EP2009735A1 - Antenna with diversity of polarisation for transmitting and/or receiving audio and/or video signals - Google Patents
Antenna with diversity of polarisation for transmitting and/or receiving audio and/or video signals Download PDFInfo
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- EP2009735A1 EP2009735A1 EP07447039A EP07447039A EP2009735A1 EP 2009735 A1 EP2009735 A1 EP 2009735A1 EP 07447039 A EP07447039 A EP 07447039A EP 07447039 A EP07447039 A EP 07447039A EP 2009735 A1 EP2009735 A1 EP 2009735A1
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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
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
Definitions
- the present invention relates, in general, to a polarization diversity antenna for transmitting and / or receiving audio and / or video signals.
- the invention relates to a polarization diversity antenna for transmitting and / or receiving audio and / or video signals, of the kind comprising a plurality of identical antenna elements powered electrically by currents of substantially the same phase and the same amplitude, each antenna element comprising a radiating element formed of two polygonal geometric figures joined by a common vertex, a feed center and a reflector associated with this radiating element.
- Microstrip patch antennas used in particular in wireless computer networks have certain advantages such as low weight, small footprint and low cost of use. They are available in either horizontal or vertical linear polarization or left or right circular polarization for telecommunications. However, these antennas also have limited possibilities. As examples, the narrow bandwidth is often associated with problems of geometric and physical tolerance and generally low gain (6 d Bi).
- the object of the present invention is to propose an antenna of the type indicated above, of a non-prohibitive cost, which has a flexible use because it allows a diversity of polarization and whose performances are superior to those of antennas of the state of the technique, in particular antennas of the patch type, used in comparable applications.
- the antenna according to the invention is characterized in that it comprises two identical and separate radiating elements whose respective longitudinal axes of symmetry intersect orthogonally at said feed centers which are isolated one of each other and fed individually.
- each antenna element comprises a radiating element or radiator configured according to a double continuous loop of perimeter substantially equal to two wavelengths (2 ⁇ ), these two loops being located in the same plane , having a common vertex and being selected from a set of polygonal geometrical shapes comprising quadrilaterals undistorted or deformed into a series of polygons whose vertices grow in number toward each other until they form a geometrical figure devoid of such highs.
- the two loops are chosen from a set of polygonal geometrical shapes resulting from the deformation of a quadrilateral, these polygonal shapes being capable of to ensure a greater range of the bandwidth and to increase the gain compared to the undeformed quadrilateral.
- the antenna element may represent a continuous double loop taking the form of, for example, two squares or, preferably, two pentagons, hexagons or other higher polygons until reaching and understanding geometric shapes without sharp angles. for example two ellipses.
- each radiating element is configured according to a double continuous loop representing two identical polygonal geometric shapes.
- the two radiating elements are of identical shape and each configured in a double continuous loop representing two identical polygonal geometric shapes.
- each antenna element comprises a radiating element configured according to a double continuous loop taking the geometric form of two pentagons.
- the radiating element takes the form, therefore, of a decagonal loop.
- the two radiating elements are each configured in an identical decagonal loop.
- the radiating element is in the form of two pentagons
- the three adjacent sides of each of them, with respect to the furthest sides of the feeding center, are advantageously located each along the sides of a single and even rectangle. Consequently, the two pentagons of the same radiating element each comprise two adjacent right angles.
- the two pentagons in question correspond to two adjacent parallel quadrilaterals whose sides closest to each other are deformed towards each other so as to constitute the outline of a feeding center. .
- the radiating element taking the form of a double pentagon or double quadrilateral deformed thus described may be designated later in the description as in the claims by the name "biquad".
- the radiating element is usually made from a wire advantageously copper, placed at a short distance from the receiver to which it is attached.
- this metal wire may be replaced preferably by a printed circuit on a dielectric support panel, printing performed according to known methods.
- the two printed circuits, each forming a radiating element are respectively fixed on the opposite faces of the same support panel, for example a laminated panel formed of a glass fiber reinforced epoxy composite.
- a panel is generally thin usually less than 2 mm.
- This usually takes the form of a plate configured in support of said radiating elements which are directly attached thereto or, preferably, via a dielectric panel supporting them, in particular in the form of printed circuits.
- This reflector consists of a metal plate generally made of copper or aluminum. Steel, especially stainless steel or polychlorinated biphenyl (“PCB”) can be used as well. In this case, and in known manner, it may be advantageous to solder, for example copper to the coaxial power cable orifice, orifice formed in this reflector so as to ensure a good physical and electrical connection.
- PCB polychlorinated biphenyl
- the different radiating elements are connected, via their respective supply center, to a divider / phase shifter circuit, in particular such a circuit capable of providing a phase shift of, for example, 90 °.
- This connection is generally provided by means of a coaxial power supply cable.
- the antenna according to the invention comprises a set of two radiating elements of biquad type, namely a radiating element 1 placed horizontally and an identical radiating element 2 placed vertically.
- These two radiating elements are each configured in closed loop forming, in this case, two pentagons equal in the same plane and united by a common vertex.
- these biquads 1 and 2 intersect perfectly at 90 ° avoiding any interaction between them.
- the farthest sides of the feed center 4 of the radiating element 1 that is to say the three sides adjacent a, b, c of the first pentagon and the three adjacent sides d, e, f of the second pentagon, are located along the edges of the same rectangle. Therefore, the sides a and b; b and c; d and e and e and f are orthogonal.
- the length of the sides b and e is about 55 mm
- the length of the sides a, c, d, and f is about 50 mm and the total length of this biquad 1 is about 120 mm. Since biquads 1 and 2 are equal, the characteristics listed above for biquad 1 are found at biquad 2.
- these biquads 1 and 2 are in the form of printed circuits respectively on the opposite faces of a panel 3 of thickness 1.6 mm, made of woven and glued glass fibers, for example a FR4 board as shown in figure 2 .
- the figure 1 also shows, in addition to the feeding center 4 of the biquad 1, the feeding center 5 of the biquad 2. These feeding centers, isolated from each other, are spaced about 40 mm from the reflector 6 visible to the figure 2 which consists of an aluminum plate G3 of about 250 mm ⁇ 250 mm and about 1.5 mm thick.
- each of these biquads is connected via its respective power supply center to a divider / phase-shifter circuit 7 of the type having 4 inputs, which is shown in FIG. figure 2 .
- This phase-shifting circuit printed on a double-sided FR4 panel, is loaded on 50 ⁇ and has an input 8 in connection with an electric power source (not shown) while the inputs 9 and 10 are connected respectively to the biquad 1 through its feed center 4 and biquad 2 via its center of supply 5.
- This connection is provided, on the other hand, by means of coaxial cables 11 and 12 with an impedance of 50 ⁇ , power supply cables covered with electrically neutral material.
- the input 9 connected to the horizontal biquad 1 may be out of phase + 90 ° or the input 10 connected to the biquad 2 may be, in turn, out of phase -90 ° and this, so as to put in phase these two radiating elements 1 and 2 and configure the antenna in circular polarization respectively right or left.
- the polarization diversity antenna according to the invention provides undeniable advantages over the state of the art represented in particular by the patch antenna and can be developed at a low cost, in any event comparable to that of this type of antenna.
- the bandwidth and the gain, close to 9 dBi, offered by the antenna according to the invention in circular polarization prove to be greater than with a patch antenna.
- the opening of the main lobe of the antenna according to the invention is greater than 40 °.
- the circularly polarized antenna according to the invention could also be used in Wi-Fi in particular at 2.4 GHz for the transmission of images, for example from drones used for terrestrial observation, real time and from the sky.
- the antenna according to the invention may be used for the polarization decoupling measurement and in particular in specific cases where the antenna polarization switching is frequent.
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Abstract
Description
La présente invention se rapporte, d'une manière générale, à une antenne à diversité de polarisation pour la transmission et/ou la réception de signaux audio et/ou vidéo.The present invention relates, in general, to a polarization diversity antenna for transmitting and / or receiving audio and / or video signals.
Plus précisément, l'invention concerne une antenne à diversité de polarisation pour la transmission et/ou la réception de signaux audio et/ou vidéo, du genre comprenant plusieurs éléments d'antenne identiques alimentés radio-électriquement par des courants sensiblement de même phase et de même amplitude, chaque élément d'antenne comprenant un élément rayonnant formé de deux figures géométriques polygonales réunies par un sommet commun, un centre d'alimentation ainsi qu'un réflecteur associé à cet élément rayonnant.More specifically, the invention relates to a polarization diversity antenna for transmitting and / or receiving audio and / or video signals, of the kind comprising a plurality of identical antenna elements powered electrically by currents of substantially the same phase and the same amplitude, each antenna element comprising a radiating element formed of two polygonal geometric figures joined by a common vertex, a feed center and a reflector associated with this radiating element.
Les antennes patch microstrip utilisées notamment dans des réseaux informatiques sans fil (Wi-Fi) présentent certains avantages tels que faible poids, encombrement réduit et coût d'utilisation restreint. Elles sont disponibles soit en polarisation linéaire horizontale ou verticale, soit en polarisation circulaire gauche ou droite pour les télécommunications. Toutefois, ces antennes ont également des possibilités limitées. A titre d'exemples, la bande passante est étroite souvent associée à des problèmes de tolérance géométrique et physique et de gain généralement faible (6 d Bi).Microstrip patch antennas used in particular in wireless computer networks (Wi-Fi) have certain advantages such as low weight, small footprint and low cost of use. They are available in either horizontal or vertical linear polarization or left or right circular polarization for telecommunications. However, these antennas also have limited possibilities. As examples, the narrow bandwidth is often associated with problems of geometric and physical tolerance and generally low gain (6 d Bi).
Par ailleurs, la plupart d'entre elles rayonnent uniquement dans le demi-plan, supportent des faibles puissances (100 w) et présentent des pertes de rayonnement.Moreover, most of them radiate only in the half-plane, support weak powers (100 w) and have radiation losses.
La présente invention a pour but de proposer une antenne, du type indiqué précédemment, d'un coût non prohibitif, qui présente une utilisation souple car permettant une diversité de polarisation et dont les performances sont supérieures à celles d'antennes de l'état de la technique, notamment des antennes du genre patch, utilisées dans des applications comparables.The object of the present invention is to propose an antenna of the type indicated above, of a non-prohibitive cost, which has a flexible use because it allows a diversity of polarization and whose performances are superior to those of antennas of the state of the technique, in particular antennas of the patch type, used in comparable applications.
Pour atteindre ce but, l'antenne selon l'invention est caractérisée en ce qu'elle comprend deux éléments rayonnants identiques et séparés dont les axes de symétrie longitudinaux respectifs se croisent orthogonalement au niveau desdits centres d'alimentation lesquels sont isolés l'un de l'autre et alimentés individuellement.To achieve this goal, the antenna according to the invention is characterized in that it comprises two identical and separate radiating elements whose respective longitudinal axes of symmetry intersect orthogonally at said feed centers which are isolated one of each other and fed individually.
Selon une caractéristique supplémentaire de l'invention, chaque élément d'antenne comprend un élément rayonnant ou radiateur configuré selon une double boucle continue de périmètre sensiblement égal à deux longueurs d'onde (2 λ), ces deux boucles étant situées dans un même plan, ayant un sommet commun et étant choisies parmi un ensemble de formes géométriques polygonales comprenant des quadrilatères non déformés ou déformés en une suite de polygones dont les sommets croissent en nombre en se rapprochant les uns des autres jusqu'à constituer une figure géométrique dépourvue de tels sommets.According to a further feature of the invention, each antenna element comprises a radiating element or radiator configured according to a double continuous loop of perimeter substantially equal to two wavelengths (2 λ), these two loops being located in the same plane , having a common vertex and being selected from a set of polygonal geometrical shapes comprising quadrilaterals undistorted or deformed into a series of polygons whose vertices grow in number toward each other until they form a geometrical figure devoid of such highs.
Selon une caractéristique particulière de l'invention, les deux boucles sont choisies parmi un ensemble de formes géométriques polygonales issues de la déformation d'un quadrilatère, ces formes polygonales étant capables d'assurer une étendue plus importante de la bande passante et d'augmenter le gain par rapport au quadrilatère non déformé.According to a particular characteristic of the invention, the two loops are chosen from a set of polygonal geometrical shapes resulting from the deformation of a quadrilateral, these polygonal shapes being capable of to ensure a greater range of the bandwidth and to increase the gain compared to the undeformed quadrilateral.
En conséquence, l'élément d'antenne peut représenter une double boucle continue prenant la forme par exemple de deux carrés ou, de préférence, deux pentagones, hexagones ou autres polygones supérieurs jusqu'à atteindre et comprendre des formes géométriques dépourvues d'angles vifs par exemple deux ellipses.As a result, the antenna element may represent a continuous double loop taking the form of, for example, two squares or, preferably, two pentagons, hexagons or other higher polygons until reaching and understanding geometric shapes without sharp angles. for example two ellipses.
En outre, selon une autre caractéristique de l'invention, chaque élément rayonnant est configuré selon une double boucle continue représentant deux formes géométriques polygonales identiques.In addition, according to another characteristic of the invention, each radiating element is configured according to a double continuous loop representing two identical polygonal geometric shapes.
Selon une mise en oeuvre préférée, les deux éléments rayonnants sont de forme identique et configurés chacun selon une double boucle continue représentant deux formes géométriques polygonales identiques.According to a preferred embodiment, the two radiating elements are of identical shape and each configured in a double continuous loop representing two identical polygonal geometric shapes.
Dans un tel cas, une seule forme géométrique polygonale est, par conséquent, à la base de la configuration de ces deux éléments rayonnants.In such a case, a single polygonal geometric shape is, therefore, the basis of the configuration of these two radiating elements.
D'autre part, selon une autre caractéristique avantageuse et préférée de l'invention, chaque élément d'antenne comprend un élément rayonnant configuré selon une double boucle continue prenant la forme géométrique de deux pentagones.On the other hand, according to another advantageous and preferred feature of the invention, each antenna element comprises a radiating element configured according to a double continuous loop taking the geometric form of two pentagons.
Dans une telle configuration, l'élément rayonnant prend la forme, par conséquent, d'une boucle décagonale.In such a configuration, the radiating element takes the form, therefore, of a decagonal loop.
Au surplus, selon une caractéristique particulière et préférée de l'invention, les deux éléments rayonnants sont configurés chacun selon une boucle décagonale identique.In addition, according to a particular and preferred feature of the invention, the two radiating elements are each configured in an identical decagonal loop.
Lorsque l'élément rayonnant se présente sous la forme de deux pentagones, les trois côtés adjacents de chacun d'eux, s'agissant des côtés les plus éloignés du centre d'alimentation, sont avantageusement situés chacun le long des côtés d'un seul et même rectangle. Par conséquent, les deux pentagones d'un même élément rayonnant comportent chacun deux angles droits adjacents.When the radiating element is in the form of two pentagons, the three adjacent sides of each of them, with respect to the furthest sides of the feeding center, are advantageously located each along the sides of a single and even rectangle. Consequently, the two pentagons of the same radiating element each comprise two adjacent right angles.
En fait, les deux pentagones en question correspondent à deux quadrilatères parallèles adjacents dont les côtés les plus proches l'un de l'autre se déforment l'un vers l'autre de manière à constituer l'ébauche d'un centre d'alimentation.In fact, the two pentagons in question correspond to two adjacent parallel quadrilaterals whose sides closest to each other are deformed towards each other so as to constitute the outline of a feeding center. .
Pour cette raison, l'élément rayonnant prenant la forme d'un double pentagone ou double quadrilatère déformé ainsi décrit pourra être désigné par la suite aussi bien dans la description que dans les revendications par la dénomination « biquad ».For this reason, the radiating element taking the form of a double pentagon or double quadrilateral deformed thus described may be designated later in the description as in the claims by the name "biquad".
L'élément rayonnant est réalisé habituellement à partir d'un fil métallique avantageusement le cuivre, disposé à faible distance du récepteur auquel il est fixé. Toutefois, ce fil métallique peut être remplacé préférentiellement par un circuit imprimé sur un panneau support diélectrique, impression réalisée selon des méthodes connues.The radiating element is usually made from a wire advantageously copper, placed at a short distance from the receiver to which it is attached. However, this metal wire may be replaced preferably by a printed circuit on a dielectric support panel, printing performed according to known methods.
Selon une mise en oeuvre préférée, les deux circuits imprimés, formant chacun élément rayonnant, sont fixés respectivement sur les faces opposées d'un même panneau support,par exemple un panneau stratifié formé d'un composite époxy renforcé de fibres de verre. Un tel panneau est généralement de faible épaisseur habituellement inférieure à 2 mm. Ces éléments rayonnants, en particulier leurs centres d'alimentation, se retrouvent, par conséquent, dans des plans parallèles toutefois situés à très faible distance l'un de l'autre ou, en d'autres termes, à distance sensiblement égale du réflecteur.According to a preferred embodiment, the two printed circuits, each forming a radiating element, are respectively fixed on the opposite faces of the same support panel, for example a laminated panel formed of a glass fiber reinforced epoxy composite. Such a panel is generally thin usually less than 2 mm. These elements radiating, in particular their feeding centers, are found, therefore, in parallel planes however located at a very short distance from one another or, in other words, at substantially equal distance from the reflector.
Pour cette raison, un réflecteur unique sera avantageusement utilisé. Celui-ci prend habituellement la forme d'une plaque configurée en support desdits éléments rayonnants qui y sont fixés directement ou, de préférence, par l'intermédiaire d'un panneau diélectrique les supportant, notamment sous forme de circuits imprimée.For this reason, a single reflector will be advantageously used. This usually takes the form of a plate configured in support of said radiating elements which are directly attached thereto or, preferably, via a dielectric panel supporting them, in particular in the form of printed circuits.
Ce réflecteur est constitué d'une plaque métallique généralement en cuivre ou en aluminium. L'acier, en particulier l'acier inoxydable ou encore le polychlorobiphényle (« PCB ») peut être utilisé également. Dans ce cas, et de manière connue, il peut être avantageux de braser, par exemple du cuivre à l'orifice du câble coaxial d'alimentation, orifice ménagé dans ce réflecteur de manière à assurer une bonne connexion physique et électrique.This reflector consists of a metal plate generally made of copper or aluminum. Steel, especially stainless steel or polychlorinated biphenyl ("PCB") can be used as well. In this case, and in known manner, it may be advantageous to solder, for example copper to the coaxial power cable orifice, orifice formed in this reflector so as to ensure a good physical and electrical connection.
Selon une autre caractéristique de l'invention, les différents éléments rayonnants sont reliés, via leur centre d'alimentation respectif, à un circuit diviseur/déphaseur,en particulier un tel circuit apte à assurer un déphasage par exemple de 90°.According to another characteristic of the invention, the different radiating elements are connected, via their respective supply center, to a divider / phase shifter circuit, in particular such a circuit capable of providing a phase shift of, for example, 90 °.
Cette liaison est assurée généralement par l'intermédiaire d'un câble coaxial d'alimentation en énergie.This connection is generally provided by means of a coaxial power supply cable.
L'antenne selon l'invention ainsi conçue peut être mise en oeuvre de différentes manières :
- a) L'isolation des centres d'alimentation entre eux permet, dans un système de réception, l'obtention de signaux de deux polarisations croisées de cette antenne en l'occurrence les polarisations verticale et horizontale. Toutefois, moyennant l'utilisation d'un circuit déphaseur de 90° alimentant séparément les deux centres d'alimentation en question à partir d'une source unique d'alimentation électrique, une polarisation circulaire peut être créée. Ainsi, un déphasage de +90° ou -90° entre ces centres d'alimentation provoqué par exemple par une commande électronique capable de les piloter, en particulier un circuit diviseur/déphaseur commandé et des commutateurs RF (radio-fréquence), permettra d'obtenir une polarisation circulaire respectivement droite ou gauche. Par conséquent, la configuration des deux centres d'alimentation ci-dessus couplée à un dispositif électronique de commande pour le pilotage de ces deux centres, permet la conception d'une antenne agile en polarisation.
- b) L'alimentation d'un seul des deux centres d'alimentation est capable de créer une polarisation linéaire verticale ou horizontale selon que l'élément rayonnant alimenté est respectivement l'élément vertical ou l'élément horizontal. Par conséquent, l'antenne selon l'invention peut être utilisée, si nécessaire, dans une configuration fixe pour des applications ne nécessitant ni diversité de polarisation ni agilité en polarisation.
- a) The isolation of the power centers between them makes it possible, in a reception system, to obtain signals from two crossed polarizations of this antenna, in this case the vertical and horizontal polarizations. However, with the use of a 90 ° phase shifter separately feeding the two power centers in question from a single source of power, a circular polarization can be created. Thus, a phase shift of + 90 ° or -90 ° between these centers of supply caused for example by an electronic control capable of driving them, in particular a controlled divider / phase-shifter circuit and RF (radio-frequency) switches, will enable obtain a circular polarization respectively right or left. Therefore, the configuration of the two above feed centers coupled to an electronic control device for controlling these two centers, allows the design of an antenna agile polarization.
- b) The feeding of only one of the two feed centers is capable of creating a vertical or horizontal linear polarization depending on whether the radiating element fed is respectively the vertical element or the horizontal element. Therefore, the antenna according to the invention can be used, if necessary, in a fixed configuration for applications requiring neither polarization diversity nor polarization agility.
L'invention sera mieux comprise et d'autres buts, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative qui va suivre en référence aux dessins annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention et dans lesquels :
- o La
figure 1 est une vue schématique frontale d'une antenne selon l'invention, - o La
figure 2 est une vue latérale de l'antenne à lafigure 1 couplée à un circuit de déphasage schématisé, - o La
figure 3 est une représentation du diagramme de rayonnement dans le plan horizontal d'une antenne à lafigure 1 .
- o The
figure 1 is a front schematic view of an antenna according to the invention, - o The
figure 2 is a side view of the antenna at thefigure 1 coupled to a schematic phase shift circuit, - o The
figure 3 is a representation of the radiation pattern in the horizontal plane of an antenna at thefigure 1 .
Tel que représenté à la
D'autre part, ces biquads 1 et 2 se présentent sous la forme de circuits imprimés respectivement sur les faces opposées d'un panneau 3 de 1,6mm d'épaisseur, réalisé en fibres de verre tissées et collées, par exemple un panneau FR4, tel que représenté à la
La
D'autre part, chacun de ces biquads est relié par l'intermédiaire de son centre d'alimentation respectif à un circuit diviseur/déphaseur 7 en anneau du type comportant 4 entrées, lequel est représenté à la
L'antenne à diversité de polarisation selon l'invention apporte des avantages incontestables par rapport à l'état de la technique représenté notamment par l'antenne patch et peut être élaborée moyennant un coût peu élevé, en tout état de cause comparable à celui de ce type d'antenne.The polarization diversity antenna according to the invention provides undeniable advantages over the state of the art represented in particular by the patch antenna and can be developed at a low cost, in any event comparable to that of this type of antenna.
A titre d'exemples, la bande passante et le gain, avoisinant les 9 dBi, offerts par l'antenne selon l'invention en polarisation circulaire s'avèrent plus importants qu'avec une antenne patch. D'autre part, en polarisation circulaire, l'ouverture du lobe principal de l'antenne selon l'invention,est supérieur à 40°.By way of examples, the bandwidth and the gain, close to 9 dBi, offered by the antenna according to the invention in circular polarization prove to be greater than with a patch antenna. On the other hand, in circular polarization, the opening of the main lobe of the antenna according to the invention is greater than 40 °.
En conséquence, l'efficacité présentée par l'antenne à polarisation circulaire selon l'invention au niveau radiation et gain pourrait être valablement mise à profit pour une utilisation en communications radio-fréquence (RFID : « Radio-Frequency Identification » ), par exemple à 868MHz ou à 960 MHz.Consequently, the efficiency exhibited by the circular polarization antenna according to the invention at the radiation and gain level could be validly exploited for use in radio frequency communications (RFID: "Radio Frequency Identification"), for example at 868MHz or 960MHz.
D'autre part, l'antenne à polarisation circulaire selon l'invention pourrait également trouver application en Wi-Fi notamment à 2,4 GHz pour la transmission d'images, par exemple à partir de drones servant à l'observation terrestre, en temps réel et à partir du ciel.On the other hand, the circularly polarized antenna according to the invention could also be used in Wi-Fi in particular at 2.4 GHz for the transmission of images, for example from drones used for terrestrial observation, real time and from the sky.
Par ailleurs, en polarisation linéaire verticale ou horizontale, l'antenne selon l'invention pourra servir à la mesure de découplage de polarisation et notamment à des cas spécifiques où la commutation de polarisation d'antenne s'avère fréquente.Furthermore, in vertical or horizontal linear polarization, the antenna according to the invention may be used for the polarization decoupling measurement and in particular in specific cases where the antenna polarization switching is frequent.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP07447039A EP2009735A1 (en) | 2007-06-22 | 2007-06-22 | Antenna with diversity of polarisation for transmitting and/or receiving audio and/or video signals |
Applications Claiming Priority (1)
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EP07447039A EP2009735A1 (en) | 2007-06-22 | 2007-06-22 | Antenna with diversity of polarisation for transmitting and/or receiving audio and/or video signals |
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EP2009735A1 true EP2009735A1 (en) | 2008-12-31 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07447039A Withdrawn EP2009735A1 (en) | 2007-06-22 | 2007-06-22 | Antenna with diversity of polarisation for transmitting and/or receiving audio and/or video signals |
Country Status (1)
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EP (1) | EP2009735A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2954599A1 (en) * | 2009-12-23 | 2011-06-24 | Thales Sa | Antenna i.e. miniaturized compact antenna, for use in e.g. portable telephone, has radiating element realized from pair of metal strips, and control unit controlling input of input current on metal strips via connection points |
WO2012131126A1 (en) * | 2011-03-29 | 2012-10-04 | Consejo Superior De Investigaciones Científicas (Csic) | Daisy antenna for the emission and reception of linearly and circularly polarized electromagnetic waves |
WO2014076635A1 (en) * | 2012-11-15 | 2014-05-22 | Poynting Antennas (Pty) Limited | Broad band cross polarized antenna arrangement |
CN107546468A (en) * | 2016-06-23 | 2018-01-05 | 鹦鹉无人机股份有限公司 | For the clover of unmanned plane or the WiFi antennas of tapered plane wheel type |
CN113571909A (en) * | 2021-06-30 | 2021-10-29 | 上海中航光电子有限公司 | Antenna unit, antenna device, and electronic apparatus |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1516058A1 (en) * | 1966-04-06 | 1969-07-24 | Telefunken Patent | Turnstile antenna |
DE19603803A1 (en) * | 1996-02-02 | 1997-08-14 | Niels Koch | Cubic quad antenna for mobile or static use |
US6469674B1 (en) * | 2001-05-17 | 2002-10-22 | James Stanley Podger | Double-lemniscate antenna element |
JP2005072716A (en) * | 2003-08-20 | 2005-03-17 | Furukawa Electric Co Ltd:The | Circularly polarized wave antenna |
JP2007020217A (en) * | 2006-09-22 | 2007-01-25 | Matsushita Electric Ind Co Ltd | Antenna device |
US20070063909A1 (en) * | 2004-11-26 | 2007-03-22 | Dx Antenna Company, Limited | Antenna |
-
2007
- 2007-06-22 EP EP07447039A patent/EP2009735A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1516058A1 (en) * | 1966-04-06 | 1969-07-24 | Telefunken Patent | Turnstile antenna |
DE19603803A1 (en) * | 1996-02-02 | 1997-08-14 | Niels Koch | Cubic quad antenna for mobile or static use |
US6469674B1 (en) * | 2001-05-17 | 2002-10-22 | James Stanley Podger | Double-lemniscate antenna element |
JP2005072716A (en) * | 2003-08-20 | 2005-03-17 | Furukawa Electric Co Ltd:The | Circularly polarized wave antenna |
US20070063909A1 (en) * | 2004-11-26 | 2007-03-22 | Dx Antenna Company, Limited | Antenna |
JP2007020217A (en) * | 2006-09-22 | 2007-01-25 | Matsushita Electric Ind Co Ltd | Antenna device |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2954599A1 (en) * | 2009-12-23 | 2011-06-24 | Thales Sa | Antenna i.e. miniaturized compact antenna, for use in e.g. portable telephone, has radiating element realized from pair of metal strips, and control unit controlling input of input current on metal strips via connection points |
WO2012131126A1 (en) * | 2011-03-29 | 2012-10-04 | Consejo Superior De Investigaciones Científicas (Csic) | Daisy antenna for the emission and reception of linearly and circularly polarized electromagnetic waves |
WO2014076635A1 (en) * | 2012-11-15 | 2014-05-22 | Poynting Antennas (Pty) Limited | Broad band cross polarized antenna arrangement |
CN107546468A (en) * | 2016-06-23 | 2018-01-05 | 鹦鹉无人机股份有限公司 | For the clover of unmanned plane or the WiFi antennas of tapered plane wheel type |
CN113571909A (en) * | 2021-06-30 | 2021-10-29 | 上海中航光电子有限公司 | Antenna unit, antenna device, and electronic apparatus |
CN113571909B (en) * | 2021-06-30 | 2024-02-09 | 上海中航光电子有限公司 | Antenna unit, antenna device and electronic equipment |
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