EP2404348A1 - Method for producing an antenna, operating in a given frequency band, from a dual-band antenna - Google Patents

Method for producing an antenna, operating in a given frequency band, from a dual-band antenna

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Publication number
EP2404348A1
EP2404348A1 EP10709901A EP10709901A EP2404348A1 EP 2404348 A1 EP2404348 A1 EP 2404348A1 EP 10709901 A EP10709901 A EP 10709901A EP 10709901 A EP10709901 A EP 10709901A EP 2404348 A1 EP2404348 A1 EP 2404348A1
Authority
EP
European Patent Office
Prior art keywords
antenna
band
dual
frequency
supply line
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
EP10709901A
Other languages
German (de)
French (fr)
Other versions
EP2404348B8 (en
EP2404348B1 (en
Inventor
Philippe Minard
Jean-François PINTOS
Jean-Yves Le Naour
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
InterDigital Madison Patent Holdings SAS
Original Assignee
Thomson Licensing SAS
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Filing date
Publication date
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Publication of EP2404348A1 publication Critical patent/EP2404348A1/en
Application granted granted Critical
Publication of EP2404348B1 publication Critical patent/EP2404348B1/en
Publication of EP2404348B8 publication Critical patent/EP2404348B8/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
    • H01Q13/085—Slot-line radiating ends
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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 present invention relates to a method of producing an antenna operating in a given frequency band from a dual-band antenna and an antenna system using said method.
  • the present invention therefore relates to a method for producing an antenna operating in a given frequency band from a dual-band or broadband antenna. Therefore, it is possible to have cards on which an antenna system can operate according to different standards and to achieve, depending on the chosen standard, a specific antenna.
  • the present invention therefore relates to a method of producing an antenna operating in a given frequency band from a dual-band antenna, the dual-band antenna being a slot-type broadband antenna receiving and / or transmitting electromagnetic signals at a first frequency and a second higher frequency, the antenna being fed by a single power supply line, characterized in that the free end of the power supply line is connected via a connecting means which can be open or closed to a means of rejection of one of the frequencies.
  • the dual-band antenna is constituted by a slot flaring at its radiating end such as a Vivaldi antenna or more generally a TSA antenna for, in English, "Tapered Slot Antenna".
  • the supply line is a microstrip line and the rejection means comprises a microstrip line section.
  • the line section is connected by a connection element forming a short-circuit at the open-circuit end of the microstrip line.
  • the present invention also relates to an antenna system comprising at least one dual-band antenna that can be transformed into an antenna operating in a given frequency band, according to the method described above. The use of this method makes it possible to have several possible configurations based on the same electronic card.
  • Figure 1 is a schematic top plan view of a dual-band antenna that can be transformed into an antenna operating in a given frequency band in accordance with the present invention.
  • Figure 2 is a schematic top plan view showing an antenna operating in a given frequency band obtained with the method of the present invention.
  • Figure 3 shows the impedance matching curve over 50
  • FIG. 4 represents the gain curve as a function of the frequency respectively of the antenna operating in a given frequency band and of the dual-band antenna
  • Figure 5 is a schematic top plan view showing a system of three antennas made according to the method of the present invention.
  • a schematic representation of a dual-band antenna capable of receiving and / or emitting electromagnetic signals at a first frequency, namely in a frequency band around 2.4 will be described first with reference to FIG. GHz and, at a second frequency, namely in the frequency band around 5 GHz.
  • the antenna shown in FIG. 1 is a flared slot antenna 1, more particularly an antenna called Vivaldi.
  • this antenna is obtained by engraving a flared slot on a substrate provided on one of its faces with a plane of mass 2 in which the slot 1 is made.
  • the slot 1 is flared at its radiating end and the slot dimensions, namely the width of the flare, the slot length and the radius of curvature, are chosen so as to have a bandwidth that includes the two 2.4 GHz and 5 GHz frequency bands corresponding to IEEE802.11 a, b and g standards.
  • the Vivaldi antenna 1 is powered by electromagnetic coupling by a power supply line 3 connected to circuits, not shown, for transmitting and receiving the electromagnetic signals.
  • This supply line 3 is constituted, in the embodiment shown, by a microstrip line 3 made on the face of the substrate opposite the metallized face 2.
  • the length L3 defines the length of the micro-ribbon line 3 'between its open-circuit end and the plane of the transition between the slot line 1 and the micro-ribbon line 3.
  • a microstrip line section 4 is formed in the extension of the free end 3 'of the feed line 3.
  • This section of microstrip line 4 has a length L4.
  • L4 is chosen such that the sum of L4 + L3 + L5 is ⁇ ⁇ g / 4 where ⁇ g corresponds to the desired rejection frequency, namely 2.4 GHz in the embodiment.
  • L5 corresponds to the electrical length of the spacing between the end 3 'of the supply line and the end of the line section 4, this spacing being intended to receive a connection element which can be open or closed, to namely a short circuit element, for a certain frequency band as explained below.
  • the other end 4 'of the line section 4 is connected via a via or connected to the ground plane.
  • the method according to the present invention will now be described which makes it possible to transform the dual-band antenna of FIG. 1 into an antenna operating solely on a frequency band around the second frequency, namely GHz in the embodiment shown.
  • the 3 'end of the microstrip line 3 is connected by an antenna element. short-circuit connection 5 to line section 4.
  • This element is a short-circuit RF which can be realized by a resistance of value OOhm or also by a capacitance dimensioned so that its impedance is quasi-zero with the frequency to be rejected, namely 2.4GHz in the embodiment represent.
  • the sum of the lengths L4, L3, L5 is substantially equal to ⁇ g / 4.
  • This set forms a rejection element for filtering the first frequency, namely 2.4 GHz and, as a result, the Vivaldi antenna operates as a single-band antenna at 5 GHz.
  • FIGS. 1 and 2 have been simulated using electromagnetic software based on the method of moments.
  • Figure 3 shows the impedance matching curve on
  • the antenna operating in a given frequency band has an adaptation better than -15 dB in the 5GHz frequency band whereas its adaptation in the 2.4GHz frequency band is only of -0.85dB.
  • the antenna operating in a given frequency band is well mismatched in the 2.4GHz band.
  • the dual-band / broadband antenna is correctly adapted in both the 2.4 and 5 GHz frequency bands with respectively a better level than -13 dB and -15 dB.
  • FIG. 4 represents the curve giving the maximum gain as a function of the frequency of the antenna operating in a given frequency band and of the dual-band antenna simulated with the same software as previously. Reading these two curves, we see that the gain of the antenna operating in a given frequency band is positive in the 5GHz band, as it collapses in the 2.4GHz band. The maximum gain of the dual-band / broadband antenna is positive in both the 2.4 and 5 GHz frequency bands.
  • FIG. 5 shows on an electronic card 10, an antenna system consisting of three antennas 11, 12, 13 each made according to the method described above.
  • each of the antennas 11, 12 and 13 may be designed to operate either in a dual band or operating in a given frequency band depending on the type of device in which the electronic card 10 is to be integrated.
  • WIFI antennas from a standard card, as explained below.
  • An electronic card comprises, for example, three wireless systems.
  • 1 system consists of three antennas 11, 12, 13 as described above. This first system can operate at first and second frequencies f1 and f2.
  • the second system 14 operates at a frequency f1.
  • the third system 15 operates at a frequency f3.
  • a first configuration will use two RF circuits No. 1 and No. 2 operating respectively in the frequency bands f1 and f2.
  • an antenna system No. 1 and No. 2 is dedicated to each of the RF circuits operating respectively in the frequency bands f1 and f2 only.
  • a second configuration will use a single RF circuit, ie circuit # 1, circuit # 2 not being implemented on the circuit board. This RF circuit No. 1 will operate in the two frequency bands f1 and f2.
  • the antenna system No. 1 associated with the RF circuit No. 1 must now operate in the two frequency bands f1 and f2.
  • the antennas of the antenna system No. 1 must first operate in a frequency band f1 only and reject the frequency f2 for the configuration No. 1 and secondly, operate both in the frequency band f1 and f2 for configuration No. 2.
  • Antennas made according to the method of the present invention are particularly well suited for generic electronic cards as described above.

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  • Waveguide Aerials (AREA)

Abstract

The invention relates to a method for producing an antenna, operating in a given frequency band, from a dual-band antenna. According to the method, the dual-band antenna is a broadband slot antenna (1) that receives and/or transmits electromagnetic signals at a first frequency and at a second higher frequency. The antenna is powered by a single power supply line (3), and the free end of the power supply line is connected, by a connection means that can be opened or closed, to at least one means (4, 5) for rejecting one of the frequencies. The invention can be used in producing generic electronic boards.

Description

PROCEDE DE REALISATION D'UNE ANTENNE FONCTIONNANT DANS UNE BANDE DE FREQUENCES DONNEE A PARTIR D'UNE ANTENNE METHOD FOR MAKING AN ANTENNA OPERATING IN A FREQUENCY BAND GIVEN FROM AN ANTENNA
BI-BANDEDUAL BAND
La présente invention concerne un procédé de réalisation d'une antenne fonctionnant dans une bande de fréquences donnée à partir d'une antenne bi-bande ainsi qu'un système d'antenne utilisant ledit procédé.The present invention relates to a method of producing an antenna operating in a given frequency band from a dual-band antenna and an antenna system using said method.
Le développement des réseaux sans fils à large bande fait cohabiter plusieurs standards. L'on connait, par exemple, le standard IEEE802.11 a pour un fonctionnement dans la bande de fréquences située aux alentours de 5 GHz mais aussi les standards IEEE802.11 b et IEEE802.11g pour un fonctionnement dans des bandes de fréquences situées aux alentours de 2.4 GHz. Ces standards ont vocation à définir des règles de communication communes entre différents types d'appareils. De ce fait, il est fréquent que les appareils de communication actuellement sur le marché, puissent assurer une compatibilité multi- standard. Il y a donc une demande accrue pour que les cartes électroniques comportant des circuits et des antennes susceptibles de recevoir les signaux correspondants, puissent fonctionner dans différentes bandes de fréquences.The development of broadband wireless networks brings together several standards. We know, for example, the IEEE802.11a standard for operation in the frequency band around 5 GHz but also the IEEE802.11b and IEEE802.11g standards for operation in frequency bands located at around 2.4 GHz. These standards are intended to define common communication rules between different types of devices. As a result, it is common for communication devices currently on the market to provide multi-standard compatibility. There is therefore an increased demand for the electronic cards comprising circuits and antennas capable of receiving the corresponding signals, to operate in different frequency bands.
Cependant, avoir autant d'antennes que de bandes de fréquences utilisables n'est pas envisageable si l'on veut réaliser un dispositif compact.However, having as many antennas as usable frequency bands is not possible if one wants to achieve a compact device.
Pour répondre à cette demande, on a proposé notamment dans la demande de brevet français n° 2857165 au nom de THOMSON Licensing, une antenne fonctionnant dans deux bandes de fréquences et disposant de deux accès séparés. Dans ce cas, chaque accès correspond à une réception et/ou une émission dans une bande de fréquences déterminée et il est nécessaire d'avoir des moyens d'interfaçage qui permettent la sélection et la transmission des signaux dans ladite bande de fréquences déterminée. II existe actuellement un besoin de développer une carte électronique générique supportant la mise en place de tout ou partie des fonctions sans fils sans avoir à redimensionner les antennes.To meet this demand, it has been proposed in particular in the French patent application No. 2857165 in the name of THOMSON Licensing, an antenna operating in two frequency bands and having two separate accesses. In this case, each access corresponds to reception and / or transmission in a determined frequency band and it is necessary to have interfacing means that allow the selection and transmission of signals in said determined frequency band. There is currently a need to develop a generic electronic card supporting the implementation of all or part of the wireless functions without having to resize the antennas.
La présente invention concerne donc un procédé permettant de réaliser une antenne fonctionnant dans une bande de fréquences donnée à partir d'une antenne bi-bande ou large bande. De ce fait, il est possible d'avoir des cartes sur lesquelles un système d'antennes peut fonctionner selon différents standards et de réaliser, en fonction du standard choisi, une antenne spécifique. La présente invention concerne donc un procédé de réalisation d'une antenne fonctionnant dans une bande de fréquences donnée à partir d'une antenne bi-bande, l'antenne bi-bande étant une antenne large bande de type fente recevant et/ou émettant des signaux électromagnétiques à une première fréquence et à une deuxième fréquence plus élevée, l'antenne étant alimentée par une seule ligne d'alimentation, caractérisée en ce que l'extrémité libre de la ligne d'alimentation est reliée par l'intermédiaire d'un moyen de connexion qui peut être ouvert ou fermé à un moyen de réjection d'une des fréquences.The present invention therefore relates to a method for producing an antenna operating in a given frequency band from a dual-band or broadband antenna. Therefore, it is possible to have cards on which an antenna system can operate according to different standards and to achieve, depending on the chosen standard, a specific antenna. The present invention therefore relates to a method of producing an antenna operating in a given frequency band from a dual-band antenna, the dual-band antenna being a slot-type broadband antenna receiving and / or transmitting electromagnetic signals at a first frequency and a second higher frequency, the antenna being fed by a single power supply line, characterized in that the free end of the power supply line is connected via a connecting means which can be open or closed to a means of rejection of one of the frequencies.
Selon un mode de réalisation préférentiel, l'antenne bi-bande est constituée par une fente s'évasant au niveau de son extrémité rayonnante telle qu'une antenne Vivaldi ou plus généralement une antenne TSA pour, en anglais, « Tapered Slot Antenna ». La ligne d'alimentation est une ligne microruban et le moyen de réjection comporte un tronçon de ligne microruban. Dans ce cas, le tronçon de ligne est connecté par un élément de connexion formant court-circuit à l'extrémité en circuit ouvert de la ligne microruban d'alimentation. La longueur électrique de l'ensemble constitué du tronçon de ligne, de l'élément de connexion formant court circuit et de la partie de la ligne d'alimentation se trouvant après la transition ligne/fente est choisie telle que L = λg/4 où λg est la longueur d'onde guidée dans les lignes à la fréquence de réjection. La présente invention concerne aussi un système d'antennes comportant au moins une antenne bi-bande pouvant être transformée en antenne fonctionnant dans une bande de fréquences donnée, selon le procédé décrit ci-dessus. L'utilisation de ce procédé permet d'avoir plusieurs configurations possibles basées sur une même carte électronique.According to a preferred embodiment, the dual-band antenna is constituted by a slot flaring at its radiating end such as a Vivaldi antenna or more generally a TSA antenna for, in English, "Tapered Slot Antenna". The supply line is a microstrip line and the rejection means comprises a microstrip line section. In this case, the line section is connected by a connection element forming a short-circuit at the open-circuit end of the microstrip line. The electrical length of the assembly consisting of the line section, the short-circuit connection element and the part of the supply line lying after the line / slot transition is chosen such that L = λg / 4 where λg is the guided wavelength in the lines at the rejection frequency. The present invention also relates to an antenna system comprising at least one dual-band antenna that can be transformed into an antenna operating in a given frequency band, according to the method described above. The use of this method makes it possible to have several possible configurations based on the same electronic card.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description faite ci-après avec référence aux dessins ci-annexés dans lesquels :Other characteristics and advantages of the present invention will appear on reading the description given below with reference to the attached drawings in which:
Figure 1 est une vue en plan de dessus schématique d'une antenne bi-bande pouvant être transformée en antenne fonctionnant dans une bande de fréquences donnée conformément à la présente invention.Figure 1 is a schematic top plan view of a dual-band antenna that can be transformed into an antenna operating in a given frequency band in accordance with the present invention.
Figure 2 est une vue en plan de dessus schématique représentant une antenne fonctionnant dans une bande de fréquences donnée obtenue avec le procédé de la présente invention. Figure 3 représente la courbe d'adaptation en impédance sur 50Figure 2 is a schematic top plan view showing an antenna operating in a given frequency band obtained with the method of the present invention. Figure 3 shows the impedance matching curve over 50
Ohms en fonction de la fréquence respectivement de l'antenne fonctionnant dans une bande de fréquences donnée et de l'antenne bi-bandeOhms as a function of the frequency respectively of the antenna operating in a given frequency band and the dual-band antenna
Figure 4 représente la courbe de gain en fonction de la fréquence respectivement de l'antenne fonctionnant dans une bande de fréquences donnée et de l'antenne bi-bandeFIG. 4 represents the gain curve as a function of the frequency respectively of the antenna operating in a given frequency band and of the dual-band antenna
Figure 5 est une vue en plan de dessus schématique représentant un système de trois antennes réalisées selon le procédé de la présente invention.Figure 5 is a schematic top plan view showing a system of three antennas made according to the method of the present invention.
On décrira tout d'abord avec référence à la figure 1 , une représentation schématique d'une antenne bi-bande susceptible de recevoir et/ou d'émettre des signaux électromagnétiques à une première fréquence, à savoir dans une bande de fréquences autour de 2.4 GHz et, à une seconde fréquence, à savoir dans la bande de fréquence autour de 5 GHz.A schematic representation of a dual-band antenna capable of receiving and / or emitting electromagnetic signals at a first frequency, namely in a frequency band around 2.4 will be described first with reference to FIG. GHz and, at a second frequency, namely in the frequency band around 5 GHz.
L'antenne représentée sur la figure 1 est une antenne à fente évasée 1 , plus particulièrement une antenne dite Vivaldi. De manière connue, cette antenne est obtenue en gravant une fente évasée sur un substrat muni sur une de ses faces d'un plan de masse 2 dans lequel est réalisée la fente 1.The antenna shown in FIG. 1 is a flared slot antenna 1, more particularly an antenna called Vivaldi. In known manner, this antenna is obtained by engraving a flared slot on a substrate provided on one of its faces with a plane of mass 2 in which the slot 1 is made.
Le substrat est, par exemple, un substrat FR4 de permittivité relative εr = 4.4 et d'épaisseur 1.4 mm. La fente 1 est évasée au niveau de son extrémité rayonnante et les dimensions de la fente, à savoir la largeur de l'évasement, la longueur de la fente et le rayon de courbure, sont choisies afin d'avoir une bande passante qui englobe les deux bandes de fréquences 2.4 GHz et 5 GHz correspondant aux standards IEEE802.11 a, b et g. De manière connue, l'antenne Vivaldi 1 est alimentée par couplage électromagnétique par une ligne d'alimentation 3 reliée à des circuits, non représentés, d'émission et de réception des signaux électromagnétiques. Cette ligne d'alimentation 3 est constituée, dans le mode de réalisation représenté, par une ligne microruban 3 réalisée sur la face du substrat opposée à la face métallisée 2. Elle croise la fente de l'antenne Vivaldi de sorte que son extrémité libre 3' soit en circuit ouvert tandis que l'extrémité 1 ' de la fente 1 se trouve en court-circuit. La longueur L3 définit la longueur de la ligne micro-ruban 3' entre son extrémité en circuit ouvert et le plan de la transition entre la ligne fente 1 et la ligne micro-ruban 3.The substrate is, for example, a substrate FR4 with a relative permittivity εr = 4.4 and a thickness of 1.4 mm. The slot 1 is flared at its radiating end and the slot dimensions, namely the width of the flare, the slot length and the radius of curvature, are chosen so as to have a bandwidth that includes the two 2.4 GHz and 5 GHz frequency bands corresponding to IEEE802.11 a, b and g standards. In a known manner, the Vivaldi antenna 1 is powered by electromagnetic coupling by a power supply line 3 connected to circuits, not shown, for transmitting and receiving the electromagnetic signals. This supply line 3 is constituted, in the embodiment shown, by a microstrip line 3 made on the face of the substrate opposite the metallized face 2. It crosses the slot of the antenna Vivaldi so that its free end 3 'in open circuit while the end 1' of the slot 1 is in short circuit. The length L3 defines the length of the micro-ribbon line 3 'between its open-circuit end and the plane of the transition between the slot line 1 and the micro-ribbon line 3.
D'autre part, comme représenté sur la figure 1 , un tronçon de ligne microruban 4 est réalisé dans le prolongement de l'extrémité libre 3' de la ligne d'alimentation 3. Ce tronçon de ligne microruban 4 présente une longueur L4. L4 est choisie telle que la somme de L4 + L3 + L5 soit ≡ λg/4 où λg correspond à la fréquence de réjection souhaitée, à savoir 2.4 GHz dans le mode de réalisation. L5 correspond à la longueur électrique de l'espacement entre l'extrémité 3' de la ligne d'alimentation et l'extrémité du tronçon de ligne 4, cet espacement étant destiné à recevoir un élément de connexion qui peut être ouvert ou fermé, à savoir un élément formant court circuit, pour une certaine bande de fréquence comme expliqué ci-après. Comme représenté sur la figure 1 , l'autre extrémité 4' du tronçon de ligne 4 est reliée par un via ou connectée au plan de masse.On the other hand, as shown in Figure 1, a microstrip line section 4 is formed in the extension of the free end 3 'of the feed line 3. This section of microstrip line 4 has a length L4. L4 is chosen such that the sum of L4 + L3 + L5 is ≡ λg / 4 where λg corresponds to the desired rejection frequency, namely 2.4 GHz in the embodiment. L5 corresponds to the electrical length of the spacing between the end 3 'of the supply line and the end of the line section 4, this spacing being intended to receive a connection element which can be open or closed, to namely a short circuit element, for a certain frequency band as explained below. As shown in Figure 1, the other end 4 'of the line section 4 is connected via a via or connected to the ground plane.
On décrira maintenant avec référence à la figure 2, le procédé conforme à la présente invention qui permet de transformer l'antenne bi- bande de la figure 1 en une antenne fonctionnant uniquement sur une bande de fréquence autour de la seconde fréquence, à savoir 5 GHz dans le mode de réalisation représenté.With reference to FIG. 2, the method according to the present invention will now be described which makes it possible to transform the dual-band antenna of FIG. 1 into an antenna operating solely on a frequency band around the second frequency, namely GHz in the embodiment shown.
Sur la figure 2, les éléments identiques à ceux de la figure 1 portent les mêmes références et ne seront pas re-décrits en détail ci-après. Conformément à la présente invention, pour réaliser une antenne fonctionnant dans une bande de fréquences donnée à partir de l'antenne bi- bande de la figure 1 , l'extrémité 3' de la ligne microruban 3 d'alimentation est reliée par un élément de connexion formant court-circuit 5 au tronçon 4 de ligne. Cet élément est un court circuit RF qui peut-être réalisé par une résistance de valeur OOhm ou aussi par une capacité dimensionnée de façon à ce que son impédance soit quasi-nulle à la fréquence à rejeter, à savoir 2.4GHz dans le mode de réalisation représenté. Comme mentionné ci-dessus, la somme des longueurs L4 , L3, L5 est sensiblement égale à λg/4. Cet ensemble forme un élément de réjection permettant de filtrer la première fréquence, à savoir 2.4 GHz et, de ce fait, l'antenne Vivaldi fonctionne comme une antenne mono-bande à 5 GHz.In Figure 2, the elements identical to those of Figure 1 bear the same references and will not be described in detail below. In accordance with the present invention, to provide an antenna operating in a given frequency band from the dual-band antenna of FIG. 1, the 3 'end of the microstrip line 3 is connected by an antenna element. short-circuit connection 5 to line section 4. This element is a short-circuit RF which can be realized by a resistance of value OOhm or also by a capacitance dimensioned so that its impedance is quasi-zero with the frequency to be rejected, namely 2.4GHz in the embodiment represent. As mentioned above, the sum of the lengths L4, L3, L5 is substantially equal to λg / 4. This set forms a rejection element for filtering the first frequency, namely 2.4 GHz and, as a result, the Vivaldi antenna operates as a single-band antenna at 5 GHz.
Des antennes telles que représentées aux figures 1 et 2 ont été simulées en utilisant un logiciel électromagnétique basé sur la méthode des moments. La figure 3 représente la courbe d'adaptation en impédance surAntennas as shown in FIGS. 1 and 2 have been simulated using electromagnetic software based on the method of moments. Figure 3 shows the impedance matching curve on
50 Ohms en fonction de la fréquence de l'antenne fonctionnant dans une bande de fréquences donnée (figure 2) et de l'antenne bi-bande (figure 1 ). L'antenne fonctionnant dans une bande de fréquences donnée possède une adaptation meilleure que -15 dB dans la bande de fréquences des 5GHz alors que son adaptation dans la bande de fréquence des 2.4GHz n'est que de -0.85dB. L'antenne fonctionnant dans une bande de fréquences donnée est bien désadaptée dans la bande 2.4GHz.50 Ohms depending on the frequency of the antenna operating in a given frequency band (Figure 2) and the dual-band antenna (Figure 1). The antenna operating in a given frequency band has an adaptation better than -15 dB in the 5GHz frequency band whereas its adaptation in the 2.4GHz frequency band is only of -0.85dB. The antenna operating in a given frequency band is well mismatched in the 2.4GHz band.
L'antenne bi-bande/ large bande est correctement adaptée dans les deux bandes de fréquence 2.4 et 5 GHz avec un niveau respectivement meilleur que -13dB et -15dB.The dual-band / broadband antenna is correctly adapted in both the 2.4 and 5 GHz frequency bands with respectively a better level than -13 dB and -15 dB.
La figure 4 représente la courbe donnant le gain maximal en fonction de la fréquence de l'antenne fonctionnant dans une bande de fréquences donnée et de l'antenne bi-bande simulée avec le même logiciel que précédemment. A la lecture des ces deux courbes, l'on voit que le gain de l'antenne fonctionnant dans une bande de fréquences donnée est positif dans la bande des 5GHz, alors que celui-ci s'effondre dans la bande des 2.4GHz. Le gain maximal de l'antenne bi-bande/ large bande est lui positif dans les deux bandes de fréquence 2.4 et 5 GHz.FIG. 4 represents the curve giving the maximum gain as a function of the frequency of the antenna operating in a given frequency band and of the dual-band antenna simulated with the same software as previously. Reading these two curves, we see that the gain of the antenna operating in a given frequency band is positive in the 5GHz band, as it collapses in the 2.4GHz band. The maximum gain of the dual-band / broadband antenna is positive in both the 2.4 and 5 GHz frequency bands.
Sur la figure 5, on a représenté sur une carte électronique 10, un système d'antennes constitué de trois antennes 11 , 12, 13 réalisées chacune selon le procédé décrit ci-dessus. Ainsi, chacune des antennes 11 , 12 et 13 peut être conçue pour fonctionner soit en bi-bande soit en fonctionnant dans une bande de fréquences donnée selon le type d'appareil dans lequel doit être intégrée la carte électronique 10. Cela permet de personnaliser les antennes WIFI à partir d'une carte standard, comme expliqué ci-après.FIG. 5 shows on an electronic card 10, an antenna system consisting of three antennas 11, 12, 13 each made according to the method described above. Thus, each of the antennas 11, 12 and 13 may be designed to operate either in a dual band or operating in a given frequency band depending on the type of device in which the electronic card 10 is to be integrated. WIFI antennas from a standard card, as explained below.
Une carte électronique comporte, par exemple, trois systèmes sans fils . Le 1er système est composé de 3 antennes 11 , 12, 13 telles que décrites ci-dessus. Ce premier système peut fonctionner à une première et une seconde fréquences f1 et f2. Le second système 14 fonctionne à une fréquence f1. Le troisième système 15 fonctionne à une fréquence f3.An electronic card comprises, for example, three wireless systems. 1 system consists of three antennas 11, 12, 13 as described above. This first system can operate at first and second frequencies f1 and f2. The second system 14 operates at a frequency f1. The third system 15 operates at a frequency f3.
Avec le premier système, il est possible de fonctionner selon plusieurs configurations sans avoir à redimensionner les antennes. Ainsi, une première configuration utilisera deux circuits RF n°1 et n°2 fonctionnant respectivement dans les bandes de fréquence f1 et f2. Afin de permettre un fonctionnement simultané, un système d'antennes n°1 et n°2 est dédié à chacun des circuits RF fonctionnant respectivement dans les bandes de fréquence f1 et f2 uniquement. Une deuxième configuration utilisera un seul circuit RF, à savoir le circuit n°1 , le circuit n°2 n'étant pas implémenté sur la carte électronique. Ce circuit RF n°1 fonctionnera dans les deux bandes de fréquence f1 et f2. Le système d'antenne n°1 associé au circuit RF n°1 doit fonctionner maintenant dans les deux bandes de fréquence f1 et f2.With the first system, it is possible to operate in several configurations without having to resize the antennas. Thus, a first configuration will use two RF circuits No. 1 and No. 2 operating respectively in the frequency bands f1 and f2. In order to allow simultaneous operation, an antenna system No. 1 and No. 2 is dedicated to each of the RF circuits operating respectively in the frequency bands f1 and f2 only. A second configuration will use a single RF circuit, ie circuit # 1, circuit # 2 not being implemented on the circuit board. This RF circuit No. 1 will operate in the two frequency bands f1 and f2. The antenna system No. 1 associated with the RF circuit No. 1 must now operate in the two frequency bands f1 and f2.
Dans ce cas, les antennes du système d'antenne n°1 doivent d'une part fonctionner dans une bande de fréquence f1 seulement et rejeter la fréquence f2 pour la configuration n°1 et d'autre part, fonctionner à la fois dans la bande de fréquence f1 et f2 pour la configuration n°2.In this case, the antennas of the antenna system No. 1 must first operate in a frequency band f1 only and reject the frequency f2 for the configuration No. 1 and secondly, operate both in the frequency band f1 and f2 for configuration No. 2.
Les antennes réalisées selon le procédé de la présente invention sont particulièrement bien adaptées pour des cartes électroniques génériques telles que décrites ci-dessus.Antennas made according to the method of the present invention are particularly well suited for generic electronic cards as described above.
Il est évident pour l'homme de l'art que différentes modifications peuvent être apportées au mode de réalisation décrit ci-dessus. Il est possible d'envisager plusieurs tronçons de ligne de différentes longueurs pouvant être connectés à l'extrémité en circuit ouvert de la ligne d'alimentation, le tronçon étant choisi en fonction de la fréquence que l'on veut rejeter. It is obvious to those skilled in the art that various modifications can be made to the embodiment described above. It is possible to envisage several line sections of different lengths that can be connected to the open-circuit end of the power line, the section being selected according to the frequency that is to be rejected.

Claims

REVENDICATIONS
1. Un procédé de réalisation d'une antenne fonctionnant dans une bande de fréquences donnée à partir d'une antenne bi-bande, l'antenne bi- bande étant une antenne large bande de type fente (1 ) recevant et/ou émettant des signaux électromagnétiques à une première fréquence et à une deuxième fréquence plus élevée, l'antenne étant alimentée par une seule ligne (3) d'alimentation, caractérisée en ce que l'extrémité libre de la ligne d'alimentation est reliée par un moyen de connexion qui peut être ouvert ou fermé à au moins un moyen de réjection (4,5) d'une des fréquences.A method of producing an antenna operating in a given frequency band from a dual-band antenna, the dual-band antenna being a slot-type broadband antenna (1) receiving and / or transmitting electromagnetic signals at a first frequency and at a second higher frequency, the antenna being fed by a single power supply line (3), characterized in that the free end of the power supply line is connected by means of connection which can be open or closed to at least one means of rejection (4,5) of one of the frequencies.
2. Procédé selon la revendication 1 , caractérisé en ce que l'antenne bi-bande est constituée par une fente s'évasant au niveau de son extrémité rayonnante telle qu'une antenne Vivaldi ou une antenne TSA (« Tapered Slot Antenna » en anglais).2. Method according to claim 1, characterized in that the dual-band antenna is constituted by a slot flaring at its radiating end such as a Vivaldi antenna or an antenna TSA ("Tapered Slot Antenna" in English). ).
3. Procédé selon l'une des revendications précédentes, caractérisé en ce que la ligne d'alimentation est une ligne micro-ruban.3. Method according to one of the preceding claims, characterized in that the supply line is a micro-ribbon line.
4. Procédé selon l'une des revendications précédentes, caractérisé en ce que le moyen de réjection comporte un tronçon de ligne micro-ruban relié à l'extrémité en circuit ouvert de la ligne d'alimentation.4. Method according to one of the preceding claims, characterized in that the rejection means comprises a microstrip line section connected to the open circuit end of the supply line.
5. Procédé selon l'une des revendications précédentes, caractérisé en ce que le moyen de connexion est constitué par un élément formant court-circuit.5. Method according to one of the preceding claims, characterized in that the connecting means is constituted by a short-circuit element.
6. Procédé selon les revendications 3 à 5, caractérisé en ce que la longueur de l'ensemble constitué du tronçon de ligne, de l'élément en court circuit et de la ligne d'alimentation entre son extrémité en circuit ouvert et le plan de transition est égale à λg/4 où λg est la longueur d'onde guidée à la fréquence de réjection.6. Method according to claims 3 to 5, characterized in that the length of the assembly consisting of the line section, the short-circuit element and the supply line between its open circuit end. and the transition plane is equal to λg / 4 where λg is the guided wavelength at the rejection frequency.
7. un système d'antenne comportant au moins une antenne bi- bande (11 , 12, 13) pouvant être transformée en antenne fonctionnant dans une bande de fréquences donnée selon le procédé des revendications 1 à 6. 7. An antenna system comprising at least one bi-band antenna (11, 12, 13) transformable into an antenna operating in a given frequency band according to the method of claims 1 to 6.
EP10709901.2A 2009-03-05 2010-02-24 Methode of realizing an antenna operating in a given frequnecy band from a dual band antenna Active EP2404348B8 (en)

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FR0951398 2009-03-05
PCT/FR2010/050309 WO2010100365A1 (en) 2009-03-05 2010-02-24 Method for producing an antenna, operating in a given frequency band, from a dual-band antenna

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EP2404348B8 (en) 2018-12-05
EP2404348B1 (en) 2018-09-05
US20120098722A1 (en) 2012-04-26
WO2010100365A1 (en) 2010-09-10
US9105983B2 (en) 2015-08-11

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