins (4) du dipôle (2) sont déposés par photogravure sur l'embase diélectrique.17. Radiant source according to claim 7, characterized in that the strands (4) of the dipole (2) are deposited by photoengraving on the dielectric base. 18. Source rayonnante selon une des revendications 1 à 17, caractérisée par le fait qu'elle est utilisée dans une antenne réseau, à laquelle elle est reliée par son système d'alimentation (5).18. Radiant source according to one of claims 1 to 17, characterized in that it is used in a network antenna, to which it is connected by its supply system (5). 19. Antenne réseau utilisant les sources rayonnantes conformément aux revendications 1 à 18.19. Array antenna using the radiating sources according to claims 1 to 18.
EP80400139A 1979-02-02 1980-01-29 Dipole fed open cavity antenna Expired EP0014635B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7902767A FR2448230A1 (en) 1979-02-02 1979-02-02 RADIANT SOURCE WITH OPEN CAVITY EXCITED BY A DIPOLE
FR7902767 1979-02-02

Publications (2)

Publication Number Publication Date
EP0014635A1 true EP0014635A1 (en) 1980-08-20
EP0014635B1 EP0014635B1 (en) 1983-03-09

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EP80400139A Expired EP0014635B1 (en) 1979-02-02 1980-01-29 Dipole fed open cavity antenna

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Country Link
US (1) US4313122A (en)
EP (1) EP0014635B1 (en)
DE (1) DE3062244D1 (en)
FR (1) FR2448230A1 (en)

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EP0071069A2 (en) * 1981-07-25 1983-02-09 Richard Hirschmann Radiotechnisches Werk Circularly polarised microwave antenna
FR2538624A1 (en) * 1982-12-23 1984-06-29 Thomson Csf Radiating source with open cavity and controlled polarisation and array antenna containing such sources.
EP0162506A1 (en) * 1984-04-26 1985-11-27 Koninklijke Philips Electronics N.V. Receiving arrangement for HF signals
EP0427131A2 (en) * 1989-11-07 1991-05-15 I.E.G. INDUSTRIE ELETTRONICHE GUGLIONESI S.r.l. Directive radar antenna with electromagnetic energy compression, for telecommunications
WO2018231283A1 (en) * 2017-06-15 2018-12-20 Commscope Technologies Llc Base station antennas having bottom end caps with angled connector ports

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US4878059A (en) * 1983-08-19 1989-10-31 Spatial Communications, Inc. Farfield/nearfield transmission/reception antenna
US5416498A (en) * 1986-10-21 1995-05-16 Ergonomics, Inc. Prehensile positioning computer keyboard
US5339097A (en) * 1986-10-21 1994-08-16 Grant Alan H Computer keyboard
US4897664A (en) * 1988-06-03 1990-01-30 General Dynamics Corp., Pomona Division Image plate/short backfire antenna
JP7298517B2 (en) * 2020-03-05 2023-06-27 株式会社デンソー electronic device

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GB721098A (en) * 1952-05-10 1954-12-29 Gen Electric Improvements in and relating to dual frequency radio antennae
FR1091260A (en) * 1953-01-09 1955-04-08 Gen Electric Co Ltd Horn antenna
US3381371A (en) * 1965-09-27 1968-05-07 Sanders Associates Inc Method of constructing lightweight antenna
US3534376A (en) * 1968-01-30 1970-10-13 Webb James E High impact antenna
US3781898A (en) * 1972-07-03 1973-12-25 A Holloway Spiral antenna with dielectric cover
US3778838A (en) * 1972-12-01 1973-12-11 Hughes Aircraft Co Circular symmetric beam forming apparatus
DE2542213A1 (en) * 1975-09-22 1977-03-24 Siemens Ag Snow-and-ice-proofing aerials used in a train-locating system - by enclosing them in smooth radomes made of polytetrafluorethylene

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071069A2 (en) * 1981-07-25 1983-02-09 Richard Hirschmann Radiotechnisches Werk Circularly polarised microwave antenna
EP0071069A3 (en) * 1981-07-25 1985-10-09 Richard Hirschmann Radiotechnisches Werk Circularly polarised microwave antenna
FR2538624A1 (en) * 1982-12-23 1984-06-29 Thomson Csf Radiating source with open cavity and controlled polarisation and array antenna containing such sources.
EP0162506A1 (en) * 1984-04-26 1985-11-27 Koninklijke Philips Electronics N.V. Receiving arrangement for HF signals
EP0427131A2 (en) * 1989-11-07 1991-05-15 I.E.G. INDUSTRIE ELETTRONICHE GUGLIONESI S.r.l. Directive radar antenna with electromagnetic energy compression, for telecommunications
EP0427131A3 (en) * 1989-11-07 1991-10-16 I.E.G. Industrie Elettroniche Guglionesi S.R.L. Directive radar antenna with electromagnetic energy compression, for telecommunications
WO2018231283A1 (en) * 2017-06-15 2018-12-20 Commscope Technologies Llc Base station antennas having bottom end caps with angled connector ports
US11888220B2 (en) 2017-06-15 2024-01-30 Commscope Technologies Llc Base station antennas having bottom end caps with angled connector ports

Also Published As

Publication number Publication date
FR2448230B1 (en) 1983-09-16
EP0014635B1 (en) 1983-03-09
US4313122A (en) 1982-01-26
FR2448230A1 (en) 1980-08-29
DE3062244D1 (en) 1983-04-14

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