EP4012839A1 - Antennennetz mit gerichteter strahlung - Google Patents

Antennennetz mit gerichteter strahlung Download PDF

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Publication number
EP4012839A1
EP4012839A1 EP21213414.2A EP21213414A EP4012839A1 EP 4012839 A1 EP4012839 A1 EP 4012839A1 EP 21213414 A EP21213414 A EP 21213414A EP 4012839 A1 EP4012839 A1 EP 4012839A1
Authority
EP
European Patent Office
Prior art keywords
antenna
metallic
antennas
antenna array
pair
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.)
Pending
Application number
EP21213414.2A
Other languages
English (en)
French (fr)
Inventor
Lotfi Batel
Lionel Rudant
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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 Commissariat a lEnergie Atomique CEA, Commissariat a lEnergie Atomique et aux Energies Alternatives CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP4012839A1 publication Critical patent/EP4012839A1/de
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/247—Supports; Mounting means by structural association with other equipment or articles with receiving set with frequency mixer, e.g. for direct satellite reception or Doppler radar
    • 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
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • 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
    • 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
    • H01Q5/10—Resonant antennas
    • 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
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/36—Vertical arrangement of element with top loading

Definitions

  • the present invention relates to a directional radiation antenna array adapted to operate in at least one predetermined frequency band.
  • the invention lies in the field of communications in which directional radiation is desired, and more particularly in the field of communication for geolocation and satellite navigation.
  • a GNSS satellite geolocation system (acronym for "Global Navigation Satellite Systems”) comprises a receiver of signals emitted by satellites, equipped with an antenna or an antenna array for reception which has good directivity, maximum gain in direction of the zenith for the reception of signals emitted by the satellites, and a right circular polarization, also called RHCP polarization for “Right Hand Circular Polarization”.
  • GNSS receivers are on board a carrier, for example a motor vehicle, or any other type of vehicle.
  • ceramic antennas are known, for example patch antennas on ceramic substrate, which are miniature, and make it possible to produce directional radiation and radiation of right circular polarization, which allows good operation for the application in GNSS systems. Nevertheless, the cost of the material forming such antennas is incompressible, which limits the large-scale deployment of multi-band GNSS which requires ceramic patches superimposed on each other.
  • Multiwire antennas of helical geometry are also known, the wires being wound around a cylinder of dielectric material and resting on a reflective plane.
  • the number of wires of the antenna allows operation on several frequency bands for communication with several satellites.
  • the size of the antenna is significant and can reach heights of the order of 20 cm.
  • the object of the invention is to remedy the drawbacks of the state of the art by proposing an antenna array with directional radiation, in circular polarization, in particular in right circular polarization, which is both compact and inexpensive.
  • the proposed antenna array is made from metal antennas, the manufacturing cost of which is low, and the proposed arrangement makes it possible to achieve the properties of directivity and circular polarization while making it possible to make a compact antenna.
  • the antenna array according to the invention can also have one or more of the characteristics below, taken independently or according to all technically conceivable combinations.
  • the chosen circular polarization is a right circular polarization.
  • the antenna array comprises two pairs of metal antennas, each pair of metal antennas being adapted to operate in an associated frequency band, so as to produce a dual frequency band antenna.
  • a first pair of metallic antennae is formed by two antennae each having a radiating element of first length
  • a second pair of resonant metallic antennae is formed by two antennae each having a radiating element of second length, the second length being different from the first length
  • the predetermined angle of rotation is an angle of 90°.
  • the antenna array comprises four pairs of metal antennas, arranged symmetrically around a center of rotation of said sequential rotation.
  • Each metal antenna is an inverted-F planar antenna.
  • Each pair of metal antennas comprises two inverted-F planar metal antennas of the same dimensions, each inverted-F planar metal antenna comprising a folded capacitive roof connected to the ground plane by a short circuit and a metal supply wire connected to said circuit dump.
  • Each metal antenna of a pair of metal antennas is produced by printing on a card.
  • the load circuit is made up of passive components of a capacitive, inductive, resistive nature or a combination of these components.
  • the invention relates to a satellite geolocation system comprising an antenna array as briefly described above.
  • a first embodiment of an antenna array according to the invention, forming a micro array of antennas, is illustrated with reference to the figures 1 to 3 .
  • the figure 1 schematically represents, in top view, an antenna array 2 according to a first embodiment of the invention.
  • the figure 2 , 3 schematically represent the antenna array 2 in perspective, in an orthogonal 3D reference frame (X,Y,Z).
  • the antenna array 2 comprises a ground plane 4, on which is printed a load circuit 6 of the antenna array.
  • the antenna array 2 is configured to operate in a predetermined frequency band, centered on a given central frequency.
  • the antenna array 2 has a central frequency equal to 1575 MHz.
  • the antenna array 2 comprises, in the embodiment of the figure 1 , a pair of metallic antennas formed of a first metallic antenna 8 and a second metallic antenna 10.
  • Each metallic antenna 8, 10 comprises a radiating element whose central resonant frequency belongs to the chosen frequency band.
  • each of said first metallic antenna 8 and second metallic antenna 10 is an inverted-F antenna or PIFA antenna (acronym for “Planar Inverted F-Antenna”).
  • PIFA antennas are conventionally used in the field of radio communications.
  • the two PIFA antennas 8, 10 are structurally identical.
  • the second PIFA antenna 10 is arranged in sequential rotation with respect to the first PIFA antenna 8, orthogonally with respect to the first PIFA10 antenna.
  • each PIFA antenna 8, 10 extends along a respective axis A1, A2, the antennas being positioned so that the axes A1, A2 are perpendicular.
  • sequential rotation is meant a rotation, in a predetermined direction of rotation, with respect to a predetermined center of rotation, and a chosen associated angle of rotation.
  • the center of rotation is a point located substantially at the center of the antenna array, for example a point located on an axis perpendicular to the ground plane 4, which intersects the ground plane at the center of the antenna array.
  • the second PIFA antenna placed orthogonally to the first PIFA antenna corresponds to a sequential rotation of an angle of rotation equal to 90° from the initial position of the first PIFA antenna 8.
  • the center of rotation is referenced O on the figure 1 , this is a point located substantially at the center of the antenna array 2.
  • each pair of antennae comprising two antennae in sequential rotation with an associated angle of rotation, forming several sequences of rotation around the center O of the antenna array.
  • the antenna array 2 further comprises a monopole antenna 12, which is placed at the center of the antenna array.
  • the monopole antenna 12 has as its center of symmetry the point O which is placed substantially at the center of the antenna array 2.
  • Each PIFA antenna 8, 10 comprises a folded capacitive roof 14, 16, and a metal supply strand 18, 20.
  • the capacitive roof 8, 10 is connected to the ground plane 4 by a short circuit 22, 24.
  • the monopole antenna 12 comprises a capacitive roof 26 and a metal feed strand 28, which extends, in the illustrated embodiment, in the vertical direction when the ground plane 4 is horizontal.
  • the capacitive roof 26 of the monopole antenna 12 has a square or rectangular geometric shape in the plane of the antenna array 2. According to variants, the capacitive roof 26 of the monopole antenna 12 has a different geometric shape, for example a disk shape, or any other chosen geometric shape.
  • the metal antennas 8, 10 are antennas of the patch type (or “microstrip antennas”), which operate in a similar manner.
  • each antenna 8, 10 comprises a capacitive roof and a feed strand 18, 20.
  • PIFA antennas in the embodiment with patch antennas, there is no provision for a short circuit 22, 24.
  • Each of the power supply strands 18, 20, 28 is connected to the load circuit 6 which is printed on the ground plane 4.
  • the load circuit 6 is schematically illustrated in picture 3 , in dotted lines.
  • the metallic antennas 8, 10, 12 are coupled, and the load circuit 6 is optimized to obtain adequate radiation.
  • the metal antennas 8, 10 are resonant and the monopole antenna 12 is non-resonant, its radiation being used to cancel the unwanted radiation component generated by the metal antennas of the pair of antennas 8, 10 as explained below.
  • the load circuit 6 is a load circuit having load impedances calculated by a calculation method under constraints as described in the patent EP2840654 B1 , to achieve a radiation objective illustrated in Figure 4 .
  • This method is based on the use of the principle of decomposition into spherical waves, which decomposes the electromagnetic field radiated by each antenna into a series of modes, and this by taking into account the coupling between the different antennas of the antenna array.
  • This optimization tool allows to apply a weighting on the series of radiation modes by boosting the desired modes and attenuating the unwanted modes. The optimal weighting obtained is then converted into complex impedances making it possible to produce the antenna load circuit.
  • the antenna array 2 is configured for operation in a frequency band for receiving signals transmitted by satellites for application in a GNSS receiver. It is desired that the antenna array have a directional operation in a given direction, i.e. at the zenith, in right circular polarization.
  • the desired radiation breaks down into two radiation modes which are respectively the transverse electric mode TE- 11 and the transverse magnetic mode TM- 11 .
  • these two radiation modes have the same amplitude and have respective phases of 0° and 180°, or, in other words, are in phase opposition.
  • the other radiation modes, respectively the TE 10 and TE 11 and TM 10 and TM 11 modes are zero.
  • the combination of the transverse electric TE- 11 and transverse magnetic TM- 11 modes of radiation gives rise to a radiation pattern with a maximum right circular polarization gain (RHCP) at the zenith and a minimum cross-polarization gain (LHCP) at the zenith.
  • RHCP right circular polarization gain
  • LHCP minimum cross-polarization gain
  • a radiation diagram 30, called the reference radiation diagram, is illustrated in figure 4 .
  • the radiation diagram presents the angular distribution of the radiated power as a function of the azimuth ⁇ .
  • the power is expressed in circular isotropic decibel (dBic).
  • RHCP right circular polarization gain
  • LHCP left circular polarization
  • a metallic PIFA antenna powered by an electric current, generates the transverse electric modes TE -11 , TE 11 and the transverse magnetic modes TM -11 , TM 10 and TM 11 .
  • the radiations in electric transverse mode TE 11 of two antennas are in phase opposition, and therefore cancel each other out when they are of the same amplitude.
  • the radiations in transverse magnetic mode TM 11 from two antennas are in phase opposition, and therefore cancel each other out when they are of the same amplitude.
  • transverse electric TE- 11 and transverse magnetic TM- 11 modes of the two PIFA antennas in sequential rotation are in phase and add up.
  • transverse magnetic mode TM 10 which has a phase at 90° for example for the first metal antenna PIFA 8 and at 180° for the second metal PIFA antenna 10.
  • the monopole antenna 12 emits radiation in transverse magnetic mode TM 10 , which is oriented, thanks to the optimization of the load circuit, to compensate for the radiation in transverse magnetic mode TM 10 from the metallic PIFA antennas 8, 10.
  • the monopole antenna 12 has a destructive contribution, the radiation in transverse magnetic mode TM 10 is cancelled.
  • This load circuit is composed, in one embodiment, of passive components of a capacitive, inductive, resistive or a combination of these components.
  • the load circuit parameters are calculated using the method described in the patent EP 2 840 654 B1 .
  • an antenna network 2 is developed for a GNSS geolocation and navigation system, for a receiver on board a motor vehicle.
  • the antenna array has the following dimensions: a height of 10mm and a square support with a side of 35mm, for operation at the central frequency of 1.575GHz.
  • the antenna array is optimized to form radiation with a maximum gain of 2dBic at zenith, with an axial ratio of 1dB and an RHCP polarization in the L1 frequency band around 1.575 GHz.
  • the charging circuit 6 is such that the first metal PIFA antenna 8 is powered by a radio frequency (RF) source of 50 ⁇ impedance, the second PIFA metal antenna 10 is charged by a capacitance of 2.7 pF and the monopole antenna 12 is charged by a capacitance of 10pF.
  • RF radio frequency
  • the figure 5 shows the radiation pattern 35 obtained by the antenna array 2 produced according to this concrete embodiment, this pattern comprising the right circular polarization gain (RHCP) 36 and the left circular polarization gain (LHCP) 38.
  • RHCP right circular polarization gain
  • LHCP left circular polarization gain
  • the antenna array comprises more than one pair of resonant metallic antennas.
  • an antenna array 40 comprises two pairs 42, 44 of metal antennas, a first pair 42, composed of two metal antennas 46, 48 positioned orthogonally, in sequential rotation, and a second pair 44, composed of two metal antennas 50, 52.
  • the two metal antennas 50, 52 of the second pair 44 have different dimensions from the dimensions of the antennas 46, 48 of the first pair 42, and are respectively positioned above the antennas of the first pair.
  • the two metal antennas of the first pair have a resonant element of first length
  • the two metal antennas of the second pair have a resonant element of second length, less than the first length for example to target a lower frequency band dedicated to GNSS such as the L2 or L5 band.
  • the metallic antennas 46, 48, 50, 52 are PIFA antennas, as described in the first embodiment.
  • the antenna array also includes a monopole antenna 54, centered relative to the center of symmetry O of the antenna array 40 and non-resonant.
  • the first pair 42 of antennas is configured to operate in a first frequency band, for example the L1 band
  • the second pair 44 of antennas is configured to operate in a second frequency band , for example the L2 band.
  • the charging circuit (not visible on the figure 6 ) is parameterized to achieve operation of these pairs of antennas in dual frequency band.
  • an antenna array 60 comprises two pairs 62, 64 of metal antennas, a first pair of antennas 62, composed of two metal antennas 66, 68 positioned orthogonally, with sequential rotation, and a second pair of antennas 64, composed of two metal antennas 70, 72, also positioned in sequential rotation at an angle of rotation equal to 90°.
  • the two metal antennas 70, 72 of the second pair 64 have different dimensions from the dimensions of the antennas 66, 68 of the first pair 62, and are respectively positioned according to a translation offset with respect to the antennas 66 , 68 of the first pair 62.
  • the two metal antennas 66, 68 of the first pair 62 have a resonant element of first length
  • the two metal antennas 70, 72 of the second pair 64 have a resonant element of second length, less than the first length for example to target a lower frequency band dedicated to GNSS such as the band L2 or L5.
  • the metallic antennas 66, 68, 70, 72 are PIFA antennas, as described in the first embodiment.
  • the antenna array also includes a monopole antenna 74, centered relative to the center of symmetry O of the antenna array 60, and non-resonant.
  • the charging circuit (not visible on the figure 7 ) is parameterized to achieve operation of these pairs of antennas in dual frequency band.
  • the antenna array 80 comprises two pairs of antennas 82, 84, arranged symmetrically with respect to the point O which is located substantially at the center of the antenna array.
  • the first pair of antennas 82 is composed of two metallic antennas 86, 88 in sequential rotation at an angle of rotation equal to 90°
  • the second pair of antennas 84 is composed of two metallic antennas 90, 92, also positioned in sequential rotation at an angle of rotation equal to 90°.
  • the two pairs of antennas are arranged so that the second pair of antennas is rotated through 180° with respect to the first pair of antennas.
  • the metal antennas 86, 88, 90, 92 are structurally identical, they are for example PIFA antennas.
  • the resulting antenna array 80 is a centrally symmetrical antenna array.
  • the antenna array 80 further comprises a monopole antenna 94.
  • the antenna array 80 is adapted to operate in one or in two frequency bands.
  • the figure 9 schematically illustrates an arrangement of four pairs of antennae in sequential rotation, forming an antenna array structure of circular revolution.
  • This arrangement comprises a first pair of antennae 100, 102, in sequential rotation at an angle equal to 180° around the point O, a second pair of antennae 104, 106, in sequential rotation at an angle equal to 180° around the point O, a third pair of antennae 108, 110, in sequential rotation at an angle equal to 180° around the point O, a fourth pair of antennae 112, 114, in sequential rotation at an angle equal to 180° around the point O.
  • the second pair of antennae is rotated 45° relative to the first pair of antennae
  • the third pair of antennae is rotated 45° relative to the second pair of antennae
  • the fourth pair of antennae is rotated at 45° relative to the third pair of antennae.
  • the antennas 100, 102, 104, 106, 108, 110, 112 and 114 are, for example, metallic PIFA antennas, and their dimensions are chosen to form a substantially circular structure.
  • an antenna array suitable for supplying directional radiation in right circular polarization is formed.
  • the size and shape of the monopole antenna (not represented in the figure 9 ) are chosen in line with the type of radiation sought.
  • the example of the figure 9 has 4 pairs of sequentially rotating antennas. More generally, a greater number N of antenna pairs, for example PIFA metal antennas, is used.
  • the antenna array is composed of metal antennas printed on a dedicated card or PCB (acronym for “Printed Circuit Board”).
  • PCB printed Circuit Board
  • the dimensions of the antenna array are further reduced according to the permittivity or permeability value of the substrate.
  • the invention has been described above according to various embodiments, more particularly with PIFA metal antennas, since the use of such antennas makes it possible to produce a particularly compact antenna array.
  • the various embodiments apply with other types of metal antennas, for example patch antennas, which operate analogously and can be optimized for operation similar to that described above, by setting the load circuit for producing radiation in which the monopole antenna has a destructive contribution from a transverse magnetic radiation mode, making it possible to obtain, by the at least one pair of metallic patch antennas, radiation of chosen circular polarization .
  • an antenna array according to the invention makes it possible to produce directional radiation in circular polarization, with low bulk and low manufacturing cost.

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
EP21213414.2A 2020-12-11 2021-12-09 Antennennetz mit gerichteter strahlung Pending EP4012839A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2013099A FR3117686B1 (fr) 2020-12-11 2020-12-11 Réseau antennaire à rayonnement directif

Publications (1)

Publication Number Publication Date
EP4012839A1 true EP4012839A1 (de) 2022-06-15

Family

ID=74871549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21213414.2A Pending EP4012839A1 (de) 2020-12-11 2021-12-09 Antennennetz mit gerichteter strahlung

Country Status (3)

Country Link
US (1) US12003046B2 (de)
EP (1) EP4012839A1 (de)
FR (1) FR3117686B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
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WO2024109186A1 (zh) * 2022-11-22 2024-05-30 Oppo广东移动通信有限公司 电子设备及其天线切换方法

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US11539119B1 (en) * 2019-07-02 2022-12-27 Hrl Laboratories, Llc Slanted top loaded monopole for VLF generation
US20220302602A1 (en) * 2021-03-16 2022-09-22 TE Connectivity Services Gmbh Circularly polarized antenna assembly
CN115275583B (zh) * 2022-09-23 2023-04-25 盛纬伦(深圳)通信技术有限公司 应用于分米波频段车载通信的宽带多波束天线阵元及阵列

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US6618016B1 (en) * 2001-02-21 2003-09-09 Bae Systems Aerospace Inc. Eight-element anti-jam aircraft GPS antennas
US20060220959A1 (en) * 2003-03-18 2006-10-05 Zhinong Ying Compact diversity antenna
US7450082B1 (en) * 2006-03-31 2008-11-11 Bae Systems Information And Electronics Systems Integration Inc. Small tuned-element GPS antennas for anti-jam adaptive processing
US20180337458A1 (en) * 2017-05-18 2018-11-22 Skyworks Solutions, Inc. Reconfigurable antenna systems with ground tuning pads
EP2840654B1 (de) 2013-08-20 2020-06-17 Commissariat à l'Énergie Atomique et aux Énergies Alternatives Verfahren zu Bestimmung eines Antennennetzes

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US7812783B2 (en) * 2006-12-18 2010-10-12 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Miniaturized orthogonal antenna system
WO2018111690A1 (en) * 2016-12-12 2018-06-21 Skyworks Solutions, Inc. Frequency and polarization reconfigurable antenna systems
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US6618016B1 (en) * 2001-02-21 2003-09-09 Bae Systems Aerospace Inc. Eight-element anti-jam aircraft GPS antennas
US20060220959A1 (en) * 2003-03-18 2006-10-05 Zhinong Ying Compact diversity antenna
US7450082B1 (en) * 2006-03-31 2008-11-11 Bae Systems Information And Electronics Systems Integration Inc. Small tuned-element GPS antennas for anti-jam adaptive processing
EP2840654B1 (de) 2013-08-20 2020-06-17 Commissariat à l'Énergie Atomique et aux Énergies Alternatives Verfahren zu Bestimmung eines Antennennetzes
US20180337458A1 (en) * 2017-05-18 2018-11-22 Skyworks Solutions, Inc. Reconfigurable antenna systems with ground tuning pads

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024109186A1 (zh) * 2022-11-22 2024-05-30 Oppo广东移动通信有限公司 电子设备及其天线切换方法

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Publication number Publication date
FR3117686A1 (fr) 2022-06-17
US12003046B2 (en) 2024-06-04
FR3117686B1 (fr) 2023-11-24
US20220231417A1 (en) 2022-07-21

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