EP3968465B1 - Antenne mit verbesserter abdeckung über einen erweiterten frequenzbereich - Google Patents

Antenne mit verbesserter abdeckung über einen erweiterten frequenzbereich

Info

Publication number
EP3968465B1
EP3968465B1 EP21192596.1A EP21192596A EP3968465B1 EP 3968465 B1 EP3968465 B1 EP 3968465B1 EP 21192596 A EP21192596 A EP 21192596A EP 3968465 B1 EP3968465 B1 EP 3968465B1
Authority
EP
European Patent Office
Prior art keywords
antenna
cavity
frequency band
mhz
substrate
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.)
Active
Application number
EP21192596.1A
Other languages
English (en)
French (fr)
Other versions
EP3968465C0 (de
EP3968465A1 (de
Inventor
Nicolas ATTAJA
Mauro Ettorre
Ronan Sauleau
Davy GUIHARD
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centre National de la Recherche Scientifique CNRS
Universite de Rennes 1
ArianeGroup SAS
Original Assignee
Centre National de la Recherche Scientifique CNRS
Universite de Rennes 1
ArianeGroup SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Centre National de la Recherche Scientifique CNRS, Universite de Rennes 1, ArianeGroup SAS filed Critical Centre National de la Recherche Scientifique CNRS
Publication of EP3968465A1 publication Critical patent/EP3968465A1/de
Application granted granted Critical
Publication of EP3968465C0 publication Critical patent/EP3968465C0/de
Publication of EP3968465B1 publication Critical patent/EP3968465B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
    • H01Q1/288—Satellite antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • 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
    • H01Q19/108—Combination of a dipole with a plane reflecting surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/42—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more imbricated arrays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/48—Combinations of two or more dipole type antennas

Definitions

  • the present invention relates to an antenna capable of transmitting with wide coverage in several frequency bands, enabling it to perform several distinct communication functions on its own.
  • Space vehicles are equipped with antennas which ensure communication between these vehicles and ground stations during the flight phases.
  • Achieving these functions may require the use of a complex system with several antennas, each associated with a particular function, these antennas each transmitting in distinct frequency ranges.
  • the document FR 2 854 737 describes a multi-beam and/or multi-frequency BIP material antenna allowing workers around two distinct working frequencies.
  • single-mode we mean that only the fundamental mode of the resonant cavity considered can propagate.
  • most single-mode we mean that the resonant cavity considered is single-mode over at least 50%, for example at least 75%, of the frequency band considered. In this case, the resonant cavity may not be single-mode on at least one end of the frequency band, it may be modeless or dual-mode on that end.
  • the radiating antenna element is present on a substrate covering the waveguide, and the antenna has one or more openings between a wall delimiting the first cavity and the substrate.
  • Such a feature allows to obtain an improved gain at low elevation angles in the second frequency band.
  • an edge of said wall located on the substrate side may have a crenellated shape thus defining a plurality of openings between said wall and the substrate.
  • Such a feature allows for improved gain at low elevation angles in the second frequency band while limiting gain decline in the first frequency band.
  • a ratio RA1 H1/H2 is between 1 and 3.25, where H1 denotes a height of the first cavity and H2 a height of the second cavity.
  • Such a feature allows to further improve the gain at low elevation angles in the second frequency band.
  • the ratio RA1 is preferably between 1.28 and 2.2.
  • the first frequency band corresponds to frequencies between 1164 MHz and 1591 MHz and the second frequency band corresponds to frequencies between 2200 MHz and 2290 MHz.
  • the first frequency band corresponds to the Global Positioning System (“GNSS”) application and the second frequency band to telemetry applications.
  • GNSS Global Positioning System
  • the invention also relates to a vehicle equipped with at least one antenna as described above.
  • the vehicle may be a space vehicle, such as a space launcher, an exploration vehicle or a satellite.
  • the use of the antenna described is not limited to a space application, it can be used on other vehicles such as a train, a car or an aircraft.
  • FIG. 1 represents a first example of an antenna 1 according to the invention comprising a substrate 3 on which a radiating antenna element 5 is present.
  • the substrate 3 may be a dielectric substrate.
  • the substrate 3 may be made of a composite material, for example reinforced with glass.
  • a substrate 3 marketed under the reference RO3210 ® by the company ROGERS Corporation may be used.
  • the substrate 3 may have a planar shape. It will be noted, however, that the presence of the substrate 3 is not necessary, the radiating antenna element being able to alternatively be formed by a self-supporting metal part.
  • the radiating element 5 is, in the example illustrated, of the double crossed dipole or dual-band asymmetric crossed dipole type and comprises a first pair of dipoles 5a and 5b which are perpendicular to each other and fed with a phase shift of 90°, and a second pair of dipoles 5c and 5d, distinct from the first pair, which are perpendicular to each other and fed with a phase shift of 90°.
  • the dipoles 5a and 5b of the first pair have a different length from the dipoles 5c and 5d of the second pair.
  • the dipoles 5a-5d of the first and second pairs each have a trapezoidal shape in the illustrated example.
  • the dipoles 5a-5d form in the illustrated example a radiating element 5 having a bow-tie structure.
  • the dipoles 5a-5d are present on both sides of the substrate (on the upper face and on its opposite lower face).
  • the radiating element 5 is capable of emitting a signal in the radiofrequency spectrum, this signal having a circular polarization in at least a first frequency band and in a second frequency band, separate from the first band and at a higher frequency than the latter.
  • the first frequency band may correspond to frequencies between 1164 MHz and 1591 MHz and the second frequency band to frequencies between 2200 MHz and 2290 MHz.
  • a coaxial cable 6 feeds the radiating element 5.
  • the radiating element 5 of the double crossed dipole or dual-band asymmetric crossed dipole type is known per se, the invention is nevertheless not limited to this type of radiating element, it is possible alternatively to use a radiating element formed by a crossed dipole or other types of dual-band or wideband radiating elements such as crossed dipoles coupled to resonators for example, for example.
  • the radiating element 5 may have a planar shape, as illustrated.
  • the radiating element 5 may be devoid of vertical elements, directed along the direction Z, perpendicular to the plane P containing the radiating element 5 and the substrate 3 in the illustrated example.
  • the waveguide 7 comprises a first resonant cavity 11 which is single-mode or predominantly single-mode in the first frequency band.
  • the first resonant cavity 11 may not be single-mode, nor predominantly single-mode, in the second frequency band.
  • the waveguide 7 further comprises a second resonant cavity 13 which is distinct from the first cavity 11 and nested in the latter.
  • the second resonant cavity 13 is single-mode or predominantly single-mode in the second frequency band.
  • the second cavity 13 may not be single-mode, nor predominantly single-mode, in the first frequency band.
  • the first cavity 11 helps to increase the gain in the upper hemisphere, thanks to the presence of the reflector 9 which reflects the waves upwards, thus increasing the gain in the upper hemisphere, and to broaden the frequency band in which the antenna 1 emits by allowing the generation of a second circularly polarized signal in addition to the signal generated by the radiating element and corresponding to a distinct frequency range. If only the first cavity 11 is used, there is generation of higher order modes beyond the cut-off frequency of the second mode TM01 which disturbs the gain in the second frequency band, in particular at low elevation angles.
  • the addition of the second cavity 13 allows a significant improvement in the gain at low elevation angles in the second frequency band by only allowing the excitation of the first modes in the second frequency band.
  • the radiating element 5 is located above the first 11 and second 13 cavities on the side opposite the reflector 9.
  • the waveguide 7 is, in the example illustrated, closed in its lower part by the reflector 9 which defines a base common to the first 11 and second 13 cavities and delimits the latter.
  • the reflector 9 is in contact with the first 11 and second 13 cavities.
  • the waveguide 7 is open in its upper part, opposite the reflector 9, in the absence of the radiating element 5 and the substrate 3.
  • the first 11 and second 13 cavities are closed in their lower part by the reflector 9 and closed laterally, and are open in their upper part opposite the reflector 9, in the absence of the radiating element 5 and the substrate 3.
  • the first 11 and second 13 cavities are located below the radiating element 5.
  • the substrate 3 positioned on the waveguide 7 closes the latter and the first cavity 11 by coming into contact with the latter.
  • the invention does not require such contact as will be described below.
  • the assembly of the first 11 and second 13 cavities and the reflector 9 may be entirely metallic.
  • the first cavity 11 has dimensions greater than the second cavity 13.
  • the second cavity 13 has a height H2 less than or equal to the height H1 of the first cavity 11.
  • the largest dimension D1 of the first cavity 11 is greater than the largest dimension D2 of the second cavity 13.
  • These largest dimensions D1 and D2 may be diameters in the illustrated example of a circular geometry for the first 11 and second 13 cavities.
  • the second cavity 13 is centered relative to the first cavity 11.
  • the first and second cavities each have a circular shape, but it is not outside the scope of the invention when the latter have a different shape, such as a polygonal shape, for example rectangular or octagonal, as will be described below.
  • the walls of the first 11 and second 13 cavities may be solid, that is to say without a slot or lack of material.
  • the coaxial cable 6 extends inside the first 11 and second 13 cavities through the latter.
  • the RA1 H1/H2 ratio is between 1 and 3.25, for example between 1.28 and 2.2.
  • the ratio RA2 D1/D2 can be between 1.19 and 2.1. Changing the ratio RA2 makes it possible to modulate the frequency bands in which the antenna 1 transmits depending on the desired application.
  • the first 11 and second 13 cavities are sized so as to be single-mode or predominantly single-mode in the first frequency band and in the second frequency band respectively.
  • the choice of the dimensions to be adopted for this purpose is part of the general knowledge of the person skilled in the art.
  • the radii of the cavities 11 and 13 can be defined as a function of the cut-off frequencies of a circular waveguide calculated using the formula below.
  • p' nm denote the roots of the Bessel functions of the first kind, a the radius of the desired waveguide, ⁇ and ⁇ the dielectric permittivity and the magnetic permeability of the medium respectively.
  • the parameters n and m correspond to the order of the mode guided by the section of the cavity, here circular.
  • a waveguide 7 having a radius R1 of between 125 mm and 155 mm, for example between 135 mm and 150 mm, a radius R2 of between 75 mm and 105 mm, for example between 80 mm and 95 mm, a height H1 of between 35 mm and 60 mm, for example between 45 mm and 55 mm, and a height H2 of between 25 mm and 40 mm, for example between 25 mm and 35 mm.
  • the radii R1 and R2 are respectively taken as being equal to half of the largest dimension of the first and second cavities and do not necessarily imply that the waveguide is of circular geometry. These values were determined by taking a dielectric permittivity and a magnetic permeability of the medium filling the cavities equal to 1 (permittivity and permeability of the vacuum).
  • a waveguide 7 having a radius R1 of 140 mm, a radius R2 of 90 mm, a height H1 of between 35 mm and 60 mm, for example of between 45 mm and 55 mm, and a height H2 of between 25 mm and 40 mm, for example of between 25 mm and 35 mm.
  • a waveguide 7 having a height H1 of 50 mm, a height H2 of 25 mm, a radius R1 between 125 mm and 155 mm, for example between 135 mm and 150 mm, and a radius R2 between 75 mm and 105 mm, for example between 80 mm and 95 mm.
  • the opening 20 extends 360° around the axis of the first 11 and second 13 cavities, corresponding to the Z axis.
  • the height H3 of the opening 20 may be less than or equal to H1-H2, for example less than or equal to 25 mm, for example between 0.25 mm and 25 mm.
  • Increasing H3 makes it possible to further improve the gain for low elevation angles in the second frequency band. It is nevertheless preferable not to increase H3 too much so as not to lower the gain too much in the first frequency band.
  • this parameter H3 offers an additional degree of freedom to optimize the antenna.
  • the substrate 3 is not in contact with the first cavity 11 and is present at a predetermined non-zero distance from the latter.
  • an edge 22 of the wall 110 of the first cavity has a crenellated shape defining a plurality of openings 24 between the substrate 3 and the wall 110.
  • the openings 24 may each have the same shape and/or the same dimensions. Alternatively, the openings 24 differ in terms of shape and/or dimensions.
  • the openings 24 may, as illustrated, be present all around the Z axis of the first and second cavities (at 360° around this Z axis). The openings 24 may or may not be regularly distributed around the Z axis of the first and second cavities.
  • the height H4 of the openings 24 may be less than or equal to H1-H2, for example less than or equal to 25 mm, for example between 0.25 mm and 25 mm.
  • the increase in H4 makes it possible to further improve the gain for low elevation angles in the second frequency band.
  • the 24 apertures have the same effects as the 20 aperture but with a lesser impact on the gain of the first frequency band (increasing the height of the 24 apertures lowers the gain in the first frequency band less).
  • waveguides having a circular geometry have just been described, but it does not depart from the scope of the invention when the waveguide has another geometry such as a polygonal shape, for example rectangular or octagonal.
  • a person skilled in the art knows how to size the resonant cavities for geometries other than circular by using formulas other than the formula [Math. 1] indicated above for the circular case.
  • the examples which have just been described comprise only two resonant cavities 11 and 13, but it does not depart from the scope of the invention if the waveguide comprises more than two resonant cavities, for example three nested resonant cavities, the third resonant cavity being single-mode or predominantly single-mode in a third frequency band separate from the first and second frequency bands. This makes it possible to have an antenna transmitting with improved gain in more than two frequency bands.
  • This figure shows the minimum value of the gain for any azimuth angle combined.
  • the diagram is a comparative diagram showing the effect of adding the second cavity 13 in a first cavity 11 or 110, and showing the influence of the presence of the openings 20 or 24.
  • Opening 20 has a height H3 of 10 mm and openings 24 a height H4 of 15 mm.
  • Curve A1 corresponds to the gain obtained with the first 11 and second 13 cavities without opening as in figure 1
  • the A3 curve at the gain obtained with the 24 openings as at the figure 3 and curve B corresponds to the gain obtained without the second cavity 13, only with the first cavity 11.
  • a significant improvement in the gain is observed in the second frequency band between 2200 MHz and 2290 MHz when the second cavity 13 is present.
  • an improvement is observed additional gain in the second frequency band when apertures 20 and 24 are present.
  • the antenna evaluated included a radiating antenna element of the double crossed dipole type present on a substrate marketed under the reference RO3210 ® by the company ROGERS Corporation and had only a first resonant cavity (no second cavity) of square shape with a side of 140 mm and a height of 50 mm.
  • FIG. 7 shows the gain diagram obtained at this frequency for an antenna which had a first and a second octagonal-shaped cavities.
  • the first cavity had a larger dimension of 140 mm and a height of 50 mm and the second cavity a larger dimension of 90 mm and a height of 25 mm.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Aerials With Secondary Devices (AREA)
  • Waveguide Aerials (AREA)

Claims (10)

  1. Antenne (1; 10; 100), umfassend:
    - ein strahlendes Antennenelement (5), das geeignet ist, um ein Signal in mindestens einem ersten Frequenzband und in einem zweiten Frequenzband, das von dem ersten Band getrennt ist und eine höhere Frequenz aufweist dieses, zu emittieren, und
    - einen Wellenleiter (7), der von dem strahlenden Antennenelement bedeckt ist, umfassend mindestens einen ersten Hohlraum (11), der resonant und monomodal ist oder über mindestens 50 % in dem ersten Frequenzband als monomodal betrachtet wird, und einen zweiten Hohlraum (13), der sich von dem ersten resonanten Hohlraum unterscheidet und sich in dessen Inneren befindet,
    wobei der zweite resonante Hohlraum über mindestens 50 % in dem zweiten Frequenzband monomodal ist oder als monomodal betrachtet wird,
    dadurch gekennzeichnet, dass ein Verhältnis RA1 H1/H2 zwischen 1 bis 3,25 liegt, wobei H1 eine Höhe des ersten Hohlraums (11) und H2 eine Höhe des zweiten Hohlraums (13) bezeichnet.
  2. Antenne (10; 100) nach Anspruch 1, wobei das strahlende Antennenelement (5) auf einem Substrat (3) vorhanden ist, das den Wellenleiter (7) bedeckt, und wobei die Antenne zwischen einer Wand, die den ersten Hohlraum (11) begrenzt, und dem Substrat (3) eine oder mehrere Öffnungen (20; 24) aufweist.
  3. Antenne (100) nach Anspruch 2, wobei ein Rand (22) der Wand, die sich auf der Seite des Substrats (3) befindet, eine Zinnenform aufweist, wodurch zwischen der Wand und dem Substrat eine Vielzahl von Öffnungen (24) definiert ist.
  4. Antenne (1; 10; 100) nach einem der Ansprüche 1 bis 3, wobei das erste Frequenzband den Frequenzen entspricht, die zwischen 1164 MHz und 1591 MHz liegen, und das zweite Frequenzband den Frequenzen entspricht, die zwischen 2200 MHz und 2290 MHz liegen.
  5. Antenne nach einem der Ansprüche 1 bis 4, wobei das Verhältnis RA1 H1/H2 zwischen 1,28 und 2,2 liegt.
  6. Antenne nach einem der Ansprüche 1 bis 5, wobei ein Verhältnis RA2 D1/D2 zwischen 1,19 und 2,1 liegt, wobei D1 die größte Abmessung des ersten Hohlraums bezeichnet und D2 die größte Abmessung des zweiten Hohlraums bezeichnet.
  7. Antenne nach einem der Ansprüche 1 bis 6, wobei der Wellenleiter in seinem unteren Abschnitt einen Reflektor (9) umfasst, der eine gemeinsame Basis für den ersten und den zweiten Hohlraum bildet.
  8. Fahrzeug, das mit mindestens einer Antenne (1; 10; 100) nach einem der Ansprüche 1 bis 7 ausgerüstet ist.
  9. Fahrzeug nach Anspruch 8, wobei das Fahrzeug ein Raumfahrzeug ist.
  10. Raumfahrzeug nach Anspruch 9, wobei das Fahrzeug eine Trägerrakete für den Weltraum, ein Erkundungsfahrzeug oder ein Satellit ist.
EP21192596.1A 2020-09-11 2021-08-23 Antenne mit verbesserter abdeckung über einen erweiterten frequenzbereich Active EP3968465B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2009240A FR3114195B1 (fr) 2020-09-11 2020-09-11 Antenne à couverture améliorée sur un domaine de fréquence élargi

Publications (3)

Publication Number Publication Date
EP3968465A1 EP3968465A1 (de) 2022-03-16
EP3968465C0 EP3968465C0 (de) 2025-10-01
EP3968465B1 true EP3968465B1 (de) 2025-10-01

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ID=74125334

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Application Number Title Priority Date Filing Date
EP21192596.1A Active EP3968465B1 (de) 2020-09-11 2021-08-23 Antenne mit verbesserter abdeckung über einen erweiterten frequenzbereich

Country Status (4)

Country Link
US (1) US11658421B2 (de)
EP (1) EP3968465B1 (de)
ES (1) ES3055332T3 (de)
FR (1) FR3114195B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102024108137A1 (de) * 2024-03-21 2025-09-25 Continental Automotive Technologies GmbH Antenneneinheit eines Fahrzeugs

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120268347A1 (en) * 2011-04-25 2012-10-25 Topcon Positioning Systems, Inc. Compact Dual-Frequency Patch Antenna

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042935A (en) * 1974-08-01 1977-08-16 Hughes Aircraft Company Wideband multiplexing antenna feed employing cavity backed wing dipoles
US4183027A (en) * 1977-10-07 1980-01-08 Ehrenspeck Hermann W Dual frequency band directional antenna system
US5548299A (en) * 1992-02-25 1996-08-20 Hughes Aircraft Company Collinearly polarized nested cup dipole feed
FR2760131B1 (fr) * 1997-02-24 1999-03-26 Alsthom Cge Alcatel Ensemble d'antennes concentriques pour des ondes hyperfrequences
FR2841390B1 (fr) * 2002-06-25 2004-09-24 Jacquelot Technologies Dispositif rayonnant bi-bande a double polarisation
FR2854737A1 (fr) * 2002-10-24 2004-11-12 Centre Nat Rech Scient Antenne a materiau bip multi-faisceaux et/ou multi- frequences et systeme mettant en oeuvre ces antennes.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120268347A1 (en) * 2011-04-25 2012-10-25 Topcon Positioning Systems, Inc. Compact Dual-Frequency Patch Antenna

Also Published As

Publication number Publication date
EP3968465C0 (de) 2025-10-01
FR3114195B1 (fr) 2023-11-03
ES3055332T3 (en) 2026-02-11
US11658421B2 (en) 2023-05-23
FR3114195A1 (fr) 2022-03-18
US20220085500A1 (en) 2022-03-17
EP3968465A1 (de) 2022-03-16

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