WO2024236905A1 - 電波反射板 - Google Patents

電波反射板 Download PDF

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Publication number
WO2024236905A1
WO2024236905A1 PCT/JP2024/011803 JP2024011803W WO2024236905A1 WO 2024236905 A1 WO2024236905 A1 WO 2024236905A1 JP 2024011803 W JP2024011803 W JP 2024011803W WO 2024236905 A1 WO2024236905 A1 WO 2024236905A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
radio wave
wave reflector
liquid crystal
electrodes
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/JP2024/011803
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
和己 松永
真一郎 岡
光隆 沖田
大一 鈴木
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.)
Japan Display Inc
Original Assignee
Japan Display Inc
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 Japan Display Inc filed Critical Japan Display Inc
Priority to JP2025520417A priority Critical patent/JPWO2024236905A1/ja
Publication of WO2024236905A1 publication Critical patent/WO2024236905A1/ja
Priority to US19/363,718 priority patent/US20260045701A1/en
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
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/44—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/148—Reflecting surfaces; Equivalent structures with means for varying the reflecting properties

Definitions

  • One embodiment of the present invention relates to a radio wave reflector.
  • the radio wave reflector described in Patent Document 1 has wiring arranged around it to generate a potential difference between the electrodes of the liquid crystal element and change the dielectric constant of the liquid crystal element.
  • the binder resin may be, in addition to acrylic resin, for example, epoxy-based resin, polyester-based resin, polyurethane-based resin, phenol-based resin, melamine-based resin, rubber-based resin, etc.
  • the sealant 51 may contain a phosphoric acid compound such as an arylsulfonic acid, such as phenylphosphonic acid, phenylphosphonic acid dichloride, an alkylphosphonic acid, such as methylphosphonic acid, ethylphosphonic acid, octylphosphonic acid, propylphosphonic acid, or a polyfunctional phosphonic acid, such as hydroxyethanediphosphonic acid, nitrotrimethylenephosphonic acid.
  • a phosphoric acid compound such as an arylsulfonic acid, such as phenylphosphonic acid, phenylphosphonic acid dichloride, an alkylphosphonic acid, such as methylphosphonic acid, ethylphosphonic acid, octylphosphonic acid, prop
  • the transistor Tr is, for example, a thin film transistor (TFT).
  • TFT thin film transistor
  • the incident wave IW is assumed to be incident perpendicularly to the first substrate 20 and the second substrate 30, from the first substrate 20 side to the second substrate 30 side, i.e., in the -Z direction.
  • the incident wave IW incident at the position of the patch electrode 21a shown in FIG. 2 is assumed to be incident wave IW1
  • the incident wave IW incident at the position of the patch electrode 21b adjacent to the patch electrode 21a is assumed to be IW2.
  • those not reflected by the patch electrodes 21a and 21b travel in the -Z direction through the liquid crystal layer 40.
  • the opposing ground electrodes 31a and 31b are set to have different potentials.
  • the propagation speed of electromagnetic waves in a medium varies depending on the dielectric constant, and the dielectric constant of liquid crystal is proportional to the potential difference, so the propagation speed differs between the incident waves IW2-1 and IW2-2 traveling through the liquid crystal layer 40.
  • the incident waves IW2-1 and IW2-2 are reflected by the ground electrodes 31a and 31b, and the reflected reflected waves RW1-1 and RW1-2 each travel in the +Z direction through the liquid crystal layer 40.
  • the propagation speed differs between the reflected waves RW1-1 and RW1-2 traveling through the liquid crystal layer 40.
  • the positions of the wavefronts of the same phase of the reflected waves RW1-1 and RW1-2 that travel through the liquid crystal layer 40 and return to the patch electrodes 21a and 21b differ due to the difference in propagation speed.
  • reflected wave RW1-1 is ahead of reflected wave RW1-2.
  • the patch electrodes 21 and ground electrodes 31 are arranged in a grid pattern in the X and Y directions, so that the direction of the reflected wave RW can be tilted in the desired direction in the Y direction by applying different voltages between adjacent ground electrodes 31 in the Y direction.
  • the incident wave IW incident on the peripheral area EA of the radio wave reflector 1 according to this embodiment shown in FIG. 8 is absorbed by the sealing material 51 that covers the wiring EM, making it difficult for unintended reflected waves to occur. For this reason, unintended reflected waves are unlikely to have effects such as attenuating the phase-adjusted reflected wave RW, disrupting the phase of the reflected wave RW, or interfering with the reflected wave RW.
  • a radio wave reflector 2 according to another embodiment of the present invention has a notch provided in a part of the sealant surrounding the liquid crystal layer 40. The following mainly describes the differences from the radio wave reflector 1 according to the first embodiment.
  • FIG. 9 shows an arrow view of the radio wave reflector 2 cut along a plane parallel to the same XY plane as FIG. 4.
  • a notch 52C is provided in the sealing material 52.
  • the notch 52C is formed to a size that prevents the liquid crystal of the liquid crystal layer 40 from leaking out, for example, 5 mm to 10 mm.
  • the shape, size, number, etc. of the notch 52C are not limited to those described above, and may be modified in various ways as long as the liquid crystal contained in the sealed liquid crystal layer 40 does not leak out.
  • the sealing material 53 of this embodiment does not contain a conductive material. If the sealing material 53 contains a conductive material, it is desirable to coat the surfaces of the bias signal line 32, the selection signal line 33, the electrodes of the connector 61, and the circuit elements 62 with an insulating paint.
  • the circuit elements 62 on the second substrate 30 generate electromagnetic waves, which are noise.
  • the radio wave reflector 3 the bias signal line 32, selection signal line 33, connector 61, and circuit elements 62 on the second substrate 30, which are the noise sources, are covered with a sealing material 52, which is a resin containing magnetic powder. Therefore, with the radio wave reflector 3, the phase of the reflected wave RW (see Figure 1) is less likely to be disturbed.
  • the sealing material 53 may contain substances that have properties such as moisture resistance, waterproofness, light resistance, and dust resistance.
  • the radio wave reflecting plate 4 according to the modified example is provided with a bank 52B for stabilizing the shape of the sealing material.
  • the following mainly describes the differences from the radio wave reflecting plate 1 according to the first embodiment.
  • a bank 52B is provided in the peripheral area EA, preferably near the boundary between the peripheral area EA and the active area AA.
  • the bank 52B has a surface that extends perpendicularly to the second substrate 30, and is formed in the shape of a wall that surrounds the liquid crystal layer 40.
  • the sealant 51 When the sealant 51 is filled, it comes into contact with the outer surface of the bank 52B, and the bank 52B prevents the sealant 51 from entering the active area AA. Therefore, with the radio wave reflector 4, the sealant 51 can be filled to a position closer to the boundary between the peripheral area EA and the active area AA than in the case where the bank 52B is not present. Note that since it is sufficient for the bank 52B to prevent the sealant 51 from entering the active area AA, a portion of the bank 52B may be disposed in the active area AA.
  • radio wave reflector As an example, but the scope of application of the present invention is not limited to radio wave reflectors.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Liquid Crystal (AREA)
  • Aerials With Secondary Devices (AREA)
PCT/JP2024/011803 2023-05-15 2024-03-26 電波反射板 Ceased WO2024236905A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2025520417A JPWO2024236905A1 (https=) 2023-05-15 2024-03-26
US19/363,718 US20260045701A1 (en) 2023-05-15 2025-10-21 Intelligent reflecting surface

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023-080200 2023-05-15
JP2023080200 2023-05-15

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US19/363,718 Continuation US20260045701A1 (en) 2023-05-15 2025-10-21 Intelligent reflecting surface

Publications (1)

Publication Number Publication Date
WO2024236905A1 true WO2024236905A1 (ja) 2024-11-21

Family

ID=93519395

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/011803 Ceased WO2024236905A1 (ja) 2023-05-15 2024-03-26 電波反射板

Country Status (3)

Country Link
US (1) US20260045701A1 (https=)
JP (1) JPWO2024236905A1 (https=)
WO (1) WO2024236905A1 (https=)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001358493A (ja) * 2000-04-10 2001-12-26 Hitachi Ltd 電磁波吸収材とその製造法及びそれを用いた各種用途
JP2006203220A (ja) * 2001-07-16 2006-08-03 Semiconductor Energy Lab Co Ltd 剥離方法
JP2008005461A (ja) * 2006-05-24 2008-01-10 Sharp Corp 衛星信号用コンバータ、アンテナ装置および衛星放送受信装置
US20180109002A1 (en) * 2016-10-18 2018-04-19 Senglee Foo Liquid-crystal reconfigurable metasurface reflector antenna
WO2022259790A1 (ja) * 2021-06-09 2022-12-15 株式会社ジャパンディスプレイ 電波反射板

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001358493A (ja) * 2000-04-10 2001-12-26 Hitachi Ltd 電磁波吸収材とその製造法及びそれを用いた各種用途
JP2006203220A (ja) * 2001-07-16 2006-08-03 Semiconductor Energy Lab Co Ltd 剥離方法
JP2008005461A (ja) * 2006-05-24 2008-01-10 Sharp Corp 衛星信号用コンバータ、アンテナ装置および衛星放送受信装置
US20180109002A1 (en) * 2016-10-18 2018-04-19 Senglee Foo Liquid-crystal reconfigurable metasurface reflector antenna
WO2022259790A1 (ja) * 2021-06-09 2022-12-15 株式会社ジャパンディスプレイ 電波反射板

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JPWO2024236905A1 (https=) 2024-11-21
US20260045701A1 (en) 2026-02-12

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