EP3075031A2 - Agencement de structures antennaires pour télécommunications par satellites - Google Patents
Agencement de structures antennaires pour télécommunications par satellitesInfo
- Publication number
- EP3075031A2 EP3075031A2 EP14803174.3A EP14803174A EP3075031A2 EP 3075031 A2 EP3075031 A2 EP 3075031A2 EP 14803174 A EP14803174 A EP 14803174A EP 3075031 A2 EP3075031 A2 EP 3075031A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- arrangement
- symmetry
- structures
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/08—Helical antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/067—Two dimensional planar arrays using endfire radiating aerial units transverse to the plane of the array
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/20—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/20—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path
- H01Q21/205—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path providing an omnidirectional coverage
Definitions
- the present invention relates to an arrangement of antennal structures for telecommunications, a platform comprising the arrangement of antenna structures and a method of satellite communication between two stations using at least the arrangement of antenna structures.
- obtaining good quality communication involves particular performances for the electromagnetic waves produced by the antennal structure used in the communication in terms of gain and level of the sidelobes (relationship between the intensity of the side lobes and the intensity of the main lobe).
- a parabolic antenna structure comprising a source producing electromagnetic waves and a parabola arranged to focus the electromagnetic waves produced by the source.
- the source is positioned at a focal point of the parable.
- the dish In order to have the best performance with respect to the criteria mentioned previously in terms of gain and level of side lobes, the dish must have a diameter of at least 40 centimeters to avoid significant masking of the emitting source.
- the antennal structure may have a troublesome size in certain applications involving in particular the implantation of the antennal structure on an aerial platform, for example, on a helicopter.
- the use of an electronic scanning antenna structure may involve the use of an additional polarizer or coupled dual-feed structure, which may degrade slightly.
- the gain of the radiating structure including the structure antennal and the polarizer may be used.
- at least one engine is essential.
- each antenna structure comprises a transmitting-receiving surface comprising an axis of symmetry and at least one elementary antenna having a helical shape and sized to emit and / or receive at least one electromagnetic wave having a frequency greater than 4 GHz, preferably comprised between 4 GHz and 50 GHz, in particular included in a spectrum band chosen from the X band and the Ku band. At least two axes of symmetry are concurrent.
- the antenna array arrangement comprises one or more of the following features, taken singly or in any technically feasible combination:
- each transmitting-receiving surface of an antenna structure is at least contiguous with a transmitting-receiving surface of another antenna structure;
- the arrangement of antennal structures has an axis of symmetry, the axis of symmetry of each transmitting-receiving surface of each antenna structure of the arrangement forming an angle with the axis of symmetry of the arrangement of antenna structures ;
- the antenna structures are arranged in at least three groups of antenna structures comprising one or more antenna structures, the axis of symmetry of each of the transmission-reception surfaces of the antenna structures of the first group forming an angle of between 0 ° and 30 °; ° with the axis of symmetry of the array of antenna structures, the axis of symmetry of each of the transmitting-receiving surfaces of the antenna structures of the second group forming an angle between 30 ° and 60 ° with the axis of symmetry of the array of antenna structures and the axis of symmetry of each of the transmitting-receiving surfaces of the antenna structures of the third group forming an angle of between 30 ° and 90 ° ° with the axis of symmetry of the arrangement of antenna structures;
- each transmitting-receiving surface of an antenna structure is of generally circular shape, each elementary antenna of the antenna structure extending between a first end adjacent to the transmitting-receiving surface and a second end remote from the surface transmission-reception, each antennal structure also comprising two sets of a plurality of elementary antennas, the elementary antennas of each set being arranged along a circle of proper radius of this set, all said circles being concentric, the ratio between the radii of the two circles being preferably less than 25%;
- the area of the emission-reception surface of each antenna structure is less than or equal to 100 * ⁇ 2 where " * " denotes the mathematical operation of multiplication, and ⁇ denotes the average wavelength of the different lengths of d waves of electromagnetic waves that the elementary antennas of the antenna structure are sized to transmit and / or receive;
- the arrangement comprises a radome covering each transmitting-receiving surface
- each antenna structure further comprises a housing whose base surface is the transmission-reception surface, and the elementary antennas comprise an electric field insertion rod and an insulation dielectric device inserted between the rod and the housing the radome being adapted to be fixed to the housing and having a positioning cavity adapted to receive the dielectric device in an inserted position;
- the housing comprises a first inner wall parallel to the transmitting-receiving surface, the transmitting-receiving surface being between the first inner wall and the radome, the dielectric device being in abutment against the first inner wall when the radome is attached to the housing and the dielectric device is in its inserted position;
- the dielectric device comprises a cavity for receiving the rod
- the rod comprises a cylindrical cylindrical first straight portion
- the dielectric device comprises a first end portion and a cylindrical second end portion with a circular base
- the receiving cavity comprises an axial cavity adapted to receive the first portion; rectilinear, the first straight portion having a fourth diameter, the second end portion having a sixth diameter and the axial cavity having a second depth equal to half the sum of the fourth diameter and the sixth diameter;
- the dielectric device comprises a cylindrical crown with a circular base having a seventh diameter
- the emission-reception surface comprises a coaxial access orifice adapted to receive the dielectric device, the coaxial access orifice being cylindrical with a circular base and having a first diameter, the first diameter being greater than the seventh diameter;
- the antenna structures are made of a metallized plastic material.
- the invention also relates to a platform, including an aerial platform, comprising at least one antenna structure arrangement as described above.
- the subject of the present invention is also a telecommunication method, in particular by satellite, between two stations comprising a step of transmitting or receiving electromagnetic waves having a frequency greater than 4 GHz, preferably between 4 GHz and 50 GHz, in particular included in a band of spectrum selected from the X band and the Ku band, by an array of antenna structures as described above.
- FIGS. 1 to 3 diagrams of an antenna structure according to a first embodiment respectively in a top view, in perspective and in side view;
- FIG. 4 is a graph showing the evolution of the adaptation of the antenna structure of the first embodiment as a function of frequency (in the case of a structure adapted by the X-band satellite bands);
- FIGS. 6 to 8 diagrams of an antenna structure according to a second embodiment in perspective, in plan view and in side view;
- FIG. 9 a radiation pattern in gain of the antenna structure of the second embodiment
- FIGS. 12 and 13 are diagrams of an arrangement of antenna structures according to the invention in plan view and in side view, and
- FIG. 14 a graph showing the evolution of the gain as a function of the angle of emission considered for the arrangement of antenna structures.
- FIG. 10 An antenna structure 10 for telecommunications, in particular by satellite, is represented in FIG.
- the antenna structure 10 comprises an elementary antenna 12, a transceiver surface 14 and a radome 16.
- the elementary antenna 12 has a helical shape.
- the elementary antenna 12 has an emissive portion consisting of a wire that describes a spiral that wraps around an axis. In this case, this axis is normal to the transceiver surface 14.
- the projection of the spiral on the transceiver surface 14 is a circle whose diameter is denoted D. In a manner known per se, the diameter of the projection of the spiral, the number of turns of the spiral, the spacing between these turns make it possible to determine the frequency or frequencies that the elementary antenna 12 is suitable for transmitting or receiving.
- the elementary antenna 12 may be sized to transmit and / or receive an electromagnetic wave having a frequency greater than 4 GHz for applications in the context of satellite communications. This means that such an elemental antenna 12 has an extension along the Z direction less than 20 millimeters (mm) and a diameter less than 30 mm.
- the elementary antenna 12 is sized to emit and / or receive an electromagnetic wave having a frequency between 4 GHz and 50 GHz.
- This means that such an elementary antenna 12 has an extension along the Z direction of between 1.5 mm and 20 mm and a diameter of between 2 mm and 30 mm.
- the elementary antenna 12 is sized to emit and / or receive an electromagnetic wave having a frequency in a spectrum band selected from the X band and the Ku band.
- an electromagnetic wave in the satellite communications domain belongs to the X band when the wave has a frequency between 7.2 GHz and 8.4 GHz.
- an elementary antenna 12 is able to emit and / or receive an electromagnetic wave belonging to the X band if the elementary antenna 12 has an extension along the Z direction between 9 mm and 10 mm and a diameter between 14 mm and 15 mm.
- an electromagnetic wave in the field of satellite communications belongs to the Ku band when the wave has a frequency between 10.7 GHz and 14.25 GHz.
- an elementary antenna 12 is able to emit and / or receive an electromagnetic wave belonging to the Ku band if the elementary antenna 12 has an extension along the Z direction between 6 mm and 8 mm and a diameter between 10 mm and 12 mm.
- the elementary antenna 12 extends between a first end 18 fed by a coaxial access present on the transceiver surface 14 and a second end 20 remote from the transceiver surface 14.
- the first end 18 is adjacent at the transceiver surface 14.
- the elementary antenna 12 thus protrudes from the transceiver surface 14.
- the transceiver surface 14 is circular in shape.
- the transceiver surface 14 has an area A less than or equal to 100 * ⁇ 2 where " * " denotes the mathematical operation of multiplication, and ⁇ denotes the average wavelength of the different wavelengths of the waves that the elementary antennas 12 are sized to transmit and / or receive.
- the area A is less than 7600 mm 2 .
- the antenna structure 10 further comprises a cylindrical housing 22 whose base surface is the transceiver surface 14.
- the housing 22 delimits a supply cavity of the elementary antenna 12 in electromagnetic waves arranged with coaxial access orifices present on the transceiver surface 14.
- the housing 22 has an input 24 for injecting an electromagnetic wave, the electric field of the electromagnetic wave then propagating in the radial cavity.
- the elementary antenna 12 is provided with an insertion element of the electric field. This means that the elementary antenna 12 is devoid of an insertion loop of the magnetic field.
- the insertion element of the electric field is a metal rod that may or may not be in contact with the housing 22.
- a dielectric isolation device is inserted between the rod and housing 22 which maintains the straightness of the rod and incidentally the elemental antenna 12.
- this dielectric device has dielectric characteristics less than 4 to ensure optimal performance of the antennal structure.
- the radome 16 has a cylindrical shape whose base is the transceiver surface 14.
- the radome 16 has a diameter of less than 50 millimeters (mm).
- the radome 16 has an extension, along the Z direction, of less than 14 mm and is positioned at a distance greater than 1 mm from the elementary antennas 22.
- the antenna structure 10 may be of metallized plastic, in particular the housing 22 and the elementary antenna 22 are in such a material to limit its overall weight. But ideally, the material must be a conductive metal.
- the antenna structure 10 is powered by an electromagnetic wave.
- Elemental antenna 12 captures the electric field from this electromagnetic wave to emit a wave in the desired frequency band.
- Figure 4 shows that over the entire band of interest (in this case, it is the X band) the adaptation is less than -20 dB. This testifies to the good adaptation of the antenna in terms of impedance for operation in the X band.
- the antenna structure 10 has a gain of the order of 13 dB.
- the helical elementary source has a wide band, a band greater than 25% around the central operating frequency, circular polarization and very good radiation efficiency (in particular the axial ratio for such a small antenna is better than in the state of the art and apodization of the transmitted wave facilitated).
- the antenna structure 10 has better performance than a parabola of reduced size, a better compactness and a reduced weight (this effect being accentuated in the second embodiment presented hereinafter).
- This reduced weight makes it possible to reduce the stresses, especially in the case where the antenna structure 10 is accompanied by a mechanical positioner.
- the antenna structure 10 is capable of emitting a circular polarized wave without the use of an additional polarizer.
- FIG. 6 to 8 illustrate a second embodiment of the antenna structure 10 according to the invention.
- the elements identical to the first embodiment of FIG. 1 are not described again. Only the differences are highlighted.
- the antenna structure 10 comprises a plurality of elementary antennas 12.
- Each elementary antenna 12 of FIGS. 6 to 8 is identical to the elementary antenna 12 described with reference to FIG.
- the antenna structure 10 comprises at least two sets of a plurality of elementary antennas 12. According to the example of FIG. 6, the antenna structure 10 comprises two sets 30 and 32 of plurality of elementary antennas 12.
- the elementary antennas 12 of each set 30, 32 are arranged along a circle of clean radius of this set 30, 32, all said circles 30, 32 being concentric.
- the first assembly 30 comprises six elementary antennas 12 arranged along a first circle having a first radius R1 and the second assembly 32 comprises fourteen elementary antennas 12 arranged along a second circle. having a second radius R2.
- the two radii R1 and R2 are such that the first radius R1 is smaller than the second radius R2.
- the ratio between the two radii R1 and R2 is less than 25%.
- the elementary antennas 12 are provided with insertion elements of the electric field.
- the insertion elements of the electric field are in the form of metal rods. This means that the elementary antennas 12 are devoid of an insertion loop of the magnetic field.
- the antenna structure 10 further comprises a cylindrical housing 22 whose base surface is the transceiver surface 14.
- the rods supplying the elementary antennas 12 may or may not be in contact with the housing 22. In the case where there is no contact, an insulating dielectric device is inserted between the rod and the housing 22 which makes it possible to maintain the straightness of the stem and incidentally of the elementary antenna 12.
- the housing 22 defines a supply cavity of the elementary antennae 12 in electromagnetic waves arranged in contact with the transceiver surface 14.
- the radome 16 has a cylindrical shape whose base is the transceiver surface 14.
- the radome 16 has a diameter of less than 120 mm and a height less than
- the operation of the antenna structure 10 according to the second embodiment is similar to the operation of the antenna structure 10 according to the first embodiment.
- the antenna structure 10 has a gain of the order of 20 dB.
- the opening at -3 dB of the main lobe is of the order of 19 °.
- the realization of the antenna structure 10 is simplified since the supply cavity is not very complex.
- the antenna structure 10 has a wide band, greater than 10% around the central operating frequency and a very good radiation efficiency (better than 70%) with low losses.
- the optimization of the antenna structure 10 to improve the reduction of the secondary lobes is also easy to implement since these depend solely on the position and the orientation of the elementary antennas 12.
- the size of the antenna structure 10 is reduced, especially in the Z direction. This results in a better compactness of the antenna structure 10.
- the gain of the antenna structure 10 is easily controllable since the increase in the number of elementary antennas 12 causes an increase in the gain of the antenna structure 10.
- the antenna structure 10 has a smaller mass than the parabola of a parabolic antenna structure whose source is remote, especially if the material is metallized plastic.
- the antenna structure 10 is made of metallized plastic, this can lead to decreases in the manufacturing cost of the antenna structure 10.
- FIG. 10 illustrates a third embodiment of the antenna structure 10 according to the invention.
- the elements identical to the first embodiment of FIG. 1 are not described again. Only the differences are highlighted.
- the elementary antenna 12 comprises an insertion element of the electric field 100.
- the housing 22 has a first inner wall 102 and a second inner wall 104 which delimit in the Z direction the electromagnetic wave supply cavity.
- At least one coaxial access port 106 is provided in the transceiver surface 14.
- the radome 16 comprises a third inner wall 108 and a positioning cavity 1.
- the radome 16 is configured to be fixed to the housing 22.
- a dielectric device 1 12 is inserted between the rod and the housing 22.
- the dielectric device 1 12 is provided to maintain the straightness of the elementary antenna 12.
- the dielectric device 13 also makes it possible to prevent the contact between the elementary antenna 12 and the housing 22.
- the insertion element of the electric field 100 is a rod.
- the rod 100 is made of metal.
- the rod 100 is bent so that the rod 100 has two straight portions 1 14, 1 16 connected by a bend 1 18.
- the first inner wall 102 is parallel to the transmitting-receiving surface
- the first inner wall 102 is disk-shaped.
- the first lower wall 102 is distant, in the direction Z, from a first distance H1 of the transceiver surface 14.
- the second inner wall 104 is parallel to the transmitting-receiving surface 14.
- the second inner wall 104 is carried by the same part as the transmitting-receiving surface 14.
- the second inner wall 104 is in shape of a disc.
- the coaxial access port 106 is delimited in the Z direction by the transceiver surface 14 and the first inner surface 100.
- the coaxial access port 106 is cylindrical with a circular base, Z axis.
- cylindrical access port 106 has a first diameter D1.
- the third inner wall 108 faces the transceiver surface 14. In the Z direction, the third inner wall 108 is spaced a second distance H2 from the second inner wall 104.
- the positioning cavity 1 10 is configured to receive the dielectric device 1 12 in an inserted position.
- the positioning cavity 1 10 is cylindrical with a circular base.
- the positioning cavity 1 10 has a second diameter D2.
- the positioning cavity 1 10 has a first depth P1.
- the dielectric device 1 12 has a first end 120, a second end 122, a lateral surface 124 and a cavity 126 for receiving the elementary antenna 12.
- the first rectilinear portion 1 14 extends along the Z direction while the second straight portion 1 16 extends along the Y direction.
- the first rectilinear portion 1 14 has a first length L1 along the Z direction.
- the first rectilinear portion 1 14 is cylindrical, Z axis.
- the first straight portion 1 14 is cylindrical with a circular base.
- the first rectilinear portion 1 14 has a third diameter D3.
- the second rectilinear part 1 16 has a second length L2 along the direction X.
- the second rectilinear part 1 16 is cylindrical with axis X.
- the second part rectilinear 1 16 has a fourth diameter D4.
- the fourth diameter D4 is equal to the third diameter D3.
- the first length L1 is greater than the second length L2. According to the example of FIG. 11, the first length L1 is greater than twice the second length L2.
- the first end 120 is able to be inserted into the positioning cavity 1 10.
- the first end 120 is flat.
- the first end 120 is perpendicular to the Z direction.
- the first end 120 is cylindrical with a circular base, and has a fifth diameter D5.
- the fifth diameter D5 is less than or equal to the second diameter D2.
- the second end 122 is parallel to the first end 120.
- the second end 122 is flat.
- the second end 122 is cylindrical with a circular base, and has a sixth diameter D6.
- the sixth diameter D6 is greater than or equal to the fifth diameter D5.
- the sixth diameter D6 is less than or equal to the first diameter D1.
- the lateral surface 124 has a symmetry of revolution about the Z axis.
- the lateral surface 124 has a first end portion 128, a second end portion 130 and a medial portion 132.
- the receiving cavity 126 is configured to receive the rod 100.
- the receiving cavity 126 is able to hold the rod 100 in position relative to the dielectric device 1 12.
- the receiving cavity 126 is formed by the union of an axial cavity 134 and a lateral cavity 136.
- the first end portion 128 is located between the middle portion 132 of the lateral surface 124 and the first end 120.
- the first end portion 128 has a first shoulder 137, a first portion 138 delimited in the Z direction by the shoulder 137 and the first end 120, and a second portion 139 delimited in the direction Z by the shoulder 137 and the middle portion 132.
- the first shoulder 137 is located at a third distance H3 from the first end 120.
- the third distance H3 is less than or equal to the depth P1.
- the first shoulder 137 is located at a fourth distance H4 from the second end 122. In FIG. 10, the fourth distance H4 is equal to the second distance H2.
- the first portion 138 is complementary to the positioning cavity 1.
- the first portion 138 is cylindrical with a Z axis.
- the first portion 138 is cylindrical with a circular base.
- the diameter of the first portion 138 is equal to the fifth diameter D5.
- the first portion 138 is able to be mounted tightened in the positioning cavity 1 10.
- the fifth diameter D5 is equal to the second diameter D2.
- the second portion 139 is cylindrical with a Z axis.
- the second portion 139 is cylindrical with a circular base.
- the diameter of the second portion 139 is equal to the sixth diameter D6.
- the second end portion 130 is located between the middle portion 132 of the lateral surface 124 and the second end 122.
- the second end portion 120 is cylindrical with Z axis.
- the second end portion 130 is cylindrical to circular base.
- the diameter of the second end portion 130 is equal to the sixth diameter D6.
- the middle portion 132 is located between the first end portion 128 and the second end portion 130.
- the middle portion 132 is delimited in the Z direction by a second shoulder 140 and a third shoulder 142.
- the middle portion 132 includes, in addition, a crown 144.
- the second shoulder 140 is included, in the Z direction, between the crown 144 and the first end 120.
- the third shoulder 142 is included, in the direction Z, between the crown 144 and the second end 122. In the direction Z, the third shoulder 142 is located at a fourth distance H4 from the second end 122. In Figure 1 1, the fourth distance H4 is equal to the first distance H1.
- the axial cavity 134 extends between the second end 122 and the first shoulder 142.
- the axial cavity 134 is adapted to receive the first rectilinear portion 1 14 by a translation along the Y direction.
- the axial cavity 134 is parallelepipedal.
- the three pairs of sides of the axial cavity 134 are respectively perpendicular to the directions X, Y and Z.
- the axial cavity 134 has a first width 11 greater than or equal to the third diameter D3.
- the first width 11 is equal to the third diameter D3.
- the lateral cavity 136 is between the second shoulder 142 and the third shoulder 144.
- the lateral cavity 136 is adapted to receive the second rectilinear portion 1 16 by a translation along the Y direction.
- the lateral cavity 136 is parallelepipedal.
- the three pairs of sides of the axial cavity 134 are respectively perpendicular to the directions X, Y and Z.
- the lateral cavity 136 has a second width 12 greater than or equal to the fourth diameter D4.
- the second width 12 is equal to the fourth diameter D4.
- the ring 144 is cylindrical with a circular base, Z axis.
- the ring 144 has a seventh diameter D7.
- the seventh diameter D7 is greater than or equal to the sixth diameter D6. In FIG. 11, the seventh diameter D7 is smaller than the first diameter D1.
- the crown 144 is delimited in the direction Z by the second shoulder 142 and the third shoulder 144.
- the crown 144 In the direction Z, the crown 144 has a third width L3.
- the third width L3 is greater than the fourth diameter D4.
- the operation of the antenna structure 10 according to the third embodiment is similar to the operation of the antenna structure 10 according to the first embodiment.
- the straightness of the dielectric device January 12 is fixed by the construction of the radome 16 and the positioning cavity 1 10. No specific tool is therefore used to fix the straightness of the dielectric device 12.
- the dielectric device 1 12 is fixed relative to the radome 16, in the absence of a force exerted by an operator. This means that, when the dielectric device 1 12 is in its inserted position, the positioning cavity 1 10 exerts on the dielectric device a clamping force greater than the sum of the weights of the dielectric device 1 12 and the elementary antenna 12.
- FIG. 12 and 13 show an arrangement 200 of antenna structures 10 in which the antenna structures 10 are all antenna structures 10 according to the second embodiment.
- arrangement is meant a set of a plurality of independent antenna structures 10, each antenna structure 10 occupying a respective predetermined position.
- Each antenna structure 10 is adapted to be controlled independently of each of the other antenna structures 10.
- the input 24 of each antenna structure 10 is connected to a respective electromagnetic wave source (not shown).
- each of the antenna structures 10 of the arrangement 200 is identical to the operation of an antenna structure 10 which is not part of the arrangement 100.
- the antenna structures 10 of the arrangement 200 are antenna structures 10 according to the first embodiment.
- the antenna structures 10 of the arrangement 200 are not all identical.
- the antenna structures 10 used for the arrangement 200 are such that their transceiver surface 14 comprises an axis of symmetry.
- At least two axes of symmetry of the transmission-reception surfaces 14 are concurrent since all the axes of symmetry of the transmission-reception surfaces 14 of the antenna structures 10 have at least one point in common with each other. another axis of symmetry of a transmission-reception surface 14 of another antenna structure 10.
- the arrangement 200 comprises an axis of symmetry denoted D200.
- the antenna structures 10 are arranged in four groups 202,
- the first group 202 includes six antenna structures 10; the second group 204 includes eleven antennal structures 10; the third group 206 groups together fifteen antennal structures 10 and the fourth group 208 groups together a single antenna structure 10.
- Each group 202, 204, 206, 208 groups antenna structures whose axis of symmetry with the transceiving surface 14 is at the same angle with the axis of symmetry D200 of the arrangement 200.
- the axis of symmetry of each of the transmission-reception surfaces 14 of the antenna structures 10 of the first group 202 forms an angle a1 between 0 ° and 30 ° with the axis of symmetry D200 of the arrangement 200 of FIG. antennal structures.
- a1 is equal to 30 °.
- the axis of symmetry of each of the transmission-reception surfaces 14 of the antenna structures 10 of the second group 204 forms an angle ⁇ 2 between 30 ° and 60 ° with the axis of symmetry D200 of the arrangement 200 of antenna structures.
- a2 is equal to 60 °.
- each of the transmission-reception surfaces 14 of the antenna structures 10 of the third group 206 forms an angle a3 between 60 ° and 90 ° with the axis of symmetry D200 of the arrangement 200 of antenna structures.
- a3 is equal to 90 °.
- the antenna structure 10 of the fourth group 208 has a transmitting-receiving surface normal to the axis of symmetry D200 of the arrangement 200 of antennal structures.
- antenna structures 10 are possible, the number of groups not being imposed. In addition, the number of antenna structures 10 in groups is also free. Preferably, the number of antenna groups and structures 10 is chosen so that the arrangement 200 has a good overlap in the half-space. It is understood by the term "a good overlap" that the angle for which a gain of at least 10 dB is obtained for the arrangement 200 is greater than 120 °. In this sense, the arrangement 200 may be termed a faceted network.
- the proposed arrangement 200 makes it possible to ensure the functions of several antenna structures 10 in the X and Ku bands of satellite telecommunications, in the absence of motorization with good coverage, compact layout and good efficiency due to the performance of the antennas.
- antennal structures 10 used.
- the proposed arrangement 200 can be used in substitution of a small parabolic antenna and / or a scanning antenna for telecommunications applications between two stations, in particular by satellite. It should be noted that in this case, the radiation pattern of the antenna structure 10 thus produced is in accordance with the templates specified for use with certain satellites.
- Such an arrangement 200 is advantageously usable in a platform, especially aerial. In the context of this use, the compactness of the arrangement 200 makes it possible to reduce the constraints on the implementations of equipment in the platform.
- Such an arrangement 200 is also advantageously usable in an underwater context: the arrangement 200 is emerged and in wire connection with a submerged underwater platform. The underwater platform is then able to communicate with the outside via the arrangement 200.
Landscapes
- Details Of Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1302760A FR3013908B1 (fr) | 2013-11-28 | 2013-11-28 | Agencement de structures antennaires pour telecommunications par satellites |
| PCT/EP2014/075995 WO2015079037A2 (fr) | 2013-11-28 | 2014-11-28 | Agencement de structures antennaires pour télécommunications par satellites |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3075031A2 true EP3075031A2 (fr) | 2016-10-05 |
| EP3075031B1 EP3075031B1 (fr) | 2024-05-22 |
Family
ID=50288140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14803174.3A Active EP3075031B1 (fr) | 2013-11-28 | 2014-11-28 | Agencement de structures antennaires pour télécommunications par satellites |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3075031B1 (fr) |
| ES (1) | ES2984634T3 (fr) |
| FR (1) | FR3013908B1 (fr) |
| WO (1) | WO2015079037A2 (fr) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5874927A (en) * | 1996-10-21 | 1999-02-23 | Knowles; Patrick J. | Tilted element antenna having increased effective aperture and method therefor |
-
2013
- 2013-11-28 FR FR1302760A patent/FR3013908B1/fr active Active
-
2014
- 2014-11-28 WO PCT/EP2014/075995 patent/WO2015079037A2/fr not_active Ceased
- 2014-11-28 ES ES14803174T patent/ES2984634T3/es active Active
- 2014-11-28 EP EP14803174.3A patent/EP3075031B1/fr active Active
Non-Patent Citations (1)
| Title |
|---|
| None * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3013908A1 (fr) | 2015-05-29 |
| WO2015079037A2 (fr) | 2015-06-04 |
| EP3075031B1 (fr) | 2024-05-22 |
| WO2015079037A3 (fr) | 2015-07-23 |
| ES2984634T3 (es) | 2024-10-30 |
| FR3013908B1 (fr) | 2016-01-01 |
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