EP2610966B1 - Very-thin broadband compact antenna with dual orthogonal linear polarisations operating in the V/UHF bands - Google Patents

Very-thin broadband compact antenna with dual orthogonal linear polarisations operating in the V/UHF bands Download PDF

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Publication number
EP2610966B1
EP2610966B1 EP12199486.7A EP12199486A EP2610966B1 EP 2610966 B1 EP2610966 B1 EP 2610966B1 EP 12199486 A EP12199486 A EP 12199486A EP 2610966 B1 EP2610966 B1 EP 2610966B1
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EP
European Patent Office
Prior art keywords
antenna
dipoles
mhz
metal plate
comprised
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EP12199486.7A
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German (de)
French (fr)
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EP2610966A1 (en
Inventor
Cyrille Le Meins
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Thales SA
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Thales SA
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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
    • H01Q9/06—Details
    • H01Q9/065—Microstrip dipole antennas
    • 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
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • 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
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole

Definitions

  • the invention relates to a compact broadband antenna with very small thickness and double orthogonal linear polarizations operating in the V / UHF bands.
  • the invention is in the field of antennas and compact broadband antenna systems. These systems are dedicated to applications for receiving and emitting electromagnetic waves in a very wide frequency band.
  • the compact antenna according to the invention is intended to operate in the VHF and UHF bands, that is to say at frequencies between 30 MHz and 3 GHz, and more particularly at frequencies between 30 MHz and 500 MHz.
  • Such antennas are used for various purposes, for example in the field of radiocommunications, and are intended in particular to be integrated into a machine, be it terrestrial, airborne or naval.
  • the document "A novel compact dual-linear Polarized UWB Antenna for VHF / UHF applications” describes a compact broadband antenna of the aforementioned type.
  • the radiating elements of the antenna are curved and meander in order to increase the electrical lengths of the antenna and thus optimize the radio performance at low frequencies.
  • the metal plate of the antenna is disposed on a disk made of a ferrite material. It is at a distance from the radiating elements so that it reflects the electromagnetic waves emitted or received by the antenna at high frequencies.
  • this antenna does not allow use from 30 MHz with acceptable ROS.
  • the antenna constitutes a protruding protruding protruding from the machine when it is arranged on a surface thereof, or imposes to oversize the cavity in which it is arranged, this which is particularly penalizing on certain machines.
  • the radio performance at low frequencies of this antenna should vary depending on the machine on which it is arranged and they will be particularly impacted in the case where the antenna is arranged in a metal cavity.
  • the object of the invention is therefore to solve these problems.
  • the invention relates to an antenna of the aforementioned type characterized in that the radiating elements are all substantially planar, the two dipoles being substantially comprised in the same plane, and in that the absorbent structure is interposed between the metal plate and the dipoles and is arranged in contact with the metal plate.
  • the antenna according to the invention is intended to emit and receive electromagnetic waves whose frequencies are preferably in the entire frequency range 30 MHz - 500 MHz.
  • it is intended to emit and receive electromagnetic waves whose frequencies are in the entire frequency range 30 MHz - 700 MHz.
  • the antenna 2 comprises radiating elements 4, an absorbent structure 6 and a metal plate 8.
  • it comprises means 10 for adapting the impedance and supplying the radiating elements 4.
  • the radiating elements 4 are specific to the emission and reception of electromagnetic waves.
  • the radiating elements 4 are made from an electrically conductive material.
  • the radiating elements 4 are made in printed technology known to those skilled in the art.
  • the antenna 2 thus comprises four radiating elements 4 that are substantially planar and of triangular general shape, and more specifically each in the form of a disk sector.
  • Each radiating element 4 thus has a rounded edge 12 and an opposite peak 14 to said rounded edge 12.
  • Each radiating element 4 has an opening angle ⁇ at its top 14 whose value is substantially 45 °.
  • This value of the opening angle ⁇ makes it possible to optimize the impedance and gain performance of the antenna 2 over the covered bandwidth, while minimizing its bulk.
  • the radiating elements 4 are substantially inscribed in a circle C of center O, the rounded edge 12 of each radiating element belonging substantially to said circle C.
  • the opposite peaks 14 to these rounded edges all point substantially towards the point O.
  • the radiating elements 4 are all substantially included in the same plane P and have substantially the same dimensions.
  • the radiating elements 4 are divided into two dipoles 16A, 16B each comprising two radiating elements 4 diametrically opposed.
  • Each dipole 16A, 16B is symmetrical with respect to said point O and has an axis of symmetry 17A, 17B included in the plane P, passing through O and coincident with the bisector of the apex angle 14 of each of its radiating elements 4.
  • Each of the two dipoles 16A, 16B is specific to the emission and reception of electromagnetic waves having a vertical linear polarization for one and horizontal for the other.
  • the emission and reception of electromagnetic waves having any polarization are then obtained by combining the two linear polarizations either analogically by adding for example a coupling function, or by digital processing this being known to those skilled in the art.
  • each radiating element 4 of a dipole 16A adapted for the transmission / reception of linear polarization waves given is then arranged between the two radiating elements 4 of the dipole 16B adapted for transmitting / receiving electromagnetic waves of complementary linear polarization, as shown in Figure 1 .
  • the preferred radiation direction of the antenna 2 corresponds to an axis AA 'perpendicular to the plane P of the radiating elements 4 and passing through the point O.
  • the dipoles 16A, 16B are substantially inscribed in the circle C.
  • the diameter of the circle C is equal to a fraction of the length of an electromagnetic wave, that is to say that the diameter is equal to ⁇ / n , where ⁇ is the wavelength and n is a strictly positive.
  • n is typically chosen to be 2.
  • the dimensioning of the dipoles of this antenna is then determined as a rule by the ⁇ / 2 ratio independently of the resulting bulk.
  • the diameter of the circle C is taken substantially equal to 330 mm, n being then approximately between 30 and 1.8 respectively for electromagnetic waves of frequency ranging from 30 MHz to 500 MHz.
  • the geometry of the dipoles 16A, 16B has the effect of minimizing the volume they occupy, while having a capacity for transmitting and receiving electromagnetic waves of any polarization from a single antenna 2.
  • the absorbent structure 6 is able to improve the level of impedance matching of the antenna 2 and to increase its directivity by absorbing a part of the rear radiation of the dipoles 16A, 16B of the antenna 2, that is to say radiation emitted in the opposite direction to its preferred radiation direction. It is therefore suitable for optimizing the gain of the antenna 2, particularly at the low frequencies of its frequency band, for example at frequencies between 30 MHz and 200 MHz. In addition, it is suitable for minimizing the size and diameter of the antenna 2.
  • the absorbent structure 6 is interposed between the radiating elements 4 and the metal plate 8. It is then both located near the radiating elements 4 and in contact with the metal plate 8.
  • it comprises an assembly tiles made from a ferrite material known to those skilled in the art.
  • the absorbent structure 6 has a generally cylindrical shape of axis A-A 'and of diameter substantially equal to the diameter of the circle C circumscribing the dipoles 16A, 16B, and more particularly between 330 mm and 334 mm.
  • the absorbent structure 6 has a height substantially between 20 mm and 21 mm, and preferably substantially equal to 20 mm.
  • This value corresponds to a good compromise between the radio performance of ROS and gain between the low and the high frequencies, the congestion resulting from the antenna 2, and the absorption properties related to the characteristics of complex permittivity and complex permeability. the material of the absorbent structure 6.
  • the arrangement of the absorbent structure 6 near the radiating elements 4 and in contact with the metal plate 8 makes it possible to significantly reduce the influence of the machine to which the antenna 2 is integrated on the radio performance at the low frequencies, in particular in the where the antenna 2 is arranged in a metal cavity.
  • the absorbent structure 6 is delimited vertically by a substantially flat upper surface 18 and a lower surface 21 both parallel to the plane P. Said plane P is then located at a distance d from said upper surface 18 of between 1 mm and 2 mm. In addition, the lower surface 21 is arranged in contact with the metal plate 8.
  • This low value of the distance d has the effect of self-adapting the antenna 2 via the means of adaptation and supply, and consequently of causing a decrease in the value of the stationary wave ratio of the antenna.
  • antenna 2 particularly at low frequencies of its frequency band, for example at frequencies between 30 MHz and 200 MHz.
  • the circle C and the absorbent structure 6 both have the same axis of revolution A-A '.
  • the dipoles 16A, 16B and said absorbent structure 6 are thus included in a cylinder of axis AA 'of diameter substantially equal to 330 mm and of height substantially equal to 22 mm.
  • the antenna 2 When the antenna 2 is arranged in a cavity, this allows in particular to minimize the dimensions of said cavity, as will be seen later.
  • the absorbent structure 6 is adapted for the passage of the impedance and power supply means.
  • the absorbent structure 6 defines a passage opening 19 for the passage of the impedance matching means and supply, as will be seen later.
  • This orifice has a generally cylindrical shape of axis A-A 'and of small diameter in front of the diameter of the absorbent structure 6.
  • the metal plate 8 provides ground plane functions as well as mechanical and electrical interface between the antenna 2 and the structure on which the antenna 2 is intended to be integrated.
  • the metal plate 8 is able to provide a reference mass to the various members of the antenna 2 and is adapted to optimize the directivity of the antenna 2 by contributing to the reduction of the rear radiation thereof.
  • the metal plate 8 is adapted to be arranged in contact with a flat surface of a machine to which the antenna 2 is intended to be integrated.
  • the metal plate 8 is made from an electrically conductive material known to those skilled in the art.
  • the metal plate 8 has a diameter of about 350 mm and thus delimits a projection 20 of generally annular shape extending radially relative to the absorbent structure 6 and having a width l substantially equal to 10 mm.
  • the metal plate 8 has an upper surface 22 and a lower surface 23.
  • the upper surface 22 is substantially planar and arranged in contact with the lower surface 21 of the absorbent structure 6. It is also parallel to the plane P of the radiating elements 4. Said surface 22 is then at a distance from said plane P equal to a fraction the length of an electromagnetic wave, that is to say that the distance is equal to ⁇ / m , where ⁇ is the wavelength and m is a strictly positive number.
  • m is typically chosen to be 4 considering that the space between the radiating elements and the reflective plane of the ideal antenna is filled with air and therefore permittivity and permeability equal to 1.
  • the distance from the metal plate to the dipoles is then determined by the ⁇ / 4 ratio independently of the resulting bulk.
  • the distance from the metal plate 8 to the plane P is taken substantially equal to 22 mm, m then being approximately between 450 and 27 for electromagnetic waves of frequency ranging respectively from 30 MHz to 500 MHz.
  • the impedance matching and power supply matching means 10 are adapted to ensure the impedance matching and the supply of the dipoles 16A, 16B of the antenna 2 as well as to symmetrize the currents flowing in the radiating elements 4 .
  • these means 10 comprise two connectors 24, two impedance transformers 26 and electrical contacts 28 connecting the radiating elements 4 to the transformers 26.
  • these means 10 comprise electrical contacts 30, 32 connecting the connectors 24 and the impedance transformers 26, the reference electrical contacts 32 being ground contacts.
  • the connectors 24 are adapted to provide the electrical interface between the antenna 2 and a device (not shown) for transmitting and / or receiving associated therewith.
  • the connectors 24 are arranged through the metal plate 8 opposite the passage opening 19 of the absorbent structure 6.
  • such connectors 24 are intended to be engaged with coaxial cables (not shown), and then have a core 34 and a ground 36 complementary to those of the coaxial cables to which they are connected.
  • each connector 24 is connected to an asymmetrical channel 40 that comprises each impedance transformer 26 via an electrical contact 30 located in the passage opening 19.
  • the mass 36 of each connector 24 is connected to a channel 42 of each transformer 26 via an electrical contact 32 also located in the passage opening 19.
  • the mass 36 of each connector 24 is in electrical continuity with the metal plate 8 via an electrical contact 31 arranged in contact with the lower surface 23 of the metal plate 8.
  • an impedance transformer 26 is adapted to maximize the power transfer between the dipoles 16A, 16B of the antenna 2 and the transmitting and / or receiving device to which the antenna 2 is associated.
  • each impedance transformer 26 is arranged in the passage opening 19 and comprises two symmetrical channels 38 each connected to one of the radiating elements 4 of the corresponding dipole 16 via an electrical contact 28, as well as an asymmetrical channel 40 and a ground path 42, as described above.
  • the electrical contacts 28 are also arranged in the passage opening 19. They are well known to those skilled in the art and will not be described here.
  • the arrangement of the absorbent structure 6 near the radiating elements 4 of the dipoles 16A, 16B makes it possible to reduce the influence of the neighboring objects on the radio performances.
  • the antenna 2 thus has optimized radio performance (impedance, ROS, radiation, directivity and gain) and maximized independence vis-à-vis its environment.
  • the antenna 2 adapted to minimize the volume of the projecting protuberance that it constitutes with respect to the machine when it is integrated with a surface thereof, and to minimize the dimensions of a cavity intended to receive the antenna 2, said cavity being for example made from a metallic material.
  • the radiating elements 4 are fed by the transmitting / receiving device associated with the antenna via the impedance matching and power supply means 10.
  • the dipoles 16A, 16B emit and receive electromagnetic waves having any polarization among a linear polarization, circular and elliptical and having frequencies in the frequency band of the antenna 2.
  • the ROS of antenna 2 is less than 2.35 to 1 for a nominal impedance of 50 Ohms over the frequency range 30 MHz - 500 MHz, that is, it has a very good adaptation of impedance on its frequency band.
  • the gain obtained on one of the dipoles is greater than -8 dBi over the frequency range 200 MHz - 500 MHz, greater than -5 dBi over the frequency range 230 MHz - 470 MHz.
  • this gain is -35 dBi at 30 MHz, -17 dBi at 100 MHz, and -12 dBi at 150 MHz.
  • the antenna 2 has a quasi-unidirectional radio coverage on its frequency band.
  • the impedance matching and supply matching means 10 are integrated in an impedance matching circuit 44, with the exception of the electrical contacts 28 connecting the dipoles 16A. , 16B to said impedance matching circuit 44 and connectors 24.
  • This circuit 44 is made in printed technology known to those skilled in the art and is then disposed in a sole 46 that includes the metal plate 8.
  • the sole 46 comprises a cavity 461 dedicated for this purpose and which is accessible via a removable metal cover 462.
  • the metal plate 8 then defines four cylindrical passage holes 48 located opposite the passage opening 19 of the absorbent structure 6.
  • the passage openings 48 are angularly spaced 90 ° from each other and are each intended for the passage of an electrical contact 28.
  • the electrical contacts 28 are then arranged in the passage orifices 19, 48 so as to connect the dipoles 16A, 16B and the circuit 44.
  • the sole 46 has a generally cylindrical shape of axis A-A 'and of diameter less than or equal to the diameter of the metal plate 8 and comprises a lower surface 50.
  • the connectors 24 are then attached to the impedance matching circuit 44 in the sole 46 so as to project from the lower surface 50, as illustrated in FIG. Figure 7 .
  • the electrical contacts 31 provide electrical continuity between the ground 36 of each connector 24 and the removable metal cover 462.
  • the antenna 2 also comprises a radome 52 able to protect said antenna 2 and to allow the passage of the electromagnetic radiation emitted and received by the antenna 2.
  • the radome 52 has a generally cylindrical shape and is made from a material known to those skilled in the art, such as epoxy glass, polyamide, or peek, etc.
  • the radome 52 is delimited radially by a lateral wall 54 having a thickness less than or equal to the width l of the projection 20 and vertically by a transverse wall 56 of disc shape.
  • the radome 52 is thus adapted to be fixed on the projection 20 in a protective position illustrated on the Figure 8 and in which its axis coincides with the axis A-A '.
  • the radome 52 delimits a cylindrical cavity 58 of dimensions complementary to the dimensions of the cylinder in which are included the dipoles 16A, 16B and the absorbent structure 6.
  • the dimensions of the cavity 58 are increased by distances ⁇ and ⁇ 'ranging from a millimeter to a few millimeters, and corresponding to a day respectively existing between the dipoles 16A, 16B and the transverse wall 56 and between the absorbent structure 6 and the side wall 54 of the radome 52 in the protective position thereof.
  • this cavity 58 thus has a diameter of 330 + 2. approximately ⁇ 'mm and a height of approximately 22 + ⁇ mm.
  • the side wall 54 is fixed on the projection 20 by fixing means (not shown) so that the dipoles 16A, 16B and the absorbent structure 6 are fully included in the cavity 58, as illustrated on the Figure 8 .
  • the antenna 2 provided with its radome 52 is included in a cylinder axis AA 'and of diameter substantially equal to 350 mm.
  • the antenna 2 provided with its radome 52 is adapted to be arranged on a flat surface 60 of a cylindrical cavity 62 provided for this purpose in a machine 64, the metal plate 8 being in contact with said surface 60.
  • the cylindrical cavity 62 has a diameter substantially equal to the diameter of the antenna 2 and a height substantially equal to the height of the radome 52 to which is added the height of the metal plate 8.
  • said surface 60 and said cylindrical cavity 62 are made from a metallic material.
  • an opening 66 for the connection via the connectors 24 of the impedance matching means and power supply to the transmitting / receiving device (not shown) of the antenna 2 associated therewith.

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Description

L'invention concerne une antenne compacte large bande à très faible épaisseur et à double polarisations linéaires orthogonales opérant dans les bandes V/UHF.The invention relates to a compact broadband antenna with very small thickness and double orthogonal linear polarizations operating in the V / UHF bands.

Plus particulièrement, l'invention concerne une antenne d'émission/réception d'ondes électromagnétiques, du type comprenant :

  • deux dipôles orthogonaux entre eux, chaque dipôle comprenant deux éléments rayonnants,
  • une platine métallique, et
  • une structure absorbante.
More particularly, the invention relates to an antenna for transmitting / receiving electromagnetic waves, of the type comprising:
  • two dipoles orthogonal to each other, each dipole comprising two radiating elements,
  • a metal platinum, and
  • an absorbent structure.

L'invention se situe dans le domaine des antennes et des systèmes antennaires compacts à large bande. Ces systèmes sont dédiés à des applications de réception et d'émission d'ondes électromagnétiques dans une très large bande de fréquences. Par exemple, l'antenne compacte selon l'invention est destinée à opérer dans les bandes VHF et UHF, c'est-à-dire à des fréquences comprises entre 30 MHz et 3 GHz, et plus particulièrement à des fréquences comprises entre 30 MHz et 500 MHz.The invention is in the field of antennas and compact broadband antenna systems. These systems are dedicated to applications for receiving and emitting electromagnetic waves in a very wide frequency band. For example, the compact antenna according to the invention is intended to operate in the VHF and UHF bands, that is to say at frequencies between 30 MHz and 3 GHz, and more particularly at frequencies between 30 MHz and 500 MHz.

De telles antennes sont utilisées à diverses fins, par exemple dans le domaine des radiocommunications, et sont notamment destinées à être intégrées à un engin, qu'il soit terrestre, aéroporté ou naval.Such antennas are used for various purposes, for example in the field of radiocommunications, and are intended in particular to be integrated into a machine, be it terrestrial, airborne or naval.

Dès lors, ces antennes sont soumises à de nombreuses contraintes.Therefore, these antennas are subject to many constraints.

Ainsi, elles doivent par exemple :

  • présenter un encombrement réduit,
  • présenter une discrétion visuelle ou une SER, pour Surface Equivalente Radar, faibles,
  • disposer de performances radioélectriques élevées telles qu'un ROS, pour Rapport d'Onde Stationnaire, faible, un gain fort, etc.,
  • être adaptées pour émettre et recevoir des ondes électromagnétiques quelque soit leur polarisation (polarisation linéaire, une polarisation circulaire et une polarisation elliptique), et
  • disposer d'une couverture radioélectrique unidirectionnelle.
Thus, they must for example:
  • have a small footprint,
  • present a visual discretion or a SER, for Surface Equivalent Radar, low,
  • have high radio frequency performance such as ROS, for Stationary Wave Ratio, low, high gain, etc.,
  • be adapted to emit and receive electromagnetic waves irrespective of their polarization (linear polarization, circular polarization and elliptical polarization), and
  • have unidirectional radio coverage.

Enfin, elles doivent respecter le gabarit routier d'engins terrestres et ne pas dégrader l'aérodynamisme d'engins aéroportés auxquels elles sont intégrées et présenter des performances radioélectriques indépendantes vis-à-vis de ceux-ci. Le document de l'art antérieur WO2005/084406 décrit une structure large bande compacte. En outre, ces antennes doivent présenter une très faible épaisseur pour être agencées soit directement sur une des surfaces d'un engin ou dans une cavité prévue à cet effet dans ledit engin, par exemple de telle sorte qu'elles affleurent une surface qu'il comprend.Finally, they must respect the road gauge of land vehicles and not degrade the aerodynamics of airborne vehicles to which they are integrated and present independent radio performances vis-à-vis them. The document of the prior art WO2005 / 084406 describes a compact broadband structure. In addition, these antennas must have a very small thickness to be arranged either directly on one of the surfaces of a vehicle or in a cavity provided for in this effect in said machine, for example so that they are flush with a surface that it comprises.

Ainsi, le document « A novel compact dual-linear Polarized UWB Antenna for VHF/UHF applications » décrit une antenne compacte à large bande du type précité. Les éléments rayonnants de l'antenne sont incurvés et présentent des méandres de façon à augmenter les longueurs électriques de l'antenne et ainsi optimiser les performances radioélectriques aux basses fréquences. En outre, la platine métallique de l'antenne est disposée sur un disque réalisé avec un matériau ferrite. Elle se trouve à une distance des éléments rayonnants de sorte qu'elle réfléchit les ondes électromagnétiques émises ou reçues par l'antenne aux hautes fréquences.Thus, the document "A novel compact dual-linear Polarized UWB Antenna for VHF / UHF applications" describes a compact broadband antenna of the aforementioned type. The radiating elements of the antenna are curved and meander in order to increase the electrical lengths of the antenna and thus optimize the radio performance at low frequencies. In addition, the metal plate of the antenna is disposed on a disk made of a ferrite material. It is at a distance from the radiating elements so that it reflects the electromagnetic waves emitted or received by the antenna at high frequencies.

Toutefois, cette solution ne donne pas entière satisfaction.However, this solution does not give complete satisfaction.

Premièrement, cette antenne ne permet pas une utilisation à partir de 30 MHz avec un ROS acceptable.First, this antenna does not allow use from 30 MHz with acceptable ROS.

Deuxièmement, du fait de la forme incurvée des éléments rayonnants, l'antenne constitue une protubérance importante saillante de l'engin lorsqu'elle est agencée sur une surface de celui-ci, ou impose de surdimensionner la cavité dans laquelle elle est agencée, ce qui s'avère particulièrement pénalisant sur certains engins.Secondly, because of the curved shape of the radiating elements, the antenna constitutes a protruding protruding protruding from the machine when it is arranged on a surface thereof, or imposes to oversize the cavity in which it is arranged, this which is particularly penalizing on certain machines.

Troisièmement, compte-tenu de la conception de l'antenne, les performances radioélectriques aux basses fréquences de cette antenne doivent varier en fonction de l'engin sur lequel elle est agencée et celles-ci seront particulièrement impactées dans le cas où cette antenne est disposée dans une cavité métallique.Third, given the design of the antenna, the radio performance at low frequencies of this antenna should vary depending on the machine on which it is arranged and they will be particularly impacted in the case where the antenna is arranged in a metal cavity.

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

A cet effet, l'invention concerne une antenne du type précité caractérisée en ce que les éléments rayonnants sont tous sensiblement plans, les deux dipôles étant sensiblement compris dans un même plan, et en ce que la structure absorbante est interposée entre la platine métallique et les dipôles et est agencée au contact de la platine métallique.To this end, the invention relates to an antenna of the aforementioned type characterized in that the radiating elements are all substantially planar, the two dipoles being substantially comprised in the same plane, and in that the absorbent structure is interposed between the metal plate and the dipoles and is arranged in contact with the metal plate.

Selon d'autres aspects de l'invention, l'antenne compacte à large bande comprend l'une ou plusieurs des caractéristiques suivantes, prise(s) seule(s) ou selon toute(s) combinaison(s) techniquement possible(s):

  • chaque élément rayonnant présente une forme générale de secteur de disque ;
  • ledit plan est à une distance d de la structure absorbante comprise entre 1 mm et 2mm;
  • elle comprend un circuit d'adaptation d'impédance réalisé en technologie imprimée ;
  • la platine métallique comprend une semelle, le circuit d'adaptation d'impédance étant agencé dans ladite semelle ;
  • elle comprend également un radôme de protection.
  • la structure absorbante présente une forme générale cylindrique ;
  • la hauteur de la structure absorbante est comprise entre 20 mm et 21 mm, et vaut avantageusement 20 mm, et son diamètre est compris entre 330 mm et 334 mm , et vaut avantageusement 330 mm ;
  • les dipôles et la structure absorbante sont intégralement compris dans un cylindre de diamètre sensiblement égal à 330 mm et de hauteur sensiblement égale à 22 mm;
  • les ondes électromagnétiques qu'elle est propre à émettre et recevoir ont des fréquences comprises dans toute la gamme de fréquences 30 MHz - 500 MHz, et avantageusement dans toute la gamme de fréquences 30 MHz - 700 MHz ;
  • elle est propre à émettre et recevoir des ondes électromagnétiques présentant une polarisation quelconque parmi une polarisation linéaire, une polarisation circulaire ou une polarisation elliptique, chaque dipôle étant respectivement propre à l'émission/réception d'ondes électromagnétiques présentant une polarisation linéaire horizontale pour l'un des dipôles et linéaire verticale pour l'autre dipôle.
According to other aspects of the invention, the compact broadband antenna comprises one or more of the following features, taken alone or in any technically possible combination (s). :
  • each radiating element has a general shape of disk sector;
  • said plane is at a distance d from the absorbent structure of between 1 mm and 2 mm;
  • it comprises an impedance matching circuit realized in printed technology;
  • the metal plate comprises a sole, the impedance matching circuit being arranged in said sole;
  • it also includes a radome protection.
  • the absorbent structure has a generally cylindrical shape;
  • the height of the absorbent structure is between 20 mm and 21 mm, and is advantageously 20 mm, and its diameter is between 330 mm and 334 mm, and is advantageously 330 mm;
  • the dipoles and the absorbent structure are integrally comprised in a cylinder of diameter substantially equal to 330 mm and of height substantially equal to 22 mm;
  • the electromagnetic waves that it is capable of transmitting and receiving have frequencies in the entire frequency range 30 MHz - 500 MHz, and advantageously throughout the frequency range 30 MHz - 700 MHz;
  • it is capable of transmitting and receiving electromagnetic waves having any polarization among a linear polarization, a circular polarization or an elliptical polarization, each dipole being respectively specific to the emission / reception of electromagnetic waves having a horizontal linear polarization for the one of the dipoles and vertical linear for the other dipole.

En outre, l'invention concerne un engin terrestre, aéroporté ou naval du type comportant :

  • une surface plane et/ ou une cavité,
  • une antenne telle que décrite plus haut et agencée sur ladite surface et/ou dans ladite cavité.
In addition, the invention relates to a land vehicle, airborne or naval of the type comprising:
  • a flat surface and / or a cavity,
  • an antenna as described above and arranged on said surface and / or in said cavity.

Selon d'autres aspects de l'invention, l'engin comprend l'une ou plusieurs des caractéristiques suivantes, prise(s) seule(s) ou selon toute(s) combinaison(s) techniquement possible(s):

  • la surface plane et/ou la cavité sont réalisées à partir d'un matériau métallique.
According to other aspects of the invention, the machine comprises one or more of the following characteristics, taken alone or according to any technically possible combination (s):
  • the flat surface and / or the cavity are made from a metallic material.

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

  • la Figure 1 est une vue en perspective d'une antenne compacte à large bande selon un premier mode de réalisation de l'invention ;
  • la Figure 2 est une vue en coupe de l'antenne de la Figure 1 selon le plan II ;
  • la Figure 3 est une courbe de représentation du Rapport d'Onde Stationnaire d'un des deux dipôles d'une antenne compacte à large bande selon l'invention en fonction de la fréquence en MHz ;
  • la Figure 4 est une courbe de représentation de l'isolation entre les deux dipôles d'une antenne compacte à large bande selon l'invention en fonction de la fréquence en MHz;
  • la Figure 5 est une courbe de représentation du gain de l'un des deux dipôles d'une antenne compacte à large bande selon l'invention en fonction de la fréquence en MHz ;
  • la Figure 6 est des diagrammes de rayonnement selon le plan azimutal de l'un des deux dipôles d'une antenne compacte à large bande selon l'invention pour des fréquences valant 30 MHz, 50 MHz, 100 MHz, 300 MHz et 500 MHz respectivement ;
  • la Figure 7 est une vue de côté d'une antenne compacte à large bande selon un deuxième mode de réalisation de l'invention ;
  • la Figure 8 est une vue de côté d'une antenne compacte à large bande selon l'invention comprenant un radôme de protection ; et
  • la Figure 9 est une représentation schématique de l'antenne de la Figure 8 agencée dans une cavité ménagée dans un engin;
The invention will be better understood with the aid of the description which follows, given solely by way of example and with reference to the appended drawings in which:
  • the Figure 1 is a perspective view of a compact broadband antenna according to a first embodiment of the invention;
  • the Figure 2 is a sectional view of the antenna of the Figure 1 according to plan II;
  • the Figure 3 is a curve representing the Stationary Wave Ratio of one of the two dipoles of a compact broadband antenna according to the invention as a function of the frequency in MHz;
  • the Figure 4 is a representation curve of the insulation between the two dipoles of a compact broadband antenna according to the invention as a function of the frequency in MHz;
  • the Figure 5 is a representation curve of the gain of one of the two dipoles of a compact broadband antenna according to the invention as a function of the frequency in MHz;
  • the Figure 6 is azimuthal radiation patterns of one of the two dipoles of a compact broadband antenna according to the invention for frequencies of 30 MHz, 50 MHz, 100 MHz, 300 MHz and 500 MHz respectively;
  • the Figure 7 is a side view of a compact broadband antenna according to a second embodiment of the invention;
  • the Figure 8 is a side view of a compact broadband antenna according to the invention comprising a protective radome; and
  • the Figure 9 is a schematic representation of the antenna of the Figure 8 arranged in a cavity formed in a machine;

Dans tout ce qui suit, les expressions « inférieur » et « supérieur » sont utilisées en référence aux Figures et non de façon limitative.In all that follows, the terms "lower" and "higher" are used with reference to the figures and not in a limiting manner.

L'antenne selon l'invention est destinée à émettre et recevoir des ondes électromagnétiques dont les fréquences sont préférentiellement comprises dans toute la gamme de fréquences 30 MHz - 500 MHz. Avantageusement, elle est destinée à émettre et recevoir des ondes électromagnétiques dont les fréquences sont comprises dans toute la gamme de fréquences 30 MHz - 700 MHz.The antenna according to the invention is intended to emit and receive electromagnetic waves whose frequencies are preferably in the entire frequency range 30 MHz - 500 MHz. Advantageously, it is intended to emit and receive electromagnetic waves whose frequencies are in the entire frequency range 30 MHz - 700 MHz.

En référence aux Figures 1 et 2, l'antenne 2 comprend des éléments rayonnants 4, une structure absorbante 6 et une platine métallique 8. En outre, elle comprend des moyens 10 d'adaptation d'impédance et d'alimentation des éléments rayonnants 4.With reference to Figures 1 and 2 the antenna 2 comprises radiating elements 4, an absorbent structure 6 and a metal plate 8. In addition, it comprises means 10 for adapting the impedance and supplying the radiating elements 4.

Les éléments rayonnants 4 sont propres à l'émission et à la réception des ondes électromagnétiques.The radiating elements 4 are specific to the emission and reception of electromagnetic waves.

A cet effet, les éléments rayonnants 4 sont réalisés à partir d'un matériau électriquement conducteur.For this purpose, the radiating elements 4 are made from an electrically conductive material.

Dans l'exemple de la Figure 1, les éléments rayonnants 4 sont réalisés en technologie imprimée connue de l'homme du métier.In the example of the Figure 1 , the radiating elements 4 are made in printed technology known to those skilled in the art.

L'antenne 2 comprend ainsi quatre éléments rayonnants 4 sensiblement plans et de forme générale triangulaire, et plus précisément chacun en forme de secteur de disque. Chaque élément rayonnant 4 présente ainsi un bord arrondi 12 et un sommet opposé 14 audit bord arrondi 12. Chaque élément rayonnant 4 présente un angle d'ouverture α à son sommet 14 dont la valeur vaut sensiblement 45°.The antenna 2 thus comprises four radiating elements 4 that are substantially planar and of triangular general shape, and more specifically each in the form of a disk sector. Each radiating element 4 thus has a rounded edge 12 and an opposite peak 14 to said rounded edge 12. Each radiating element 4 has an opening angle α at its top 14 whose value is substantially 45 °.

Cette valeur de l'angle d'ouverture α permet d'optimiser les performances d'impédance et de gain de l'antenne 2 sur la largeur de bande couverte, tout en minimisant son encombrement.This value of the opening angle α makes it possible to optimize the impedance and gain performance of the antenna 2 over the covered bandwidth, while minimizing its bulk.

Les éléments rayonnants 4 sont sensiblement inscrits dans un cercle C de centre O, le bord arrondi 12 de chaque élément rayonnant appartenant sensiblement audit cercle C. En outre, les sommets opposés 14 à ces bords arrondis pointent tous sensiblement vers le point O.The radiating elements 4 are substantially inscribed in a circle C of center O, the rounded edge 12 of each radiating element belonging substantially to said circle C. In addition, the opposite peaks 14 to these rounded edges all point substantially towards the point O.

Les éléments rayonnants 4 sont tous sensiblement compris dans un même plan P et présentent sensiblement les mêmes dimensions.The radiating elements 4 are all substantially included in the same plane P and have substantially the same dimensions.

Les éléments rayonnants 4 sont répartis en deux dipôles 16A, 16B comprenant chacun deux éléments rayonnants 4 diamétralement opposés. Chaque dipôle 16A, 16B est symétrique par rapport audit point O et présente un axe de symétrie 17A, 17B compris dans le plan P, passant par O et confondu avec la bissectrice de l'angle au sommet 14 de chacun de ses éléments rayonnants 4.The radiating elements 4 are divided into two dipoles 16A, 16B each comprising two radiating elements 4 diametrically opposed. Each dipole 16A, 16B is symmetrical with respect to said point O and has an axis of symmetry 17A, 17B included in the plane P, passing through O and coincident with the bisector of the apex angle 14 of each of its radiating elements 4.

Chacun des deux dipôles 16A, 16B est propre à l'émission et la réception d'ondes électromagnétiques présentant une polarisation linéaire verticale pour l'un et horizontale pour l'autre. L'émission et la réception d'ondes électromagnétiques présentant une polarisation quelconque (polarisation linéaire, polarisation circulaire ou polarisation elliptique) sont alors obtenues par combinaison des deux polarisations linéaires soit de manière analogique en ajoutant par exemple une fonction de couplage, soit par traitement numérique, ceci étant connu de l'homme du métier.Each of the two dipoles 16A, 16B is specific to the emission and reception of electromagnetic waves having a vertical linear polarization for one and horizontal for the other. The emission and reception of electromagnetic waves having any polarization (linear polarization, circular polarization or elliptical polarization) are then obtained by combining the two linear polarizations either analogically by adding for example a coupling function, or by digital processing this being known to those skilled in the art.

A cet effet, les deux dipôles 16A, 16B sont orthogonaux, c'est-à-dire que leurs axes de symétrie 17A, 17B sont orthogonaux. En outre, chaque élément rayonnant 4 d'un dipôle 16A adapté pour l'émission/réception d'ondes de polarisation linéaire donnée est alors agencé entre les deux éléments rayonnants 4 du dipôle 16B adapté pour l'émission/réception d'ondes électromagnétiques de polarisation linéaire complémentaire, comme illustré sur la Figure 1.For this purpose, the two dipoles 16A, 16B are orthogonal, that is to say that their axes of symmetry 17A, 17B are orthogonal. In addition, each radiating element 4 of a dipole 16A adapted for the transmission / reception of linear polarization waves given is then arranged between the two radiating elements 4 of the dipole 16B adapted for transmitting / receiving electromagnetic waves of complementary linear polarization, as shown in Figure 1 .

En référence aux Figures 1 et 2, la direction de rayonnement privilégiée de l'antenne 2 correspond à un axe A-A' perpendiculaire au plan P des éléments rayonnants 4 et passant par le point O.With reference to Figures 1 and 2 , the preferred radiation direction of the antenna 2 corresponds to an axis AA 'perpendicular to the plane P of the radiating elements 4 and passing through the point O.

Toujours en référence à la Figure 1, les dipôles 16A, 16B sont sensiblement inscrits dans le cercle C.Still referring to the Figure 1 , the dipoles 16A, 16B are substantially inscribed in the circle C.

Le diamètre du cercle C est égal à une fraction de la longueur d'une onde électromagnétique, c'est-à-dire que le diamètre est égal à λ / n , où λ est la longueur d'onde et n est un nombre strictement positif.The diameter of the circle C is equal to a fraction of the length of an electromagnetic wave, that is to say that the diameter is equal to λ / n , where λ is the wavelength and n is a strictly positive.

Pour une antenne idéale de faible largeur de bande centrée autour d'une longueur d'onde λ, n est typiquement choisi égal à 2.For an ideal low-bandwidth antenna centered around a wavelength λ , n is typically chosen to be 2.

Le dimensionnement des dipôles de cette antenne est alors déterminé en règle générale par le ratio λ /2 indépendamment de l'encombrement résultant.The dimensioning of the dipoles of this antenna is then determined as a rule by the λ / 2 ratio independently of the resulting bulk.

Or, les contraintes d'encombrement et de largeur de bande auxquelles l'antenne 2 est destinée à répondre se traduisent par un écart important avec ce cas de figure.However, the congestion and bandwidth constraints to which the antenna 2 is intended to respond result in a significant difference with this case.

Dans le mode de réalisation considéré, le diamètre du cercle C est pris sensiblement égal à 330 mm, n étant alors compris approximativement entre 30 et 1,8 respectivement pour des ondes électromagnétiques de fréquence allant de 30 MHz à 500 MHz.In the embodiment considered, the diameter of the circle C is taken substantially equal to 330 mm, n being then approximately between 30 and 1.8 respectively for electromagnetic waves of frequency ranging from 30 MHz to 500 MHz.

La géométrie des dipôles 16A, 16B a notamment pour effet de minimiser le volume qu'ils occupent, tout en disposant d'une capacité d'émission et de réception d'ondes électromagnétiques de polarisation quelconque à partir d'une seule antenne 2.The geometry of the dipoles 16A, 16B has the effect of minimizing the volume they occupy, while having a capacity for transmitting and receiving electromagnetic waves of any polarization from a single antenna 2.

La structure absorbante 6 est propre à améliorer le niveau d'adaptation d'impédance de l'antenne 2 et à augmenter sa directivité en absorbant une partie du rayonnement arrière des dipôles 16A, 16B de l'antenne 2, c'est-à-dire du rayonnement émis dans la direction opposée à sa direction de rayonnement privilégiée. Elle est par conséquent propre à optimiser le gain de l'antenne 2, particulièrement aux basses fréquences de sa bande de fréquence, par exemple aux fréquences comprises entre 30 MHz et 200 MHz. En outre, elle est propre à minimiser l'encombrement en diamètre et en épaisseur de l'antenne 2.The absorbent structure 6 is able to improve the level of impedance matching of the antenna 2 and to increase its directivity by absorbing a part of the rear radiation of the dipoles 16A, 16B of the antenna 2, that is to say radiation emitted in the opposite direction to its preferred radiation direction. It is therefore suitable for optimizing the gain of the antenna 2, particularly at the low frequencies of its frequency band, for example at frequencies between 30 MHz and 200 MHz. In addition, it is suitable for minimizing the size and diameter of the antenna 2.

A cet effet, la structure absorbante 6 est interposée entre les éléments rayonnants 4 et la platine métallique 8. Elle est alors à la fois située à proximité des éléments rayonnants 4 et au contact de la platine métallique 8. En outre, elle comprend un assemblage de tuiles réalisées à partir d'un matériau de type ferrite connu de l'homme du métier.For this purpose, the absorbent structure 6 is interposed between the radiating elements 4 and the metal plate 8. It is then both located near the radiating elements 4 and in contact with the metal plate 8. In addition, it comprises an assembly tiles made from a ferrite material known to those skilled in the art.

La structure absorbante 6 présente une forme générale cylindrique d'axe A-A' et de diamètre sensiblement égal au diamètre du cercle C circonscrit aux dipôles 16A, 16B, et plus particulièrement compris entre 330 mm et 334 mm.The absorbent structure 6 has a generally cylindrical shape of axis A-A 'and of diameter substantially equal to the diameter of the circle C circumscribing the dipoles 16A, 16B, and more particularly between 330 mm and 334 mm.

Dans l'exemple des Figures 1 et 2, elle présente un diamètre sensiblement égal à 330 mm.In the example of Figures 1 and 2 it has a diameter substantially equal to 330 mm.

Par ailleurs, la structure absorbante 6 présente une hauteur sensiblement comprise entre 20 mm et 21 mm, et avantageusement sensiblement égale à 20 mm.Furthermore, the absorbent structure 6 has a height substantially between 20 mm and 21 mm, and preferably substantially equal to 20 mm.

Cette valeur correspond à un bon compromis entre les performances radioélectriques de ROS et de gain entre les basses et les hautes fréquences, l'encombrement résultant de l'antenne 2, et les propriétés d'absorption liées aux caractéristiques de permittivité complexe et de perméabilité complexe du matériau de la structure absorbante 6.This value corresponds to a good compromise between the radio performance of ROS and gain between the low and the high frequencies, the congestion resulting from the antenna 2, and the absorption properties related to the characteristics of complex permittivity and complex permeability. the material of the absorbent structure 6.

La disposition de la structure absorbante 6 à proximité des éléments rayonnants 4 et au contact de la platine métallique 8 permet de réduire significativement l'influence de l'engin auquel l'antenne 2 est intégrée sur les performances radioélectriques aux basses fréquences, notamment dans le cas où l'antenne 2 est agencée dans une cavité métallique.The arrangement of the absorbent structure 6 near the radiating elements 4 and in contact with the metal plate 8 makes it possible to significantly reduce the influence of the machine to which the antenna 2 is integrated on the radio performance at the low frequencies, in particular in the where the antenna 2 is arranged in a metal cavity.

La structure absorbante 6 est délimitée verticalement par une surface supérieure 18 sensiblement plane et une surface inférieure 21 toutes deux parallèles au plan P. Ledit plan P est alors situé à une distance d de ladite surface supérieure 18 comprise entre 1 mm et 2 mm. En outre, la surface inférieure 21 est disposée au contact de la platine métallique 8.The absorbent structure 6 is delimited vertically by a substantially flat upper surface 18 and a lower surface 21 both parallel to the plane P. Said plane P is then located at a distance d from said upper surface 18 of between 1 mm and 2 mm. In addition, the lower surface 21 is arranged in contact with the metal plate 8.

Cette faible valeur de la distance d a pour effet d'auto-adapter l'antenne 2 via les moyens 10 d'adaptation et d'alimentation, et par conséquent d'engendrer une diminution de la valeur du Rapport d'Onde Stationnaire de l'antenne 2 particulièrement aux basses fréquences de sa bande de fréquence, par exemple aux fréquences comprises entre 30 MHz et 200 MHz.This low value of the distance d has the effect of self-adapting the antenna 2 via the means of adaptation and supply, and consequently of causing a decrease in the value of the stationary wave ratio of the antenna. antenna 2 particularly at low frequencies of its frequency band, for example at frequencies between 30 MHz and 200 MHz.

Le cercle C et la structure absorbante 6 ont tous deux le même axe de révolution A-A'. Dans le mode de réalisation de la Figure 1, les dipôles 16A, 16B et ladite structure absorbante 6 sont ainsi compris dans un cylindre d'axe A-A' de diamètre sensiblement égal à 330 mm et de hauteur sensiblement égale à 22 mm.The circle C and the absorbent structure 6 both have the same axis of revolution A-A '. In the embodiment of the Figure 1 , the dipoles 16A, 16B and said absorbent structure 6 are thus included in a cylinder of axis AA 'of diameter substantially equal to 330 mm and of height substantially equal to 22 mm.

Lorsque l'antenne 2 est agencée dans une cavité, ceci permet notamment de minimiser les dimensions de ladite cavité, comme on le verra par la suite.When the antenna 2 is arranged in a cavity, this allows in particular to minimize the dimensions of said cavity, as will be seen later.

La structure absorbante 6 est adaptée pour le passage des moyens 10 d'impédance et d'alimentation. A cet effet, la structure absorbante 6 délimite un orifice de passage 19 pour le passage des moyens 10 d'adaptation d'impédance et d'alimentation, comme on le verra par la suite. Cet orifice présente une forme générale cylindrique d'axe A-A' et de diamètre faible devant le diamètre de la structure absorbante 6.The absorbent structure 6 is adapted for the passage of the impedance and power supply means. For this purpose, the absorbent structure 6 defines a passage opening 19 for the passage of the impedance matching means and supply, as will be seen later. This orifice has a generally cylindrical shape of axis A-A 'and of small diameter in front of the diameter of the absorbent structure 6.

La platine métallique 8 assure les fonctions de plan masse ainsi que d'interface mécanique et électrique entre l'antenne 2 et la structure sur laquelle l'antenne 2 est destinée à être intégrée.The metal plate 8 provides ground plane functions as well as mechanical and electrical interface between the antenna 2 and the structure on which the antenna 2 is intended to be integrated.

La platine métallique 8 est propre à fournir une référence de masse aux différents organes de l'antenne 2 et est propre à optimiser la directivité de l'antenne 2 en contribuant à la réduction du rayonnement arrière de celle-ci.The metal plate 8 is able to provide a reference mass to the various members of the antenna 2 and is adapted to optimize the directivity of the antenna 2 by contributing to the reduction of the rear radiation thereof.

En outre, la platine métallique 8 est propre à être agencée au contact d'une surface plane d'un engin auquel l'antenne 2 est destinée à être intégrée.In addition, the metal plate 8 is adapted to be arranged in contact with a flat surface of a machine to which the antenna 2 is intended to be integrated.

A cet effet, la platine métallique 8 est réalisée à partir d'un matériau électriquement conducteur connu de l'homme du métier.For this purpose, the metal plate 8 is made from an electrically conductive material known to those skilled in the art.

En outre, elle présente une forme générale discoïdale d'axe A-A' et est agencée au contact de la structure absorbante 6.In addition, it has a generally discoidal shape of axis A-A 'and is arranged in contact with the absorbent structure 6.

Dans l'exemple des Figures 1 et 2, la platine métallique 8 présente un diamètre de 350 mm environ et délimite ainsi une saillie 20 de forme générale annulaire s'étendant radialement par rapport à la structure absorbante 6 et présentant une largeur l sensiblement égale à 10 mm.In the example of Figures 1 and 2 , the metal plate 8 has a diameter of about 350 mm and thus delimits a projection 20 of generally annular shape extending radially relative to the absorbent structure 6 and having a width l substantially equal to 10 mm.

La platine métallique 8 présente une surface supérieure 22 ainsi qu'une surface inférieure 23.The metal plate 8 has an upper surface 22 and a lower surface 23.

La surface supérieure 22 est sensiblement plane et agencée au contact de la surface inférieure 21 de la structure absorbante 6. Elle est en outre parallèle au plan P des éléments rayonnants 4. Ladite surface 22 est alors à une distance dudit plan P égale à une fraction de la longueur d'une onde électromagnétique, c'est-à-dire que la distance est égale à λ / m , où λ est la longueur d'onde et m est un nombre strictement positif.The upper surface 22 is substantially planar and arranged in contact with the lower surface 21 of the absorbent structure 6. It is also parallel to the plane P of the radiating elements 4. Said surface 22 is then at a distance from said plane P equal to a fraction the length of an electromagnetic wave, that is to say that the distance is equal to λ / m , where λ is the wavelength and m is a strictly positive number.

Pour une antenne idéale de faible largeur de bande centrée autour d'une longueur d'onde λ, m est typiquement choisi égal à 4 en considérant que l'espace entre les éléments rayonnants et le plan réflecteur de l'antenne idéale est rempli d'air et donc de permittivité et de perméabilité égales à 1 . La distance de la platine métallique aux dipôles est alors déterminée par le ratio λ /4 indépendamment de l'encombrement résultant.For an ideal low-bandwidth antenna centered around a wavelength λ , m is typically chosen to be 4 considering that the space between the radiating elements and the reflective plane of the ideal antenna is filled with air and therefore permittivity and permeability equal to 1. The distance from the metal plate to the dipoles is then determined by the λ / 4 ratio independently of the resulting bulk.

Or, les contraintes d'encombrement et de largeur de bande auxquelles l'antenne 2 selon l'invention répond se traduisent par un écart important avec ce cas de figure.However, the congestion and bandwidth constraints to which the antenna 2 according to the invention responds result in a significant difference with this case.

Ainsi, dans le mode de réalisation des Figures 1 et 2, la distance de la platine métallique 8 au plan P est prise sensiblement égale à 22 mm, m étant alors compris approximativement entre 450 et 27 pour des ondes électromagnétiques de fréquence allant respectivement de 30 MHz à 500 MHz.Thus, in the embodiment of Figures 1 and 2 , the distance from the metal plate 8 to the plane P is taken substantially equal to 22 mm, m then being approximately between 450 and 27 for electromagnetic waves of frequency ranging respectively from 30 MHz to 500 MHz.

Les moyens 10 d'adaptation d'impédance et d'alimentation sont propres à assurer l'adaptation d'impédance et l'alimentation des dipôles 16A, 16B de l'antenne 2 ainsi qu'à symétriser les courants circulant dans les éléments rayonnants 4.The impedance matching and power supply matching means 10 are adapted to ensure the impedance matching and the supply of the dipoles 16A, 16B of the antenna 2 as well as to symmetrize the currents flowing in the radiating elements 4 .

A cet effet, ces moyens 10 comprennent deux connecteurs 24, deux transformateurs d'impédance 26 et des contacts électriques 28 raccordant les éléments rayonnant 4 aux transformateurs 26. En outre, ces moyens 10 comprennent des contacts électriques 30, 32 raccordant les connecteurs 24 et les transformateurs d'impédance 26, les contacts électriques de référence 32 étant des contacts de masse.For this purpose, these means 10 comprise two connectors 24, two impedance transformers 26 and electrical contacts 28 connecting the radiating elements 4 to the transformers 26. In addition, these means 10 comprise electrical contacts 30, 32 connecting the connectors 24 and the impedance transformers 26, the reference electrical contacts 32 being ground contacts.

Les connecteurs 24 sont adaptés pour assurer l'interface électrique entre l'antenne 2 et un dispositif (non représenté) d'émission et/ou de réception qui lui est associé.The connectors 24 are adapted to provide the electrical interface between the antenna 2 and a device (not shown) for transmitting and / or receiving associated therewith.

Les connecteurs 24 sont agencés à travers la platine métallique 8 en regard de l'orifice de passage 19 de la structure absorbante 6.The connectors 24 are arranged through the metal plate 8 opposite the passage opening 19 of the absorbent structure 6.

De manière connue, de tels connecteurs 24 sont destinés à être mis en prise avec des câbles coaxiaux (non représentés), et présentent alors une âme 34 et une masse 36 complémentaires de celles des câbles coaxiaux auxquels ils sont raccordés.In known manner, such connectors 24 are intended to be engaged with coaxial cables (not shown), and then have a core 34 and a ground 36 complementary to those of the coaxial cables to which they are connected.

Dans le mode de réalisation de la Figure 2, l'âme 34 de chaque connecteur 24 est raccordée à une voie asymétrique 40 que comprend chaque transformateur d'impédance 26 via un contact électrique 30 situé dans l'orifice de passage 19. La masse 36 de chaque connecteur 24 est raccordée à une voie de masse 42 de chaque transformateur 26 via un contact électrique 32 également situé dans l'orifice de passage 19. La masse 36 de chaque connecteur 24 est en continuité électrique avec la platine métallique 8 via un contact électrique 31 agencé au contact de la surface inférieure 23 de la platine métallique 8.In the embodiment of the Figure 2 , the core 34 of each connector 24 is connected to an asymmetrical channel 40 that comprises each impedance transformer 26 via an electrical contact 30 located in the passage opening 19. The mass 36 of each connector 24 is connected to a channel 42 of each transformer 26 via an electrical contact 32 also located in the passage opening 19. The mass 36 of each connector 24 is in electrical continuity with the metal plate 8 via an electrical contact 31 arranged in contact with the lower surface 23 of the metal plate 8.

De tels contacts électriques 30, 31, 32 sont bien connus de l'homme du métier et ne seront pas décrits ici.Such electrical contacts 30, 31, 32 are well known to those skilled in the art and will not be described here.

De manière connue, un transformateur d'impédance 26 est adapté pour maximiser le transfert de puissance entre les dipôles 16A, 16B de l'antenne 2 et le dispositif d'émission et/ou de réception auquel l'antenne 2 est associée.In known manner, an impedance transformer 26 is adapted to maximize the power transfer between the dipoles 16A, 16B of the antenna 2 and the transmitting and / or receiving device to which the antenna 2 is associated.

A chaque dipôle 16A, 16B est associé un transformateur d'impédance 26.At each dipole 16A, 16B is associated an impedance transformer 26.

Comme illustré sur la Figure 2, chaque transformateur d'impédance 26 est agencé dans l'orifice de passage 19 et comprend deux voies symétriques 38 raccordées chacune à l'un des éléments rayonnants 4 du dipôle 16 correspondant via un contact électrique 28, ainsi qu'une voie asymétrique 40 et une voie de masse 42, comme décrit ci-dessus.As illustrated on the Figure 2 , each impedance transformer 26 is arranged in the passage opening 19 and comprises two symmetrical channels 38 each connected to one of the radiating elements 4 of the corresponding dipole 16 via an electrical contact 28, as well as an asymmetrical channel 40 and a ground path 42, as described above.

Les contacts électriques 28 sont également agencés dans l'orifice de passage 19. Ils sont bien connus de l'homme du métier et ne seront pas décrits ici.The electrical contacts 28 are also arranged in the passage opening 19. They are well known to those skilled in the art and will not be described here.

Dans l'antenne 2 selon l'invention, la géométrie, les dimensions, les propriétés et la disposition relative des éléments rayonnants 4, de la structure absorbante 6 et de la platine métallique 8 permettent de :

  1. (i) minimiser l'encombrement de l'antenne 2 en aboutissant notamment à une épaisseur très réduite. L'antenne 2 présente des dimensions très petites devant les longueurs d'onde des ondes électromagnétiques qu'elle est propre à émettre et recevoir. En outre, la planéité des éléments rayonnants 4 et les géométries et les dimensions de la structure absorbante 6 et de la platine métallique 8 permettent de minimiser le volume qu'occupe l'antenne 2,
  2. (ii) maximiser la réduction du rayonnement arrière de l'antenne 2. Ceci est obtenu par absorption du rayonnement arrière des dipôles 16A, 16B grâce à la structure absorbante 6. Le plaquage de la structure absorbante 6 sur la platine 8 permet en outre d'atténuer les courants sur la platine métallique 8 engendrés par le rayonnement arrière des dipôles 16A, 16B et qui, s'ils n'étaient pas atténués, rerayonneraient et interféreraient avec le rayonnement dans la direction privilégiée de l'antenne 2.
In the antenna 2 according to the invention, the geometry, the dimensions, the properties and the relative arrangement of the radiating elements 4, the absorbent structure 6 and the metal plate 8 make it possible to:
  1. (i) minimize the size of the antenna 2, in particular resulting in a very small thickness. The antenna 2 has very small dimensions in front of the wavelengths of the electromagnetic waves that it is suitable for transmitting and receiving. In addition, the flatness of the radiating elements 4 and the geometries and dimensions of the absorbent structure 6 and the metal plate 8 make it possible to minimize the volume occupied by the antenna 2,
  2. (ii) maximize the reduction of the back radiation of the antenna 2. This is obtained by absorbing the back radiation of the dipoles 16A, 16B through the absorbent structure 6. The plating of the absorbent structure 6 on the plate 8 also allows to attenuate the currents on the metal plate 8 generated by the rear radiation of the dipoles 16A, 16B and which, if not attenuated, would re-radiate and interfere with the radiation in the preferred direction of the antenna 2.

La disposition de la structure absorbante 6 à proximité des éléments rayonnants 4 des dipôles 16A, 16B permet de réduire l'influence des objets avoisinants sur les performances radioélectriques. L'antenne 2 présente ainsi des performances radioélectriques optimisées (Impédance, ROS, rayonnement, directivité et gain) et une indépendance maximisée vis-à-vis de son environnement.The arrangement of the absorbent structure 6 near the radiating elements 4 of the dipoles 16A, 16B makes it possible to reduce the influence of the neighboring objects on the radio performances. The antenna 2 thus has optimized radio performance (impedance, ROS, radiation, directivity and gain) and maximized independence vis-à-vis its environment.

Ces caractéristiques (i) et (ii) combinées rendent l'antenne 2 adaptée pour minimiser le volume de la protubérance saillante qu'elle constitue par rapport à l'engin lorsqu'elle est intégrée à une surface de celui-ci, et pour minimiser les dimensions d'une cavité destinée à recevoir l'antenne 2, ladite cavité étant par exemple réalisée à partir d'un matériau métallique.These characteristics (i) and (ii) combined make the antenna 2 adapted to minimize the volume of the projecting protuberance that it constitutes with respect to the machine when it is integrated with a surface thereof, and to minimize the dimensions of a cavity intended to receive the antenna 2, said cavity being for example made from a metallic material.

En référence aux Figures 1 et 2, lors du fonctionnement de l'antenne 2, les éléments rayonnants 4 sont alimentés par le dispositif d'émission/réception associé à l'antenne via les moyens 10 d'adaptation d'impédance et d'alimentation.With reference to Figures 1 and 2 during the operation of the antenna 2, the radiating elements 4 are fed by the transmitting / receiving device associated with the antenna via the impedance matching and power supply means 10.

Les dipôles 16A, 16B émettent et reçoivent des ondes électromagnétiques présentant une polarisation quelconque parmi une polarisation linéaire, circulaire et elliptique et présentant des fréquences comprises dans la bande de fréquences de l'antenne 2.The dipoles 16A, 16B emit and receive electromagnetic waves having any polarization among a linear polarization, circular and elliptical and having frequencies in the frequency band of the antenna 2.

Ces ondes sont alors émises et reçues préférentiellement selon la direction d'émission A-A' de l'antenne 2.These waves are then transmitted and received preferentially in the transmission direction A-A 'of the antenna 2.

En référence à la Figure 3, le ROS de l'antenne 2 est inférieur à 2,35 pour 1 pour une impédance nominale de 50 Ohms sur la plage de fréquences 30 MHz - 500 MHz, c'est-à-dire qu'elle présente une très bonne adaptation d'impédance sur sa bande de fréquence.With reference to the Figure 3 , the ROS of antenna 2 is less than 2.35 to 1 for a nominal impedance of 50 Ohms over the frequency range 30 MHz - 500 MHz, that is, it has a very good adaptation of impedance on its frequency band.

En référence à la Figure 4, qui est une courbe représentative du découplage entre les deux dipôles 16A, 16B en fonction de la fréquence, on constate que l'isolation entre les deux dipôles 16A, 16B est supérieure à 30 dB sur la bande de fréquences de l'antenne 2.With reference to the Figure 4 , which is a curve representative of the decoupling between the two dipoles 16A, 16B as a function of the frequency, it is found that the insulation between the two dipoles 16A, 16B is greater than 30 dB on the frequency band of the antenna 2.

En référence à la Figure 5, on constate que le gain obtenu sur l'un des dipôles est supérieur à -8 dBi sur la plage de fréquences 200 MHz - 500 MHz, supérieur à -5 dBi sur la plage de fréquences 230 MHz - 470 MHz. En outre, ce gain vaut - 35 dBi à 30 MHz, - 17 dBi à 100 MHz, et -12 dBi à 150 MHz.With reference to the Figure 5 it is found that the gain obtained on one of the dipoles is greater than -8 dBi over the frequency range 200 MHz - 500 MHz, greater than -5 dBi over the frequency range 230 MHz - 470 MHz. In addition, this gain is -35 dBi at 30 MHz, -17 dBi at 100 MHz, and -12 dBi at 150 MHz.

Enfin, en regard de la Figure 6, l'antenne 2 présente une couverture radioélectrique quasi-unidirectionnelle sur sa bande de fréquences.Finally, with regard to the Figure 6 , the antenna 2 has a quasi-unidirectional radio coverage on its frequency band.

En référence à la Figure 7, dans un deuxième mode de réalisation de l'invention, les moyens 10 d'adaptation d'impédance et d'alimentation sont intégrés à un circuit d'adaptation d'impédance 44, à l'exception des contacts électriques 28 raccordant les dipôles 16A, 16B audit circuit d'adaptation d'impédance 44 et des connecteurs 24.With reference to the Figure 7 in a second embodiment of the invention, the impedance matching and supply matching means 10 are integrated in an impedance matching circuit 44, with the exception of the electrical contacts 28 connecting the dipoles 16A. , 16B to said impedance matching circuit 44 and connectors 24.

Ce circuit 44 est réalisé en technologie imprimée connue de l'homme du métier et est alors disposé dans une semelle 46 que comprend la platine métallique 8.This circuit 44 is made in printed technology known to those skilled in the art and is then disposed in a sole 46 that includes the metal plate 8.

En pratique, la semelle 46 comprend une cavité 461 dédiée à cet effet et qui est accessible via un capot métallique amovible 462.In practice, the sole 46 comprises a cavity 461 dedicated for this purpose and which is accessible via a removable metal cover 462.

La platine métallique 8 délimite alors quatre orifices de passage 48 de forme cylindrique, situés en regard de l'orifice de passage 19 de la structure absorbante 6.The metal plate 8 then defines four cylindrical passage holes 48 located opposite the passage opening 19 of the absorbent structure 6.

Les orifices de passage 48 sont espacés angulairement de 90° les uns des autres et sont chacun destinés au passage d'un contact électrique 28.The passage openings 48 are angularly spaced 90 ° from each other and are each intended for the passage of an electrical contact 28.

Les contacts électriques 28 sont alors disposés dans les orifices de passage 19, 48 de façon à raccorder les dipôles 16A, 16B et le circuit 44.The electrical contacts 28 are then arranged in the passage orifices 19, 48 so as to connect the dipoles 16A, 16B and the circuit 44.

La semelle 46 présente une forme générale cylindrique d'axe A-A' et de diamètre inférieur ou égal au diamètre de la platine métallique 8 et comprend une surface inférieure 50.The sole 46 has a generally cylindrical shape of axis A-A 'and of diameter less than or equal to the diameter of the metal plate 8 and comprises a lower surface 50.

Les connecteurs 24 sont alors fixés au circuit d'adaptation d'impédance 44 dans la semelle 46 de façon à saillir de la surface inférieure 50, comme illustré sur la Figure 7.The connectors 24 are then attached to the impedance matching circuit 44 in the sole 46 so as to project from the lower surface 50, as illustrated in FIG. Figure 7 .

Les contacts électriques 31 assurent la continuité électrique entre la masse 36 de chaque connecteur 24 et le capot métallique amovible 462.The electrical contacts 31 provide electrical continuity between the ground 36 of each connector 24 and the removable metal cover 462.

En référence à la Figure 8, l'antenne 2 comprend également un radôme 52 propre à protéger ladite antenne 2 et à autoriser le passage des rayonnements électromagnétiques émis et reçus par l'antenne 2.With reference to the Figure 8 the antenna 2 also comprises a radome 52 able to protect said antenna 2 and to allow the passage of the electromagnetic radiation emitted and received by the antenna 2.

A cet effet, le radôme 52 présente une forme générale cylindrique et est réalisé à partir d'un matériau connu de l'homme du métier, de type verre époxy, polyamide, ou encore peek, etc.For this purpose, the radome 52 has a generally cylindrical shape and is made from a material known to those skilled in the art, such as epoxy glass, polyamide, or peek, etc.

Le radôme 52 est délimité radialement par une paroi latérale 54 présentant une épaisseur inférieure ou égale à la largeur l de la saillie 20 et verticalement par une paroi transverse 56 de forme discoïdale.The radome 52 is delimited radially by a lateral wall 54 having a thickness less than or equal to the width l of the projection 20 and vertically by a transverse wall 56 of disc shape.

Le radôme 52 est ainsi propre à être fixé sur la saillie 20 dans une position de protection illustrée sur la Figure 8 et dans laquelle son axe est confondu avec l'axe A-A'.The radome 52 is thus adapted to be fixed on the projection 20 in a protective position illustrated on the Figure 8 and in which its axis coincides with the axis A-A '.

Le radôme 52 délimite une cavité cylindrique 58 de dimensions complémentaires aux dimensions du cylindre dans lequel sont compris les dipôles 16A, 16B et la structure absorbante 6.The radome 52 delimits a cylindrical cavity 58 of dimensions complementary to the dimensions of the cylinder in which are included the dipoles 16A, 16B and the absorbent structure 6.

En pratique, les dimensions de la cavité 58 sont majorées par des distances ε et ε' allant de l'ordre du millimètre à quelques millimètres, et correspondant à un jour existant respectivement entre les dipôles 16A, 16B et la paroi transverse 56 et entre la structure absorbante 6 et la paroi latérale 54 du radôme 52 dans la position de protection de celui-ci.In practice, the dimensions of the cavity 58 are increased by distances ε and ε 'ranging from a millimeter to a few millimeters, and corresponding to a day respectively existing between the dipoles 16A, 16B and the transverse wall 56 and between the absorbent structure 6 and the side wall 54 of the radome 52 in the protective position thereof.

Dans l'exemple de la Figure 8, cette cavité 58 présente donc un diamètre de 330+2.ε' mm environ et une hauteur de 22+ε mm environ.In the example of the Figure 8 this cavity 58 thus has a diameter of 330 + 2. approximately ε 'mm and a height of approximately 22 + ε mm.

Toujours dans l'exemple de la Figure 8 qui illustre l'antenne 2 selon le deuxième mode de réalisation, la paroi latérale 54 est fixée sur la saillie 20 par des moyens de fixation (non représentés) de sorte que les dipôles 16A, 16B et la structure absorbante 6 sont intégralement compris dans la cavité 58, comme illustré sur la Figure 8.Still in the example of the Figure 8 which illustrates the antenna 2 according to the second embodiment, the side wall 54 is fixed on the projection 20 by fixing means (not shown) so that the dipoles 16A, 16B and the absorbent structure 6 are fully included in the cavity 58, as illustrated on the Figure 8 .

Comme illustrée sur la Figure 8, l'antenne 2 munie de son radôme 52 est comprise dans un cylindre d'axe A-A' et de diamètre sensiblement égal à 350 mm.As illustrated on the Figure 8 , the antenna 2 provided with its radome 52 is included in a cylinder axis AA 'and of diameter substantially equal to 350 mm.

En référence à la Figure 9, l'antenne 2 munie de son radôme 52 est propre à être agencée sur une surface plane 60 d'une cavité cylindrique 62 ménagée à cet effet dans un engin 64, la platine métallique 8 étant au contact de ladite surface 60.With reference to the Figure 9 , the antenna 2 provided with its radome 52 is adapted to be arranged on a flat surface 60 of a cylindrical cavity 62 provided for this purpose in a machine 64, the metal plate 8 being in contact with said surface 60.

Dans l'exemple de la Figure 9, qui représente une antenne 2 selon le deuxième mode de réalisation de l'invention, c'est alors la surface inférieure 50 de la semelle 46 de la platine métallique 8 qui est au contact de la surface plane 60.In the example of the Figure 9 , which represents an antenna 2 according to the second embodiment of the invention, it is then the lower surface 50 of the sole 46 of the metal plate 8 which is in contact with the flat surface 60.

La cavité cylindrique 62 présente un diamètre sensiblement égal au diamètre de l'antenne 2 et une hauteur sensiblement égale à la hauteur du radôme 52 à laquelle est ajoutée la hauteur de la platine métallique 8.The cylindrical cavity 62 has a diameter substantially equal to the diameter of the antenna 2 and a height substantially equal to the height of the radome 52 to which is added the height of the metal plate 8.

De préférence, ladite surface 60 et ladite cavité cylindrique 62 sont réalisées à partir d'un matériau métallique.Preferably, said surface 60 and said cylindrical cavity 62 are made from a metallic material.

Dans la surface 60 est ménagée une ouverture 66 pour le raccord via les connecteurs 24 des moyens 10 d'adaptation d'impédance et d'alimentation au dispositif d'émission/réception (non représenté) de l'antenne 2 qui lui est associé.In the surface 60 is provided an opening 66 for the connection via the connectors 24 of the impedance matching means and power supply to the transmitting / receiving device (not shown) of the antenna 2 associated therewith.

Claims (13)

  1. An antenna (2) for emitting/receiving electromagnetic waves, of the type comprising:
    - two dipoles (16A, 16B) orthogonal to each other, each dipole (16A, 16B) comprising two radiating elements (4),
    - a metal plate (8), and
    - an absorptive structure (6),
    characterized in that the metal plate (8) provides the functions of a ground plane as well as of a mechanical and electrical interface between the antenna (2) and the structure on which the antenna (2) is intended to be integrated, and in that the radiating elements (4) are all substantially planar, both dipoles (16A, 16B) being substantially comprised in a same plane (P) and in that the absorptive structure (6) is interposed between the metal plate (8) and the dipoles (16A, 16B) and is laid out in contact with the metal plate (8), the absorptive structure (6) being delimited vertically by a substantially planar upper surface and a lower surface, both parallel to the plane (P), said plane (P) being located at a distance from said upper surface, the lower surface being positioned in contact with the metal plate, the dipoles being powered by means capable of ensuring impedance matching, as well as symmetrizing the currents flowing in the radiating elements.
  2. The antenna (2) according to claim 1, characterized in that each radiating element (4) has a general disc sector shape.
  3. The antenna (2) according to claim 1 or 2, characterized in that said plane (P) is at a distance d from the absorptive structure (6), comprised between 1 mm and 2 mm.
  4. The antenna (2) according to any of the preceding claims, characterized in that it comprises an impedance matching circuit (44) made in printed technology.
  5. The antenna (2) according to claim 4, characterized in that the metal plate (8) comprises a sole (46), the impedance matching circuit (44) being laid out in said sole (46).
  6. The antenna (2) according to any of the preceding claims, characterized in that it also comprises a protective radome (52).
  7. The antenna (2) according to any of the preceding claims, characterized in that the absorptive structure (6) has a general cylindrical shape.
  8. The antenna according to claim 7, characterized in that the height of the absorptive structure (6) is comprised between 20 mm and 21 mm, and advantageously has the value of 20 mm, and its diameter is comprised between 330 mm and 334 mm, and advantageously has the value of 330 mm.
  9. The antenna (2) according to any of the preceding claims, characterized in that the dipoles (16A, 16B) and the absorptive structure (6) are entirely comprised in a cylinder with a diameter substantially equal to 330 mm and with a height substantially equal to 22 mm.
  10. The antenna (2) according to any of the preceding claims, characterized in that the electromagnetic waves which it is capable of emitting and receiving, have frequencies comprised in the whole range of frequencies 30 MHz - 500 MHz, and advantageously in the whole range of frequencies 30 MHz - 700 MHz.
  11. The antenna (2) according to any of the preceding claims, characterized in that it is able to emit and receive electromagnetic waves having any polarization from among a linear polarization, a circular polarization or an elliptical polarization, each dipole (16A, 16B) being capable of emitting/receiving electromagnetic waves having a horizontal linear polarization for one of the dipoles (16B) and a vertical linear polarization for the other dipole (16A) respectively.
  12. An land, airborne, or naval vehicle (64) of the type including:
    - a planar surface (60) and/or a cavity (62),
    - an antenna (2) according to any of the preceding claims and laid out on said surface (60) and/or in said cavity (62).
  13. The vehicle (64) according to claim 12, characterized in that the planar surface (60) and/or the cavity (62) are made from a metal material.
EP12199486.7A 2011-12-27 2012-12-27 Very-thin broadband compact antenna with dual orthogonal linear polarisations operating in the V/UHF bands Active EP2610966B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1104121A FR2985098B1 (en) 2011-12-27 2011-12-27 WIDEBAND COMPACT BROADBAND ANTENNA WITH VERY LOW THICKNESS AND DOUBLE ORTHOGONAL LINEAR POLARIZATION OPERATING IN V / UHF BANDS

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EP2610966A1 EP2610966A1 (en) 2013-07-03
EP2610966B1 true EP2610966B1 (en) 2017-07-19

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AU (1) AU2013200058B2 (en)
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JP6461061B2 (en) * 2016-09-22 2019-01-30 株式会社ヨコオ Antenna device
CN108598676B (en) * 2018-04-11 2019-08-06 南京邮电大学 A kind of broad beam plane back reflection and two-way circular polarized antenna
CN108539438B (en) * 2018-05-24 2020-11-13 广东曼克维通信科技有限公司 UHF dual polarized antenna
US20230070351A1 (en) * 2018-07-18 2023-03-09 Rodradar Ltd. Dipole antenna for use in radar applications
GB2575660A (en) * 2018-07-18 2020-01-22 Caterpillar Sarl A dipole antenna for use in radar applications

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US4870426A (en) * 1988-08-22 1989-09-26 The Boeing Company Dual band antenna element
US7852280B2 (en) * 2004-03-03 2010-12-14 Bae Systems Information And Electronic Systems Integration Inc. Broadband structurally-embedded conformal antenna
JP4408128B2 (en) * 2007-03-15 2010-02-03 シャープ株式会社 Mobile terminal device

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Publication number Publication date
FR2985098A1 (en) 2013-06-28
AU2013200058A1 (en) 2013-07-11
FR2985098B1 (en) 2014-01-24
CA2800952A1 (en) 2013-06-27
AU2013200058B2 (en) 2016-09-08
CA2800952C (en) 2020-02-25
EP2610966A1 (en) 2013-07-03

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