EP2548261B1 - Antenne réseau réflecteur à compensation de polarisation croisée et procédé de réalisation d'une telle antenne - Google Patents

Antenne réseau réflecteur à compensation de polarisation croisée et procédé de réalisation d'une telle antenne Download PDF

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EP2548261B1
EP2548261B1 EP11702668.2A EP11702668A EP2548261B1 EP 2548261 B1 EP2548261 B1 EP 2548261B1 EP 11702668 A EP11702668 A EP 11702668A EP 2548261 B1 EP2548261 B1 EP 2548261B1
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Prior art keywords
radiating element
plane
reflector array
radiating
directions
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EP11702668.2A
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German (de)
English (en)
French (fr)
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EP2548261A2 (fr
Inventor
Danièle Bresciani
Hervé Legay
Gérard Caille
Eric Labiole
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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
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/44—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
    • H01Q3/46—Active lenses or reflecting arrays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/006—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
    • H01Q15/12—Refracting or diffracting devices, e.g. lens, prism functioning also as polarisation filter
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/24—Polarising devices; Polarisation filters 
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49016—Antenna or wave energy "plumbing" making

Definitions

  • the present invention relates to a reflective array antenna with cross-polarization compensation and to a method for producing such an antenna. It applies in particular to antennas mounted on a spacecraft such as a telecommunications satellite or to antennas of terrestrial terminals for telecommunications or satellite broadcasting systems.
  • the offset antenna configurations comprising a reflector with a geometrically formed surface (in English: offset shaped reflector antenna) and a primary source offset with respect to the axis normal to the reflector, generate radiation in a cross polarization induced by the geometric curvature of the reflector and the level of which depends directly on the focal ratio of the reflector, the focal ratio being defined by the ratio between the focal length and the diameter of the reflector.
  • the larger the focal ratio the lower the level of cross polarization.
  • the structure of the antenna must be compact and the focal ratios are low, which induces a high level of cross polarization.
  • the level of cross polarization is zero in the direction normal to the antenna but there may be axisymmetric cross polarization lobes due to the curvature of the lines of fields at the ends of the reflector.
  • the primary source used can, when it has poor performance, itself generate field components comprising a cross polarization.
  • the antennas mounted on the satellites and pointing towards the Earth often have a double reflector structure mounted in a Gregorian configuration.
  • the use of two reflectors makes it possible to define the geometry of the auxiliary reflector relative to the geometry of the main reflector so that the cross polarization induced by the curvature of the auxiliary reflector cancels the cross polarization induced by the curvature of the main reflector.
  • the presence of the auxiliary reflector and its support structure results in an increase in the mass, volume and cost of the antenna compared to an antenna with a single reflector.
  • a reflector array antenna in English: reflectarray antenna
  • a primary source illuminates a reflective network under an oblique incidence.
  • the reflector comprises a set of elementary radiating elements assembled in a one or two-dimensional network and forming a reflecting surface which may be planar.
  • the reflective network then acts as a mirror and the radiation reflected by the reflective network does not have a cross polarization component s '' it is illuminated by a primary source without crossed polarization placed in its axis of symmetry.
  • the radiating elements of a reflecting array generally have geometric differences so as to precisely control the phase shift that each radiating element produces on an incident wave.
  • the arrangement of the elementary radiating elements with respect to each other on the surface of the reflector is generally synthesized and optimized so as to obtain a given radiation diagram in a chosen pointing direction with a chosen phase law. Consequently, it has been observed that although the reflector is flat and therefore there is no cross-polarization induced by the curvature of the reflector, due to the illumination of the reflector by a source in offset configuration, the reflector array behaves in operation as a reflector with a geometrically formed surface which also induces cross-polarized radiation whose level is of the same order of magnitude as a reflector with equivalent formed surface.
  • a reflective array antenna is disclosed in US 6,081,234 .
  • the object of the invention is to provide a reflective array antenna having a given phase diagram and in which the cross polarization generated by a primary source is canceled.
  • the invention relates to a reflective array antenna with cross-polarization compensation comprising a reflective array consisting of a plurality of elementary radiating elements regularly distributed and forming a reflecting surface and a primary source intended to illuminate the reflecting network, the reflecting network having a radiation diagram according to two main orthogonal polarizations in a direction of propagation chosen with a law of selected phase, each elementary radiating element being produced in planar technology and comprising an engraved pattern consisting of at least one metal patch comprising, in a symmetrical configuration having a square geometric shape, at least four opposite sides two by two with respect to a center of the engraved pattern and arranged parallel to two directions X, Y of the XY plane of the radiating element, characterized in that at least one radiating element of the reflecting network comprises a metallic patch having a geometric shape asymmetrical with respect to at least the one of the directions X and / or Y of the XY plane of the radiating element, the angular asymmetries consisting of an angular inclination
  • the asymmetry of the etched pattern is calculated individually for each radiating element from a symmetrical radiating element of the same pattern and consists of an angular inclination of at least one direction of the pattern.
  • the angular value of the angle of inclination is determined so that the radiating element generates a reflected wave having a controlled depolarization which opposes a depolarization generated in the plane normal to the direction of propagation by the reflective network illuminated by the primary source.
  • the controlled depolarization of the radiating element corresponds to an individual reflection matrix having main reflection coefficients of amplitude similar to those of the radiating element of the same pattern and of geometrically symmetrical shape in both directions X and Y, and cross reflection coefficients of non-zero amplitude greater than that of said radiating element of the same symmetrical pattern.
  • the engraved pattern comprises at least one radiating slot comprising in a symmetrical configuration of the radiating element, at least two branches diametrically opposite with respect to the center of the engraved pattern and arranged parallel to at least one of the directions X and / or Y of the radiating element, the asymmetry of the etched pattern of the radiating element also consists of an angular inclination of each branch, with respect to the X and / or Y directions of the plane of the radiating element.
  • the slots in the case of an engraved pattern comprising a metal patch and at least two slots engraved in the metal patch, the slots forming at least four main branches oriented respectively, two by two, parallel to the directions X and Y in a symmetrical configuration of the radiating element, the angular asymmetries also consist of angular rotations of the four main branches of the slots, around the center of the engraved pattern, in the XY plane.
  • the etched pattern of asymmetrical shape includes a metal patch and slots etched in the metal patch, the slots forming a central cross having four main branches opposite in pairs, the main branches located in opposite directions relative to the center of the pattern. engraved, being inclined in opposite directions.
  • several adjacent radiating elements of the reflecting array comprise an engraved pattern having an asymmetrical geometric shape with respect to at least one direction X and / or Y of the XY plane of each of said radiating elements, the angular inclinations on the side or the branch of the geometric shape of the engraved pattern of each of said radiating elements forming an angle of continuously progressive value from one radiating element to another radiating element adjacent to the reflecting surface.
  • the reflective grating comprises several planar facets oriented according to different planes, each facet plane comprising a plurality of elementary radiating elements, and in that at least one radiating element of each plane facet of the reflecting network comprises an engraved pattern having an asymmetrical geometric shape with respect to at least one direction X and / or Y of the plane XY of the facet to which the corresponding radiating element belongs.
  • the invention also relates to a method for producing a reflective array antenna with cross-polarization compensation consisting in producing a reflective array (11) consisting of a plurality of elementary radiating elements (20) regularly distributed and forming a reflecting surface and to illuminate the reflective network (11) by a primary source (13), characterized in that it consists in developing a reflective network in which each elementary radiating element is produced in planar technology and comprises an engraved pattern consisting of at least one metal patch (15) comprising, in a symmetrical configuration having a square geometric shape , at least four opposite sides two by two with respect to a center (50) of the engraved pattern and arranged parallel to two directions X and Y of the XY plane of the radiating element, at least one radiating element (20) of the reflective network (11) comprising a metal patch ic having an asymmetrical geometric shape with respect to at least one of the X and / or Y directions of the XY plane of the radiating element, the angular asymmetries consist of an angular inclination
  • a reflector array antenna 10 as shown for example on the figure 1 , comprises a set of elementary radiating elements 20 assembled in reflective network 11 in one or two dimensions and forming a reflective surface 14 making it possible to increase the directivity and the gain of the antenna 10.
  • the reflective network 11 is illuminated by a source primary 13.
  • the elementary radiating elements 20, also called elementary cells, of the reflective network 11, include etched patterns of the metal patch and / or slot type.
  • the engraved patterns have variable parameters, such as for example the geometric dimensions of the engraved patterns (length and width of the “patches” or slots), which are adjusted from so as to obtain a chosen radiation pattern.
  • the elementary radiating elements 20 can be constituted by metallic patches charged with radiating slots and separated from a metallic ground plane by a typical distance between ⁇ g / 10 and ⁇ g / 4, where ⁇ g is the guided wavelength in the spacer medium.
  • This spacer medium can be a dielectric, but also a composite sandwich produced by a symmetrical arrangement of a separator of the honeycomb type and of dielectric skins of thin thicknesses.
  • the elementary radiating element 20 is of square shape having sides of length m, comprising a metal patch 15 printed on an upper face of a dielectric substrate 16 provided with a metal ground plane 17 on its lower face.
  • the metal patch 15 has the shape of a square having sides of dimension p and has two slots 18 of length b and width k formed in its center, the slots being arranged in the shape of a cross.
  • the plane of the reflecting surface of the radiating element is the XY plane.
  • the shape of the elementary radiating elements 20 is not limited to a square, it can also be rectangular, triangular, circular, hexagonal, cross-shaped, or any other geometric shape.
  • the slots can also be made in a number different from two and their arrangement can be different from a cross.
  • the radiating element could also include a pattern consisting of a central patch in the shape of a cross and one or more peripheral slots.
  • the radiating element could comprise a pattern consisting of several concentric annular metal patches and of several annular or non-annular slots.
  • the elementary cell must be able to precisely control the phase shift that it produces on an incident wave, for the different frequencies of the passband.
  • the arrangement (in English: lay-out) of the elementary radiating elements with respect to each other to form a reflective network is synthesized so as to obtain a given radiation diagram in a chosen pointing direction and with a predetermined phase law .
  • the figure 3 shows an example of arrangement of elements radiating from a reflective array antenna, making it possible to obtain a directional beam pointed in a lateral direction with respect to the antenna. Due to the flatness of the reflective network and the differences in path lengths of a wave emitted by a primary source 13 to each radiating element 7, 8 of the network, the illumination of the reflective network by an incident wave coming from the primary source 13 causes a phase distribution of the electromagnetic field above the reflecting surface 14.
  • the etched patterns of each radiating element 7, 8 therefore have geometric dimensions defined so that the incident wave is reflected by the network 11 with a phase shift which compensates for the relative phase of the incident wave.
  • each radiating element is usually chosen to be symmetrical with respect to the two orthogonal axes X and Y of the plane of each radiating element.
  • An isolated symmetrical radiating element hardly depolarizes an incident wave normal to its plane and the associated reflection matrix therefore has very low crossed reflection coefficients, generally less than 30 dB. These levels can increase for an oblique incidence, particularly greater than 40 ° compared to normal.
  • the radiating elements are arranged on the surface of the reflector so as to achieve a specific phase law over the entire surface, in a main polarization corresponding to the polarization emitted by the primary source. Depolarization phenomena are phenomena considered as parasites which deteriorate the performance of the antenna, but they are generally not taken into account when the arrangement of the reflector array is carried out.
  • the reflective grating 11 When the reflective grating 11 is illuminated by an oblique incident wave in a linear polarization, it generates a reflected wave comprising two field components in two orthogonal directions X and Y.
  • the surface of the reflecting array 11 is partially shown diagrammatically by dotted lines and four radiating elements 20 are shown, each radiating element 20 comprising a metallic patch of square shape.
  • the incident electromagnetic field Einc emitted by the primary source can be linearly polarized, for example in a vertical direction in an orthonormal reference frame linked to the source.
  • the incident field Einc Due to its oblique incidence, the incident field Einc, linearly polarized in the plane linked to the source, induces, in an XY coordinate system linked to the plane of the radiating element, an incident field Ei comprising two field components Eix and Eiy according to the two directions X and Y of the plane of the radiating element, the two components Eix and Eiy corresponding to the projection of the oblique incident field Einc in the plane of the reflecting network.
  • the reflective grating then radiates, in a main propagation direction, a reflected electromagnetic field Er comprising two field components Erx and Ery.
  • the incident field Einc linearly polarized in the reference frame linked to the primary source 13 therefore generates in a plane XY parallel to the plane of the reflective grating 11, a field component in cross polarization.
  • the crossed polarization components induced at the level of the radiating elements compensate each other.
  • the direction normal n to the plane of the reflective grating is generally different from the normal plane 44 to the direction of propagation 45.
  • the crossed polarization components are then summed with a weighting in phase and no longer compensate for each other.
  • the invention therefore consists in synthesizing a reflective grating in accordance with the prior art, that is to say by being concerned only with the radiation patterns required in the two main orthogonal polarizations and therefore by only looking at main reflection coefficients Rxx and Ryy.
  • main reflection coefficients Rxx and Ryy have amplitudes close to 1.
  • the invention then consists in slightly disturbing the polarization induced by at least one radiating element of the grating reflector so as to compensate for the cross-polarization components induced by the reflective grating.
  • the disturbance to be introduced into the radiating elements is determined individually, for each of the radiating elements of the reflecting network.
  • the slight depolarization of the waves reflected by each radiating element corresponds to the appearance, in the plane of the reflecting network, of radiation in crossed polarization, at low amplitude, at the level of the individual radiating elements.
  • the slight depolarization is such that it makes it possible to obtain, in the normal plane 44 to the direction of propagation 45 of the waves reflected by the reflecting network 11, called the opening plane of the reflecting network or the radiating opening plane, a distribution electric field without cross component.
  • the depolarization introduced must be low and not disturb the fundamental mode of radiation of the radiating element, nor its phase.
  • the cross reflection coefficients introduced by each elementary radiating element will preferably be less than -15dB.
  • the invention consists, in a first step, in defining the radiation pattern of the far electromagnetic field 46 desired and in imposing as a starting condition, that the polarization components are null for this far field.
  • this far electromagnetic field 46 is associated a unique distribution of a near electromagnetic field over an infinite radiating aperture defined by a normal plane 44 to the direction of propagation 45 of the waves reflected by the reflective network 11.
  • the crossed polarization components being zero in the far field, they are also zero in a plane normal to the direction of propagation of the waves reflected by the reflective network and are therefore zero in the opening plane 44 of the reflective network 11. From the field radiation diagram electromagnetic far 46 desired, it is possible to deduce therefrom, by means of a Fourier transform, the main polarization components of the corresponding radiated near field, in the opening plane 44 of the reflecting array,
  • the invention in a second step, in the general case where the opening plane 44 is different from the plane of the reflective grating 11, the invention then consists in calculating, by a backpropagation technique, for each radiating element of the reflective grating, the components of the corresponding radiated electric field in the plane of the reflecting network.
  • the backpropagation technique consists in changing the reference point of the opening plane 44 to the plane of the reflective network 11.
  • the components of the electric field radiated in the plane of the reflective network are the components Erx and Ery reflected by the corresponding radiating element according to the respective directions X and Y.
  • the Ery component is weak but not zero if the plane of the reflective grating is different from the opening plane.
  • the invention consists in calculating the components of the incident electric field Eix and Eiy induced by the primary source 13 on each radiating element of the reflective network.
  • the cornet is defined by a set of modal coefficients of spherical waves with which it is possible to calculate the near or far radiated field as described for example in the book of G. Franceschetti, "Campi Elettromagnetici", Bollati Boringhieri editore srl, Torino 1988 (II ediée ), incorporated by reference.
  • the invention consists, for each radiating element, in deducing therefrom the main reflection coefficients Rxx and Ryy and the corresponding reflection coefficients Rxy and Ryx.
  • the oblique incident wave Einc is polarized in two main orthogonal directions X and Y
  • the components of the reflected field generated in the directions X and Y are connected to the incident field by two equations for polarization in the direction X and two additional equations for polarization in the Y direction.
  • the reflection matrix of each radiating element of the reflecting network therefore comprises reflection coefficients Rxx in the direction X, Ryy in the direction Y and two crossed reflection coefficients Rxy and Ryx corresponding to a crossed polarization.
  • the invention firstly consists in synthesizing a reflective grating by only being concerned with the radiation patterns required in the two main orthogonal polarizations in the directions X and Y and therefore by only being interested in to the main reflection coefficients Rxx and Ryy, then to slightly disturb the polarization of at least one radiating element so as to compensate for the cross polarization induced by the reflective network in the direction of propagation of the reflected waves.
  • the angle of incidence of the emitted wave relative to this radiating element varies and the crossed reflection coefficients also vary.
  • the depolarization is all the more important as the angle ⁇ of the incident wave with respect to the normal direction n to the reflective grating increases.
  • the components Erx and Ery of the radiated field Er must be determined for each radiating element, in the plane XY of the facet to which this radiating element belongs.
  • Different XY references are therefore to be considered depending on the radiating element considered and the facet in which it is located.
  • the method for estimating the amount of depolarization necessary to achieve on each individual radiating element must therefore be applied facet by facet so as to reconstruct, according to the method presented above, the components Erx and Ery of the radiated field in the XY plane. corresponding to the radiating element considered.
  • a reflective network synthesized, in accordance with the prior art, by being only interested in the main reflection coefficients Rxx and Ryy, generally comprises, for reasons of simplicity of construction, radiating elements having an etched pattern symmetrical along their axes principal in the orthogonal directions X and Y of the plane of the reflecting network. In the case where the same radiations are required for the two orthogonal polarizations, the radiating elements have moreover identical dimensions in the directions X and Y.
  • the invention then consists in introducing, into the individual radiating elements 20 of the reflecting network 11, a controlled depolarization, different from 'a radiating element to another radiating element, making it possible to obtain the totality of the reflection coefficients corresponding to the desired values.
  • This depolarization introduced individually into the radiating elements is such that it then compensates for the depolarization induced by an oblique incident wave on the final reflective network.
  • the figure 5a illustrates the distribution of the electric field in the plane of the radiating aperture in the case where the reflective grating has been synthesized without taking account of the parasitic phenomena linked to cross polarization and where the radiation comprises a component in cross polarization
  • the figure 5b illustrates the case where the reflective grating has been synthesized so as to cancel the cross-polarization component and where the radiation is perfectly polarized without cross-component.
  • the depolarization introduced into at least one individual radiating element of the reflecting network consists in breaking the symmetry of the pattern of this radiating element while retaining the same phase of the main reflection coefficients induced by this radiating element, so as not to disrupt its radiation in the main polarization.
  • One thus acts on the amplitude and the phase of the crossed reflection coefficients.
  • angular asymmetries are introduced into the patterns of the radiating elements which generate cross polarization, certain radiating elements not generating cross polarization, for example those located in the axis of symmetry of the reflective network, which can remain symmetrical.
  • These angular asymmetries consist of angular inclinations of at least one main direction of the pattern or angular rotations of the four main directions X, X ', Y, Y' of the patterns, around the center 50 of the pattern, in the XY plane.
  • the angular rotations are carried out with angles which can be different or identical for all the directions and in directions which can be identical or different.
  • the asymmetry of the pattern of each of said radiating elements is continuously progressive one radiating element to another adjacent radiating element on the reflecting surface.
  • a first example represented on the figures 6a to 6d relates to the case of a radiating element 20 whose geometric pattern comprises a metal patch and slots engraved in the patch.
  • the slots form a symmetrical central cross in two orthogonal directions XX 'and YY', called the Jerusalem cross.
  • the cross has four main branches 62, 63, 64, 65, opposite two by two, oriented respectively in the directions X, X ', Y, Y', each main branch having one end provided with a perpendicular extension.
  • the reflection matrix 60 of this symmetrical radiating element is such that the coefficients of main reflections are of equal amplitudes and close to the maximum value 1, corresponding to 0dB, and the crossed reflection coefficients have very small amplitudes, typically of the order of -29dB.
  • the desired reflection matrix 61 comprises main reflection coefficients very little modified compared to those of the symmetrical element and slightly degraded crossed reflection coefficients, having an amplitude of the order of -21 dB, this degraded amplitude being however always located at a level corresponding to noise.
  • each main branch of the central cross has undergone different types of angular rotation relative to the center 50 of the radiating element.
  • the angular rotations consist in modifying the inclination of each of the main branches, independently of each other, from a different angle and in a positive or negative direction.
  • the main branches of the cross located in diametrically opposite directions XX ′, YY ′ have been inclined simultaneously, by the same angle, the inclination being in a positive direction for two opposite branches and in a negative direction for the other two branches.
  • the amplitude and phase diagrams of the corresponding crossed reflection coefficients show that this configuration has a strong impact on the amplitude of the crossed reflection coefficients whereas their phase, modulo 180 °, does not change when the angle of inclination of the main branches of the cross varies between -10 ° and + 10 °.
  • the four main branches of the cross are inclined independently of each other by the same angle, the branches located in diametrically opposite directions being inclined in opposite directions but two successive branches being inclined in the same direction.
  • the amplitude and phase diagrams of the corresponding crossed reflection coefficients show that this configuration has little impact on the amplitude of the crossed reflection coefficients when the angle of inclination of the main branches of the cross varies between -4 °. and + 4 ° while their phase is changing a lot.
  • the two configurations 20f, 20g of the figure 6d , the four main branches of the cross are inclined independently of each other of the same angle, the branches situated in diametrically opposite directions being inclined in opposite directions as on the figure 6c but the direction of inclination of two opposite branches is reversed.
  • the amplitude and phase diagrams of the corresponding crossed reflection coefficients show that this configuration has a great impact on the amplitude of the crossed reflection coefficients when the angle of inclination of the main branches of the cross varies between -10 °. and + 10 ° while their phase does not change.
  • the figure 6e shows an example of an optimized radiating element 20i whose reflection matrix is very close to the desired matrix 61 indicated on the figure 6a .
  • This radiating element 20i comprises two branches forming an angle of 9.35 ° respectively in a negative direction of rotation and in a positive direction of rotation relative to the directions Y and X, and two branches forming an angle of 6.65 ° respectively in a negative direction of rotation and in a positive direction of rotation with respect to the directions X 'and Y'.
  • the figure 7 relates to a set of successive symmetrical radiating elements comprising a continuously evolving phase between two consecutive radiating elements, each radiating element 20 comprising a pattern made up of a metallic patch of square shape and of a radiating opening made in the metallic patch.
  • the respective dimensions of the metal patch with respect to the radiating opening are continuously evolving from one radiating element to another adjacent radiating element, which makes it possible to have a large number of different phases between 0 ° and 360 °, modulo 360 °. to be distributed over a reflecting network as a function of the desired radiated phase law.
  • the different successive phases are obtained without abrupt rupture of the dimensions of the patch relative to the radiating opening thanks to the appearance of the radiating opening in the center of the metallic patch and to the progressive increase in the dimensions of the radiating opening up to on the disappearance of said metallic patch then on the appearance in the center of the radiant opening of a new patch metallic whose dimensions gradually increase until the radiant opening disappears.
  • the figures 8a and 8b show the phase and amplitude diagrams of the crossed reflection coefficients for a radiating element subjected to an oblique incident wave and comprising two inclined sides 81, 82 or 83, 84 in opposite directions so as to form a trapezoid, the angle of inclination of the sides varying between -10 ° and + 10 ° relative to the direction YY 'for the figure 8a or with respect to direction XX 'for the figure 8b .
  • the amplitude of the crossed reflection coefficients varies very little while the phase changes a lot.
  • FIGS. 10a and 10b show other diagrams of evolution of the phase and of the amplitude of the crossed reflection coefficients when two opposite sides are inclined by the same angle in the same direction so as to obtain a parallelogram.

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  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
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  • Aerials With Secondary Devices (AREA)
EP11702668.2A 2010-03-19 2011-02-11 Antenne réseau réflecteur à compensation de polarisation croisée et procédé de réalisation d'une telle antenne Active EP2548261B1 (fr)

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Application Number Priority Date Filing Date Title
FR1001100A FR2957719B1 (fr) 2010-03-19 2010-03-19 Antenne reseau reflecteur a compensation de polarisation croisee et procede de realisation d'une telle antenne
PCT/EP2011/052048 WO2011113650A2 (fr) 2010-03-19 2011-02-11 Antenne réseau réflecteur à compensation de polarisation croisée et procédé de réalisation d'une telle antenne

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EP2548261A2 EP2548261A2 (fr) 2013-01-23
EP2548261B1 true EP2548261B1 (fr) 2020-03-25

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US (1) US9112281B2 (es)
EP (1) EP2548261B1 (es)
JP (1) JP6057380B2 (es)
KR (1) KR101780842B1 (es)
CA (1) CA2793126C (es)
ES (1) ES2795045T3 (es)
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ES2795045T3 (es) 2020-11-20
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FR2957719B1 (fr) 2013-05-10
US20130099990A1 (en) 2013-04-25
JP2013543283A (ja) 2013-11-28
FR2957719A1 (fr) 2011-09-23
CA2793126A1 (fr) 2011-09-22
WO2011113650A2 (fr) 2011-09-22
EP2548261A2 (fr) 2013-01-23
CA2793126C (fr) 2019-11-12
RU2012144440A (ru) 2014-04-27
JP6057380B2 (ja) 2017-01-11
US9112281B2 (en) 2015-08-18

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