EP1518296B1 - Multiband planar antenna - Google Patents

Multiband planar antenna Download PDF

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Publication number
EP1518296B1
EP1518296B1 EP03761621A EP03761621A EP1518296B1 EP 1518296 B1 EP1518296 B1 EP 1518296B1 EP 03761621 A EP03761621 A EP 03761621A EP 03761621 A EP03761621 A EP 03761621A EP 1518296 B1 EP1518296 B1 EP 1518296B1
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EP
European Patent Office
Prior art keywords
radiator
frequency
slots
antenna
reflector
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EP03761621A
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German (de)
French (fr)
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EP1518296A1 (en
Inventor
Daniel Jacquinot
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Antennes Ft a Responsabilite Ltee Ste
Antennes FT Sarl
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Antennes Ft a Responsabilite Ltee Ste
Antennes FT Sarl
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
    • 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
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna

Definitions

  • the invention relates to a flat antenna with a wide bandwidth, of the patch antenna type, in particular for the transmission and / or reception of UHF / SHF signals of the digital terrestrial television and / or analogue type, comprising a reflector tuned to the low frequency of the bandwidth and a radiator connected to a specific power supply and radiating at a frequency F 1 , this radiator further having a slot tuned to a frequency F 2 .
  • terrestrial television signals whether digital and / or analog, have a frequency of approximately between 470 and 870 MHz. Precisely, unless using highly complex technical means, prior to the invention this frequency band could not be covered through a single patch type flat antenna.
  • planar antenna of patch type
  • a simple planar reflector made of conductive material, above which extends, separated by a dielectric substrate
  • a radiator in the form of a conductive plate whose dimensions are determined for, under the effect of a specific power supply, allow it to radiate at a specific frequency.
  • the reflector has increased dimensions relative to the radiator, it has the function of expanding the bandwidth of the antenna downwards. More precisely, this reflector, through its line of coupling with the radiator, is tuned to a low frequency, which is less than the radiation frequency of the radiator.
  • this slot antenna has the effect of expanding the bandwidth.
  • a conductive layer antenna and a dual-band transmission device including this antenna.
  • This comprises a dielectric substrate having on its lower and upper faces a conductive layer, the first constituting a mass, the reflector and the second a patch, the radiator, both of which are connected here by a short-circuit band. extending on a wafer surface of the substrate.
  • the antenna further comprises a coupling system comprising a primary coupling line formed by two slots extending parallel in the chip and constituting, respectively, two primary coupling slots, while a secondary coupling line formed by a third slot is connected to one of its two primary coupling slots.
  • the patch further includes a separator assembly including at least one separating slot so as to reveal two zones constituting, respectively, a primary resonance zone and a secondary resonance zone.
  • the separator assembly may be defined by a U-shaped separating slot, remaining at a distance from the edges of the pellet and having two branches connected to one another. by a base.
  • each of the separating slots constituting the U is the same, while the parallel end slots have a similar length.
  • the coupling between, on the one hand, the standing wave of each of the two primary and secondary resonances and, on the other hand, the waves radiated in space is mainly done on a or more of the edges of the patch or splits or through these slots. It is specified that in the embodiment comprising a U-shaped separation slot, the connecting slot constitutes an additional secondary radiative slot to the two other parallel slots.
  • the present invention by questioning the preconceived ideas in the field, has been able to provide a solution to the problem mentioned above.
  • the improvement of the bandwidth of a patch antenna through the present invention is significant since it makes it possible to obtain a widening of this band of the order of 100% with respect to the low frequency.
  • the invention relates to a flat antenna with a wide bandwidth, of the patch antenna type, in particular for the transmission and / or reception of UHF / SHF signals of the digital terrestrial television and / or analogue type, comprising a reflector granted at the low frequency of the bandwidth and a radiator connected to a specific power supply and radiating at a frequency F 1 , this radiator further having a slot tuned to a frequency F 2 , characterized in that the radiator comprises at least one other slot tuned to a different frequency F 3 at the frequencies F 1 and F 2 , these slots being connected by a defined link slot capable of constituting a coupling line for providing an electromagnetic current at each of the frequency slots F 2 and F 3 .
  • the slots that connect the connection slot, defining a coupling line are geometrically identical, while the supply of the radiator occurs asymmetrically between the slots to ensure the radiation of the latter according to the frequencies, respectively, F2 and F3 different.
  • these slots are defined of different dimensions to ensure their radiation at different frequencies F2 and F3.
  • the antenna comprises, disposed above the radiator and parallel to the latter, at least one parasitic element with smaller dimensions for broadening the bandwidth at the top of the band.
  • the reflector comprises at least two of its opposite peripheral edges folded in a plane which is perpendicular to it in the direction of the radiator.
  • the opposite peripheral edges folded are those crossing the plane of polarization of the radiator.
  • these folded peripheral edges extend in planes, which relative to the corresponding edges of the radiator, are at a distance smaller than that separating the plane of this radiator and that of the reflector.
  • the advantages of the present invention consist in a substantial widening of the bandwidth of a patch antenna, ie of the order of 100% of its low radiation frequency.
  • the present invention relates to a high bandwidth flat antenna for transmitting and / or receiving UHF and / or SHF signals, in particular digital terrestrial television signals. and / or analog.
  • This antenna 1 comprises a plane reflector 2 of metal material above which extends a radiator 3, also metallic, connected to a specific power supply 4.
  • a dielectric substrate separates the radiator 3 from the reflector 2 taking into account, in this respect, that the distance P between the latter is dependent on the permittivity of this substrate.
  • the radiator 3 in the form of a single-sided printed circuit 3a on a dielectric substrate 3b whose permittivity ⁇ r is greater than 1, it is possible to reduce the dimensions of the reflector 2 and, consequently, to obtain a smaller antenna.
  • the dimensions of the latter can be further reduced by folding, in a plane perpendicular to the radiator 3, at least two of the peripheral edges opposed 5, 6 of this reflector 2.
  • the radiator 3 comprises at least two slots 7, 8 tuned to frequencies, respectively, F 2 and F 3 different from each other and with respect to the radiation frequency F 1 of the radiator 3. Particularly these slots 7, 8 extend parallel to the polarization plane of the radiator 3.
  • the slots 7, 8 may be defined in different dimensions to ensure their radiation at different frequencies F2 and F3.
  • their radiation at different frequencies F2 and F3 results from an asymmetrical power supply between said slots, knowing that the invention still extends to a solution combining one and the other of these modes of production.
  • each of these slots 7, 8 are connected through a bonding slot 9 defined capable of constituting a coupling line.
  • a gain at the top of the band is still obtained by the superposition to the radiator 3 of at least one parasitic element 10, with dimensions smaller than the radiator 3 and extending substantially above the slots 7, 8.
  • the latter define, in the radiator 3, an electric polarization plane Pe and a magnetic polarization plane Pm perpendicular thereto.
  • the opposite peripheral edges 5, 6 of this reflector 2 which are folded at right angles towards the radiator are those cut by this magnetic plane Pm.
  • the radiator 3 is loaded by bringing the folded peripheral edges 5, 6 of the reflector 2 closer to the corresponding edges 11, 12 of this radiator 3 by a distance d less than the aforementioned distance P. This results in a lowering of the low radiation frequency of the antenna 1.
  • this solution contributes, again, to a reduction in the size of the antenna 1 since the dimensions of the latter are determined by those of the reflector 2 moreover tuned to the low frequency of the bandwidth of said antenna 1.
  • the present invention must be considered as a clear progress in the technical field considered, since this range of frequencies of television signals Digital terrestrial and / or analog could only be hitherto covered by the use of several flat patch antennas.

Abstract

The invention concerns a planar broadband patch antenna, in particular for transmitting and/or receiving digital and/or analogue terrestrial television UHF/SHF signals, having a bandwidth low frequency tuned reflector and a radiator connected to a specific power supply and radiating in a frequency F 1 . The radiator also has a slot tuned to a frequency F 2 . The antenna is characterized in that the radiator has another slot tuned to a frequency F 3 different from frequencies F 1 and F 2 , the slots being connected through a linking slot designed to constitute a coupling line to provide a substantially identical electromagnetic current at each of the slots of frequency F 2 , F 3 , respectively.

Description

L'invention a trait à une antenne plane à large bande passante, du type antenne patch, notamment pour l'émission et/ou la réception de signaux UHF/SHF de type télévision terrestre numérique et/ou analogique, comportant un réflecteur accordé à la fréquence basse de la bande passante et un radiateur raccordé à une alimentation spécifique et rayonnant selon une fréquence F1, ce radiateur présentant encore une fente accordée à une fréquence F2.The invention relates to a flat antenna with a wide bandwidth, of the patch antenna type, in particular for the transmission and / or reception of UHF / SHF signals of the digital terrestrial television and / or analogue type, comprising a reflector tuned to the low frequency of the bandwidth and a radiator connected to a specific power supply and radiating at a frequency F 1 , this radiator further having a slot tuned to a frequency F 2 .

Il est, d'ores et déjà, connu un certain nombre d'antennes planes de type patch dont on a cherché depuis de longue date à élargir la bande passante pour permettre la réception d'ondes dans une large gamme de fréquence à l'aide d'une seule et même antenne.It is already known a number of planar patch antennas which have been sought for long time to expand the bandwidth to allow the reception of waves in a wide range of frequency using from one and the same antenna.

A ce propos, l'on remarquera que les signaux terrestres de télévision qu'ils soient numériques et/ou analogiques ont une fréquence comprise, approximativement, entre 470 et 870 MHz. Précisément, à moins de mettre en oeuvre des moyens techniques fort complexes, antérieurement à l'invention cette bande de fréquence ne pouvait pas être couverte au travers d'une seule et même antenne plane de type patch.In this connection, it will be noted that terrestrial television signals, whether digital and / or analog, have a frequency of approximately between 470 and 870 MHz. Precisely, unless using highly complex technical means, prior to the invention this frequency band could not be covered through a single patch type flat antenna.

Plus particulièrement, en matière d'antenne plane, de type patch, il est connu celle composée d'un simple réflecteur plan en matériau conducteur, au-dessus duquel s'étend, séparé par un substrat diélectrique, un radiateur sous forme d'une plaque conductrice dont les dimensions sont déterminées pour, sous l'effet d'une alimentation spécifique, lui permettre de rayonner à une fréquence déterminée.More particularly, in the case of planar antenna, of patch type, it is known that composed of a simple planar reflector made of conductive material, above which extends, separated by a dielectric substrate, a radiator in the form of a conductive plate whose dimensions are determined for, under the effect of a specific power supply, allow it to radiate at a specific frequency.

Si le réflecteur dispose de dimensions accrues par rapport au radiateur, il a pour fonction d'élargir la bande passante de l'antenne vers le bas. Plus précisément, ce réflecteur, au travers de sa ligne de couplage avec le radiateur, s'accorde à une fréquence basse, soit inférieure à la fréquence de rayonnement du radiateur.If the reflector has increased dimensions relative to the radiator, it has the function of expanding the bandwidth of the antenna downwards. More precisely, this reflector, through its line of coupling with the radiator, is tuned to a low frequency, which is less than the radiation frequency of the radiator.

Pour élargir la bande passante vers le haut, il a été imaginé de superposer au radiateur des éléments conducteurs plan parasites, non alimentés. Par l'intermédiaire de leur ligne de couplage avec le radiateur, ces éléments parasites ont pour effet de rayonner en haut de bande passante.To widen the bandwidth upwards, it has been imagined to superimpose on the radiator parasitic planar, non-powered elements. Through their coupling line with the radiator, these parasitic elements have the effect of radiating high bandwidth.

Dans une conception plus récente, il a été réalisé une antenne patch dont la plaque radiateur, alimentée par une ligne d'alimentation spécifique, s'accorde à une première fréquence, sachant que dans cette plaque est découpée une fente en U de largeur constante qui résonne à une fréquence différente.In a more recent design, it has been realized a patch antenna whose radiator plate, powered by a specific supply line, is tuned to a first frequency, knowing that in this plate is cut a U-shaped slot of constant width which resonates at a different frequency.

Evidemment, couplée à la fréquence de rayonnement du radiateur, cette antenne à fente a pour conséquence d'élargir la bande passante.Obviously, coupled to the radiation frequency of the radiator, this slot antenna has the effect of expanding the bandwidth.

La configuration en U de la fente et sa disposition symétrique par rapport au plan médian transversal au radiateur, tout comme l'alimentation s'effectuant dans ce plan transversal ont été jugés comme des paramètres indispensables pour permettre l'alimentation en courant électromagnétique de cette fente.The U-shaped configuration of the slot and its symmetrical arrangement with respect to the median plane transverse to the radiator, as well as the supply taking place in this transverse plane, have been judged as essential parameters to allow the electromagnetic current supply of this slot. .

En somme, une simple fente rectiligne pratiquée dans ce radiateur ne peut être soumise à un courant électromagnétique sous l'effet d'une alimentation simplement raccordée au radiateur.In short, a simple straight slot made in this radiator can not be subjected to an electromagnetic current under the effect of a supply simply connected to the radiator.

Bien évidemment, une telle fente en U de largeur constante ne peut rayonner que sur sa résonance fondamentale.Of course, such a U-shaped slit of constant width can radiate only on its fundamental resonance.

En conclusion, les solutions adoptées jusqu'à présent ont permis un élargissement de la bande passante d'une antenne patch de l'ordre de 20 à 40 % par rapport à sa fréquence de rayonnement fondamentale, ceci, bien sûr, pour une réception avec un gain suffisant permettant l'exploitation du signal perçu.In conclusion, the solutions adopted so far have allowed a broadening of the bandwidth of a patch antenna of the order of 20 to 40% compared to its fundamental radiation frequency, this, of course, for a reception with a sufficient gain allowing the exploitation of the perceived signal.

Il est encore connu par le document US-2002/003499, une antenne à couche conductrice et un dispositif de transmission bi-bande incluant cette antenne. Celle-ci comporte un substrat diélectrique comportant sur ses faces inférieure et supérieure une couche conductrice, la première constituant une masse, le réflecteur et la seconde un patch, le radiateur, les deux étant raccordées, ici, par une bande de court-circuit s'étendant sur une surface de tranche du substrat.It is still known from US-2002/003499, a conductive layer antenna and a dual-band transmission device including this antenna. This comprises a dielectric substrate having on its lower and upper faces a conductive layer, the first constituting a mass, the reflector and the second a patch, the radiator, both of which are connected here by a short-circuit band. extending on a wafer surface of the substrate.

Dans ce cas, l'antenne comporte encore un système de couplage comportant une ligne de couplage primaire formée par deux fentes s'étendant parallèlement dans la pastille et constituant, respectivement, deux fentes de couplage primaire, tandis qu'une ligne de couplage secondaire formée par une troisième fente se raccorde à l'une de ses deux fentes de couplage primaire.In this case, the antenna further comprises a coupling system comprising a primary coupling line formed by two slots extending parallel in the chip and constituting, respectively, two primary coupling slots, while a secondary coupling line formed by a third slot is connected to one of its two primary coupling slots.

Le patch inclut encore un ensemble séparateur incluant au moins une fente séparatrice de manière à faire apparaître deux zones constituant, respectivement, une zone de résonance primaire et une zone de résonance secondaire. En fait, selon un mode de réalisation particulier décrit dans ce document, l'ensemble séparateur peut être défini par une fente séparatrice de forme en U, restant à distance des bords de la pastille et comportant deux branches reliées l'une à l'autre par une base.The patch further includes a separator assembly including at least one separating slot so as to reveal two zones constituting, respectively, a primary resonance zone and a secondary resonance zone. In fact, according to a particular embodiment described in this document, the separator assembly may be defined by a U-shaped separating slot, remaining at a distance from the edges of the pellet and having two branches connected to one another. by a base.

On notera, tout particulièrement, que la largeur de chacune des fentes séparatrices constituant le U est la même, tandis que les fentes extrêmes parallèles comportent une longueur similaire.It will be noted, in particular, that the width of each of the separating slots constituting the U is the same, while the parallel end slots have a similar length.

Comme cela est exposé dans ce document antérieur, le couplage entre, d'une part, l'onde stationnaire de chacune des deux résonances primaire et secondaire et, d'autre part, les ondes rayonnées dans l'espace, se fait principalement sur un ou plusieurs des bords du patch ou des fentes séparatrices ou à travers ces fentes. Il est précisé que dans le mode de réalisation comportant une fente séparatrice en U la fente de liaison constitue une fente radiative secondaire additionnelle aux deux autres fentes parallèles.As explained in this prior document, the coupling between, on the one hand, the standing wave of each of the two primary and secondary resonances and, on the other hand, the waves radiated in space, is mainly done on a or more of the edges of the patch or splits or through these slots. It is specified that in the embodiment comprising a U-shaped separation slot, the connecting slot constitutes an additional secondary radiative slot to the two other parallel slots.

La présente invention, en remettant en cause les idées préconçues en la matière, a su apporter une solution au problème précité. L'amélioration de la bande passante d'une antenne patch au travers de la présente invention est significative puisqu'elle permet d'obtenir un élargissement de cette bande de l'ordre de 100% par rapport à la fréquence basse.The present invention, by questioning the preconceived ideas in the field, has been able to provide a solution to the problem mentioned above. The improvement of the bandwidth of a patch antenna through the present invention is significant since it makes it possible to obtain a widening of this band of the order of 100% with respect to the low frequency.

A cet effet, l'invention concerne une antenne plane à large bande passante, du type antenne patch, notamment pour l'émission et/ou la réception de signaux UHF/SHF de type télévision terrestre numérique et/ou analogique, comportant un réflecteur accordé à la fréquence basse de la bande passante et un radiateur raccordé à une alimentation spécifique et rayonnant selon une fréquence F1, ce radiateur présentant encore une fente accordée à une fréquence F2, caractérisée par le fait que le radiateur comporte encore au moins une autre fente accordée à une fréquence F3 différente aux fréquences F1 et F2, ces fentes étant reliées par une fente de liaison définie apte à constituer une ligne de couplage pour assurer un courant électromagnétique au niveau de chacune des fentes de fréquence F2 et F3.For this purpose, the invention relates to a flat antenna with a wide bandwidth, of the patch antenna type, in particular for the transmission and / or reception of UHF / SHF signals of the digital terrestrial television and / or analogue type, comprising a reflector granted at the low frequency of the bandwidth and a radiator connected to a specific power supply and radiating at a frequency F 1 , this radiator further having a slot tuned to a frequency F 2 , characterized in that the radiator comprises at least one other slot tuned to a different frequency F 3 at the frequencies F 1 and F 2 , these slots being connected by a defined link slot capable of constituting a coupling line for providing an electromagnetic current at each of the frequency slots F 2 and F 3 .

Selon un premier mode de réalisation, les fentes que relient la fente de liaison, définissant une ligne de couplage, sont géométriquement identiques, tandis que l'alimentation du radiateur intervient de manière dissymétrique entre les fentes pour assurer le rayonnement de ces dernières selon les fréquences, respectivement, F2 et F3 différentes.According to a first embodiment, the slots that connect the connection slot, defining a coupling line, are geometrically identical, while the supply of the radiator occurs asymmetrically between the slots to ensure the radiation of the latter according to the frequencies, respectively, F2 and F3 different.

Selon un autre mode de réalisation, ces fentes sont définies de dimensions différentes pour assurer leur rayonnement selon des fréquences F2 et F3 différentes.According to another embodiment, these slots are defined of different dimensions to ensure their radiation at different frequencies F2 and F3.

Préférentiellement, encore, l'antenne comporte, disposé au-dessus du radiateur et parallèlement à ce dernier, au moins un élément parasite aux dimensions plus petites pour un élargissement de la bande passante en haut de bande.Preferably, again, the antenna comprises, disposed above the radiator and parallel to the latter, at least one parasitic element with smaller dimensions for broadening the bandwidth at the top of the band.

Selon une autre particularité de la présente invention, le réflecteur comporte au moins deux de ses bords périphériques opposés repliés dans un plan qui lui est perpendiculaire en direction du radiateur.According to another feature of the present invention, the reflector comprises at least two of its opposite peripheral edges folded in a plane which is perpendicular to it in the direction of the radiator.

De manière avantageuse, les bords périphériques opposés repliés sont ceux croisant le plan de polarisation du radiateur.Advantageously, the opposite peripheral edges folded are those crossing the plane of polarization of the radiator.

Avantageusement, encore, ces bords périphériques repliés s'étendent dans des plans, qui par rapport aux bords correspondants du radiateur, se situent à une distance plus faible que celle séparant le plan de ce radiateur et celui du réflecteur.Advantageously, again, these folded peripheral edges extend in planes, which relative to the corresponding edges of the radiator, are at a distance smaller than that separating the plane of this radiator and that of the reflector.

C'est encore dans le cadre d'une démarche inventive que l'on a imaginé abaisser la fréquence de rayonnement de l'antenne patch en chargeant le radiateur par rapprochement de ce dernier des bords périphériques opposés du réflecteur croisant le plan de polarisation.It is also within the framework of an inventive step that it has been imagined to lower the radiation frequency of the patch antenna by charging the radiator by bringing the latter closer to the opposite peripheral edges of the reflector crossing the plane of polarization.

Comme déjà indiqué précédemment, les avantages de la présente invention consistent en un élargissement sensible de la bande passante d'une antenne patch, soit de l'ordre de 100% de sa fréquence de rayonnement basse.As already indicated above, the advantages of the present invention consist in a substantial widening of the bandwidth of a patch antenna, ie of the order of 100% of its low radiation frequency.

Finalement, cela permet à une telle antenne patch de couvrir l'intégralité de la gamme des fréquences correspondant, par exemple, aux signaux de télévision terrestres, qu'ils soient de type numérique ou analogique.Finally, this allows such a patch antenna to cover the entire range of frequencies corresponding, for example, to terrestrial television signals, whether digital or analog.

D'autres buts et avantages de la présente invention apparaîtront au cours de la description qui va suivre se rapportant à un mode de réalisation qui n'est donné qu'à titre d'exemple indicatif et non limitatif.Other objects and advantages of the present invention will become apparent from the following description relating to an embodiment which is given by way of indicative and non-limiting example.

La compréhension de cette description sera facilitée en se référant aux dessins ci-joints dans lesquels :

  • la figure 1 est une représentation schématisée et en coupe selon le plan de polarisation électrique (plan E) d'une antenne plane sans élément parasite, de type patch conforme à l'invention ;
  • la figure 2 est une représentation schématisée et en plan du radiateur ;
  • la figure 3 est une représentation schématisée, vue en plan, d'une antenne plane conforme à l'invention dont le radiateur est surmonté d'un élément parasite ;
  • la figure 4 est une représentation en perspective de l'antenne selon l'invention.
The understanding of this description will be facilitated by reference to the accompanying drawings in which:
  • Figure 1 is a schematic representation and in section along the electric polarization plane (E plane) of a flat antenna without parasitic element, patch type according to the invention;
  • Figure 2 is a schematic representation and in plan of the radiator;
  • Figure 3 is a schematic representation, in plan view, of a planar antenna according to the invention, the radiator is surmounted by a parasitic element;
  • Figure 4 is a perspective representation of the antenna according to the invention.

Ainsi que représenté dans les figures du dessin ci-joint, la présente invention a trait à une antenne plane à large bande passante pour l'émission et/ou la réception de signaux UHF et/ou SHF, en particulier de signaux de télévision terrestres numériques et/ou analogiques.As shown in the figures of the attached drawing, the present invention relates to a high bandwidth flat antenna for transmitting and / or receiving UHF and / or SHF signals, in particular digital terrestrial television signals. and / or analog.

Cette antenne 1 comporte un réflecteur plan 2 en matériau métallique au-dessus duquel s'étend un radiateur 3, également métallique, relié à une alimentation spécifique 4.This antenna 1 comprises a plane reflector 2 of metal material above which extends a radiator 3, also metallic, connected to a specific power supply 4.

Un substrat diélectrique sépare le radiateur 3 du réflecteur 2 tenant compte, à ce propos, que la distance P entre ces derniers est dépendante de la permittivité de ce substrat.A dielectric substrate separates the radiator 3 from the reflector 2 taking into account, in this respect, that the distance P between the latter is dependent on the permittivity of this substrate.

A noter que cette distance P influe sur le gain et l'impédance de l'antenne 1.Note that this distance P influences the gain and the impedance of the antenna 1.

Pour en revenir au réflecteur 2, ses dimensions sont déterminées en fonction de la fréquence basse de la bande de fréquence dans laquelle doit rayonner cette antenne 1.To return to the reflector 2, its dimensions are determined according to the low frequency of the frequency band in which this antenna 1 should radiate.

Tout particulièrement, en réalisant le radiateur 3 sous forme d'un circuit imprimé 3a simple face sur un substrat diélectrique 3b dont la permittivité εr est supérieure à 1, il est possible de réduire les dimensions du réflecteur 2 et, par conséquent, d'obtenir une antenne plus petite.More particularly, by producing the radiator 3 in the form of a single-sided printed circuit 3a on a dielectric substrate 3b whose permittivity εr is greater than 1, it is possible to reduce the dimensions of the reflector 2 and, consequently, to obtain a smaller antenna.

Partant d'une surface de réflecteur 2 donnée, imposant, normalement, la taille de l'antenne 1, les dimensions de ces dernières peuvent encore être réduites en repliant, dans un plan perpendiculaire en direction du radiateur 3, au moins deux des bords périphériques opposés 5, 6 de ce réflecteur 2.Starting from a given reflector surface 2, which normally imposes the size of the antenna 1, the dimensions of the latter can be further reduced by folding, in a plane perpendicular to the radiator 3, at least two of the peripheral edges opposed 5, 6 of this reflector 2.

Selon une particularité de la présente invention, le radiateur 3 comporte au moins deux fentes 7, 8 accordées à des fréquences, respectivement, F2 et F3 différentes entre elles et par rapport à la fréquence de rayonnement F1 du radiateur 3. Tout particulièrement, ces fentes 7, 8, s'étendent parallèlement au plan de polarisation du radiateur 3.According to a feature of the present invention, the radiator 3 comprises at least two slots 7, 8 tuned to frequencies, respectively, F 2 and F 3 different from each other and with respect to the radiation frequency F 1 of the radiator 3. Particularly these slots 7, 8 extend parallel to the polarization plane of the radiator 3.

A ce propos, les fentes 7, 8 peuvent être définies de dimensions distinctes pour assurer leur rayonnement selon des fréquences F2 et F3 différentes.In this regard, the slots 7, 8 may be defined in different dimensions to ensure their radiation at different frequencies F2 and F3.

Selon un autre mode de réalisation, leur rayonnement à des fréquences F2 et F3 différentes résulte d'une alimentation dissymétrique entre lesdites fentes, sachant que l'invention s'étend encore à une solution combinant l'un et l'autre de ces modes de réalisation.According to another embodiment, their radiation at different frequencies F2 and F3 results from an asymmetrical power supply between said slots, knowing that the invention still extends to a solution combining one and the other of these modes of production.

Pour assurer un courant électromagnétique dans chacune de ces fentes 7, 8, elles sont reliées au travers d'une fente de liaison 9 définie apte à constituer une ligne de couplage.To ensure an electromagnetic current in each of these slots 7, 8, they are connected through a bonding slot 9 defined capable of constituting a coupling line.

L'on observera que si une fente s'assimile à une capacité et une self reliée en parallèle, la fente de liaison 9 joue, elle, le rôle de capacité pour assurer cette fonction de ligne couplage qui lui est attribuée.It will be observed that if a slot is similar to a capacitance and a self connected in parallel, the link slot 9 plays the role of capacity to perform this coupling line function assigned to it.

L'on comprend bien que si le réflecteur 2 est accordé à la fréquence basse de la bande passante, le radiateur 3 et les fentes 7, 8, progressivement plus petites, sont accordées à des fréquences plus élevées et constituent, par conséquent, un élargissement de la bande passante vers le haut.It is understood that if the reflector 2 is tuned to the low frequency of the bandwidth, the radiator 3 and the slots 7, 8, progressively smaller, are tuned to higher frequencies and therefore constitute an enlargement. bandwidth up.

A ce propos, un gain en haut de bande est encore obtenu par la superposition au radiateur 3 d'au moins un élément parasite 10, aux dimensions plus petites que le radiateur 3 et s'étendant, sensiblement, au-dessus des fentes 7, 8.In this respect, a gain at the top of the band is still obtained by the superposition to the radiator 3 of at least one parasitic element 10, with dimensions smaller than the radiator 3 and extending substantially above the slots 7, 8.

A noter que ces dernières définissent, au niveau du radiateur 3, un plan de polarisation électrique Pe et un plan de polarisation magnétique Pm qui lui est perpendiculaire.Note that the latter define, in the radiator 3, an electric polarization plane Pe and a magnetic polarization plane Pm perpendicular thereto.

De manière préférentielle, les bords périphériques opposés 5, 6 de ce réflecteur 2 qui sont repliés en équerre en direction du radiateur sont ceux coupés par ce plan magnétique Pm.Preferably, the opposite peripheral edges 5, 6 of this reflector 2 which are folded at right angles towards the radiator are those cut by this magnetic plane Pm.

Selon une autre caractéristique de la présente invention, l'on charge le radiateur 3 en rapprochant les bords périphériques repliés 5, 6 du réflecteur 2 des bords correspondants 11, 12 de ce radiateur 3 d'une distance d inférieure à la distance P précitée. Il en découle un abaissement de la fréquence de rayonnement basse de l'antenne 1. En somme, cette solution contribue, là encore, à une réduction de la taille de l'antenne 1 dans la mesure où les dimensions de cette dernière sont déterminées par celles du réflecteur 2 par ailleurs accordés à la fréquence basse de la bande passante de ladite antenne 1.According to another characteristic of the present invention, the radiator 3 is loaded by bringing the folded peripheral edges 5, 6 of the reflector 2 closer to the corresponding edges 11, 12 of this radiator 3 by a distance d less than the aforementioned distance P. This results in a lowering of the low radiation frequency of the antenna 1. In sum, this solution contributes, again, to a reduction in the size of the antenna 1 since the dimensions of the latter are determined by those of the reflector 2 moreover tuned to the low frequency of the bandwidth of said antenna 1.

Si l'on prend à présent l'exemple de la réception des signaux de télévision terrestre numériques et/ou analogiques, s'étendant dans une plage de fréquence comprise entre 474 et 862 MHz, les essais d'une antenne, conforme à l'invention et aux caractéristiques dimensionnelles ci-dessous, ont montré qu'elle était à même de couvrir cette gamme de fréquence avec un gain optimal. A = 70 mm B = 100 mm C= 95,5 mm D = 95,5 mm E = 113 mm F = 12 mm G = 113 mm H = 12,5 mm I = 36 mm J = 46 mm K = 0,9 mm L = 191 mm M = 170 mm N = 176 mm O = 198 mm P = 26 mm Q = 4 mm R = 4 mm S = 3,5 mm T = 3,5 mm U = 30 mm V = 3,25 mm W = 71 mm X = 65,5 mm If we now take the example of the reception of digital and / or analogue terrestrial television signals, extending in a frequency range between 474 and 862 MHz, the tests of an antenna, in accordance with the The invention and the dimensional characteristics below have shown that it is able to cover this frequency range with optimum gain. A = 70 mm B = 100 mm C = 95.5 mm D = 95.5 mm E = 113 mm F = 12 mm G = 113 mm H = 12.5 mm I = 36 mm J = 46 mm K = 0.9 mm L = 191 mm M = 170 mm N = 176 mm O = 198 mm P = 26 mm Q = 4 mm R = 4 mm S = 3.5 mm T = 3.5 mm U = 30 mm V = 3.25 mm W = 71 mm X = 65.5 mm

Evidemment, la présente invention n'est nullement limitée à ces dimensions.Obviously, the present invention is not limited to these dimensions.

En fin de compte, la présente invention doit être considérée comme un net progrès dans le domaine technique considéré, puisque cette gamme des fréquences des signaux de télévision terrestre numériques et/ou analogiques ne pouvaient être couvertes jusqu'ici que par l'emploi de plusieurs antennes planes de type patch.In the end, the present invention must be considered as a clear progress in the technical field considered, since this range of frequencies of television signals Digital terrestrial and / or analog could only be hitherto covered by the use of several flat patch antennas.

Claims (7)

  1. Planar broadband antenna of the type patch antenna, in particular for transmitting and/or receiving UHF/SHF signals of the digital and/or analogue terrestrial television type, including a reflector (2) tuned at the low pass-band frequency and a radiator (3) connected to a specific current-supply (4) and radiating at a frequency F1, this radiator (3) also having a slot (7) tuned at a frequency F2, characterised in that the radiator (3) also includes at least another slot (8) tuned at a frequency F3 different from the frequencies F1 und F2, these slots (7, 8) being connected by a connecting slot (9) defined capable of forming a coupling line, in order to ensure an electromagnetic current in each of these slots (7, 8) of frequency F2, F3.
  2. Planar antenna of the type patch antenna according to claim 1, characterised in that the slots (7, 8) are defined of different sizes, in order to ensure their radiation at different frequencies F2 and F3.
  3. Planar antenna of the type patch antenna according to claim 1 or 2, characterised in that the radiation at different frequencies F2 and F3 of the slots (7, 8) is ensured by a specific current-supply (4) of the radiator (3) provided for in an asymmetric way between said slots (7, 8).
  4. Planar antenna of the type patch antenna according to any of the preceding claims, characterised in that it includes, arranged above the radiator (3) and parallel to the latter, at least one parasitic element (10) of smaller dimensions, in order to widen the pass-band in the upper portion of the bandwidth.
  5. Planar antenna of the type patch antenna according to any of the preceding claims, characterised in that the reflector (2) includes at least two of its opposite peripheral edges (5, 6) folded back in a plane perpendicular to it in the direction of the radiator (3).
  6. Planar antenna of the type patch antenna according to claim 5, characterised in that the opposite peripheral edges (5, 6) folded back in the direction of the radiator (3) are those, which cross the biasing plane (Pm) of the latter.
  7. Planar antenna of the type patch antenna according to claim 5 or 6, characterised in that the opposite peripheral edges (5, 6) of the reflector (2) are at a distance (d) from each other, which is smaller than the distance (p) that separated the plane of this reflector (2) from that of said radiator (3), in order to load the latter and to ensure a drop of the lower radiation frequency of the antenna (1).
EP03761621A 2002-06-28 2003-06-17 Multiband planar antenna Expired - Lifetime EP1518296B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0208113A FR2841688B1 (en) 2002-06-28 2002-06-28 PATCH TYPE FLAT ANTENNA, IN PARTICULAR FOR TRANSMITTING AND / OR RECEIVING DIGITAL AND / OR ANALOGUE TERRESTRIAL TELEVISION SIGNALS
FR0208113 2002-06-28
PCT/FR2003/001829 WO2004004066A1 (en) 2002-06-28 2003-06-17 Multiband planar antenna

Publications (2)

Publication Number Publication Date
EP1518296A1 EP1518296A1 (en) 2005-03-30
EP1518296B1 true EP1518296B1 (en) 2006-08-23

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EP03761621A Expired - Lifetime EP1518296B1 (en) 2002-06-28 2003-06-17 Multiband planar antenna

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US (1) US7151491B2 (en)
EP (1) EP1518296B1 (en)
CN (1) CN100449866C (en)
AT (1) ATE337628T1 (en)
AU (1) AU2003263244A1 (en)
DE (1) DE60307848D1 (en)
FR (1) FR2841688B1 (en)
WO (1) WO2004004066A1 (en)

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Publication number Priority date Publication date Assignee Title
FR2887078B1 (en) * 2005-06-10 2007-08-10 Calcem Eurl Sarl TELEVISION PLANAR ANTENNA
US8139624B1 (en) * 2005-08-25 2012-03-20 Rockwell Collins, Inc. System and method for providing multiple ad hoc communication networks on a hardware channel
CN100391048C (en) * 2005-12-09 2008-05-28 上海大学 Super-wide band high-gain printed-gap antenna
US20100039327A1 (en) * 2008-08-12 2010-02-18 Chung-Wen Yang Digital television antenna
WO2010028309A2 (en) * 2008-09-05 2010-03-11 Schneider Richard E Smart antenna systems suitable for reception of digital television signals
FR2956251B1 (en) 2010-02-05 2012-12-28 Khamprasith Bounpraseuth DOUBLE FOLDED ANTENNA REPLIE
WO2011141860A1 (en) 2010-05-14 2011-11-17 Assa Abloy Ab Wideband uhf rfid tag
US9748656B2 (en) 2013-12-13 2017-08-29 Harris Corporation Broadband patch antenna and associated methods
US11239561B2 (en) * 2017-05-15 2022-02-01 Sony Group Corporation Patch antenna for millimeter wave communications
CN108039591B (en) * 2017-11-17 2020-05-12 复旦大学 Double-linear polarization rectifying antenna with harmonic suppression capability
EP3918663B1 (en) * 2019-02-25 2023-06-21 Huawei Technologies Co., Ltd. Dual port antenna structure

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Publication number Priority date Publication date Assignee Title
CA1263745A (en) * 1985-12-03 1989-12-05 Nippon Telegraph & Telephone Corporation Shorted microstrip antenna
US4692769A (en) * 1986-04-14 1987-09-08 The United States Of America As Represented By The Secretary Of The Navy Dual band slotted microstrip antenna
JP3449484B2 (en) * 1997-12-01 2003-09-22 株式会社東芝 Multi-frequency antenna
FR2811479B1 (en) * 2000-07-10 2005-01-21 Cit Alcatel CONDUCTIVE LAYER ANTENNA AND BI-BAND TRANSMISSION DEVICE INCLUDING THE ANTENNA
DE10064128A1 (en) * 2000-12-21 2002-07-25 Kathrein Werke Kg Patch antenna for operation in at least two frequency ranges

Also Published As

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ATE337628T1 (en) 2006-09-15
FR2841688A1 (en) 2004-01-02
US20060164303A1 (en) 2006-07-27
US7151491B2 (en) 2006-12-19
WO2004004066A1 (en) 2004-01-08
CN100449866C (en) 2009-01-07
AU2003263244A1 (en) 2004-01-19
EP1518296A1 (en) 2005-03-30
DE60307848D1 (en) 2006-10-05
CN1666382A (en) 2005-09-07
FR2841688B1 (en) 2006-06-30

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