EP2466684B1 - Diversity antenna system - Google Patents

Diversity antenna system Download PDF

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Publication number
EP2466684B1
EP2466684B1 EP11193170.5A EP11193170A EP2466684B1 EP 2466684 B1 EP2466684 B1 EP 2466684B1 EP 11193170 A EP11193170 A EP 11193170A EP 2466684 B1 EP2466684 B1 EP 2466684B1
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EP
European Patent Office
Prior art keywords
ground plane
antenna system
radiating elements
neutralization line
antenna
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EP11193170.5A
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German (de)
French (fr)
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EP2466684A1 (en
Inventor
Aliou Diallo
Philippe Le Thuc
Cyril Luxey
Marcio Silva-Pimenta
Robert Staraj
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Centre National de la Recherche Scientifique CNRS
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Centre National de la Recherche Scientifique CNRS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element

Definitions

  • the present invention relates to a diversity antenna system.
  • the invention relates to such an antenna system which comprises ground plane means, on which are disposed at least two radiating elements and an inter-element decoupling neutralization line.
  • the invention is concerned with the reduction of the electromagnetic coupling which naturally exists between two radiating elements placed on the same support, which makes it possible to improve the performance of multi-antenna systems in MIMO for "Multiple Input-Multiple Output”. Still called for multiple entries and exits or diversity.
  • neutralization This technique is called neutralization and the corresponding line is called the neutralization line.
  • the object of the invention is therefore to solve these problems.
  • US 1 708 944 A describes a system for neutralizing the capacitive coupling effects between two antennas operating at different frequencies f1 and f2 by interposing, at the foot of each antenna, a first resonant circuit having a resonance with f1 and a second anti-resonant circuit having a resonance at f2 in order to cancel the currents flowing between the antennas at these frequencies.
  • US 2009/027286 A1 is intended to improve the insulation between antenna elements mounted on a printed circuit board.
  • the printed circuit comprises a metal layer covered with a dielectric layer.
  • two paths are offered to the current flowing from one antenna to another, the difference in the electrical lengths of these paths being maintained at half the operating wavelength of the antennas to eliminate the couplings.
  • EP 1 777 773 A1 discloses a circuit whose capacity can be adjusted
  • the subject of the invention is an antenna system as defined in claim 1.
  • a diversity antenna system which is designated by the general reference 1 and which comprises ground plane means designated by the general reference 2 on which are disposed at least two radiating elements designated by the references 3 and 4.
  • These radiating elements are for example two antennas of PIFA type of conventional type.
  • Each of these antennas is then associated with a power supply line such as the line designated by the general reference 5 for the antenna 3 and by the general reference 6 for the antenna 4.
  • Each antenna is also connected to a connection line to the ground plane, also called a short-circuit line, designated by the general reference 7 for the antenna 3 and by the general reference 8, for the antenna 6.
  • An inter-element decoupling neutralization line is also illustrated in this figure and is designated by the general reference 9.
  • this neutralization line can be associated as illustrated in the supply lines of the radiating elements or to the connection lines to the ground plane thereof.
  • this neutralization line 9 is suspended between the radiating elements 3 and 4.
  • this neutralization line can be integrated in the ground plane, or formed partly by the ground plane to which are connected conductive elements connected to the radiating elements and in part by these conductive elements.
  • the neutralization line is associated with at least one active component having at least one controllable impedance characteristic for controlling the inter-decoupling frequency. -Elements.
  • this neutralization line is associated with an active component having at least one controllable impedance characteristic for controlling the inter-element decoupling frequency.
  • This active component is designated by the general reference 10 on this figure 3 and is formed by a Varicap diode.
  • this active component may be envisaged, the latter having to have at least one impedance characteristic that can be controlled, for example in voltage or current.
  • an active component has been integrated in this neutralization line, of which at least one of the electrical properties can be controlled for example by a DC voltage.
  • a neutralization line as defined in the state of the art, connected between two points of two radiating elements makes it possible, when it is passive, to reduce the coupling observed between accesses for a given frequency band.
  • the active component used is a Varicap diode.
  • This component has the property to present between its terminals, a variable capacitance whose value can be fixed by a DC voltage applied in reverse, the diode must remain blocked.
  • the neutralization line previously described as being suspended may for example also be printed on a thin substrate.
  • the control bias voltage of the diode can be supplied by one of the supply lines also serving as a power supply. Antenna power supply in RF radio frequency.
  • the other polarization point is ensured by the connection of the diode to the ground plane, that is to say for example to the printed circuit board.
  • the figure 4 illustrates the feasibility of this structure.
  • the technique of the conventional neutralization line generally makes it possible simultaneously to obtain good reflection coefficients for a band of frequency in which the isolation coefficients are also optimized as previously described.
  • the reflection coefficient on access 1 is S11.
  • S22 is the coefficient that can be read on input 2. This is theoretically identical to S11 in a symmetric structure, so it is not usually presented.
  • this technique can be applied to radiating elements that are already initially broad bands and therefore capable of absorbing these variations.
  • the insulation cavity visible on the figure 4 , is controlled in the UMTS band and makes it possible to obtain very good performances on the parameter S21 for the chosen frequency.
  • the parameter S11 is not optimized on the same frequency values because its variation is slower depending on the capacity. But over the entire UMTS band chosen, it remains below the value of -7 dB which is a value generally considered critical in applications such as mobile telephony.

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Description

La présente invention concerne un système d'antenne en diversité.The present invention relates to a diversity antenna system.

Plus particulièrement, l'invention se rapporte à un tel système d'antenne qui comporte des moyens formant plan de masse, sur lesquels sont disposés au moins deux éléments rayonnants et une ligne de neutralisation de découplage inter-éléments.More particularly, the invention relates to such an antenna system which comprises ground plane means, on which are disposed at least two radiating elements and an inter-element decoupling neutralization line.

En fait, l'invention s'intéresse à la réduction du couplage électromagnétique qui existe naturellement entre deux éléments rayonnants placés sur un même support, ce qui permet d'améliorer les performances des systèmes multi-antennes en MIMO pour « Multiple Input-Multiple Output » encore appelés à entrées et sorties multiples ou en diversité.In fact, the invention is concerned with the reduction of the electromagnetic coupling which naturally exists between two radiating elements placed on the same support, which makes it possible to improve the performance of multi-antenna systems in MIMO for "Multiple Input-Multiple Output". Still called for multiple entries and exits or diversity.

Il a déjà été proposé une solution permettant la réduction du couplage électromagnétique, qui consiste à placer une ligne métallique suspendue entre deux éléments rayonnants de type PIFA pour « Planar Inverted Folded Antenna » (antenne quart d'onde court-circuitée), soit entre les lignes d'alimentation de ceux-ci, soit entre les lignes de raccordement de ceux-ci au plan de masse.It has already been proposed a solution for reducing the electromagnetic coupling, which consists in placing a metallic line suspended between two PIFA-type radiating elements for "Planar Inverted Folded Antenna" (short-circuited quarter-wave antenna), or between supply lines thereof, or between the connection lines thereof to the ground plane.

Cette technique est appelée neutralisation et la ligne correspondante est appelée ligne de neutralisation.This technique is called neutralization and the corresponding line is called the neutralization line.

On a en effet constaté une amélioration de l'isolation entre les ports d'alimentation en mettant en oeuvre cette technique ce qui entraîne une bonne efficacité totale, un bon gain de diversité et une amélioration du débit dans le cas d'un système MIMO.There has indeed been an improvement in the isolation between the power ports by implementing this technique which results in a good total efficiency, a good diversity gain and an improvement in the rate in the case of a MIMO system.

Cependant les effets d'une telle ligne de neutralisation de découplage inter-éléments restent pour l'instant limités.However, the effects of such an inter-element decoupling neutralization line remain for the moment limited.

Le but de l'invention est donc de résoudre ces problèmes.The object of the invention is therefore to solve these problems.

L'article Diallo A et al. "MIMO performance of enhanced UMTS four-antenna structures for mobile phones in the presence of the user's head", ANTENNAS AND PROPAGATION INTERNATIONAL SYMPOSIUM, 2007 IEEE, IEEE, PISCATAWAY, NJ, USA, 1 juin 2007 (2007-06-01) pages 2853 - 2856 , décrit un système d'antennes MIMO comprenant deux antennes, montées sur un même substrat (intégrant un plan de masse), et une ligne de neutralisation suspendue entre ces antennes et connectant entre eux les points d'alimentation de chacune de ces antennes.Article Diallo A et al. "MIMO performance of enhanced UMTS four-antenna structures for mobile phones in the presence of the user's head", ANTENNAS AND PROPAGATION INTERNATIONAL SYMPOSIUM, 2007 IEEE, IEEE, PISCATAWAY, NJ, USA, June 1, 2007 (2007-06-01) 2853 - 2856 , describes a MIMO antenna system comprising two antennas, mounted on the same substrate (integrating a ground plane), and a neutralization line suspended between these antennas and interconnecting the feed points of each of these antennas.

US 1 708 944 A décrit un système de neutralisation des effets de couplage capacitif entre deux antennes fonctionnant à des fréquences différentes f1 et f2 en interposant, au pied de chaque antenne, un premier circuit anti-résonant présentant une résonance à f1 et un second circuit anti-résonant présentant une résonance à f2 afin d'annuler les courants circulant entre les antennes à ces fréquences. US 1 708 944 A describes a system for neutralizing the capacitive coupling effects between two antennas operating at different frequencies f1 and f2 by interposing, at the foot of each antenna, a first resonant circuit having a resonance with f1 and a second anti-resonant circuit having a resonance at f2 in order to cancel the currents flowing between the antennas at these frequencies.

US 2009/027286 A1 vise à améliorer l'isolation entre des éléments antennaires montés sur une plaque de circuit imprimé. Le circuit imprimé comporte une couche métallique recouverte d'une couche de diélectrique. Selon ce document, deux chemins sont offerts au courant circulant d'une antenne à l'autre, la différence des longueurs électriques de ces chemins étant maintenue à la moitié de la longueur d'onde de fonctionnement des antennes pour éliminer les couplages. US 2009/027286 A1 is intended to improve the insulation between antenna elements mounted on a printed circuit board. The printed circuit comprises a metal layer covered with a dielectric layer. According to this document, two paths are offered to the current flowing from one antenna to another, the difference in the electrical lengths of these paths being maintained at half the operating wavelength of the antennas to eliminate the couplings.

EP 1 777 773 A1 divulgue un circuit dont la capacité peut être ajustée EP 1 777 773 A1 discloses a circuit whose capacity can be adjusted

A cet effet, l'invention a pour objet un système d'antenne comme défini dans la revendication 1.For this purpose, the subject of the invention is an antenna system as defined in claim 1.

Selon d'autres caractéristiques prises seules ou en combinaison :

  • la ligne de neutralisation est associée à des lignes d'alimentation des éléments rayonnants,
  • la ligne de neutralisation est associée à des lignes de raccordement au plan de masse des éléments rayonnants,
  • la ligne de neutralisation est suspendue entre les éléments rayonnants,
  • la ligne de neutralisation est intégrée dans le plan de masse,
  • la ligne de neutralisation est formée en partie par le plan de masse, auxquels sont raccordés des éléments conducteurs reliés aux éléments rayonnants et en partie par ces éléments conducteurs,
  • les moyens formant plan de masse comportent une plaque de circuit imprimé, et
  • les éléments rayonnants sont de type PIFA.
According to other characteristics taken alone or in combination:
  • the neutralization line is associated with supply lines of the radiating elements,
  • the neutralization line is associated with connection lines to the ground plane of the radiating elements,
  • the neutralization line is suspended between the radiating elements,
  • the neutralization line is integrated in the ground plane,
  • the neutralization line is formed partly by the ground plane, to which are connected conductive elements connected to the radiating elements and in part by these conductive elements,
  • the ground plane means comprise a printed circuit board, and
  • the radiating elements are of the PIFA type.

L'invention sera mieux comprise à l'aide de la description qui va suivre donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés sur lesquels :

  • la figure 1 représente un schéma synoptique illustrant l'implantation de deux antennes de type PIFA sur un plan de masse,
  • la figure 2 représente deux antennes de type PIFA avec une ligne de neutralisation de l'état de la technique,
  • la figure 3 représente deux antennes PIFA avec une ligne de neutralisation active selon l'invention,
  • la figure 4 illustre le coefficient de couplage S21 entre deux accès obtenu par simulation électromagnétique en fonction de la variation de capacité, et
  • la figure 5 représente le coefficient de réflexion S11 sur les accès en fonction de la variation de la capacité, obtenu par simulation électromagnétique.
The invention will be better understood with the aid of the following description given solely by way of example and with reference to the appended drawings in which:
  • the figure 1 represents a block diagram illustrating the implantation of two antennas of PIFA type on a ground plane,
  • the figure 2 represents two antennas of PIFA type with a neutralization line of the state of the art,
  • the figure 3 represents two PIFA antennas with an active neutralization line according to the invention,
  • the figure 4 illustrates the coupling coefficient S21 between two accesses obtained by electromagnetic simulation as a function of the capacitance variation, and
  • the figure 5 represents the reflection coefficient S11 on the accesses according to the variation of the capacitance, obtained by electromagnetic simulation.

On a en effet illustré sur la figure 1, un système d'antenne en diversité qui est désigné par la référence générale 1 et qui comporte des moyens formant plan de masse désignés par la référence générale 2 sur lesquels sont disposés au moins deux éléments rayonnants désignés par les références 3 et 4.We have indeed illustrated on the figure 1 , a diversity antenna system which is designated by the general reference 1 and which comprises ground plane means designated by the general reference 2 on which are disposed at least two radiating elements designated by the references 3 and 4.

Ces éléments rayonnants sont par exemple deux antennes de type PIFA de type classique.These radiating elements are for example two antennas of PIFA type of conventional type.

Pour améliorer les performances de ces systèmes multi-antennes on a déjà proposé d'utiliser une ligne de neutralisation de découplage inter-éléments.To improve the performance of these multi-antenna systems it has already been proposed to use an inter-element decoupling neutralization line.

Ceci est par exemple illustré sur la figure 2, sur laquelle on reconnaît le système d'antenne en diversité toujours désigné par la référence générale 1, la plaque de circuit imprimé désignée par la référence générale 2 formant plan de masse et les deux antennes de type PIFA, 3 et 4.This is for example illustrated on the figure 2 , on which is recognized the diversity antenna system always designated by the general reference 1, the printed circuit board designated by the general reference 2 forming the ground plane and the two PIFA antennas, 3 and 4.

Chacune de ces antennes est alors associée à une ligne d'alimentation telle que la ligne désignée par la référence générale 5 pour l'antenne 3 et par la référence générale 6 pour l'antenne 4.Each of these antennas is then associated with a power supply line such as the line designated by the general reference 5 for the antenna 3 and by the general reference 6 for the antenna 4.

Chaque antenne est également raccordée à une ligne de raccordement au plan de masse, également appelée ligne de court-circuit, désignée par la référence générale 7 pour l'antenne 3 et par la référence générale 8, pour l'antenne 6.Each antenna is also connected to a connection line to the ground plane, also called a short-circuit line, designated by the general reference 7 for the antenna 3 and by the general reference 8, for the antenna 6.

Une ligne de neutralisation de découplage inter-éléments est également illustrée sur cette figure et est désignée par la référence générale 9.An inter-element decoupling neutralization line is also illustrated in this figure and is designated by the general reference 9.

En fait, cette ligne de neutralisation peut être associée comme cela est illustré aux lignes d'alimentation des éléments rayonnants ou encore aux lignes de raccordement au plan de masse de ceux-ci.In fact, this neutralization line can be associated as illustrated in the supply lines of the radiating elements or to the connection lines to the ground plane thereof.

Dans l'exemple de réalisation représenté sur cette figure 2, cette ligne de neutralisation 9 est suspendue entre les éléments rayonnants 3 et 4.In the exemplary embodiment represented on this figure 2 this neutralization line 9 is suspended between the radiating elements 3 and 4.

Il va de soi bien entendu que d'autres modes de réalisation peuvent être envisagés et que cette ligne de neutralisation peut être intégrée dans le plan de masse, voire formée en partie par le plan de masse auquel sont raccordés des éléments conducteurs reliés aux éléments rayonnants et en partie par ces éléments conducteurs.It goes without saying of course that other embodiments can be envisaged and that this neutralization line can be integrated in the ground plane, or formed partly by the ground plane to which are connected conductive elements connected to the radiating elements and in part by these conductive elements.

Pour améliorer encore les performances de ces systèmes, dans le système d'antenne à diversité selon l'invention, la ligne de neutralisation est associée à au moins un composant actif présentant au moins une caractéristique d'impédance commandable pour contrôler la fréquence de découplage inter-éléments.To further improve the performance of these systems, in the diversity antenna system according to the invention, the neutralization line is associated with at least one active component having at least one controllable impedance characteristic for controlling the inter-decoupling frequency. -Elements.

Ceci est par exemple illustré sur la figure 3 où l'on reconnaît les différents éléments déjà décrits en regard de la figure 2, à savoir le système d'antenne en diversité 1, le plan de masse 2, les antennes 3 et 4 et la ligne de neutralisation 9.This is for example illustrated on the figure 3 where we recognize the different elements already described with regard to the figure 2 , namely the diversity antenna system 1, the ground plane 2, the antennas 3 and 4 and the neutralization line 9.

Selon l'invention cette ligne de neutralisation est associée à un composant actif présentant au moins une caractéristique d'impédance commandable pour contrôler la fréquence de découplage inter-éléments.According to the invention this neutralization line is associated with an active component having at least one controllable impedance characteristic for controlling the inter-element decoupling frequency.

Ce composant actif est désigné par la référence générale 10 sur cette figure 3 et est formé par une diode Varicap.This active component is designated by the general reference 10 on this figure 3 and is formed by a Varicap diode.

Bien entendu, d'autres modes de réalisation de ce composant actif peuvent être envisagés, celui-ci devant présenter au moins une caractéristique d'impédance commandable par exemple en tension ou en courant.Of course, other embodiments of this active component may be envisaged, the latter having to have at least one impedance characteristic that can be controlled, for example in voltage or current.

Ainsi, selon l'invention, on a intégré dans cette ligne de neutralisation, un composant actif dont au moins une des propriétés électriques peut être commandée par exemple par une tension continue.Thus, according to the invention, an active component has been integrated in this neutralization line, of which at least one of the electrical properties can be controlled for example by a DC voltage.

Une ligne de neutralisation, telle que définie dans l'état de la technique, connectée entre deux points de deux éléments rayonnants permet, lorsqu'elle est passive, de diminuer le couplage observé entre accès pour une bande de fréquence donnée.A neutralization line, as defined in the state of the art, connected between two points of two radiating elements makes it possible, when it is passive, to reduce the coupling observed between accesses for a given frequency band.

En insérant ou en associant un composant actif dans une telle ligne de neutralisation, on peut modifier de manière dynamique la bande de fréquence neutralisée par la ligne.By inserting or associating an active component in such a neutralization line, it is possible to dynamically modify the frequency band neutralized by the line.

Dans l'exemple de réalisation décrit, le composant actif utilisé est une diode Varicap.In the embodiment described, the active component used is a Varicap diode.

Ce composant possède la propriété de présenter entre ses bornes, une capacité variable dont la valeur peut être fixée par une tension continue appliquée en inverse, la diode devant demeurer bloquée.This component has the property to present between its terminals, a variable capacitance whose value can be fixed by a DC voltage applied in reverse, the diode must remain blocked.

Afin de rendre la réalisation plus facile, la ligne de neutralisation précédemment décrite comme étant suspendue, peut par exemple également être imprimée sur un substrat de faible épaisseur.In order to make the realization easier, the neutralization line previously described as being suspended may for example also be printed on a thin substrate.

Puisque la ligne de neutralisation relie par exemple les deux lignes d'alimentation ou de court-circuit de chacune des deux antennes décrites, la tension de polarisation de commande de la diode peut être amenée par l'une des lignes d'alimentation servant également d'alimentation aux antennes en radiofréquence RF.Since the neutralization line connects, for example, the two supply or short-circuit lines of each of the two antennas described, the control bias voltage of the diode can be supplied by one of the supply lines also serving as a power supply. Antenna power supply in RF radio frequency.

L'autre point de polarisation est assuré par la connexion de la diode au plan de masse c'est-à-dire par exemple à la plaque de circuit imprimé.The other polarization point is ensured by the connection of the diode to the ground plane, that is to say for example to the printed circuit board.

Il suffit alors de prévoir d'éventuels découplages radiofréquence/alimentation continue RF/DC, notamment du fait de la présence des lignes de court-circuit connectées initialement directement au plan de masse, par le biais de fentes annulaires pratiquées autour des points de connexion de ces lignes sur la plaque de circuit imprimé.It then suffices to provide for possible RF / DC DC / DC power decoupling, in particular because of the presence of the short-circuit lines initially connected directly to the ground plane, by means of annular slots made around the connection points of the cable. these lines on the printed circuit board.

Bien entendu, on peut également envisager de placer cette diode de manière série dans la continuité de la ligne de neutralisation, les problèmes de découplage RF/DC pouvant être résolus par les mêmes techniques que décrites précédemment.Of course, it is also conceivable to place this diode in series in the continuity of the neutralization line, the RF / DC decoupling problems can be solved by the same techniques as described above.

La figure 4 illustre la faisabilité de cette structure.The figure 4 illustrates the feasibility of this structure.

Un couplage électromagnétique important entre deux éléments rayonnants proches se traduit par une valeur généralement élevée du coefficient de transmission S21 mesuré ou simulé entre les deux accès 1 et 2.Significant electromagnetic coupling between two nearby radiating elements results in a generally high value of the measured or simulated transmission coefficient S21 between the two ports 1 and 2.

Sur la figure 4 on observe également que la ligne de neutralisation associée à la capacité variable permet d'obtenir une plongée du coefficient S21 pour des fréquences dépendant de la valeur de la capacité et donc dans l'exemple décrit, de la tension de commande de la diode Varicap correspondante intégrée dans cette ligne de neutralisation.On the figure 4 it is also observed that the neutralization line associated with the variable capacitance makes it possible to obtain a dive of the coefficient S21 for frequencies depending on the value of the capacitance and therefore in the example described, of the control voltage of the corresponding Varicap diode. integrated in this neutralization line.

En ce qui concerne l'adaptation des entrées qui se traduit par un coefficient de réflexion sur chacune des entrées, le plus faible possible, la technique de la ligne de neutralisation classique permet généralement l'obtention simultanée de bons coefficients de réflexion pour une bande de fréquence dans laquelle les coefficients d'isolation sont également optimisés comme décrits précédemment.With regard to the adaptation of the inputs, which results in a reflection coefficient on each of the inputs, as low as possible, the technique of the conventional neutralization line generally makes it possible simultaneously to obtain good reflection coefficients for a band of frequency in which the isolation coefficients are also optimized as previously described.

Le coefficient de réflexion sur l'accès 1 est S11.The reflection coefficient on access 1 is S11.

S22 est le coefficient qui peut être relevé sur l'entrée 2. Celui-ci étant en théorie identique à S11 dans le cadre d'une structure symétrique, il n'est généralement pas présenté.S22 is the coefficient that can be read on input 2. This is theoretically identical to S11 in a symmetric structure, so it is not usually presented.

Dans le cas de l'invention, basée sur l'introduction d'un composant actif dans la ligne de neutralisation, lorsque la capacité commandée modifie la fréquence pour laquelle l'isolation est optimisée, elle modifie également et dans le même sens, la fréquence pour laquelle l'adaptation est également optimisée, comme cela ressort de ces figures 4 et 5.In the case of the invention, based on the introduction of an active component into the neutralization line, when the controlled capacity changes the frequency for which the insulation is optimized, it also modifies and in the same direction, the frequency for which the adaptation is also optimized, as is apparent from these Figures 4 and 5 .

Ce double effet va donc dans le sens d'une amélioration globale de l'efficacité du système.This double effect is therefore in the sense of an overall improvement of the efficiency of the system.

Un inconvénient qui peut être noté, est que cette variation en fréquence est moins rapide pour le paramètre S11 que dans le cas du paramètre d'isolation S21.A disadvantage that can be noted is that this frequency variation is less rapid for the parameter S11 than in the case of the isolation parameter S21.

Des solutions de compensation existent cependant.Compensation solutions exist, however.

En effet, on peut appliquer cette technique sur des éléments rayonnants qui sont déjà initialement larges bandes et donc capables d'absorber ces variations.Indeed, this technique can be applied to radiating elements that are already initially broad bands and therefore capable of absorbing these variations.

C'est la solution retenue pour la structure dont les résultats sont présentés en figures 4 et 5.This is the solution chosen for the structure whose results are presented in Figures 4 and 5 .

Pour différentes valeurs de capacité, le creux d'isolation, visible sur la figure 4, est piloté dans la bande UMTS et permet d'obtenir de très bonnes performances sur le paramètre S21 pour la fréquence choisie.For different capacity values, the insulation cavity, visible on the figure 4 , is controlled in the UMTS band and makes it possible to obtain very good performances on the parameter S21 for the chosen frequency.

Le paramètre S11 n'est pas optimisé sur les mêmes valeurs de fréquence car sa variation est moins rapide en fonction de la capacité. Mais sur l'ensemble de la bande UMTS choisie, il reste sous la valeur de - 7 dB qui est une valeur généralement considérée comme critique dans les applications par exemple en téléphonie mobile.The parameter S11 is not optimized on the same frequency values because its variation is slower depending on the capacity. But over the entire UMTS band chosen, it remains below the value of -7 dB which is a value generally considered critical in applications such as mobile telephony.

On peut également accroître la vitesse de ces variations en ajoutant une seconde capacité variable de même type placée en extrémité des éléments rayonnants ou dans un emplacement même plus optimisé, et commandée par la même tension que la diode/capacité placée dans la ligne de neutralisation.It is also possible to increase the speed of these variations by adding a second variable capacitor of the same type placed at the end of the radiating elements or in a more optimized location, and controlled by the same voltage as the diode / capacitor placed in the neutralization line.

En effet, une augmentation de la charge capacitive sur les bords d'un élément rayonnant est connue pour décroître la fréquence de celle-ci.Indeed, an increase in the capacitive load on the edges of a radiating element is known to decrease the frequency thereof.

Il va de soi bien entendu que d'autres modes de réalisation encore peuvent être envisagés et que cette structure peut être appliquée par exemple à des systèmes d'antenne à diversité, multi-bandes comme par exemple penta-bandes en GSM, DCS, PCS, UMTS et WLAN.It goes without saying of course that other embodiments can be envisaged and that this structure can be applied for example to diversity antenna systems, multi-band as for example penta-bands GSM, DCS, PCS , UMTS and WLAN.

Claims (9)

  1. An antenna diversity system, of the type comprising ground plane means (2), on which are arranged at least two radiating elements (3, 4), of the RF radio-frequency antenna type, and an inter-element decoupling neutralization line (9), the neutralization line (9) incorporating at least one active component (10), characterized in that the active component comprises at least one varicap diode having at least one voltage-controllable impedance characteristic to control the inter-element decoupling frequency, the control bias voltage of the varicap diode being supplied by one of the supply lines also supplying the radiating elements, the other connection point of the diode being ensured by the connection of the varicap diode to the ground plane.
  2. Antenna system according to claim 1, characterized in that the neutralization line (9) is associated with the supply lines (5, 6) of the radiating elements (3, 4).
  3. Antenna system according to claim 1, characterized in that the neutralization line (9) is associated with connecting lines (7, 8) to the ground plane (2) of the radiating elements (3, 4).
  4. Antenna system according to any one of the preceding claims, characterized in that the neutralization line (9) is suspended between the radiating elements (3, 4).
  5. Antenna system according to any one of claims 1 to 3, characterized in that the neutralization line (9) is integrated in the ground plane (2).
  6. Antenna system according to any one of claims 1 to 3, characterized in that the neutralization line (9) is formed in part by the ground plane (2), to which are connected conductive elements linked to the radiating elements (3, 4), and in part by these conductive elements.
  7. Antenna system according to any one of the preceding claims, characterized in that it comprises RF/DC supply decoupling, due to the presence of short-circuit lines connected directly to the ground plane by means of annular slots around the connection points of the lines on the printed circuit board.
  8. Antenna system according to any one of the preceding claims, characterized in that the ground plane means (2) comprise a printed circuit board.
  9. Antenna system according to any one of the preceding claims, characterized in that the radiating elements (3, 4) are of the PIFA type.
EP11193170.5A 2010-12-14 2011-12-13 Diversity antenna system Not-in-force EP2466684B1 (en)

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FR1060498A FR2968845B1 (en) 2010-12-14 2010-12-14 DIVERSE ANTENNA SYSTEM

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TWI523324B (en) 2012-09-14 2016-02-21 宏碁股份有限公司 Communication device
CN103682626B (en) * 2012-09-20 2017-01-25 宏碁股份有限公司 Communication device
CN104701609B (en) * 2013-12-05 2018-01-05 宏碁股份有限公司 Communicator with couple feed multifrequency antenna element
WO2015144849A1 (en) * 2014-03-27 2015-10-01 Hirschmann Car Communication Gmbh Antenna system having improved decorrelation
FR3021164B1 (en) 2014-05-19 2018-05-11 Centre National De La Recherche Scientifique ANTENNA SYSTEM FOR REDUCING ELECTROMAGNETIC COUPLING BETWEEN ANTENNAS
CN108899634A (en) * 2018-06-07 2018-11-27 普联技术有限公司 A kind of IFA antenna and communication equipment
FR3084779B1 (en) 2018-08-02 2022-01-21 Commissariat Energie Atomique ANTENNA DEVICE COMPRISING AT LEAST TWO ANTENNAS WITH THE SAME ELECTRICAL CONNECTION SUBSTRATE

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US20090027286A1 (en) * 2007-07-27 2009-01-29 Kabushiki Kaisha Toshiba Antenna apparatus and wireless device

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US1708944A (en) * 1920-08-17 1929-04-16 Western Electric Co System for neutralizing capacitive reactance between two circuits placed close to each other
US7352264B2 (en) * 2005-10-24 2008-04-01 M/A-Com, Inc. Electronically tunable dielectric resonator circuits

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JP2006042111A (en) * 2004-07-29 2006-02-09 Matsushita Electric Ind Co Ltd Antenna device
US20090027286A1 (en) * 2007-07-27 2009-01-29 Kabushiki Kaisha Toshiba Antenna apparatus and wireless device

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