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WO2020239190A1 - Antenne multi-bande avec dispositif sélectif en fréquence pour isolation améliorée d'éléments rayonnants - Google Patents

Antenne multi-bande avec dispositif sélectif en fréquence pour isolation améliorée d'éléments rayonnants Download PDF

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Publication number
WO2020239190A1
WO2020239190A1 PCT/EP2019/063499 EP2019063499W WO2020239190A1 WO 2020239190 A1 WO2020239190 A1 WO 2020239190A1 EP 2019063499 W EP2019063499 W EP 2019063499W WO 2020239190 A1 WO2020239190 A1 WO 2020239190A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
fsd
radiating elements
frequency band
radiating
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.)
Ceased
Application number
PCT/EP2019/063499
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English (en)
Inventor
Muhammad Kamran KHATTAK
Ignacio Gonzalez
Bruno BISCONTINI
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.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
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 Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/EP2019/063499 priority Critical patent/WO2020239190A1/fr
Publication of WO2020239190A1 publication Critical patent/WO2020239190A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • H01Q1/52—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
    • H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
    • 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
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
    • 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
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
    • 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

Definitions

  • the present invention relates to an antenna for mobile communications, in particular to a dual band or a multi-band antenna.
  • the antenna may be configured to radiate in a plurality of frequency bands.
  • Use of a Frequency Selective Device (FSD) gives the antenna an improved isolation between radiating elements associated with at least one of the frequency bands.
  • FSD Frequency Selective Device
  • Ultra-broadband base station antenna systems typically operate in the 690-960 MHz“Low Band” (LB), in the 1.427-2.4 GHz“Middle Band” (MB), in the 1.7-2.7 GHz“High Band” (HB), and in the 3.3-3.7 GHz C-Band (CB) spectrum. These spectra include most cellular network frequency bands that are used today.
  • AAS Active Antenna Systems
  • ultra-compact, ultra-broadband multiple-array base station antennas need to be designed without compromising antenna Key Performance Indicators (KPIs).
  • KPIs Key Performance Indicators
  • Such antennas may comprise multiple arrays of radiating elements, e.g. LB, MB, HB and CB arrays. Reducing the overall geometrical antenna dimensions while maintaining the Radio Frequency (RF) KPIs can be challenging.
  • One challenge lies in minimizing electromagnetic coupling (i.e. in optimizing electromagnetic isolation) between radiating elements (e.g. radiating elements pertaining to a certain frequency band) as the size of the platform decreases.
  • those radiating elements should be electrically invisible to each other.
  • massive Multiple Input Multiple Output (mMIMO) modules where radiating elements for the LB and for the CB are located closely together, there is - without any isolation - a high degree of undesired parasitic coupling between radiating elements.
  • the parasitic coupling can give rise to unwanted resonances.
  • One design makes use of metal walls to isolate radiating elements of the LB and the HB in a multi-band, dual polarized base station antenna. A drawback of this technique is that it can give rise to unwanted resonances and degrade the overall performance of the antenna.
  • split ring resonator (SRR) structures are provided between two planar MIMO antennas, in order to improve an isolation between the two antennas.
  • the SRR structure is planar, cavity backed, and improves the isolation between the MIMO antennas at one specific frequency by trapping surface-waves on the ground.
  • PCB ground printed circuit board
  • metamaterial-mushroom structured SRRs are arranged to improve the isolation between planar dipoles.
  • the SRR rings are planar and cavity-backed. The idea is to trap surface-waves having a certain frequency, and shunt all the currents to the ground PCB by means of a shunt-via inductance.
  • the mushroom type structure involves a significant modification in the ground PCB.
  • FSSs frequency selective surfaces
  • Embodiments of the invention provide antennas, in particular dual-band or multi-band antennas, having an improved performance.
  • the isolation between radiating elements related to at least one frequency band should be significantly enhanced, without impacting the performance of radiating elements related to other frequency bands, and without impacting the overall desired KPIs of the antenna.
  • an isolation between at least the LB radiating elements should be improved, without impacting the performance of the HB and/or CB radiating elements.
  • the isolation scheme used in the antenna should also be relatively broadband, in order to cover the necessary bands.
  • the antenna should also have a geometry that is compact, robust, and can be accommodated easily within the antenna platform.
  • the antenna should not require an altered design or placement of the radiating elements related to the different frequency bands, i.e. when compared to antenna designs without any isolation.
  • embodiments of the invention employ a frequency-selective device (FSD) between radiating elements, which FSD ideally behaves like a metal-wall for a first frequency band, while being transparent for a second frequency band.
  • FSD frequency-selective device
  • a first aspect of the invention provides an antenna, comprising: two or more first radiating elements configured to radiate in a first frequency band, one or more second radiating elements configured to radiate in a second frequency band, and an FSD arranged between a first subset and a second subset of the two or more first radiating elements and configured to at least partially block radiation in the first frequency band and to pass radiation in the second frequency band.
  • the FSD is configured to isolate the first radiating elements from another, without impacting the one or more second radiating elements, or an array of second radiating elements arranged in the vicinity of the first radiating elements.
  • the performance of the antenna is thus improved.
  • the antenna may be compact and robust, and can be accommodated easily within existing antenna platforms.
  • the antenna does also not require any altered design or different placement of the radiating elements compared to an antenna without isolation.
  • Each of the first subset and the second subset may comprise one or more first radiating elements.
  • the FSD is opaque for radiation in the first frequency band.
  • the performance of the antenna is improved in an optimized manner, since the isolation between the first radiating elements is optimized.
  • the FSD is transparent for radiation in the second frequency band.
  • the second frequency band is not affected at all, and the antenna KPIs can be optimally fulfilled.
  • the FSD comprises a metallic structure.
  • the FSD may be implemented without incorporating any cavity-backing material i.e. without substrate material. Production costs can thus be reduced without compromising the performance.
  • the FSD provides a simple and compact structure to achieve the desired isolation between the radiating elements.
  • the FSD is configured to be polarization- independent.
  • the FSD is suitable for a dual-polarized antenna and/or dual-polarized radiating elements.
  • the FSD comprises a SRR, structure, in particular a rectangular SRR structure.
  • This structure provides a simple but effective implementation of the FSD.
  • the FSD comprises a Hilbert-curve structure and/or a spiraled-triangle structure.
  • the FSD comprises an arrangement of a plurality of FSD unit cells.
  • each FSD unit cell can comprise a SRR structure.
  • the FSD is arranged at a determined height above an antenna board that carries the first and the second radiating elements.
  • the first radiating elements each comprise a radiating plane arranged at a determined height above an antenna board that carries the first and the second radiating elements, and the FSD is arranged at the same height as the radiating planes.
  • the FSD is planar and arranged perpendicular to the radiating planes, and/or the FSD comprises a frequency-selective surface arranged perpendicular to the radiating planes.
  • the FSD is not grounded and/or not electrically connected to any other part of the antenna.
  • the two or more first radiating elements are LB radiating elements, and/or the one or more second radiating elements are HB or CB radiating elements.
  • At least one of the one or more second radiating elements is arranged in a vicinity of and/or is co-located with one of the first radiating elements.
  • the first subset of first radiating elements is arranged in a first column
  • the second subset of first radiating elements is arranged in a second column parallel to the first column
  • the FSD is arranged between the first column and the second column,.
  • the FSD extends along and between the first and the second columns.
  • a second aspect of the invention provides a base station comprising an antenna according to the first aspect or any one of its implementation forms, and a radio transmitter connected to the antenna.
  • the base station of the second aspect thus enjoys all advantages and effects of the antenna of the first aspect.
  • FIG. 1 shows an example of an antenna according to an embodiment of the invention.
  • FIG. 2 shows an example of a FSD unit-cell for a FSD of an antenna according to an embodiment of the invention.
  • FIG. 3 shows an example of a FSD for an antenna according to an embodiment of the invention.
  • FIG. 4 shows various FSD unit-cells for a FSD of antenna according to an embodiment of the invention.
  • FIG. 5 shows an example of simulated transmission and reflection coefficients of a FSD unit-cell for a FSD of an antenna according to an embodiment of the invention.
  • FIG. 6 shows simulation results related to an example of a FSD unit-cell, in particular,
  • FIG. 7 shows an example of an antenna according to an embodiment of the invention.
  • FIG. 8 shows an example of an antenna according to an embodiment of the invention.
  • FIG. 1 shows an antenna 100 according to an embodiment of the invention.
  • the antenna 100 may be a dual-band antenna or a multi-band antenna.
  • the antenna 100 may be a base station antenna or included in a BTS.
  • the antenna 100 may be a dual-polarized antenna.
  • the antenna 100 includes two or more first radiating elements 101, which are configured to radiate in a first frequency band, e.g. in the LB.
  • the first radiating elements 101 may be arranged in one or more columns, and may form one or more LB arrays.
  • the antenna 100 includes one or more second radiating elements 102, which are configured to radiate in a second frequency band, e.g. in the HB or CB.
  • the antenna 100 may include multiple second radiating elements 102, e.g. forming an array, e.g. a HB array or CB array.
  • the antenna 100 includes further an FSD 103 arranged between the first radiating elements 101.
  • the FSD 103 is a single structure.
  • the FSD 103 comprises multiple pieces arranged near each other.
  • the FSD 103 is configured to at least partially block radiation in the first frequency band, i.e. radiation generated by the first radiating elements 101, and to pass (at least some) radiation in the second frequency band, i.e. radiation generated by the one or more second radiating elements 102.
  • the presence of the FSD 103 can significantly improve the performance of the antenna 100 shown in FIG. 1 , compared to a hypothetical simpler antenna (not shown) in which the FSD 103 is omitted.
  • the two or more first radiating elements 101 may comprise two or more dual- polarized radiating elements 101 working in the first frequency band.
  • the one or more second radiating elements 102 may comprise two or more further dual-polarized radiating elements
  • the two or more second radiating elements 102 may be located in the vicinity of, may be quasi co-located with, or may be co-located with at least some of the first radiating elements 101.
  • the FSD 103 improves the isolation between the first radiating elements 101 operating in the first frequency band, and improves the radiation- performance of the second radiating element(s) 102 operating in the second frequency band.
  • the FSD 103 may be a rectangular, metallic SRR structure with a frequency stop-band of in the first frequency band and a frequency pass-band of/in the second frequency band. Thus, it works like a frequency selective surface (FSS).
  • the FSD 103 may be a metallic structure without any cavity backing material.
  • the FSD 103 may be polarization- independent, hence it may behave effectively the same for both polarizations of a dual-polarized antenna 100.
  • the FSD 103 may be neither grounded nor electrically connected to any other part of the antenna 100.
  • the FSD 103 may be configured to capture electromagnetic (EM) waves in the nearfield, and not on the surface of the antenna 100.
  • EM electromagnetic
  • FIG. 2 shows an example of a FSD unit-cell structure for the FSD 103, as it can be used for an antenna 100 according to an embodiment of the invention.
  • FIG. 2 shows a unit cell structure of a metallic FSD 103.
  • the unit-cell structure shown in FIG. 2 is implemented as a rectangular double-slot SRR structure 200.
  • the SRR structure 200 may include a PEC-metal 201 and two slots 202 (air cavities).
  • the FSD 103 may generally comprise a SRR structure or even other structures as described below as unit-cells.
  • the rectangular double-slot SRR structure 200 may be the building block for the complete FSD
  • the FSD 103 comprises an arrangement 300 of a plurality of FSD unit-cells realized as rectangular double-slot SRR structures 200 as shown in FIG. 1. Again, these unit-cell structures of the FSD 103 can also be different ones.
  • FIG. 4 shows various possible FSD unit-cell structures for a FSD 103 of an antenna 100 according to an embodiment of the invention.
  • a circular SRR structure 401 e.g. single-slot or double-slot as illustrated
  • a rectangular single slot SRR structure 401 e.g. single-slot or double-slot as illustrated
  • a rectangular single slot SRR structure 401 e.g. single-slot or double-slot as illustrated
  • the rectangular double-slot SRR structure 200 of FIG. 2 with two concentric slots
  • a Hilbert-curve structure 404 or a spiraled-triangle structure 403 can be used.
  • the FSD 103 can comprise one or a plurality of a SRR structures 200, 401 and/or 402, and/or a Hilbert-curve structure 404, and/or a spiraled-triangle structure 403.
  • the FSD 103, or a FSS of the FSD 103 could also be created in many other shapes with different shapes of the unit-cell structure.
  • the working principle of the FSD 103 is simple to understand.
  • the (metallic) unit-cells works as a LC-band pass filter, which stop a certain frequency band at least partially, i.e. the first frequency band, preferably is opaque for the radiation in the first frequency band. Further, it passes at least partially another frequency band, i.e. the second frequency band, preferably is completely transparent for the second frequency band (pass-band).
  • the unit-cells may be optimized to stop the LB, and to have a complete pass band for the CB.
  • FIG. 5 shows the behavior of an exemplary FSD 103 of an antenna 100 according to an embodiment of the invention, when energized in certain boundary conditions. It can be seen that the LB is stopped, and the CB is passed in this example.
  • FIG. 6 shows 3D simulations of the effect of the EM-wave on the FSD 103 (unit-cell). It can be clearly observed in FIG. 6(a) that the FSD 103 behaves opaque for the stop-band, e.g. for the LB, with maximum reflections.
  • FIG. 6(b) shows the pass-band effect i.e. that the FSD 103 behaves as a transparent material for the pass-band, e.g. for the HB or CB.
  • FIG. 7 shows an antenna 100 according to an embodiment of the invention, which builds on the simplified antenna 100 shown in FIG. 1. Same elements in FIG. 1 and FIG. 7 are labelled with the same reference signs and function likewise. That is, also the antenna 100 shown in FIG. 7 includes the two or more first radiating elements 101, the one or more second radiating elements 102, and the FSD 103.
  • the two or more first radiating elements 101 are LB radiating elements. These LB radiating elements 101 are arranged in a first column and in a second column, which is parallel to the first column.
  • the FSD 103 is arranged between the first radiating elements 101 (more specifically, between the first column and the second column).
  • the FSD 103 is exemplarily shown to extend along and between the first and the second columns.
  • the one or more second radiating elements 102 are one or more CB radiating elements in FIG. 7.
  • a plurality of CB radiating elements 102 form an array.
  • the LB radiating elements 101 are placed within this array. That is, second radiating element(s) 102 is/are arranged in the vicinity of or is/are co-located with one or more of the first radiating elements 101.
  • the FSD 103 may be placed in an optimal position between different first radiating elements 101, and between first radiating elements 101 and second radiating elements 102.
  • EM energy can thus be trapped at an optimized position in the zenith-nearfield. This can reduce the EM coupling between the first and the second subset of first radiating elements 101, and thus reducing effects of the coupling on the performance o f the second radiating elements 102.
  • FIG. 7 A possible arrangement of the FSD 103 for this purpose is shown in FIG. 7.
  • the first and the second radiating elements 101 and 102 are arranged on an antenna board 700.
  • the FSD 103 is arranged at a certain height above the antenna board 700.
  • the first radiating elements 101 each comprise a radiating plane 701 that is arranged at a certain height above the antenna board 700
  • the FSD 103 may be arranged at the same height as the radiating planes 701.
  • the FSD 103 may be held by support structures 702 at the mentioned height above the antenna board 700.
  • the FSD 103 may be planar, and may be arranged perpendicular to the radiating planes 701 of the first radiating elements 101.
  • the FSD 103 may also comprise a FSS arranged perpendicular to the radiating planes 701 of the first radiating elements 101.
  • FIG. 8 shows a further possible design of the antenna 100 according to embodiments of the invention, which build on the simplified antenna 100 shown in FIG. 1. Same elements in FIG. 1 and FIG. 8 are again labelled with the same reference signs and function likewise. That is, also the antenna 100 shown in FIG. 8 includes the two or more first radiating elements 101, the one or more second radiating elements 102, and the FSD 103.
  • the FSD 103 is exemplarily a metallic FSD 103 with unit-cells formed by a rectangular dual-slot SRR structure 200 as shown in FIG. 2.
  • the FSD 103 may be installed at an optimized location between the first radiating elements 103, here LB radiating elements, and the second radiating elements 102, here CB radiating elements.
  • the FSD 103 may be arranged and/or held at a determined height above the antenna board 700.
  • the FSD 103 improves the isolation between the LB radiating elements 101, namely by trapping EM-energy in the nearfield.
  • the FSD 103 also improves the cross-polarization in the CB (e.g. MIMO) radiating elements 102, which improves notably the shape of the beam.
  • CB e.g. MIMO
  • the embodiments of the invention, employing the FSD 103 have the following advantages, in particular when provided in BTS antennas:
  • the FSD 103 can be used to trap EM-waves in the zenith rather than trapping the surface- wave on the ground.
  • the FSD 103 does not have to be grounded, but can be arranged in the open space, e.g. orthogonal to the radiating elements 101 or the antenna board 700. This helps to improve the isolation between the first radiating elements 101, e.g. for related to the LB, without changing the spacing between the radiating elements 101, and/or without modifying the ground-plane geometry.
  • Beam-patterns and isolations in the second frequency band are also improved without requiring a change of the antenna design.
  • Performance of the second radiating elements 102 e.g. CB radiating elements, is improved.
  • the FSD 103 may be a metal wall with one or more slots.
  • the FSD 103 may be tunable to a certain extent, as parametrized.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

La présente invention concerne une antenne pour communications mobiles, en particulier une antenne double bande ou multi-bande. L'antenne est configurée pour rayonner dans de multiples bandes de fréquences. A cet effet, l'antenne comprend au moins deux premiers éléments rayonnants configurés pour rayonner dans une première bande de fréquences, et un ou plusieurs seconds éléments rayonnants configurés pour rayonner dans une seconde bande de fréquences. Afin d'améliorer les performances d'antenne, l'antenne comprend en outre un dispositif sélectif en fréquence (FSD) disposé entre un premier et un second sous-ensemble des premiers éléments rayonnants, et configuré pour bloquer au moins partiellement un rayonnement dans la première bande de fréquence et pour laisser passer un rayonnement dans la seconde bande de fréquences.
PCT/EP2019/063499 2019-05-24 2019-05-24 Antenne multi-bande avec dispositif sélectif en fréquence pour isolation améliorée d'éléments rayonnants Ceased WO2020239190A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2019/063499 WO2020239190A1 (fr) 2019-05-24 2019-05-24 Antenne multi-bande avec dispositif sélectif en fréquence pour isolation améliorée d'éléments rayonnants

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2019/063499 WO2020239190A1 (fr) 2019-05-24 2019-05-24 Antenne multi-bande avec dispositif sélectif en fréquence pour isolation améliorée d'éléments rayonnants

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3923411A1 (fr) * 2020-06-10 2021-12-15 CommScope Technologies LLC Antenne de station de base ayant une surface sélective en fréquence
CN114142245A (zh) * 2021-12-15 2022-03-04 中国商用飞机有限责任公司 一种频率选择性透射的金属化面板
EP4053996A1 (fr) * 2021-02-26 2022-09-07 CommScope Technologies LLC Antenne multibande et procédé d'accord d'antenne multibande
WO2023113192A1 (fr) * 2021-12-16 2023-06-22 주식회사 에이스테크놀로지 Antenne de station de base multibande utilisant une surface de blindage sélective

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Publication number Priority date Publication date Assignee Title
US20180248257A1 (en) * 2015-11-25 2018-08-30 Commscope Technologies Llc Phased array antennas having decoupling units
WO2018180766A1 (fr) * 2017-03-31 2018-10-04 日本電気株式会社 Antenne, antenne multibande et dispositif de communication sans fil
US20180331419A1 (en) * 2017-05-12 2018-11-15 Commscope Technologies Llc Base station antennas having parasitic coupling units

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180248257A1 (en) * 2015-11-25 2018-08-30 Commscope Technologies Llc Phased array antennas having decoupling units
WO2018180766A1 (fr) * 2017-03-31 2018-10-04 日本電気株式会社 Antenne, antenne multibande et dispositif de communication sans fil
US20190393597A1 (en) * 2017-03-31 2019-12-26 Nec Corporation Antenna, multiband antenna, and wireless communication device
US20180331419A1 (en) * 2017-05-12 2018-11-15 Commscope Technologies Llc Base station antennas having parasitic coupling units

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3923411A1 (fr) * 2020-06-10 2021-12-15 CommScope Technologies LLC Antenne de station de base ayant une surface sélective en fréquence
US11581636B2 (en) 2020-06-10 2023-02-14 Commscope Technologies Llc Base station antenna with frequency selective surface
EP4053996A1 (fr) * 2021-02-26 2022-09-07 CommScope Technologies LLC Antenne multibande et procédé d'accord d'antenne multibande
US12027772B2 (en) 2021-02-26 2024-07-02 Commscope Technologies Llc Multi-band antenna and method for tuning multi-band antenna
CN114142245A (zh) * 2021-12-15 2022-03-04 中国商用飞机有限责任公司 一种频率选择性透射的金属化面板
WO2023113192A1 (fr) * 2021-12-16 2023-06-22 주식회사 에이스테크놀로지 Antenne de station de base multibande utilisant une surface de blindage sélective

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