EP0492022A1 - Wide band radio antenna with weak stationary wave rating - Google Patents

Wide band radio antenna with weak stationary wave rating Download PDF

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Publication number
EP0492022A1
EP0492022A1 EP90403773A EP90403773A EP0492022A1 EP 0492022 A1 EP0492022 A1 EP 0492022A1 EP 90403773 A EP90403773 A EP 90403773A EP 90403773 A EP90403773 A EP 90403773A EP 0492022 A1 EP0492022 A1 EP 0492022A1
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EP
European Patent Office
Prior art keywords
antenna
linear
hand
length
transmission line
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EP90403773A
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German (de)
French (fr)
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EP0492022B1 (en
Inventor
Yves Foissac
Jean Marie Demangel
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Laboratoire D'etudes Et De Recherches Chimiques Lerc Sa
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Laboratoire D'etudes Et De Recherches Chimiques Lerc Sa
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Priority to DE1990616446 priority Critical patent/DE69016446T2/en
Publication of EP0492022A1 publication Critical patent/EP0492022A1/en
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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
    • H01Q9/44—Resonant antennas with a plurality of divergent straight elements, e.g. V-dipole, X-antenna; with a plurality of elements having mutually inclined substantially straight portions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching

Definitions

  • the invention relates to a very wide band radio antenna with a low standing wave rate.
  • the invention relates to an antenna having, on the one hand, a low standing wave rate especially in the high frequency range, that is to say mainly between 3 and 30 megahertz and on the other hand a good yield on the aforementioned strip.
  • the antenna of the invention is particularly intended for mobile communication services which use high frequencies as communication frequencies.
  • antennas which are, on the one hand, light and easy to implement, that is to say essentially of small size and, on the other hand, radioelectrically efficient, c 'is to say whose standing wave rate is as low as possible considering a high efficiency.
  • the width of the frequency band in which these communication devices operate is implicitly limited to that in which the antenna can be used without drawbacks.
  • the antenna comprises a plurality of linear conductive elements, of different chosen lengths and which, on the one hand, are arranged parallel to the head of a slender support while being electrically isolated from each other and, on the other hand , have one of their ends electrically connected to a common line.
  • an antenna of this type has given excellent results in a range of frequencies between 30 and 88 megahertz.
  • the length of a monopole antenna that is to say of an antenna made up of a conductive linear element generally corresponds to a quarter of the wavelength at its lowest frequency of use of the antenna.
  • one of the linear elements of the antenna according to the above solution should have a length of 18.2 meters which is completely incompatible with the use that l 'We have considered for the antenna object of this application.
  • a result which the invention aims to obtain is a very broadband antenna which has good efficiency as well as a low standing wave rate while being of use compatible with a mobile communication device.
  • an antenna 1 is seen connected by an electrical transmission line 2 to a radio communication device 3 such as a transmitter and / or a receiver.
  • the antenna 1 conventionally comprises several linear elements 4 conductors of electricity and these elements 4 are each electrically connected to the transmission line 2 by one 40 of their ends 40, 41, which end is after said "base".
  • the antenna is studied to present a low standing wave rate and in particular a standing wave rate less than or equal to five in a very wide frequency band which extends from 3 to 30 megahertz.
  • the standing wave rate characterizes the propensity of the antennas to reflect through the transmission line the electrical energy which is applied to them via this line by a transmitting device.
  • the antenna of the invention also has an efficiency which varies significantly from 10% at the lowest frequency to 25% at the highest frequency.
  • the efficiency of an antenna characterizes its ability to disperse the effective electrical energy it has accepted from the transmitter into effective electromagnetic energy, taking into account its standing wave rate.
  • the angle A is between zero and thirty degrees inclusive.
  • the resistive means 5 have from one linear element to another all substantially the same Rchoisie value.
  • each linear element comprises a resistant means 5 and this is located substantially at a third of the length of the element measured from its end 40 called the base which is associated with the line 2.
  • each linear element comprises two resistant means 5 and these means are located approximately one third to two thirds, the other one third to the length of the element measured from its end called base 40.
  • each linear element comprises a resistant means 5 and this is located at substantially two thirds of the length of the element measured from its end 40 called the base which is associated with the line 2.
  • the antenna comprises three divergent linear elements 1 situated in planes radially oriented around the median axis 42 of the antenna and offset between them by approximately 120 degrees.
  • each linear element forms an angle A of approximately 18 ° with the median axis 42 of the antenna.
  • the median axis of the antenna will advantageously be oriented vertically and the antenna will in turn be oriented so that its elements diverge towards the sky.
  • the antenna makes it possible to obtain the expected results.
  • each inductive means 5 is at least in the immediate vicinity of the base 40 of a linear element 4.
  • the inductive means may consist of a winding of conductive wire directly produced on the support of the linear element (which support has not been shown any more than the winding).

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Abstract

The invention relates to a very wide band radio antenna with low voltage standing-wave ratio. It is characterised in that it comprises at least two linear elements which, in combination, on the one hand, are substantially of equal length (L) and form, with the median axis (42) of the antenna, a predetermined angle (A) whose vertex is, when the angle (A) differs from zero degrees, a point (P) near those of their ends (40, 41) which are termed bases (40), namely those which are connected electrically to the transmission line (2), and on the other hand, each include: - at least one electrically resistant means (5) interposed between two predetermined fractions of each element and, - at least one electrically inductive means (6) which, for its part, is interposed substantially between the base (40) of each element and the transmission line (2), these inductive means (6) having chosen inductance values which differ from one linear element to the next. Application to the electrical transmission hardware industry.

Description

L'invention se rapporte à une antenne radioélectrique à très large bande et à faible taux d'onde stationnaire.The invention relates to a very wide band radio antenna with a low standing wave rate.

Plus particulièrement mais non exclusivement l'invention concerne une antenne présentant, d'une part, un faible taux d'onde stationnaire spécialement dans le domaine des hautes fréquences c'est à dire principalement entre 3 et 30 mégahertz et d'autre part un bon rendement sur la bande précitée.More particularly but not exclusively, the invention relates to an antenna having, on the one hand, a low standing wave rate especially in the high frequency range, that is to say mainly between 3 and 30 megahertz and on the other hand a good yield on the aforementioned strip.

On reviendra plus aprés sur ces caractéristiques du taux d'onde stationnaire et de rendement mais on précise qu elles caractérisent essentiellement l'aptitude d'une antenne à disperser effectivement en énergie électromagnétique l'énergie électrique qui lui a été appliquée.We will come back later to these characteristics of the standing wave rate and efficiency but it should be pointed out that they essentially characterize the ability of an antenna to effectively disperse the electromagnetic energy applied to it into electromagnetic energy.

L'antenne de l'invention est particulièrement destinée aux services de communication mobile qui utilisent les hautes fréquences comme fréquences de communication.The antenna of the invention is particularly intended for mobile communication services which use high frequencies as communication frequencies.

Dans ce domaine des transmissions radioélectriques, il est nécessaire de disposer d'antennes qui sont, d'une part, légères et faciles à mettre en oeuvre c'est à dire essentiellement de faible encombrement et, d'autre part, radioélectriquement performantes, c'est à dire dont le taux d'onde stationnaire est le plus faible possible en considérant un fort rendement.In this field of radio transmissions, it is necessary to have antennas which are, on the one hand, light and easy to implement, that is to say essentially of small size and, on the other hand, radioelectrically efficient, c 'is to say whose standing wave rate is as low as possible considering a high efficiency.

Actuellement, on sait réaliser des antennes à fort rendement et dont le taux d'onde stationnaire est faible mais ce uniquement dans une bande de fréquences très étroite.Currently, it is known to make antennas with high efficiency and whose standing wave rate is low, but only in a very narrow frequency band.

Pour pouvoir couvrir une large bande de fréquences, il est connu de scinder la bande en domaines successifs et d'utiliser une antenne spécifique à chaque domaine selon la fréquence de communication.In order to be able to cover a wide frequency band, it is known to divide the band into successive domains and to use an antenna specific to each domain according to the communication frequency.

Egalement, il est connu de n'utiliser qu'une seule antenne mais de la réadapter et/ou de la réaccorder électroniquement pour qu'elle présente des caractéristiques radioélectriques acceptables à la fréquence de communication choisie.Also, it is known to use only one antenna but to readjust it and / or to retune it electronically so that it has acceptable radioelectric characteristics at the chosen communication frequency.

Ces manipulations de changement d'antennes et/ou de réaccordement peuvent bien entendu être automatisées.These manipulations of antenna change and / or retuning can of course be automated.

Elles s'avèrent quoiqu'il en soit incompatibles avec une nouvelle technique de communication qui tend à se développer et consiste à mettre en oeuvre des dispositifs émetteur et récepteur qui, en synchronisme changent rapidement et fréquemment leur fréquence de fonctionnement.However, they turn out to be incompatible with a new communication technique which is tending to develop and consists in using transmitter and receiver devices which, in synchronism, rapidly and frequently change their operating frequency.

On conçoit l'intérêt de cette technique pour les communications confidentielles.We can understand the interest of this technique for confidential communications.

Toutefois, la largeur de la bande de fréquences dans laquelle opèrent ces dispositifs de communication est implicitement limitée à celle dans laquelle l'antenne peut être utilisée sans inconvénients.However, the width of the frequency band in which these communication devices operate is implicitly limited to that in which the antenna can be used without drawbacks.

Cependant, on est récemment parvenu à étendre la largeur de la bande utile d'une antenne particulièrement dans le domaine des trés hautes fréquences c'est à dire par exemple entre 30 et 90 mégahertz.However, it has recently been possible to extend the width of the useful band of an antenna, particularly in the field of very high frequencies, that is to say for example between 30 and 90 megahertz.

Notamment, l'une des solutions adoptées est décrite dans le brevet US-A-4.302.760 et réside essentiellement dans la construction de l'antenne.In particular, one of the solutions adopted is described in patent US-A-4,302,760 and essentially resides in the construction of the antenna.

Précisément, l'antenne comprend une pluralité d'éléments linéaires conducteurs, de longueurs choisies différentes et qui, d'une part, sont disposés parallélement en tête d'un support longiligne en étant électriquement isolés les uns des autres et, d'autre part, ont l'une de leurs extrémités électriquement reliées à une ligne commune.Specifically, the antenna comprises a plurality of linear conductive elements, of different chosen lengths and which, on the one hand, are arranged parallel to the head of a slender support while being electrically isolated from each other and, on the other hand , have one of their ends electrically connected to a common line.

D'aprés les titulaires du brevet précité, une antenne de ce type a donné d'excellents résultats dans une gamme de fréquences comprises entre 30 et 88 mégahertz.According to the holders of the aforementioned patent, an antenna of this type has given excellent results in a range of frequencies between 30 and 88 megahertz.

Malheureusement, cette solution n'a pu être exploitée avec succés dans le domaine des communications à haute fréquence c'est à dire en dessous de 30 mégahertz.Unfortunately, this solution could not be successfully exploited in the field of high frequency communications, that is to say below 30 megahertz.

En effet, de manière connue, la longueur d'une antenne monopole c'est à dire d' une antenne constituée d'un élément linéaire conducteur correspond en règle générale au quart de la longueur d'ondes à sa fréquence la plus basse d'utilisation de l'antenne.In fact, in known manner, the length of a monopole antenna, that is to say of an antenna made up of a conductive linear element generally corresponds to a quarter of the wavelength at its lowest frequency of use of the antenna.

Précisément pour couvrir une bande de fréquences situées au dessus de 3 mégahertz, l'un des éléments linéaires de l'antenne selon la solution précitée devrait avoir une longueur de 18,2 mètres ce qui est tout à fait incompatible avec l'usage que l'on a envisagé pour l'antenne objet de la présente demande.Precisely to cover a frequency band located above 3 megahertz, one of the linear elements of the antenna according to the above solution should have a length of 18.2 meters which is completely incompatible with the use that l 'We have considered for the antenna object of this application.

Dans le domaine des hautes fréquences, une autre solution a été adoptée par les techniciens ; elle est décrite dans le brevet FR-A-2.597.266.In the high frequency domain, another solution was adopted by the technicians; it is described in patent FR-A-2,597,266.

Elle conduit à réduire le rapport d'amplitudes de tensions essentiellement pour les fréquences les plus basses de la bande de fréquences à couvrir et ce en interposant des moyens électriquement résistants entre l'antenne et la ligne de transmission à laquelle elle est connectée.It leads to a reduction in the voltage amplitude ratio essentially for the lowest frequencies of the frequency band to be covered, by interposing electrically resistant means between the antenna and the transmission line to which it is connected.

Toutefois, cette solution ne donne de bons résultats que pour une bande de fréquences assez peu étendue c'est à dire notamment lorsque le rapport entre la fréquence la plus haute et la fréquence la plus basse de la bande est de trois.However, this solution gives good results only for a relatively small frequency band, that is to say in particular when the ratio between the highest frequency and the lowest frequency of the band is three.

D'ailleurs, si l'on cherchait à appliquer cette solution unique à une antenne de trés large bande par exemple une bande dont le rapport entre la fréquence la plus haute et la fréquence la plus basse est de 10 , on pourrait obtenir un faible rapport d'amplitudes de tension mais le rendement de l'antenne serait également trés faible.Moreover, if we sought to apply this unique solution to a very wide band antenna, for example a band whose ratio between the highest frequency and the lowest frequency is 10, we could obtain a low ratio voltage amplitudes but the antenna efficiency would also be very low.

Un résultat que l'invention vise à obtenir est une antenne de trés large bande qui présente un bon rendement ainsi qu'un faible taux d'onde stationnaire tout en étant d'une utilisation compatible avec un dispositif mobile de communication.A result which the invention aims to obtain is a very broadband antenna which has good efficiency as well as a low standing wave rate while being of use compatible with a mobile communication device.

A cet effet, l'invention a pour objet une antenne du type précité notamment caractérisée en ce qu'elle comprend au moins deux éléments linéaires qui, en combinaison, d'une part, sont sensiblement de même longueur et forment avec l'axe médian de l'antenne un angle prédéterminé dont le sommet est, lorsque l'angle diffère de zéro degré, un point voisin de celles dites bases de leurs extrémités à savoir celles qui sont électriquement reliées à la ligne de transmission, et d'autre part, comportent chacun :

  • au moins un moyen électriquement résistant interposé entre deux fractions prédéterminées de chaque élément et,
  • au moins un moyen électriquement inductif quant à lui interposé sensiblement entre la base de chaque élément et la ligne de transmission, ces moyens inductifs ayant des valeurs d'inductance choisies qui sont différentes d'un élément linéaire à un autre.
To this end, the subject of the invention is an antenna of the aforementioned type, in particular characterized in that it comprises at least two linear elements which, in combination, on the one hand, are substantially the same length and form with the median axis of the antenna a predetermined angle whose apex is, when the angle differs from zero degrees, a point close to those called bases of their ends, namely those which are electrically connected to the transmission line, and on the other hand, each include:
  • at least one electrically resistant means interposed between two predetermined fractions of each element and,
  • at least one electrically inductive means meanwhile interposed substantially between the base of each element and the transmission line, these inductive means having chosen inductance values which are different from one linear element to another.

L'invention sera bien comprise à l'aide de la description ci-aprés faite à titre d'exemple non limitatif en regard du dessin ci-annexé qui représente schématiquement :

  • figure 1 : un schéma électrique simplifié de l'antenne,
  • figure 2 : le graphique de l'évolution du taux d'onde stationnaire en fonction de la fréquence,
  • figure 3 : vue en perspective, une antenne selon l'invention dans une forme préférée de réalisation.
The invention will be clearly understood with the aid of the description below given by way of nonlimiting example with regard to the attached drawing which schematically represents:
  • FIG. 1: a simplified electrical diagram of the antenna,
  • FIG. 2: the graph of the evolution of the standing wave rate as a function of the frequency,
  • Figure 3: perspective view, an antenna according to the invention in a preferred embodiment.

En se reportant au dessin, on voit une antenne 1 reliée par une ligne électrique de transmission 2 à un dispositif 3 de communication radioélectrique tel un émetteur et/ou un récepteur.Referring to the drawing, an antenna 1 is seen connected by an electrical transmission line 2 to a radio communication device 3 such as a transmitter and / or a receiver.

Tel que cela apparaît l'antenne 1 comprend classiquement plusieurs élements linéaires 4 conducteurs de l'électricité et ces éléments 4 sont chacun électriquement relié à la ligne de transmission 2 par l'une 40 de leurs extrémités 40, 41, laquelle extrémité est ci-après dite "base".As it appears, the antenna 1 conventionally comprises several linear elements 4 conductors of electricity and these elements 4 are each electrically connected to the transmission line 2 by one 40 of their ends 40, 41, which end is after said "base".

Tel que cela apparaît en figure 2, l'antenne est étudiée pour présenter un faible taux d'onde stationnaire et notamment un taux d'onde stationnaire inférieur ou égal à cinq dans une trés large bande de fréquence qui s'étend d'ailleurs de 3 à 30 mégahertz.As shown in Figure 2, the antenna is studied to present a low standing wave rate and in particular a standing wave rate less than or equal to five in a very wide frequency band which extends from 3 to 30 megahertz.

On précise que le taux d'onde stationnaire caractérise la propension qu'ont les antennes à réfléchir à travers la ligne de transmission l'énergie électrique qui leur est appliquée via cette ligne par un dispositif émetteur.It is specified that the standing wave rate characterizes the propensity of the antennas to reflect through the transmission line the electrical energy which is applied to them via this line by a transmitting device.

L'antenne de l'invention a en outre un rendement qui évolue sensiblement de 10 % à la fréquence la plus basse à 25 % à la fréquence la plus haute.The antenna of the invention also has an efficiency which varies significantly from 10% at the lowest frequency to 25% at the highest frequency.

On précise également que le rendement d'une antenne caractérise son aptitude à disperser en énergie électromagnétique effective l'énergie électrique qu'elle a acceptée de l'émetteur compte tenu de son taux d'onde stationnaire.It is also specified that the efficiency of an antenna characterizes its ability to disperse the effective electrical energy it has accepted from the transmitter into effective electromagnetic energy, taking into account its standing wave rate.

Conformément à l'invention, l'antenne 1 est particulière en ce qu'elle comprend au moins deux éléments linéaires 4 qui, en combinaison, d'une part, sont sensiblement de même longueur L et forment avec l'axe médian 42 de l'antenne un angle prédéterminé A dont le sommet est, lorsque l'angle A diffère de zéro degré, un point P voisin de celles dites bases 40 de leurs extrémités 40, 41, à savoir celles qui sont électriquement reliées à la ligne de transmission 2, et d'autre part, comportent chacun :

  • du moins un moyen 5 électriquement résistant interposé entre deux fractions prédéterminées de chaque élément et,
  • au moins un moyen 6 électriquement inductif quant à lui interposé sensiblement entre la base 40 de chaque élément 4 et la ligne de transmission 2, ces moyens inductifs 6 ayant des valeurs L1, L2, L3 d'inductance choisies qui sont différentes d'un élément linéaire à un autre.
According to the invention, the antenna 1 is particular in that it comprises at least two linear elements 4 which, in combination, on the one hand, are substantially of the same length L and form with the median axis 42 of l antenna a predetermined angle A whose apex is, when the angle A differs from zero degrees, a point P close to those called bases 40 of their ends 40, 41, namely those which are electrically connected to the transmission line 2 , and on the other hand, each include:
  • at least one electrically resistant means 5 interposed between two predetermined fractions of each element and,
  • at least one electrically inductive means 6 meanwhile interposed substantially between the base 40 of each element 4 and the transmission line 2, these inductive means 6 having chosen values L1, L2, L3 of inductance which are different from one element linear to another.

Selon l'invention, l'angle A est compris entre zéro et trente degrés inclus.According to the invention, the angle A is between zero and thirty degrees inclusive.

Suivant l'invention, les moyens résistants 5 ont d'un élément linéaire à un autre tous sensiblement une même valeur Rchoisie.According to the invention, the resistive means 5 have from one linear element to another all substantially the same Rchoisie value.

Dans une forme préférée de réalisation, chaque élément linéaire comprend un moyen résistant 5 et celui-ci est situé sensiblement au tiers de la longueur de l'élément mesuré à partir de son extrémité 40 dite base qui est associée à la ligne 2.In a preferred embodiment, each linear element comprises a resistant means 5 and this is located substantially at a third of the length of the element measured from its end 40 called the base which is associated with the line 2.

Dans une variante de réalisation, chaque élément linéaire comprend deux moyens 5 résistants et ces moyens sont sensiblement situés l'un au deux tiers, l'autre au tiers de la longueur de l'élément mesuré à partir de son extrémité dite base 40.In an alternative embodiment, each linear element comprises two resistant means 5 and these means are located approximately one third to two thirds, the other one third to the length of the element measured from its end called base 40.

Dans une seconde forme de réalisation, chaque élément linéaire comprend un moyen 5 résistant et celui-ci est situé au sensiblement deux tiers de la longueur de l'élément mesuré à partir de son extrémité 40 dite base qui est associée à la ligne 2.In a second embodiment, each linear element comprises a resistant means 5 and this is located at substantially two thirds of the length of the element measured from its end 40 called the base which is associated with the line 2.

Conformément à l'invention, dans une forme avantageuse de réalisation, l'antenne comprend trois éléments linéaires 1 divergeants situés dans des plans radialement orientés autour de l'axe médian 42 de l'antenne et décalés entre eux d'environ 120 degrés.According to the invention, in an advantageous embodiment, the antenna comprises three divergent linear elements 1 situated in planes radially oriented around the median axis 42 of the antenna and offset between them by approximately 120 degrees.

De préférence, chaque élément linéaire forme un angle A d'environ 18° avec l'axe médian 42 de l'antenne.Preferably, each linear element forms an angle A of approximately 18 ° with the median axis 42 of the antenna.

L'axe médian de l'antenne sera avantageusement orienté verticalement et l'antenne sera quant à elle orientée de manière que ses éléments divergent vers le ciel.The median axis of the antenna will advantageously be oriented vertically and the antenna will in turn be oriented so that its elements diverge towards the sky.

D'après l'inventeur, c'est essentiellement dans la dernière configuration qui vient d'être décrite que l'antenne permet d'obtenir les résultats escomptés.According to the inventor, it is essentially in the last configuration which has just been described that the antenna makes it possible to obtain the expected results.

Précisément en respectant les valeurs ci-aprés indiquées, on est parvenu à construire une antenne qui, composée de trois éléments linéaires chacun seulement d'une longueur d'environ sept mille neuf cents millimètres présente une bande utile de fréquence s'étendant de 3 mégahertz à 30 mégahertz avec un rendement qui évolue de 10 % à la fréquence la plus basse à 25% à la fréquence la plus haute et un rapport d'amplitude de tension inférieur à cinq sur cette bande de fréquences.Precisely by respecting the values indicated below, we managed to build an antenna which, composed of three linear elements each only of a length of about seven thousand nine hundred millimeters has a useful frequency band extending from 3 megahertz at 30 megahertz with a performance which varies from 10% at the lowest frequency to 25% at the highest frequency and a voltage amplitude ratio less than five on this frequency band.

L'antenne précitée comprend donc trois éléments linéaires disposés comme précité et comportant d'une part chacune une résistance 5 d'une valeur R de 100 ohms située sensiblement au tiers de sa longueur mesurée depuis son extrémité dite base 40 et d'autre part reliant leur extrémité dite base à la ligne de transmission :

  • un premier une inductance 6 d'une valeur L1 de 0,1 microhenry,
  • un second une inductance 6 d'une valeur L2 de 7,5 microhenry,
  • un troisième une inductance 6 d'une valeur L3 de 22 microhenry.
The above-mentioned antenna therefore comprises three linear elements arranged as above and each comprising on the one hand a resistor 5 with an R value of 100 ohms located substantially at one third of its length measured from its end called base 40 and on the other hand connecting their so-called base end to the transmission line:
  • a first an inductance 6 with a value L1 of 0.1 microhenry,
  • a second inductance 6 with an L2 value of 7.5 microhenry,
  • a third an inductance 6 with a value L3 of 22 microhenry.

Tel que cela a été représenté, chaque moyen inductif 5 est au moins à proximité immédiate de la base 40 d'un élément linéaire 4.As shown, each inductive means 5 is at least in the immediate vicinity of the base 40 of a linear element 4.

Par exemple, le moyen inductif peut être constitué par un enroulement de fil conducteur directement réalisé sur le support de l'élément linéaire (lequel support n'a pas été représenté pas plus que l'enroulement).For example, the inductive means may consist of a winding of conductive wire directly produced on the support of the linear element (which support has not been shown any more than the winding).

Dans l'exemple non limitatif de réalisation de l'antenne qui vient d'être cité, on remarque la faible longueur des éléments linéaires (inférieure à huit mètres) par rapport à la longueur de ceux d'une antenne classique du type cité dans le préambule (au moins dix huit mètres) pour la même valeur de la fréquence basse.In the nonlimiting example of embodiment of the antenna which has just been mentioned, we note the short length of the linear elements (less than eight meters) compared to the length of those of a conventional antenna of the type cited in the preamble (at least eighteen meters) for the same value of the low frequency.

Claims (7)

Antenne radioélectrique (1) comportant plusieurs éléments (4) sensiblement linéaires conducteurs de l'électricité, laquelle antenne est reliée par une ligne de transmission (2) à un dispositif de communication (3) tel un dispositif émetteur et/ou récepteur,
   cette antenne étant CARACTERISEE en ce qu'elle comprend au moins deux éléments linéaires (4) qui, en combinaison, d'une part, sont sensiblement de même longueur (L) et forment avec l'axe médian (42) de l'antenne un angle prédéterminé (A) dont le sommet est, lorsque l'angle (A) diffère de zéro degré, un point (P) voisin de celles dites bases (40) de leurs extrémités (40, 41), à savoir celles qui sont électriquement reliées à la ligne de transmission (2), et d'autre part, comportent chacun : - au moins un moyen (5) électriquement résistant interposé entre deux fractions prédéterminées de chaque élément et, - au moins un moyen (6) électriquement inductif quant à lui interposé sensiblement entre la base (40) de chaque élément (4) et la ligne de transmission (2), ces moyens inductifs (6) ayant des valeurs (L1, L2, L3) d'inductance choisies qui sont différentes d'un élément linéaire à un autre. Radio antenna (1) comprising several substantially linear electrically conductive elements (4), which antenna is connected by a transmission line (2) to a communication device (3) such as a transmitter and / or receiver device,
this antenna being CHARACTERIZED in that it comprises at least two linear elements (4) which, in combination, on the one hand, are substantially of the same length (L) and form with the median axis (42) of the antenna a predetermined angle (A) whose apex is, when the angle (A) differs from zero degrees, a point (P) close to those called bases (40) of their ends (40, 41), namely those which are electrically connected to the transmission line (2), and on the other hand, each include: - at least one electrically resistant means (5) interposed between two predetermined fractions of each element and, - at least one electrically inductive means (6) meanwhile interposed substantially between the base (40) of each element (4) and the transmission line (2), these inductive means (6) having values (L1, L2, L3) of chosen inductance which are different from one linear element to another. Antenne selon la revendication 1 caractérisée en ce que: - d'une part, elle comprend trois éléments linéaires (1) divergeants situés dans des plans radialment orientés autour de l'axe médian (42) de l'antenne et décalés entre eux d'environ 120 degrés et, - d'autre part, chaque élément linéaire forme un angle d'environ 18° avec l'axe médian (40) de l'antenne. Antenna according to claim 1 characterized in that: on the one hand, it comprises three divergent linear elements (1) located in planes radially oriented around the median axis (42) of the antenna and offset between them by approximately 120 degrees and, - On the other hand, each linear element forms an angle of about 18 ° with the median axis (40) of the antenna. Antenne selon la revendication 1 ou 2 caractérisée en ce que les moyens résistants (5) ont d'un élément linéaire à un autre tous sensiblement une même valeur (R) choisie.Antenna according to claim 1 or 2 characterized in that the resistive means (5) have from one linear element to another all substantially the same value (R) chosen. Antenne selon la revendication 2 caractérisée en ce que chaque élément linéaire comprend un moyen résistant (5) et celui-ci est situé sensiblement au tiers de la longueur de l'élément mesuré à partir de son extrémité (40) dite base qui est associée à la ligne (2).Antenna according to claim 2 characterized in that each linear element comprises a resistant means (5) and this is located substantially at one third of the length of the element measured from its end (40) called base which is associated with line (2). Antenne selon la revendication 2 caractérisée en ce que chaque élément linéaire comprend un moyen (5) résistant et celui-ci est situé au sensiblement deux tiers de la longueur de l'élément mesuré à partir de son extrémité (40) dite base qui est associée à la ligne (2).Antenna according to claim 2 characterized in that each linear element comprises a means (5) resistant and this is located at substantially two thirds of the length of the element measured from its end (40) said base which is associated on line (2). Antenne selon l'une quelconque des revendications 1 à 5 caractérisée en ce qu'elle comprend trois éléments linéaires chacun d' un longueur d'environ sept mille neuf cents millimètres disposés comme précité et comportant d'une part chacune une résistance (5) d'une valeur (R) de 100 ohms située sensiblement au tiers de sa longueur mesurée depuis son extrémité dite base (40) et d'autre part reliant leur extrémité dite base à la ligne de transmission: - un premier une inductance (6) d'une valeur (L1) de 0,1 microhenry, - un second une inductance (6) d'une valeur (L2) de 7,5 microhenry, - un troisième une inductance (6) d'une valeur (L3) de 22 microhenry. Antenna according to any one of claims 1 to 5 characterized in that it comprises three linear elements each with a length of approximately seven thousand nine hundred millimeters arranged as above and each comprising on the one hand a resistor (5) d '' a value (R) of 100 ohms located substantially at a third of its length measured from its so-called base end (40) and on the other hand connecting their so-called base end to the transmission line: - a first an inductance (6) with a value (L1) of 0.1 microhenry, - a second an inductance (6) with a value (L2) of 7.5 microhenry, - a third an inductance (6) with a value (L3) of 22 microhenry. Antenne selon l'une quelconque des revendications 1 à 6 caractérisée en ce que chaque élément linéaire comprend deux moyens (5) résistants et ces moyens sont sensiblement situés l'un au deux tiers, l'autre au tiers de la longueur de l'élément mesuré à partir de son extrémité dite base (40).Antenna according to any one of claims 1 to 6 characterized in that each linear element comprises two resistant means (5) and these means are located substantially one in two thirds, the other in one third of the length of the element measured from its so-called base end (40).
EP90403773A 1988-05-16 1990-12-26 Wide band radio antenna with weak stationary wave rating Expired - Lifetime EP0492022B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1990616446 DE69016446T2 (en) 1990-12-26 1990-12-26 Broadband radio antenna with a small standing wave ratio.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8806899A FR2650441B1 (en) 1988-05-16 1988-05-16 VERY BROADBAND RADIO ANTENNA WITH LOW STATIONARY WAVE RATE
CA002033621A CA2033621C (en) 1988-05-16 1991-01-04 Low standing wave ratio very wide band radio antenna

Publications (2)

Publication Number Publication Date
EP0492022A1 true EP0492022A1 (en) 1992-07-01
EP0492022B1 EP0492022B1 (en) 1995-01-25

Family

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Application Number Title Priority Date Filing Date
EP90403773A Expired - Lifetime EP0492022B1 (en) 1988-05-16 1990-12-26 Wide band radio antenna with weak stationary wave rating

Country Status (3)

Country Link
EP (1) EP0492022B1 (en)
CA (1) CA2033621C (en)
FR (1) FR2650441B1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0825675A2 (en) * 1996-08-19 1998-02-25 EMC Test Systems, L.P. Broad band shaped element dipole antenna
WO2002091519A1 (en) * 2001-05-08 2002-11-14 Northrop Grumman Corporation Radiator components that serve to transmit information over frequencies in range with one or more octaves less than or equal to thirty megahertz
WO2013026943A1 (en) * 2011-08-22 2013-02-28 Garcia Camacho Juan Carlos Portable dtv antenna
ES2534951A1 (en) * 2015-02-11 2015-04-30 Juan Carlos GARCÍA CAMACHO Portable dtt antenna (Machine-translation by Google Translate, not legally binding)
EP3972053A4 (en) * 2019-06-13 2022-05-25 Mitsubishi Electric Corporation Antenna device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB529152A (en) * 1938-05-24 1940-11-14 Telefunken Gmbh Improvements in or relating to radio aerial arrangements
GB685236A (en) * 1950-09-04 1952-12-31 G S V Marine & Commercial Ltd Improvements in and relating to aerials and their construction
DE3046255A1 (en) * 1979-12-09 1981-10-08 David Kiryat Chaim Grimberg BROADBAND AERIAL SMALL DIMENSIONS FOR THE RADIO FREQUENCY BAND

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB529152A (en) * 1938-05-24 1940-11-14 Telefunken Gmbh Improvements in or relating to radio aerial arrangements
GB685236A (en) * 1950-09-04 1952-12-31 G S V Marine & Commercial Ltd Improvements in and relating to aerials and their construction
DE3046255A1 (en) * 1979-12-09 1981-10-08 David Kiryat Chaim Grimberg BROADBAND AERIAL SMALL DIMENSIONS FOR THE RADIO FREQUENCY BAND

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0825675A2 (en) * 1996-08-19 1998-02-25 EMC Test Systems, L.P. Broad band shaped element dipole antenna
EP0825675A3 (en) * 1996-08-19 2000-04-05 EMC Test Systems, L.P. Broad band shaped element dipole antenna
WO2002091519A1 (en) * 2001-05-08 2002-11-14 Northrop Grumman Corporation Radiator components that serve to transmit information over frequencies in range with one or more octaves less than or equal to thirty megahertz
US6570544B2 (en) 2001-05-08 2003-05-27 Litton Systems, Inc. Radiator components that serve to transmit information over frequencies in range with one or more octaves less than or equal to thirty megahertz and that comprise major dimension less than or equal to nine meters
GB2392783A (en) * 2001-05-08 2004-03-10 Northrop Grumman Corp Radiator components that serve to transmit information over frequencies in range with one or more octaves less than or equal to thirty megahertz
GB2392783B (en) * 2001-05-08 2005-12-14 Northrop Grumman Corp Broadband antenna system
WO2013026943A1 (en) * 2011-08-22 2013-02-28 Garcia Camacho Juan Carlos Portable dtv antenna
ES2534951A1 (en) * 2015-02-11 2015-04-30 Juan Carlos GARCÍA CAMACHO Portable dtt antenna (Machine-translation by Google Translate, not legally binding)
WO2016128599A1 (en) * 2015-02-11 2016-08-18 Garcia Camacho Juan Carlos Portable dtt antenna
EP3972053A4 (en) * 2019-06-13 2022-05-25 Mitsubishi Electric Corporation Antenna device

Also Published As

Publication number Publication date
FR2650441B1 (en) 1991-11-29
EP0492022B1 (en) 1995-01-25
CA2033621A1 (en) 1992-07-05
CA2033621C (en) 1994-09-13
FR2650441A1 (en) 1991-02-01

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