WO2025013938A1 - 電磁波反射体 - Google Patents

電磁波反射体 Download PDF

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Publication number
WO2025013938A1
WO2025013938A1 PCT/JP2024/025333 JP2024025333W WO2025013938A1 WO 2025013938 A1 WO2025013938 A1 WO 2025013938A1 JP 2024025333 W JP2024025333 W JP 2024025333W WO 2025013938 A1 WO2025013938 A1 WO 2025013938A1
Authority
WO
WIPO (PCT)
Prior art keywords
closed circuit
electromagnetic wave
wave reflector
wiring
constituting
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
PCT/JP2024/025333
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
智哉 八木田
泰明 井手
博之 野本
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.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical 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 Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP2025505381A priority Critical patent/JPWO2025013938A1/ja
Publication of WO2025013938A1 publication Critical patent/WO2025013938A1/ja
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields

Definitions

  • the present invention relates to an electromagnetic wave reflector that reflects electromagnetic waves in a wavelength range centered on millimeter waves.
  • the fifth-generation mobile communication system uses electromagnetic waves in the high-frequency band, for example, 3 GHz to 300 GHz (hereinafter, for convenience, sometimes referred to as millimeter waves).
  • millimeter waves have high frequency, they tend to travel in a very straight line and are less likely to propagate due to diffraction. It is known that many coverage holes occur due to electromagnetic wave shielding caused by a large number of buildings, particularly in urban areas. For this reason, the use of millimeter waves requires the use of reflected waves (reflected electromagnetic waves), which have not been used in the past. For this reason, electromagnetic wave reflectors capable of reflecting electromagnetic waves in high frequency bands such as millimeter waves are also known.
  • Patent Document 1 discloses a metasurface reflector array that is configured by arranging multiple metasurface reflectors, and in which the phase difference between the reflected radio waves of two adjacent metasurface reflectors is not zero. It is said that by using such a metasurface reflector array, it is possible to control the reflection direction (reflection angle) of radio waves in high frequency bands such as the 28 GHz band, and the direction in which reflection is suppressed.
  • the electromagnetic wave reflector according to the fourth aspect of the present invention is characterized in that in any one of the first to third aspects, the unit element constituting the first closed circuit and the unit element constituting the second closed circuit have wiring with different line widths.
  • the seventh aspect of the present invention relates to an electromagnetic wave reflector, in which in the sixth aspect, the unit elements constituting the first closed circuit are made of a material containing at least one of silicon, platinum, titanium, cobalt, iron, gold, silver, and copper, and the unit elements constituting the second closed circuit are made of a material containing at least one of gold, silver, and copper.
  • the first closed circuit 11 and the second closed circuit 12 are formed in an alternating stripe pattern along one main surface (front surface) of one substrate 13. It is preferable that the first closed circuit 11 and the second closed circuit 12 that are adjacent to each other are formed continuously without any gaps. Note that the first closed circuit 11 and the second closed circuit 12 do not have to be in contact as long as they are adjacent to each other, and for example, the first closed circuit 11 and the second closed circuit 12 may be formed with a constant distance between them.
  • different materials are used for the wiring of each unit element 11C constituting the first closed circuit 11 and the wiring of each unit element 12C constituting the second closed circuit 12, so that the conductivity of the wiring differs between unit elements 11C and 12C, and therefore the first impedance ( ⁇ ) of the first closed circuit 11 and the second impedance ( ⁇ ) of the second closed circuit 12 have different values.
  • the wiring of each unit element 11C constituting the first closed circuit 11 and the wiring of each unit element 12C constituting the second closed circuit 12 are made different from each other in both line width and constituent material, but even if only one of the line width or constituent material is made different, the first impedance ( ⁇ ) of the first closed circuit 11 and the second impedance ( ⁇ ) of the second closed circuit 12 can be made different from each other.
  • the impedance difference between the first impedance ( ⁇ ) of the first closed circuit 11 and the second impedance ( ⁇ ) of the second closed circuit 12 can be made larger.
  • FIG. 3 is an enlarged cross-sectional view of a main portion of the electromagnetic wave reflector of this embodiment.
  • a protective layer 14 is formed so as to cover the wirings E constituting the unit element 11C of the first closed circuit 11 and the unit element 12C of the second closed circuit 12, which are formed on one main surface of the substrate 13.
  • the protective layer 14 is bonded to the unit elements 11C and 12C via an adhesive layer 15.
  • the protective layer 14 and adhesive layer 15 need only be made of a material that is capable of transmitting electromagnetic waves at least in the frequency range that is reflected by the electromagnetic wave reflector 10.
  • the protective layer 14 can be made of a resin film.
  • the adhesive layer 15 is preferably made of a synthetic resin material with a dielectric tangent (tan ⁇ ) of 0.018 or less.
  • the dielectric tangent represents the degree of electrical energy loss within a dielectric, and the greater the dielectric tangent of a material, the greater the electrical energy loss.
  • the second closed circuit 22 is composed of a plurality of unit elements 22C connected together and arranged in a matrix. A lattice-like wiring is formed in each unit element 22C, and this wiring is electrically connected to the lattice-like wiring of adjacent unit elements 22C to form a single second closed circuit 22 as a whole. In this way, the second closed circuit 22 forms a circuit having a second impedance.
  • the electromagnetic wave reflector of the present invention has a simple structure and can reflect highly directional electromagnetic waves, such as millimeter waves used in fifth-generation mobile communication systems, in any direction, making it possible to use the reflected waves. Therefore, it has industrial applicability.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Aerials With Secondary Devices (AREA)
PCT/JP2024/025333 2023-07-13 2024-07-12 電磁波反射体 Pending WO2025013938A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2025505381A JPWO2025013938A1 (https=) 2023-07-13 2024-07-12

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023115196 2023-07-13
JP2023-115196 2023-07-13

Publications (1)

Publication Number Publication Date
WO2025013938A1 true WO2025013938A1 (ja) 2025-01-16

Family

ID=94215920

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/025333 Pending WO2025013938A1 (ja) 2023-07-13 2024-07-12 電磁波反射体

Country Status (3)

Country Link
JP (1) JPWO2025013938A1 (https=)
TW (1) TW202510411A (https=)
WO (1) WO2025013938A1 (https=)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021177514A (ja) * 2020-05-07 2021-11-11 株式会社日立製作所 電磁波遮蔽システム及び電磁波遮蔽材
WO2022163813A1 (ja) * 2021-01-29 2022-08-04 積水化学工業株式会社 構造体、及び建築材料

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021177514A (ja) * 2020-05-07 2021-11-11 株式会社日立製作所 電磁波遮蔽システム及び電磁波遮蔽材
WO2022163813A1 (ja) * 2021-01-29 2022-08-04 積水化学工業株式会社 構造体、及び建築材料

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
XI LEI; HONG WEI; LI GUIHONG: "A Reconfigurable Dual-Band Low-RCS Metasurface Enabled by Graphene", 2021 INTERNATIONAL CONFERENCE ON MICROWAVE AND MILLIMETER WAVE TECHNOLOGY (ICMMT), IEEE, 23 May 2021 (2021-05-23), pages 1 - 3, XP034034669, DOI: 10.1109/ICMMT52847.2021.9618356 *

Also Published As

Publication number Publication date
TW202510411A (zh) 2025-03-01
JPWO2025013938A1 (https=) 2025-01-16

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