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EP-4568017-B1 - REFLECTION DEVICE AND SYSTEM

EP4568017B1EP 4568017 B1EP4568017 B1EP 4568017B1EP-4568017-B1

Inventors

  • LIN HOYU
  • KUSE Ryuji
  • FUKUSAKO TAKESHI

Dates

Publication Date
20260506
Application Date
20230816

Claims (11)

  1. A reflection apparatus (30) which reflects a radio wave, comprising a first device and a second device which are provided along an emission direction of a reflected wave, wherein the first device includes a plurality of first units (311) each including a first base body (211) which has a first surface (101) and a second surface (102) provided along the emission direction of the reflected wave, a first element (111, 112, 113, 114) which is provided on the first surface (101), and a second element (121) which is provided on the second surface (102) to be shifted in position from the first element (111, 112, 113, 114) in the emission direction of the reflected wave, the second device includes a plurality of second units (321) each including a second base body (221) which has a third surface (103) and a fourth surface (104) provided along the emission direction of the reflected wave, a third element (131) which is provided on the third surface (103), and a fourth element (141) which is provided on the fourth surface (104), and the first device is provided separated from the second device, and a relative positional relationship between the first device and the second device in a direction along the second surface (102) is adjustable, wherein the first element (111, 112, 113, 114), the second element (121), the third element (131) and the fourth element (141) are conductors, the second element (121) is provided at a position shifted from the first element (111, 112, 113, 114), so that the first element (111, 112, 113, 114) and the second element (121) are provided such that a region where the second element (121) does not overlap the first element (111, 112, 113, 114) exists and/or a region where the first element (111, 112, 113, 114) does not overlap the second element (121) exists when viewed in a direction orthogonal to the first surface, and the second surface (102) and the second element (121) are surfaces that face at least a part of the third surface (103) and the third element (131).
  2. The reflection apparatus (30) according to claim 1, wherein a phase of the reflected wave is determined by surface areas of the first element (111, 112, 113, 114) and the second element (121), a relative positional relationship between the first element (111, 112, 113, 114) and the second element (121), a thickness of the first base body (211), surface areas of the third element (131) and the fourth element (141), and a thickness of the second base body (221).
  3. The reflection apparatus (30) according to claim 1 or 2, wherein the plurality of first units (311) and the plurality of second units (321) are provided at a plurality of positions along a specific direction along the first surface (101), such that phases of the reflected wave are different from each other.
  4. The reflection apparatus (30) according to any one of claims 1 to 3, wherein the plurality of first units (311) and the plurality of second units (321) are provided such that the reflected wave propagates in a specific direction.
  5. The reflection apparatus (30) according to any one of claims 1 to 4, further comprising an adjustment apparatus (34) configured to adjust a relative positional relationship between the first device and the second device.
  6. The reflection apparatus (30) according to any one of claims 1 to 5, wherein a length of one side of each of the plurality of first units (311) is 0.3λ or more and 0.6λ or less where λ is a wavelength of a radio wave incident on the reflection apparatus (30).
  7. The reflection apparatus (30) according to any one of claims 1 to 6, wherein the first element (111, 112, 113, 114), the second element (121), and the third element (131) each have a polygonal shape or a shape curved at least in part.
  8. The reflection apparatus (30) according to any one of claims 1 to 7, wherein the first element (111, 112, 113, 114) is configured to transmit a specific linearly polarized wave or a specific circularly polarized wave.
  9. The reflection apparatus (30) according to any one of claims 1 to 8, wherein the first base body (211) and the second base body (221) each have a polygonal shape or a shape curved at least in part.
  10. The reflection apparatus (30) according to any one of claims 1 to 9, wherein the first element (111, 112, 113, 114) and the third element (131) are conductors having a frequency selective surface, FSS.
  11. A system (10) comprising: the reflection apparatus (30) according to any one of claims 1 to 10; and a radio wave radiation apparatus configured to radiate a radio wave incident on the reflection apparatus (30).

Description

BACKGROUND 1. TECHNICAL FIELD The present invention relates to a reflection apparatus and a system. 2. RELATED ART In Japanese Patent Application Publication No. 2015-46821, a reflector array in which a large number of elements as small as a wavelength are arranged in a planar shape is described as a reflector that reflects radio waves. The document KUSE RYUJI ET AL: "Variable reflection angle meta-surface for orthogonally polarized waves", 2015 IEEE 4TH ASIA-PACIFIC CONFERENCE ON ANTENNAS AND PROPAGATION (APCAP), IEEE, 30 June 2015 (2015-06-30), pages 191-192, XP032844578, DOI: 10.1109/APCAP.2015.7374329, proposes a variable reflection angle meta-surface using double layered FSS (Frequency Selective Surface) for orthogonally polarized waves which can change the scattering pattern easily by shifting one layer. The reflection angle within range of about -20 deg. to -5 deg. is obtained in case of orthogonally polarized waves. WO 01/69719 A2 describes a radio frequency aperture comprising a plurality of insulating layers disposed in a stack, each layer including an array of conductive regions, the conductive regions being spaced from adjacent conductive regions. Also disclosed is method of bending or steering radio frequency waves impinging an antenna. The method includes disposing a plurality of insulating layers arranged in a stack between a source of the radio frequency waves and the antenna, wherein each insulating layer includes an array of conductive regions, the conductive regions being spaced from adjacent conductive regions and forming capacitive elements. The capacitance of the capacitive elements in the plurality of insulating layers is adjusted as a function of their location in the plurality of insulating layers. From US 6 483 480 B1 a uneable impedance surface for steering and/or focusing a radio frequency beam is known. The tunable surface comprises a ground plane; a first plurality of elements disposed in an array a first distance from the ground plane, the distance being less than a wavelength of the radio frequency beam; and a second plurality of elements disposed in an array a second distance from the ground plane, the second plurality of elements be moveable relative to the first plurality of elements. According to GB 2 253 519 A, a reconfigurable frequency selective surface comprises at least two arrays of elements, the arrays being arranged in close proximity with one another so that elements of a first array are closely coupled with elements of a second array adjacent to the first array. The first array is displaceable with respect to the second array to adjust the frequency response of the surface. The displacement may be of translation or rotation. Reference is also made to varying the refractive index of the separating dielectric medium. General Disclosure The invention is defined by claim 1. Embodiments of the invention are defined in the dependent claims. According to an embodiment of the present invention, a reflection apparatus is provided. The reflection apparatus reflects a radio wave. The reflection apparatus includes a first device and a second device which are provided along an emission direction of a reflected wave. The first device includes a plurality of first units each including a first base body which has a first surface and a second surface provided along the emission direction of the reflected wave, a first element which is provided on the first surface, and a second element which is provided on the second surface to be shifted in position from the first element in the emission direction of the reflected wave. The second device includes a plurality of second units each including a second base body which has a third surface and a fourth surface provided along the emission direction of the reflected wave, a third element which is provided on the third surface, and a fourth element which is provided on the fourth surface. The first device is provided separated from the second device, and a relative positional relationship between the first device and the second device in a direction along the second surface is The first element, the second element, the third element and the fourth element are conductors. The second element is provided at a position shifted from the first element, so that the first element and the second element are provided such that a region where the second element does not overlap the first element exists and/or a region where the first element does not overlap the second element exists when viewed in a direction orthogonal to the first surface, the second surface and the second element are surfaces that face at least a part of the third surface and the third element. adjustable. In the reflection apparatus, a phase of the reflected wave may be determined by surface areas of the first element and the second element, a relative positional relationship between the first element and the second element, a thickness of the first base body, surface areas of