EP1911120B1 - System of diversity dipole antennas - Google Patents

System of diversity dipole antennas Download PDF

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Publication number
EP1911120B1
EP1911120B1 EP06764216A EP06764216A EP1911120B1 EP 1911120 B1 EP1911120 B1 EP 1911120B1 EP 06764216 A EP06764216 A EP 06764216A EP 06764216 A EP06764216 A EP 06764216A EP 1911120 B1 EP1911120 B1 EP 1911120B1
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EP
European Patent Office
Prior art keywords
arm
arms
antenna
antenna system
electronic card
Prior art date
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Active
Application number
EP06764216A
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German (de)
French (fr)
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EP1911120A1 (en
Inventor
Philippe Minard
Jean-François PINTOS
Ali Louzir
Philippe Gilberton
Jean-Luc Robert
Corinne Nicolas
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THOMSON LICENSING
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Thomson Licensing SAS
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Publication of EP1911120A1 publication Critical patent/EP1911120A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/084—Pivotable antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/20—Two collinear substantially straight active elements; Substantially straight single active elements

Definitions

  • the present invention relates to a diversity antenna system comprising at least two dipole type antennas.
  • the present invention relates more particularly to an antenna system of the above type for the reception of television signals, in particular the reception of digital signals on a portable electronic device such as a laptop commonly called PC, a PVA (for Assistant Personnel) or for other similar devices requiring an antenna system to receive electromagnetic signals.
  • the present invention also relates to a support for the antenna system for attachment to the portable device.
  • the devices currently on the market are most often constituted by an independent antenna such as a whip or loop antenna mounted on a housing comprising a USB connector.
  • the antenna described in the French patent application No. 05 51009 comprises a first and a second conductive arm supplied in differential, one of said arm said first arm forming at least one cover for an electronic card.
  • the first arm is in the form of a housing in which is inserted the electronic card which comprises the processing circuits of the signals received by the dipole type antenna.
  • the present invention relates to a diversity antenna system comprising at least two dipole type antennas each formed of a first and a second conducting arm, supplied with a differential.
  • the two antennas comprise a common arm said first arm forming at least one cover for an electronic card and each a second arm rotatably mounted at one end of the first arm.
  • the second arms are rotatably mounted at one end of the first arm about a common axis and, preferably, the second arms have profiles identical to and complementary to the profile of the first arm so as to be able to fold over one side of the first arm.
  • each second arm is rotatably mounted at one end of the first arm about a proper axis.
  • the second arms have identical profiles corresponding to the side walls of the housing formed by the first arm.
  • the second arms may also have complementary profiles for folding on one of the upper and / or lower faces of the first arm.
  • the first arm has the shape of a housing, in which is inserted an electronic card, more particularly the electronic card used to process the signals received by the antenna and send them to a portable display apparatus such as a laptop or the like.
  • the electronic card comprises at one end at least two connection ports for the supply of each antenna of the system and at the other end a connection port formed, for example, by a USB connector allowing the connection to a portable electronic device such as a laptop or the like.
  • the present invention relates to a support for the antenna system comprising a fixing means on the adjustable portable device and means for receiving the first arm of the system rotatably mounted on the fastening means.
  • this dipole antenna comprises a first conducting arm 1 and a second conducting arm 2, the two arms being connected to each other via a hinge zone 3 located at one of the ends of each of the arms.
  • the arm 1 has substantially the shape of a housing with a portion 1a of substantially rectangular shape extending by a curved portion 1b flaring gradually to allow the energy to be radiated gradually favoring thus adapting to a wider frequency band.
  • the length of the arm 1 is substantially equal to ⁇ / 4 where ⁇ represents the wavelength at the central operating frequency.
  • the length of the arm 1 is close to 112 mm for operation in the UHF band (band between 470 and 862 MHz).
  • the antenna comprises a second arm 2 mounted to rotate about the axis 3 which also represents the connection point of the antenna to the signal processing circuit.
  • the electrical connection of the antenna is made by a metal wire, for example a coaxial cable or the like while the axis of rotation is made of a material relatively transparent to electromagnetic waves.
  • the arm 2 whose length is substantially equal to ⁇ / 4, has a curved profile followed by a rectangular flat portion, for folding the arm 2 completely against the arm 1 in the closed position.
  • the arm 2 being rotatably mounted relative to the arm 1, this makes it possible to modify the orientation of the arm 2 so as to optimize the reception of the television signal.
  • the radiation patterns are inclined according to the angle of inclination of the arm. This inclination thus makes it possible to optimize the reception of the digital television signal.
  • an antenna system comprises two antennas consisting of a first common arm 10 forming at least the cover 10a of an electronic card for processing the signal received by the antenna.
  • the common arm 10 has an upper portion or cover member 10a and a lower portion 10b, the assembly forming a housing for receiving an electronic card processing the received signals.
  • Simulations were performed on a system as shown in figure 3 and having the following characteristics: 1) the material used is copper of conductivity 4.9 * 10 e 7S / m, 2) the length of arm 11 is approximately equal to 112mm, 3) the radius of curvature used for parts 10a, 10b , 11, 12 is 31 mm, 4) the width of the arms 10, 11 and 12 is about 25mm so as to insert the electronic card width 20mm.
  • the results obtained during the simulation carried out in a known manner using the IE3D software are given on the Figures 4 to 8 .
  • the curves show that the adaptation is performed on a relatively narrow band that can be improved by using an adaptation cell.
  • This cell is conventionally constituted by an LC circuit.
  • Adaptation and isolation curves with adaptation cell are represented on the figure 5 . In this case, the adaptation is performed on a larger frequency band.
  • the insulation between the first antenna formed of the first arm 10 and the second arm 11 and the second antenna formed of the first arm 10 and the second arm 12 remains sufficient to provide a significant gain in diversity, especially taking into account the vertical polarizations for the first antenna and horizontal for the second antenna as well as strong decorrelations of radiation pattern as shown on the figure 6 .
  • the radiation patterns of the figure 6 show a maximum decoupling and an optimal decorrelation between the two accesses when the two second branches 11, 12 are positioned perpendicularly with respect to each other.
  • the two arms 11 and 12 are held at positions perpendicular to each other whatever the angle ⁇ of the first antenna, for example to say antenna constituted by the first common arm 10 and the second arm 11.
  • the efficiency of the antenna system is greater than 50% over almost the entire UHF band, which meets the desired performance.
  • An average gain around 0 dBi over the entire UHF band corresponds to a 3dBi directivity for this type of antenna with a yield of 50%.
  • the antenna system comprises two dipole type antennas formed of a first arm 20 common to the two antennas.
  • Each antenna has a second arm 21, 22 rotatably mounted at one end of the first arm.
  • Each second arm 21, 22 pivots independently around two axes of rotation 23, 24 separate.
  • the two arms 21, 22 can form the side walls of the first common arm 20, as will be explained in more detail below.
  • the first common arm 20 comprises a rectangular portion 20a forming a housing for an electronic card for, for example, the processing of electromagnetic signals received or transmitted by the antenna system.
  • the rectangular portion 20a is extended by a curved portion 20b flaring out gradually.
  • the two second arms 21, 22 have a profile adapted to the side portions of the first conductive arm 20. More specifically, they have a substantially rectangular portion extending through a curved portion.
  • the arms 21 and 22 can be oriented relative to the first arm 20 at angles ⁇ 1 and ⁇ 2 which therefore represent the opening angle between respectively the second arm 22 and the arm 20 and the second arm 21 and the arm 20 Since the two axes of rotation 23 and 24 are distant from each other, a spatial diversity is observed, in addition to a diversity of radiation, related to the spatial separation of the two antennas formed by the dipoles 21, 20 and 22, 20.
  • the two second arms 21 and 22 being rotatably mounted around two separate axes 23, 24 provided at the end of the first arm 20, it is possible to rotate them so that in the unused position, the two arms 21, 22 fold on the lateral faces of the first common arm 20 giving a compact system easily transportable when not in use.
  • the antenna has a natural adaptation around the central operating frequency but not on the entire UHF band for both values of ⁇ .
  • the isolation difference for the two values of ⁇ is proportional to the correlation of the antenna system diagrams. This makes it possible, depending on the frequency channel used, to adjust the insulation and thus to improve the desired effect by using diversity.
  • the adaptation circuit here makes it possible to widen the adaptation bandwidth considered for a level of S11 to -6 dB, which is a value that is typical for the intended application.
  • the remark concerning the insulation of the figure 13 also applies here.
  • the figure 15 represents the system yield curves while the figure 16 represents the gain curves for the two antennas of the antenna system described above.
  • the performance of the antenna system is greater than 60% over almost the entire UHF band, which reflects a good performance for the intended application.
  • An average gain around 0.5dBi over the entire UHF band corresponds to a directivity of 3dBi for this type of antennas with a yield of 60%.
  • the first arm or common arm 30 has a shape substantially elliptical with a main axis x, x. Near one end of the main axis x, x are mounted around two distinct axes 33, 34 the two second arms 31, 32 of the two dipole type antennas. These two arms have the shape of a half ellipse.
  • the two arms 31, 32 are rotatably mounted so as to be able to fold respectively on the upper face and the lower face of the common arm 30.
  • a system with two antennas of this type has been simulated and the figure 18 gives the adaptation and isolation curves of such an antenna.
  • the characteristics used for the simulation are as follows: 1) the material used is copper of conductivity 4.9 * 10 e 7S / m, 2) the two axes of the ellipse for the elements 30, 31 and 32 have dimensions, respectively 25mm and 50mm, 3) the thickness of the housing is 12mm, which allows to insert the electronic card thickness of 10mm.
  • the diversity antenna system comprises a first common arm 40 having an oblong housing shape. At the end of the housing 40 are provided two separate axes 43, 44 on which are respectively mounted a first second arm 41 and a second second arm 42 to obtain the two dipole antennas forming the antenna system-compliant with the invention. These arms 41 and 42 of oblong shape can rotate about the axes 43 and 44 and fall back on the lateral sides of the first common arm 40 forming a housing.
  • the system comprises a first common arm 50.
  • This arm has a shape identical to the first arm 30 of the embodiment of the figure 9 .
  • At the flared end of the arm 50 are provided two distinct axes of rotation 53, 54 on which are respectively mounted a first second arm 51 and a second second arm 52.
  • the first second arm 51 has a part that can be folded down on the side face of the first arm 50.
  • This portion 51 is extended perpendicularly by a rectangular member 51 'to fall back under the arm 50 while the second second arm 52 has a main portion 52 can be folded on the another side face of the element 50, this portion 52 extending by a rectangular portion 52 'perpendicular which is folded down on the upper part of the element 50.
  • This electronic card schematically comprises a first amplifier LNA (Low Noise Amplifier or "Low Noise Amplifier”) 100 connected in 1A to one of the antennas of the antenna system according to the present invention.
  • the LNA amplifier 100 is connected to a tuner 101 itself connected to a demodulator 102.
  • the card comprises a second LNA amplifier 110 connected at 1B to the second antenna.
  • the LNA 110 is connected to a tuner 111 connected to a demodulator 112.
  • the two demodulators 102 and 112 are interconnected so as to have a master demodulator, namely 112 in the embodiment shown and a slave demodulator, namely 102 in the embodiment shown.
  • the output of the master demodulator 112 is connected to a USB interface 120, itself connected to a USB connector 130 for connecting the antenna system to the USB port of a portable terminal such as a laptop or PC or any other device. another device of the same type.
  • the carrier includes a box-like member 210 for receiving the common arm 10 of the antenna system of the present invention.
  • the element 110 comprises an upper opening 211 adapted to receive said arm and a lower opening allowing the connecting to a connector on the portable device such as a USB connector.
  • the element 210 is rotatably mounted about the axis 212 on a fixing means 200 for fixing the antenna support to a device, more particularly on the screen 300 of a laptop.
  • the attachment means 200 comprises an L-shaped member 201 on which the box-shaped member 210 is mounted.
  • the perpendicular portion of the L-shaped member has an opening 202 forming a slider.
  • a second element 203 L In this slide is inserted a second element 203 L, the two elements L 202 and 203 forming clamp on the screen 300.
  • the element 203 is provided on its part fitting into the slide of a oblong hole not shown. Once in position, the spacing between the element 203 and the element 201 is maintained by a clamping means 204 such as a clamping screw or the like.
  • the free portion of the second L-shaped member is curved inward, reinforcing the pincer effect.
  • a first adjustment makes it possible to tighten the support on the edge of the screen so as to fit on any type of screen.
  • a second adjustment can be made by rotating the element 210 receiving the antenna system around the axis 212 to orient the antennas so as to optimize the quality reception for a given channel.

Abstract

The invention relates to a system of diversity antennas comprising at least two dipole antennas each formed of a first and of a second conducting arm with differential supply, in which the two antennas comprise a common arm (10) called the first arm forming at least one cover for an electronic card and each comprise a second arm (11, 12) rotationally mounted at one end of the first arm.

Description

La présente invention concerne un système d'antennes à diversité comportant au moins deux antennes de type dipôle. La présente invention concerne plus particulièrement un système d'antennes du type ci-dessus pour la réception de signaux de télévision, notamment la réception de signaux numériques sur un dispositif électronique portable tel qu'un ordinateur portable appelé communément PC, un PVA (pour Assistant Personnel) ou pour d'autres dispositifs similaires nécessitant un système d'antennes pour recevoir des signaux électromagnétiques. La présente invention concerne aussi un support pour le système d'antennes permettant sa fixation sur le dispositif portable.The present invention relates to a diversity antenna system comprising at least two dipole type antennas. The present invention relates more particularly to an antenna system of the above type for the reception of television signals, in particular the reception of digital signals on a portable electronic device such as a laptop commonly called PC, a PVA (for Assistant Personnel) or for other similar devices requiring an antenna system to receive electromagnetic signals. The present invention also relates to a support for the antenna system for attachment to the portable device.

Il existe actuellement sur le marché, des équipements permettant de recevoir les signaux pour la télévision numérique terrestre ou TNT directement sur son ordinateur portable. La réception des signaux de télévision numérique terrestre sur un ordinateur portable permet de bénéficier de la puissance de calcul dudit ordinateur pour le décodage d'une image numérique. Le plus souvent, ces équipement sont commercialisés sous la forme d'un boîtier avec deux interfaces, à savoir une interface RF (Radio-Fréquence) pour une connexion à une antenne VHF-UHF intérieure ou extérieure et une interface USB pour la connexion à l'ordinateur.There are currently on the market, equipment to receive the signals for digital terrestrial television or TNT directly on his laptop. The reception of terrestrial digital television signals on a portable computer makes it possible to benefit from the calculation power of said computer for the decoding of a digital image. Most often, this equipment is marketed in the form of a housing with two interfaces, namely an RF (Radio-Frequency) interface for connection to an indoor or outdoor VHF-UHF antenna and a USB interface for connection to the radio. 'computer.

Les dispositifs actuellement sur le marché sont le plus souvent constitués d'une antenne indépendante telle qu'une antenne de type fouet ou boucle montée sur un boîtier comportant un connecteur USB.The devices currently on the market are most often constituted by an independent antenna such as a whip or loop antenna mounted on a housing comprising a USB connector.

La demanderesse a proposé dans la demande de brevet français n° 05 51009 déposée le 20 avril 2005 , une antenne compacte large bande couvrant l'ensemble de la bande UHF constituée par une antenne de type dipôle. Cette antenne est associée à une carte électronique pouvant se connecter sur un appareil portable en utilisant notamment un connecteur de type USB.The Applicant has proposed in the French patent application No. 05 51009 filed on April 20, 2005 , a compact broadband antenna covering the entire UHF band consisting of a dipole type antenna. This antenna is associated with an electronic card that can connect to a portable device using a USB type connector.

De manière plus spécifique, l'antenne décrite dans la demande de brevet français n° 05 51009 comporte un premier et un second bras conducteur alimentés en différentiel, l'un des bras dit premier bras formant au moins un capot pour une carte électronique. De manière plus spécifique, le premier bras a la forme d'un boîtier dans lequel vient s'insérer la carte électronique qui comporte les circuits de traitement des signaux reçus par l'antenne de type dipôle.More specifically, the antenna described in the French patent application No. 05 51009 comprises a first and a second conductive arm supplied in differential, one of said arm said first arm forming at least one cover for an electronic card. More specifically, the first arm is in the form of a housing in which is inserted the electronic card which comprises the processing circuits of the signals received by the dipole type antenna.

Toutefois, cette solution bien que donnant de bons résultats au niveau de la réception, ne résout pas les problèmes dus aux évanouissements liés aux multi-trajets, en particulier lors de la réception à l'intérieur d'un bâtiment. En plus des multi-trajets, le signal subit une atténuation supplémentaire pour pénétrer à l'intérieur des bâtiments. Ces inconvénients se rencontrent lors de toute réception portable. Pour remédier à ces inconvénients, il est connu de l'homme de l'art d'utiliser une antenne à diversité qui permet d'améliorer la robustesse de la réception, notamment vis-à-vis des problèmes de multi-trajets.However, this solution although giving good results at the reception, does not solve the problems due to fading related to multipath, especially when receiving inside a building. In addition to the multipath, the signal is further attenuated to penetrate inside buildings. These disadvantages are encountered during any portable reception. To remedy these drawbacks, it is known to those skilled in the art to use a diversity antenna which makes it possible to improve the robustness of reception, in particular with regard to multipath problems.

Ainsi, la présente invention concerne un système d'antennes à diversité comportant au moins deux antennes de type dipôle formées chacune d'un premier et d'un second bras conducteur, alimentés en différentiel. Les deux antennes comportent un bras commun dit premier bras formant au moins un capot pour une carte électronique et chacune un second bras monté à rotation à une extrémité du premier bras.Thus, the present invention relates to a diversity antenna system comprising at least two dipole type antennas each formed of a first and a second conducting arm, supplied with a differential. The two antennas comprise a common arm said first arm forming at least one cover for an electronic card and each a second arm rotatably mounted at one end of the first arm.

Selon un premier mode de réalisation, les seconds bras sont montés à rotation à une extrémité du premier bras autour d'un axe commun et, de préférence, les seconds bras ont des profils identiques et complémentaires au profil du premier bras de manière à pouvoir se replier sur une des faces du premier bras.According to a first embodiment, the second arms are rotatably mounted at one end of the first arm about a common axis and, preferably, the second arms have profiles identical to and complementary to the profile of the first arm so as to be able to fold over one side of the first arm.

Selon un second mode de réalisation, chaque second bras est monté à rotation à une extrémité du premier bras autour d'un axe propre. Dans ce cas, les seconds bras ont des profils identiques correspondants aux parois latérales du boîtier formé par le premier bras. Les seconds bras peuvent aussi avoir des profils complémentaires permettant de les replier sur une des faces supérieures et/ou inférieures du premier bras.According to a second embodiment, each second arm is rotatably mounted at one end of the first arm about a proper axis. In this case, the second arms have identical profiles corresponding to the side walls of the housing formed by the first arm. The second arms may also have complementary profiles for folding on one of the upper and / or lower faces of the first arm.

Selon d'autres caractéristiques de la présente invention, le premier bras a la forme d'un boîtier, dans lequel vient s'insérer une carte électronique, plus particulièrement la carte électronique utilisée pour traiter les signaux reçus par l'antenne et les envoyer vers un appareil d'affichage portable tel qu'un ordinateur portable ou similaire. De ce fait, la carte électronique comporte à une extrémité au moins deux ports de connexion pour l'alimentation de chaque antenne du systémeαα et à l'autre extrémité un port de connexion formé, par exemple, par un connecteur USB permettant la connexion à un appareil électronique portable tel qu'un ordinateur portable ou similaire.According to other features of the present invention, the first arm has the shape of a housing, in which is inserted an electronic card, more particularly the electronic card used to process the signals received by the antenna and send them to a portable display apparatus such as a laptop or the like. As a result, the electronic card comprises at one end at least two connection ports for the supply of each antenna of the system and at the other end a connection port formed, for example, by a USB connector allowing the connection to a portable electronic device such as a laptop or the like.

Selon encore une autre caractéristique, la présente invention concerne un support pour le système d'antennes comportant un moyen de fixation sur l'appareil portable ajustable et un moyen pour recevoir le premier bras du système monté à rotation sur le moyen de fixation.According to yet another characteristic, the present invention relates to a support for the antenna system comprising a fixing means on the adjustable portable device and means for receiving the first arm of the system rotatably mounted on the fastening means.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description de différents modes de réalisation, cette description étant faite avec référence aux dessins ci-annexés dans lesquels :

  • Figure 1 est une vue en perspective schématique d'une antenne telle que décrite dans la demande de brevet français 05-51009 au nom de la demanderesse.
  • Figure 2 représente les diagrammes de rayonnement en gain de l'antenne de figure 1 pour les différentes positions du second bras.
  • Figure 3 est une vue en perspective schématique d'un premier mode de réalisation d'un système d'antennes conforme à la présente invention.
  • Figure 4 représente les courbes d'adaptation et d'isolation sans circuit d'adaptation pour un système d'antennes selon la figure 3.
  • Figure 5 représente les courbes d'adaptation et d'isolation avec un circuit d'adaptation pour un système d'antennes selon la figure 3.
  • Figure 6 représente les diagrammes de rayonnement d'un système d'antennes selon la figure 3 respectivement pour un angle α1 = 0° et pour un angle α2 = 90°.
  • Figure 7 représente le rendement du système d'antennes de la figure 3 dans la bande UHF pour α1 = 0° et α2 = 90° avec un circuit d'adaptation.
  • Figure 8 représente le gain du système d'antennes de la figure 3 dans la bande UHF pour α1 = 0° et α2 = 90°, avec un circuit d'adaptation.
  • Figure 9 représente respectivement en A une vue de dessus et en B une vue schématique en perspective d'un second mode de réalisation d'un système d'antennes conforme à la présente invention.
  • Figure 10 représente les diagrammes de rayonnement pour le système de la figure 9 avec un angle α égal à 135°, respectivement pour une alimentation sur le port 1 et pour une alimentation sur le port 2.
  • Figure 11 représente les diagrammes de rayonnement pour le système d'antennes de la figure 9 lorsque l'angle a est égal à 90° respectivement pour une alimentation sur le port 1 et sur le port 2.
  • Figure 12 représente une vue schématique en perspective d'un système d'antennes conforme à celui de la figure 9 avec respectivement en A un angle α = α1 = α2 = 90° et en B un angle α= α1 = α2 = 135°.
  • Figure 13 représente respectivement les courbes d'adaptation et d'isolation du système d'antennes représenté à la figure 12, respectivement en A pour un angle α = 90° et en B pour une angle α = 135°.
  • Figure 14 représente les courbes d'adaptation et d'isolation du système d'antennes de la figure 12 avec circuit d'adaptation, respectivement en A pour un angle α = 90° et en B pour un angle α= 135°.
  • Figure 15 représente les courbes de rendement du système d'antennes de la figure 12.
  • Figure 16 représente les courbes de gain du système d'antennes de la figure 12.
  • Figure 17 représente un autre mode de réalisation d'un système d'antennes conforme à la présente invention.
  • Figure 18 représente les résultats de simulation obtenus pour un système d'antennes tel que représenté à la figure 17.
  • Figure 19 représente schématiquement en perspective encore un autre mode de réalisation d'un système d'antennes conforme à la présente invention.
  • Figure 20 représente en A une vue de dessus et en B une vue schématique en perspective d'un autre mode de réalisation d'un système d'antennes conforme à la présente invention.
  • Figure 21 représente schématiquement une carte électronique utilisée avec un système d'antennes conforme à la présente invention.
  • Figure 22 représente en perspective un support pour le système d'antennes conforme à l'invention.
  • Figure 23 représente une vue en perspective agrandie du support de figure 22.
Other characteristics and advantages of the present invention will appear on reading the description of various embodiments, this description being made with reference to the attached drawings in which:
  • Figure 1 is a schematic perspective view of an antenna as described in the French patent application 05-51009 in the name of the plaintiff.
  • Figure 2 represents the radiation patterns in gain of the antenna of figure 1 for the different positions of the second arm.
  • Figure 3 is a schematic perspective view of a first embodiment of an antenna system according to the present invention.
  • Figure 4 represents the adaptation and isolation curves without adaptation circuit for an antenna system according to the figure 3 .
  • Figure 5 represents the adaptation and isolation curves with an adaptation circuit for an antenna system according to the figure 3 .
  • Figure 6 represents the radiation patterns of an antenna system according to the figure 3 respectively for an angle α1 = 0 ° and for an angle α2 = 90 °.
  • Figure 7 represents the performance of the antenna system of the figure 3 in the UHF band for α1 = 0 ° and α2 = 90 ° with an adaptation circuit.
  • Figure 8 represents the gain of the antenna system of the figure 3 in the UHF band for α1 = 0 ° and α2 = 90 °, with an adaptation circuit.
  • Figure 9 represents in A respectively a view from above and in B a schematic perspective view of a second embodiment of an antenna system according to the present invention.
  • Figure 10 represents the radiation patterns for the system of the figure 9 with an angle α equal to 135 °, respectively for a power supply on port 1 and for a power supply on port 2.
  • Figure 11 represents the radiation patterns for the antenna system of the figure 9 when the angle is equal to 90 ° respectively for a power supply on port 1 and on port 2.
  • Figure 12 represents a schematic perspective view of an antenna system in accordance with that of the figure 9 with respectively an angle α = α1 = α2 = 90 ° and at B an angle α = α1 = α2 = 135 °.
  • Figure 13 represents respectively the adaptation and isolation curves of the antenna system shown in figure 12 respectively at A for an angle α = 90 ° and at B for an angle α = 135 °.
  • Figure 14 represents the adaptation and isolation curves of the antenna system of the figure 12 with matching circuit, respectively at A for an angle α = 90 ° and at B for an angle α = 135 °.
  • Figure 15 represents the performance curves of the antenna system of the figure 12 .
  • Figure 16 represents the gain curves of the antenna system of the figure 12 .
  • Figure 17 represents another embodiment of an antenna system according to the present invention.
  • Figure 18 represents the simulation results obtained for an antenna system as shown in FIG. figure 17 .
  • Figure 19 schematically shows in perspective yet another embodiment of an antenna system according to the present invention.
  • Figure 20 represents in A a view from above and B is a schematic perspective view of another embodiment of an antenna system according to the present invention.
  • Figure 21 schematically represents an electronic card used with an antenna system according to the present invention.
  • Figure 22 represents in perspective a support for the antenna system according to the invention.
  • Figure 23 represents an enlarged perspective view of the support of figure 22 .

On décrira tout d'abord avec référence aux figures 1 et 2, un mode de réalisation d'une antenne de type dipôle utilisable pour la réception de la télévision numérique terrestre sur un ordinateur portable conforme à la demande de brevet français n° 05 51009 au nom de la demanderesse.We will first describe with reference to figures 1 and 2 , an embodiment of a dipole type antenna usable for the reception of digital terrestrial television on a laptop computer in accordance with the French patent application no. 05 51009 in the name of the plaintiff.

Comme représenté sur la figure 1, cette antenne de type dipôle comporte un premier bras 1 conducteur et un second bras 2 conducteur, les deux bras étant reliés l'un à l'autre par l'intermédiaire d'une zone d'articulation 3 située à l'une des extrémités de chacun des bras. De manière plus spécifique, le bras 1 présente sensiblement la forme d'un boîtier avec une partie 1a de forme sensiblement rectangulaire se prolongeant par une partie incurvée 1b s'évasant progressivement de manière à permettre à l'énergie d'être rayonnée progressivement favorisant ainsi l'adaptation sur une plus large bande de fréquences. La longueur du bras 1 est sensiblement égale à λ/4 où λ représente la longueur d'onde à la fréquence centrale de fonctionnement. Ainsi, la longueur du bras 1 est proche de 112 mm pour un fonctionnement dans la bande UHF (bande comprise entre 470 et 862 MHz).As shown on the figure 1 this dipole antenna comprises a first conducting arm 1 and a second conducting arm 2, the two arms being connected to each other via a hinge zone 3 located at one of the ends of each of the arms. More specifically, the arm 1 has substantially the shape of a housing with a portion 1a of substantially rectangular shape extending by a curved portion 1b flaring gradually to allow the energy to be radiated gradually favoring thus adapting to a wider frequency band. The length of the arm 1 is substantially equal to λ / 4 where λ represents the wavelength at the central operating frequency. Thus, the length of the arm 1 is close to 112 mm for operation in the UHF band (band between 470 and 862 MHz).

Comme représenté sur la figure 1, l'antenne comporte un second bras 2 monté à rotation autour de l'axe 3 qui représente aussi le point de connexion de l'antenne au circuit de traitement du signal. La connexion électrique de l'antenne est réalisée par un brin métallique, par exemple un câble coaxial ou similaire tandis que l'axe de rotation est réalisé en un matériau relativement transparent aux ondes électromagnétiques. Sur la figure 1, on a représenté différentes orientations pour le bras 2, à savoir une première orientation pour laquelle le bras 2 fait une angle α = 0° par rapport à l'horizontal référencée 20, une seconde orientation avec un angle α = 30° référencée 21, une troisième orientation avec un angle a = 45° référencée 22, une quatrième orientation avec un angle α = 60° référencée 23 et une cinquième orientation avec un angle α = 90° référencée 24. Le bras 2 dont la longueur est sensiblement égale à λ/4, présente un profil incurvé suivi d'une partie rectangulaire plane, permettant de replier le bras 2 complètement contre le bras 1 en position fermée. Le bras 2 étant monté en rotation par rapport au bras 1, cela permet de modifier l'orientation du bras 2 de manière à optimiser la réception du signal de télévision.As shown on the figure 1 , the antenna comprises a second arm 2 mounted to rotate about the axis 3 which also represents the connection point of the antenna to the signal processing circuit. The electrical connection of the antenna is made by a metal wire, for example a coaxial cable or the like while the axis of rotation is made of a material relatively transparent to electromagnetic waves. On the figure 1 different orientations for the arm 2 have been represented, namely a first orientation for which the arm 2 makes an angle α = 0 ° relative to the horizontal referenced 20, a second orientation with an angle α = 30 ° referenced 21, a third orientation with an angle α = 45 ° referenced 22, a fourth orientation with an angle α = 60 ° referenced 23 and a fifth orientation with an angle α = 90 ° referenced 24. The arm 2 whose length is substantially equal to λ / 4, has a curved profile followed by a rectangular flat portion, for folding the arm 2 completely against the arm 1 in the closed position. The arm 2 being rotatably mounted relative to the arm 1, this makes it possible to modify the orientation of the arm 2 so as to optimize the reception of the television signal.

Sur la figure 2, on a représenté le diagramme de rayonnement simulé d' une antenne conforme à celle représentée à la figure 1 à une fréquence de 660 MHz pour les différentes positions du bras 2 représentées sur la figure 1. Les diagrammes de rayonnement sont inclinés en fonction de l'angle d'inclinaison du bras. Cette inclinaison permet donc d'optimiser la réception du signal de télévision numérique.On the figure 2 , the simulated radiation pattern of an antenna conforming to that shown in FIG. figure 1 at a frequency of 660 MHz for the different positions of the arm 2 represented on the figure 1 . The radiation patterns are inclined according to the angle of inclination of the arm. This inclination thus makes it possible to optimize the reception of the digital television signal.

On expliquera maintenant avec référence aux figures 3 à 8, un premier mode de réalisation d'un système d'antennes à diversité conforme à la présente invention réalisé en utilisant le principe de l'antenne décrite avec référence aux figures 1 et 2.We will now explain with reference to Figures 3 to 8 , a first embodiment of a diversity antenna system according to the present invention realized using the principle of the antenna described with reference to figures 1 and 2 .

Comme représenté sur la figure 3, un système d'antennes conforme à la présente invention comporte deux antennes constituées d'un premier bras commun 10 formant au moins le capot 10a d'une carte électronique permettant de traiter le signal reçu par l'antenne. Dans le mode de réalisation représenté, le bras commun 10 comporte une partie supérieure ou élément formant capot 10a et une partie inférieure 10b, l'ensemble formant un boîtier pour recevoir une carte électronique de traitement des signaux reçus. Des simulations ont été réalisées sur un système tel que représenté à la figure 3 et présentant les caractéristiques suivantes : 1) le matériau utilisé est du cuivre de conductivité 4.9*10e7S/m, 2) la longueur du bras 11 est approximativement égale à 112mm, 3) le rayon de courbure utilisé pour les parties 10a, 10b, 11, 12 est de 31 mm, 4) la largeur des bras 10, 11 et 12 est d'environ 25mm de manière à pourvoir insérer la carte électronique de largeur 20mm. Les résultats obtenus lors de la simulation réalisée de manière connue en utilisant le logiciel IE3D, sont donnés sur les figures 4 à 8.As shown on the figure 3 , an antenna system according to the present invention comprises two antennas consisting of a first common arm 10 forming at least the cover 10a of an electronic card for processing the signal received by the antenna. In the embodiment shown, the common arm 10 has an upper portion or cover member 10a and a lower portion 10b, the assembly forming a housing for receiving an electronic card processing the received signals. Simulations were performed on a system as shown in figure 3 and having the following characteristics: 1) the material used is copper of conductivity 4.9 * 10 e 7S / m, 2) the length of arm 11 is approximately equal to 112mm, 3) the radius of curvature used for parts 10a, 10b , 11, 12 is 31 mm, 4) the width of the arms 10, 11 and 12 is about 25mm so as to insert the electronic card width 20mm. The results obtained during the simulation carried out in a known manner using the IE3D software are given on the Figures 4 to 8 .

La figure 4 représente les courbes d'adaptation S(1,1) et S(2,2) et la courbe d'isolation S(2,1) du système d'antennes de la figure 3 lorsque les seconds bras forment par rapport au premier bras un angle δ1 = 0° et α2 = 90°, à savoir pour un second bras 11 orienté selon l'horizontale et un second bras 12 orienté selon la verticale par rapport au premier bras 10, les courbes sont simulées avec un système sans cellule d'adaptation. Dans ce cas, les courbes montrent que l'adaptation est réalisée sur une bande relativement étroite qui peut être améliorée en utilisant une cellule d'adaptation. Cette cellule est constituée de manière classique par un circuit LC. Les courbes d'adaptation et d'isolation avec cellule d'adaptation sont représentées sur la figure 5. Dans ce cas, l'adaptation est réalisée sur une bande de fréquence plus importante.The figure 4 represents the adaptation curves S (1,1) and S (2,2) and the isolation curve S (2,1) of the antenna system of the figure 3 when the second arms form with respect to the first arm an angle δ1 = 0 ° and α2 = 90 °, namely for a second arm 11 oriented according to the horizontal and a second arm 12 oriented vertically relative to the first arm 10, the curves are simulated with a system without adaptation cell. In this case, the curves show that the adaptation is performed on a relatively narrow band that can be improved by using an adaptation cell. This cell is conventionally constituted by an LC circuit. Adaptation and isolation curves with adaptation cell are represented on the figure 5 . In this case, the adaptation is performed on a larger frequency band.

L'isolation entre la première antenne formée du premier bras 10 et du second bras 11 et la seconde antenne formée du premier bras 10 et du second bras 12, reste suffisante pour apporter un gain de diversité notable, notamment en tenant compte des polarisations verticale pour la première antenne et horizontale pour la seconde antenne ainsi que des fortes décorrélations de diagramme de rayonnement comme cela est représenté sur la figure 6.The insulation between the first antenna formed of the first arm 10 and the second arm 11 and the second antenna formed of the first arm 10 and the second arm 12 remains sufficient to provide a significant gain in diversity, especially taking into account the vertical polarizations for the first antenna and horizontal for the second antenna as well as strong decorrelations of radiation pattern as shown on the figure 6 .

Les diagrammes de rayonnement de la figure 6 montrent un découplage maximal et une décorrélation optimale entre les deux accès lorsque les deux secondes branches 11, 12 sont positionnées perpendiculairement l'une par rapport à l'autre. Ainsi, selon une caractéristique avantageuse de la présente invention, les deux bras 11 et 12 sont maintenus à des positions perpendiculaires l'un par rapport à l'autre quelque soit l'angle α de la première antenne, par exemple à savoir de l'antenne constituée par le premier bras commun 10 et le second bras 11.The radiation patterns of the figure 6 show a maximum decoupling and an optimal decorrelation between the two accesses when the two second branches 11, 12 are positioned perpendicularly with respect to each other. Thus, according to an advantageous characteristic of the present invention, the two arms 11 and 12 are held at positions perpendicular to each other whatever the angle α of the first antenna, for example to say antenna constituted by the first common arm 10 and the second arm 11.

La figure 7 représente le rendement d'un système d'antennes tel que représenté à la figure 3 pour des angles α1 = 0° et α2 = 90° sur toute α2 bande UHF tandis que la figure 8 représente le gain des deux accès pour le même système d'antennes. Dans ce cas, le rendement du système d'antennes est supérieur à 50% sur pratiquement toute la bande UHF, ce qui répond aux performance s souhaitées. Un gain moyen autour de 0dBi sur toute la bande UHF correspond à une directivité de 3dBi pour ce type d'antennes avec un rendement de 50%.The figure 7 represents the efficiency of an antenna system as represented in figure 3 for angles α1 = 0 ° and α2 = 90 ° on any α2 UHF band while the figure 8 represents the gain of both accesses for the same antenna system. In this case, the efficiency of the antenna system is greater than 50% over almost the entire UHF band, which meets the desired performance. An average gain around 0 dBi over the entire UHF band corresponds to a 3dBi directivity for this type of antenna with a yield of 50%.

On décrira maintenant avec référence aux figures 9 à 11, un autre mode de réalisation d'un système d'antennes conforme à la présente invention.We will now describe with reference to Figures 9 to 11 , another embodiment of an antenna system according to the present invention.

Comme représenté sur la figure 9, le système d'antennes comporte deux antennes de type dipôle formées d'un premier bras 20 commun aux deux antennes. Chaque antenne comporte un second bras 21, 22 monté à rotation à une extrémité du premier bras. Chaque second bras 21, 22 pivote de manière indépendante autour de deux axes de rotation 23, 24 distincts. Dans ce mode de réalisation, les deux bras 21, 22 peuvent former les parois latérales du premier bras commun 20, comme cela sera expliqué plus en détail ci-après.As shown on the figure 9 , the antenna system comprises two dipole type antennas formed of a first arm 20 common to the two antennas. Each antenna has a second arm 21, 22 rotatably mounted at one end of the first arm. Each second arm 21, 22 pivots independently around two axes of rotation 23, 24 separate. In this embodiment, the two arms 21, 22 can form the side walls of the first common arm 20, as will be explained in more detail below.

Comme dans le mode de réalisation précédent, le premier bras commun 20 comporte une partie rectangulaire 20a formant boîtier pour une carte électronique destinée, par exemple, au traitement de signaux électromagnétiques reçus ou émis par le système d'antennes. La partie rectangulaire 20a se prolonge par une partie 20b incurvée s'évasant progressivement. Les deux seconds bras 21, 22 présentent un profil adapté aux parties latérales du premier bras conducteur 20. De manière plus précise, elles présentent une partie sensiblement rectangulaire se prolongeant par une partie incurvée.As in the previous embodiment, the first common arm 20 comprises a rectangular portion 20a forming a housing for an electronic card for, for example, the processing of electromagnetic signals received or transmitted by the antenna system. The rectangular portion 20a is extended by a curved portion 20b flaring out gradually. The two second arms 21, 22 have a profile adapted to the side portions of the first conductive arm 20. More specifically, they have a substantially rectangular portion extending through a curved portion.

Comme représenté sur la partie A de la figure 9, les bras 21 et 22 peuvent s'orienter par rapport au premier bras 20 selon des angles α1 et α2 qui représentent donc l'angle d'ouverture entre respectivement le second bras 22 et le bras 20 et le second bras 21 et le bras 20. Les deux axes de rotation 23 et 24 étant éloignés l'un de l'autre, on observe, en plus d'une diversité de rayonnement, une diversité spatiale liée à la séparation spatiale des deux antennes formées par les dipôles 21, 20 et 22, 20.As shown in Part A of the figure 9 , the arms 21 and 22 can be oriented relative to the first arm 20 at angles α1 and α2 which therefore represent the opening angle between respectively the second arm 22 and the arm 20 and the second arm 21 and the arm 20 Since the two axes of rotation 23 and 24 are distant from each other, a spatial diversity is observed, in addition to a diversity of radiation, related to the spatial separation of the two antennas formed by the dipoles 21, 20 and 22, 20.

Cela s'observe notamment sur les diagrammes de rayonnement des figures 10 et 11 qui représentent respectivement les diagrammes de rayonnement pour le port 1 et le port 2 pour un écartement α = α1 = α2 = 135° entre les deux bras 20, 21 et 20, 22 sur la figure 10 et pour un écartement α = α1 = α2 = 90° entre les deux bras 20, 21 et 20, 22 sur la figure 11.This can be observed in particular on the radiation diagrams of figures 10 and 11 which respectively represent the radiation patterns for the port 1 and the port 2 for a spacing α = α1 = α2 = 135 ° between the two arms 20, 21 and 20, 22 on the figure 10 and for a spacing α = α1 = α2 = 90 ° between the two arms 20, 21 and 20, 22 on the figure 11 .

Sur la figure 12, on a représenté de manière plus précise en A un système d'antennes comportant un premier bras commun 20 et deux seconds bras 21, 22, les seconds bras étant positionnés par rapport au premier bras de sorte que l'angle α = α1 = α2 = 90°. De même, en B, on a représenté un système d'antennes identique mais, dans ce cas l'angle α = α1 = α2 = 135°. Les deux seconds bras 21 et 22 étant montés à rotation autour de deux axes distincts 23, 24 prévus à l'extrémité du premier bras 20, il est possible de les faire tourner de manière à ce qu'en position non utilisée, les deux bras 21, 22 se replient sur les faces latérales du premier bras commun 20 donnant un système compact facilement transportable lorsqu'il n'est pas utilisé.On the figure 12 a system of antennas having a first common arm 20 and two second arms 21, 22 is represented more precisely in A, the second arms being positioned relative to the first arm so that the angle α = α1 = α2 = 90 °. Similarly, in B, there is shown an identical antenna system but, in this case the angle α = α1 = α2 = 135 °. The two second arms 21 and 22 being rotatably mounted around two separate axes 23, 24 provided at the end of the first arm 20, it is possible to rotate them so that in the unused position, the two arms 21, 22 fold on the lateral faces of the first common arm 20 giving a compact system easily transportable when not in use.

La figure 13 représente donc pour le système de la figure 12 respectivement les courbes d'adaptation et d'isolation entre les deux antennes sans circuit d'adaptation pour un angle α= 90° en A et α= 135° en B. L'antenne présente une adaptation naturelle autour de la fréquence centrale de fonctionnement mais pas sur la totalité de la bande UHF pour les deux valeurs de α. La différence d'isolation pour les deux valeurs de α est proportionnelle à la corrélation des diagrammes du système d'antennes. Cela permet en fonction du canal fréquentiel utilisé d'ajuster l'isolation et donc d'améliorer l'effet recherché par l'utilisation de la diversité.The figure 13 therefore represents for the system the figure 12 respectively the adaptation and isolation curves between the two antennas without an adaptation circuit for an angle α = 90 ° in A and α = 135 ° in B. The antenna has a natural adaptation around the central operating frequency but not on the entire UHF band for both values of α. The isolation difference for the two values of α is proportional to the correlation of the antenna system diagrams. This makes it possible, depending on the frequency channel used, to adjust the insulation and thus to improve the desired effect by using diversity.

De même la figure 14 représente les courbes d'adaptation et d'isolation entre les deux antennes respectivement pour un angle α= 90° en A et α= 135° en B dans le cas où un circuit d'adaptation est connecté en sortie du système d'antennes. Le circuit d'adaptation permet ici d'élargir la largeur de bande d'adaptation considérée pour un niveau de S11 à -6dB, ce qui est une valeur typique pour l'application visée. La remarque concernant l'isolation de la figure 13 s'applique également ici.Likewise figure 14 represents the adaptation and isolation curves between the two antennas respectively for an angle α = 90 ° in A and α = 135 ° in B in the case where an adaptation circuit is connected at the output of the antenna system. The adaptation circuit here makes it possible to widen the adaptation bandwidth considered for a level of S11 to -6 dB, which is a value that is typical for the intended application. The remark concerning the insulation of the figure 13 also applies here.

La figure 15 représente les courbes de rendement du système tandis que la figure 16 représente les courbes de gain pour les deux antennes du système d'antennes décrit ci-dessus. Le rendement du système d'antennes est supérieur à 60% sur pratiquement toute la bande UHF, ce qui traduit une bonne performance pour l'application visée. Un gain moyen autour de 0.5dBi sur toute la bande UHF correspond à une directivité de 3dBi pour ce type d'antennes avec un rendement de 60%.The figure 15 represents the system yield curves while the figure 16 represents the gain curves for the two antennas of the antenna system described above. The performance of the antenna system is greater than 60% over almost the entire UHF band, which reflects a good performance for the intended application. An average gain around 0.5dBi over the entire UHF band corresponds to a directivity of 3dBi for this type of antennas with a yield of 60%.

On décrira maintenant avec référence aux figures 17 et 18, un autre mode de réalisation d'un système d'antennes conforme à la présente invention. Dans ce cas, le premier bras ou bras commun 30 a une forme sensiblement elliptique avec un axe principal x, x. Près d'une extrémité de l'axe principal x, x sont montés autour de deux axes distincts 33, 34 les deux seconds bras 31, 32 des deux antennes de type dipôle. Ces deux bras présentent la forme d'une demie ellipse. Les deux bras 31, 32 sont montés à rotation de manière à pouvoir se replier respectivement sur la face supérieure et la face inférieure du bras commun 30. Un système à deux antennes de ce type a été simulé et la figure 18 donne les courbes d'adaptation et d'isolation d'une telle antenne. Les caractéristiques utilisées pour la simulation sont les suivantes : 1) le matériau utilisé est du cuivre de conductivité 4.9*10e7S/m, 2) les deux axes de l'ellipse pour les éléments 30, 31 et 32 ont pour dimensions, respectivement 25mm et 50mm, 3) l'épaisseur du boîtier est de 12mm, ce qui permet d'y insérer la carte électronique d'épaisseur de 10mm.We will now describe with reference to Figures 17 and 18 , another embodiment of an antenna system according to the present invention. In this case, the first arm or common arm 30 has a shape substantially elliptical with a main axis x, x. Near one end of the main axis x, x are mounted around two distinct axes 33, 34 the two second arms 31, 32 of the two dipole type antennas. These two arms have the shape of a half ellipse. The two arms 31, 32 are rotatably mounted so as to be able to fold respectively on the upper face and the lower face of the common arm 30. A system with two antennas of this type has been simulated and the figure 18 gives the adaptation and isolation curves of such an antenna. The characteristics used for the simulation are as follows: 1) the material used is copper of conductivity 4.9 * 10 e 7S / m, 2) the two axes of the ellipse for the elements 30, 31 and 32 have dimensions, respectively 25mm and 50mm, 3) the thickness of the housing is 12mm, which allows to insert the electronic card thickness of 10mm.

On décrira maintenant avec référence aux figures 19 et 20 d'autres modes de réalisation d'un système d'antennes du même type que celui représenté à la figure 9.We will now describe with reference to figures 19 and 20 other embodiments of an antenna system of the same type as that shown in figure 9 .

Sur la figure 19, le système d'antennes à diversité conforme à la présente invention comporte un premier bras commun 40 présentant une forme de boîtier oblong. A l'extrémité du boîtier 40 sont prévus deux axes distincts 43, 44 sur lesquels sont montés respectivement un premier second bras 41 et un deuxième second bras 42 pour obtenir les deux antennes de type dipôle formant le système d'antennes-conforme à l'invention. Ces bras 41 et 42 de forme oblongue peuvent tourner autour des axes 43 et 44 et se rabattre sur les côtés latéraux du premier bras commun 40 formant boîtier.On the figure 19 , the diversity antenna system according to the present invention comprises a first common arm 40 having an oblong housing shape. At the end of the housing 40 are provided two separate axes 43, 44 on which are respectively mounted a first second arm 41 and a second second arm 42 to obtain the two dipole antennas forming the antenna system-compliant with the invention. These arms 41 and 42 of oblong shape can rotate about the axes 43 and 44 and fall back on the lateral sides of the first common arm 40 forming a housing.

Sur la figure 20, on a représenté une autre variante de réalisation d'un système d'antennes conforme à la présente invention. Dans ce cas, le système comporte un premier bras 50 commun. Ce bras a une forme identique au premier bras 30 du mode de réalisation de la figure 9. A l'extrémité évasée du bras 50 sont prévus deux axes de rotation distincts 53, 54 sur lesquels sont montés respectivement un premier second bras 51 et un deuxième second bras 52. Le premier second bras 51 présente une partie pouvant se rabattre sur la face latérale du premier bras 50. Cette partie 51 se prolonge perpendiculairement par un élément rectangulaire 51' venant se rabattre sous le bras 50 tandis que le deuxième second bras 52 présente une partie principale 52 pouvant se rabattre sur l'autre face latérale de l'élément 50, cette partie 52 se prolongeant par une partie rectangulaire 52' perpendiculaire qui vient se rabattre sur la partie supérieure de l'élément 50.On the figure 20 another alternative embodiment of an antenna system according to the present invention is shown. In this case, the system comprises a first common arm 50. This arm has a shape identical to the first arm 30 of the embodiment of the figure 9 . At the flared end of the arm 50 are provided two distinct axes of rotation 53, 54 on which are respectively mounted a first second arm 51 and a second second arm 52. The first second arm 51 has a part that can be folded down on the side face of the first arm 50. This portion 51 is extended perpendicularly by a rectangular member 51 'to fall back under the arm 50 while the second second arm 52 has a main portion 52 can be folded on the another side face of the element 50, this portion 52 extending by a rectangular portion 52 'perpendicular which is folded down on the upper part of the element 50.

On décrira maintenant avec référence à la figure 21, un mode de réalisation d'une carte électronique pouvant s'intégrer dans le boîtier ou sous le capot formé par le premier bras commun du système conforme à la présente invention. Cette carte électronique comporte de manière schématique, un premier amplificateur LNA (Low Noise Amplifier ou «Amplificateur Faible Bruit ») 100 relié en 1A à une des antennes du système d'antennes conforme à la présente invention. L'amplificateur LNA 100 est connecté à un tuner 101 lui-même connecté à un démodulateur 102. En parallèle, la carte comporte un second amplificateur LNA 110 connecté en 1B à la seconde antenne. Le LNA 110 est connecté à un tuner 111 connecté à un démodulateur 112. Les deux démodulateurs 102 et 112 sont interconnectés de manière à avoir un démodulateur maître, à savoir 112 dans le mode de réalisation représenté et un démodulateur esclave, à savoir 102 dans le mode de réalisation représenté. La sortie du démodulateur maître 112 est reliée à une interface USB 120, elle-méme connectée à un connecteur USB 130 permettant de connecter le système d'antennes sur la prise USB d'un terminal portable tel qu'un ordinateur portable ou PC ou tout autre appareil du même type.We will now describe with reference to the figure 21 , an embodiment of an electronic card that can integrate into the housing or under the cover formed by the first common arm of the system according to the present invention. This electronic card schematically comprises a first amplifier LNA (Low Noise Amplifier or "Low Noise Amplifier") 100 connected in 1A to one of the antennas of the antenna system according to the present invention. The LNA amplifier 100 is connected to a tuner 101 itself connected to a demodulator 102. In parallel, the card comprises a second LNA amplifier 110 connected at 1B to the second antenna. The LNA 110 is connected to a tuner 111 connected to a demodulator 112. The two demodulators 102 and 112 are interconnected so as to have a master demodulator, namely 112 in the embodiment shown and a slave demodulator, namely 102 in the embodiment shown. The output of the master demodulator 112 is connected to a USB interface 120, itself connected to a USB connector 130 for connecting the antenna system to the USB port of a portable terminal such as a laptop or PC or any other device. another device of the same type.

On décrira maintenant avec référence aux figures 22 et 23, un mode de réalisation d'un support pour le système d'antennes décrit ci-dessus. Comme représenté, le support comporte un élément 210 en forme de boîte pour recevoir le bras commun 10 du système d'antennes de la présente invention. L'élément 110 comporte une ouverture supérieure 211 adaptée pour recevoir ledit bras et une ouverture inférieure permettant la connexion à un connecteur de l'appareil portable tel qu'un connecteur USB. L'élément 210 est monté à rotation autour de l'axe 212 sur un moyen de fixation 200 permettant de fixer le support d'antennes sur un appareil, plus particulièrement sur l'écran 300 d'un ordinateur portable.We will now describe with reference to Figures 22 and 23 , an embodiment of a support for the antenna system described above. As shown, the carrier includes a box-like member 210 for receiving the common arm 10 of the antenna system of the present invention. The element 110 comprises an upper opening 211 adapted to receive said arm and a lower opening allowing the connecting to a connector on the portable device such as a USB connector. The element 210 is rotatably mounted about the axis 212 on a fixing means 200 for fixing the antenna support to a device, more particularly on the screen 300 of a laptop.

Le moyen de fixation 200 comporte un élément en L 201 sur lequel est monté l'élément en forme de boîte 210. La partie perpendiculaire de l'élément en L présente une ouverture 202 formant glissière. Dans cette glissière vient s'insérer un second élément 203 en L, les deux éléments en L 202 et 203 formant pince de serrage sur l'écran 300. L'élément 203 est muni sur sa partie s'insérant dans la glissière d'un trou oblong non représenté. Une fois en position, l'écartement entre l'élément 203 et l'élément 201 est maintenu par un moyen de serrage 204 tel qu'une vis de serrage ou similaire. D'autre part, pour maintenir efficacement le support sur l'écran, la partie libre du second élément en L est incurvée vers l'intérieur, renforçant l'effet de pince.The attachment means 200 comprises an L-shaped member 201 on which the box-shaped member 210 is mounted. The perpendicular portion of the L-shaped member has an opening 202 forming a slider. In this slide is inserted a second element 203 L, the two elements L 202 and 203 forming clamp on the screen 300. The element 203 is provided on its part fitting into the slide of a oblong hole not shown. Once in position, the spacing between the element 203 and the element 201 is maintained by a clamping means 204 such as a clamping screw or the like. On the other hand, to effectively maintain the support on the screen, the free portion of the second L-shaped member is curved inward, reinforcing the pincer effect.

Avec le dispositif décrit ci-dessus, un premier réglage permet de serrer le support sur le bord de l'écran de façon à s'ajuster sur tout type d'écran. Une fois la liaison mécanique établie entre l'écran 300 et le support, un deuxième réglage peut être opéré en faisant tourner l'élément 210 recevant le système d'antennes autour de l'axe 212 pour orienter les antennes de manière à optimiser la qualité de réception pour un canal donné.With the device described above, a first adjustment makes it possible to tighten the support on the edge of the screen so as to fit on any type of screen. Once the mechanical link is established between the screen 300 and the support, a second adjustment can be made by rotating the element 210 receiving the antenna system around the axis 212 to orient the antennas so as to optimize the quality reception for a given channel.

Claims (13)

  1. Diversity antennas system comprising at least two antennas of the dipole type each formed by a first and a second conductive arm, supplied differentially, characterized in that the two antennas comprise a common arm (10, 20, 30, 40, 50) called first arm forming at least one cover for an electronic card and each one a second arm (11,12; 21,22; 31,32; 41,42; 51,52) mounted in rotation at one extremity of the first arm.
  2. System according to claim 1, characterized in that the first arm (10, 20, 30, 40, 50) has the form of a box into which the electronic card is inserted.
  3. System according to one of claims 1 to 2, characterized in that the first and second arms each have a length noticeably equal to λ/4 where λ is the wavelength at the operating central frequency.
  4. System according to one of claims 1 to 3, characterized in that the second arms (11,12) are mounted in rotation at one extremity of the first arm (10) around a common axis (13).
  5. System according to claim 4, characterized in that the second arms have identical profiles and complementary to the profile of the first arm so as to be able to fold back onto one or several of the faces of the first arm.
  6. System according to one of claims 1 to 3, characterized in that each second arm (21,22; 31,32; 41,42; 51,52) is mounted in rotation at one extremity of the first arm (10) around a specific axis (23,24; 33,34; 43,44; 53,54).
  7. System according to claim 6, characterized in that the second arms (21,22) have identical profiles corresponding to the lateral walls of the box for electronic card formed by the first arm.
  8. System according to claim 6, characterized in that the second arms (31,32) have complementary profiles enabling them to be folded back onto one of the faces of the first arm.
  9. System according to one of claims 1 to 8, characterized in that the electronic card comprises, at one extremity, at least two connection ports (1 A, 1 B) for supplying each antenna and at the other extremity a connection port (130) to an electronic appliance.
  10. Support for an antenna system according to one of claims 1 to 9, characterized in that the support comprises an adjustable attachment means (200) on an appliance and a means (210) to receive one of the arms of the antenna system.
  11. Support according to claim 10, characterized in that the adjustable attachment means is constituted by two L-shaped elements (201,203) each sliding in the other in such a manner as to form an adjustable grip.
  12. Support according to one of claims 10 or 11, characterized in that the means for receiving one of the arms of the antenna system is constituted by an element (210) is the form of a box featuring at least one opening (211) to receive one of the arms of the antenna system.
  13. Support according to one of the aforementioned claims characterized in that the box-shaped element (210) is fixed in rotation (212) on the adjustable attachment means (200).
EP06764216A 2005-08-01 2006-07-19 System of diversity dipole antennas Active EP1911120B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0552401A FR2889362B1 (en) 2005-08-01 2005-08-01 DIPOLE TYPE DIVERSITY ANTENNA SYSTEM
PCT/EP2006/064415 WO2007014855A1 (en) 2005-08-01 2006-07-19 System of diversity dipole antennas

Publications (2)

Publication Number Publication Date
EP1911120A1 EP1911120A1 (en) 2008-04-16
EP1911120B1 true EP1911120B1 (en) 2012-03-28

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EP06764216A Active EP1911120B1 (en) 2005-08-01 2006-07-19 System of diversity dipole antennas

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US (1) US8310405B2 (en)
EP (1) EP1911120B1 (en)
JP (1) JP4864086B2 (en)
KR (1) KR101274170B1 (en)
CN (1) CN101263631B (en)
FR (1) FR2889362B1 (en)
WO (1) WO2007014855A1 (en)

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CN101263631A (en) 2008-09-10
KR20080033308A (en) 2008-04-16
KR101274170B1 (en) 2013-06-12
JP2009504042A (en) 2009-01-29
CN101263631B (en) 2012-05-02
WO2007014855A1 (en) 2007-02-08
FR2889362A1 (en) 2007-02-02
JP4864086B2 (en) 2012-01-25
EP1911120A1 (en) 2008-04-16
US20100207837A1 (en) 2010-08-19
FR2889362B1 (en) 2007-10-19
US8310405B2 (en) 2012-11-13

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