Antenna device with endfire directivity

Abstract

To provide an antenna device having low profile and end-fire directivity while using a metasurface structure.SOLUTION: An antenna device 10 has a metasurface structure 15 in which a plurality of conductor elements 200 are arranged on one plane of the dielectric substrate 20, and an antenna excitation element 100 that is provided within a predetermined distance separated from the plane. The plurality of conductor elements 200 are arranged symmetrically with respect to the antenna excitation element 100 in the plan view of the dielectric substrate 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an antenna device using a metasurface structure that can be installed on an indoor ceiling or the like. [Background technology]

[0002] Conventionally, antenna devices for wireless base stations that are installed on indoor ceilings and the like are required to have the ability to radiate radio waves in a direction parallel to the ceiling (endfire directivity) while keeping the vertical size small.

[0003] In addition, metasurface reflectors have been proposed in recent years that use periodic structures to arbitrarily set the direction of reflection of radio waves (for example, Patent Document 1). [Prior art documents] [Non-patent literature]

[0004] [Patent Document 1] Patent Publication No. 2021-048465 Summary of the Invention [Problem to be solved by the invention]

[0005] With the metasurface structure described above, the reflection direction of radio waves can be set arbitrarily, but it is not easy to ensure end-fire directivity while keeping the size in the vertical and circumferential directions small.

[0006] Specifically, in a typical indoor antenna device, a metal reflector is installed on the ceiling side to reduce the effects of radiation from the ceiling. However, with this type of structure, it is necessary to ensure a sufficient distance from the metal reflector to the antenna, making it difficult to realize an antenna device that is small in size in the vertical direction, i.e., has a low profile.

[0007] Therefore, the following disclosure has been made in consideration of this situation, and aims to provide an antenna device that uses a metasurface structure, has a low profile, and has end-fire directivity. [Means for solving the problem]

[0008] One aspect of the present disclosure is an antenna device (e.g., antenna device 10) comprising a metasurface structure (metasurface structure 15) in which a plurality of conductor elements (e.g., conductor element 200) are arranged on one plane of a dielectric substrate (e.g., dielectric substrate 20), and an antenna excitation element (antenna excitation element 100) arranged within a predetermined distance from the plane, wherein the plurality of conductor elements are arranged symmetrically with respect to the antenna excitation element in a planar view of the dielectric substrate. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1(a) is a plan view of the antenna device 10, and FIG. 1(b) is a side view of the antenna device 10. As shown in FIG. [Figure 2] 2(a) and 2(b) are diagrams showing the relationship between the radiation direction and the gain in the radiation direction and the gain in the endfire direction (θ=90 degrees) for the element length l1 of the antenna device 10. FIG. [Figure 3] FIG. 3 is a diagram showing the radiation directivity (zx plane) of the antenna device 10 at the design frequency f0, and the radiation directivity (zx plane) of an antenna with a conventional structure at the design frequency f0. [Figure 4] FIG. 4(a) is a plan view of the antenna device 10A, and FIG. 4(b) is a side view of the antenna device 10A. [Figure 5] 5(a) and 5(b) are diagrams showing the relationship between the radiation direction and the gain in the radiation direction and the gain in the endfire direction (θ=90 degrees) for the element length l2 of the antenna device 10A. [Figure 6] FIG. 6 is a diagram showing the radiation directivity (zx plane) of the antenna device 10A at the design frequency f0, and the radiation directivity (zx plane) of an antenna of a conventional structure at the design frequency f0. [Figure 7] FIG. 7 is a plan view of the antenna device 10B. [Figure 8] 8(a) and 8(b) are diagrams showing the relationship between the radiation direction, the gain in the radiation direction, and the gain in the endfire direction (θ=90 degrees) for the element length l3 of the antenna device 10B. [Figure 9] FIG. 9 is a diagram showing the radiation directivity (zx plane) of the antenna device 10B at the design frequency f0, and the radiation directivity (zx plane) of an antenna of a conventional structure at the design frequency f0. [Figure 10] FIG. 10 is a plan view of the antenna device 10C. [Figure 11] 11(a) and 11(b) are diagrams showing the relationship between the radiation direction, the gain in the radiation direction, and the gain in the endfire direction (θ=90 degrees) for the element length l4 of the antenna device 10C. [Figure 12] FIG. 12 is a diagram showing the radiation directivity (zx plane) of the antenna device 10C at the design frequency f0, and the radiation directivity (zx plane) of an antenna of a conventional structure at the design frequency f0. [Figure 13] FIG. 13 is a plan view of the antenna device 10D. [Figure 14] FIG. 14 is a diagram showing the relationship between the radiation direction, the gain in the radiation direction, and the gain in the endfire direction (θ=90 degrees) for the element length l5 of the antenna device 10D. [Figure 15] FIG. 15 is a diagram showing the radiation directivity (zx plane) of the antenna device 10D at the design frequency f0, and the radiation directivity (zx plane) of an antenna of a conventional structure at the design frequency f0. [Figure 16] FIG. 16 is a plan view of the antenna device 10E. [Figure 17] 17(a) and 17(b) are diagrams showing the relationship between the radiation direction, the gain in the radiation direction, and the gain in the endfire direction (θ=90 degrees) for the element length 16 of the antenna device 10E. [Figure 18]FIG. 18 is a diagram showing the radiation directivity (zx plane) of the antenna device 10E at the design frequency f0, and the radiation directivity (zx plane) of an antenna of a conventional structure at the design frequency f0. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and descriptions thereof will be omitted as appropriate.

[0011] [First embodiment] (1) Antenna device configuration FIG. 1(a) is a plan view of the antenna device 10, and FIG. 1(b) is a side view of the antenna device 10. As shown in FIG.

[0012] As shown in FIGS. 1( a ) and 1 ( b ), the antenna device 10 includes a metasurface structure 15 and an antenna excitation element 100 .

[0013] The metasurface structure 15 is composed of a dielectric substrate 20, a conductor plate 30, and a plurality of conductor elements 200. Note that the conductor plate 30 (which may also be called a ground plate or a metal reflector) is not necessarily required. Depending on the installation location of the antenna device 10, the conductor plate 30 may not be provided.

[0014] The antenna device 10 can be suitably installed on an indoor ceiling or the like. The antenna device 10 is characterized by its small size in the vertical direction (z-axis direction) and low profile. The dielectric substrate 20 side may be placed on the ceiling surface.

[0015] In the metasurface structure 15, a plurality of conductive elements 200 are arranged on one plane of the dielectric substrate 20. Specifically, in the metasurface structure 15, one unit composed of two conductive elements 200 so as to radiate in both end-fire directions is arranged symmetrically with respect to the antenna excitation element 100, specifically, so as to be axisymmetric with respect to the antenna excitation element 100.

[0016] In this embodiment, the conductor element 200 has a rectangular shape in a plan view (xy plane) of the dielectric substrate 20. Specifically, the conductor element 200 has a rectangular shape in which the y-axis direction is longer than the x-axis direction in the xy plane. The longitudinal direction of the conductor element 200 is arranged parallel to the longitudinal direction of the antenna excitation element 100.

[0017] In this embodiment, the antenna excitation element 100 is a dipole antenna having two elements, and the arrow in the figure indicates a feeding point. The multiple conductor elements 200 are arranged symmetrically with respect to each element of the dipole antenna in a plan view of the dielectric substrate 20. Specifically, one unit formed by two conductor elements 200 is arranged symmetrically with respect to the element, specifically, line-symmetrically with respect to the element.

[0018] The dielectric substrate 20 has a length l = 0.53λ, a width w = 0.53λ, a height h = 0.06λ, and a relative dielectric constant ε r = 6.5. The conductive plate 30 may be the same size as the dielectric substrate 20. The conductive plate 30 is disposed on the plane of the dielectric substrate 20 opposite the antenna excitation element 100.

[0019] The conductive elements 200 have l1=0.174λ and w1=0.08λ. The spacing between the conductive elements 200 (x-axis direction and y-axis direction, center-based) is 0.27λ (same below). In this embodiment, the corresponding frequency (design frequency f0) of the antenna device 10 is 28 GHz (same below).

[0020] The antenna excitation element 100 is provided at a distance from one plane of the dielectric substrate 20. Specifically, the antenna excitation element 100 is provided within a predetermined distance from the one plane of the dielectric substrate 20. The predetermined distance may be defined based on the wavelength λ that the antenna device 10 supports.

[0021] There is no particular limitation on the method for providing the antenna excitation element 100 at a distance from the dielectric substrate 20. For example, the antenna excitation element 100 may be provided within a predetermined distance from one plane of the dielectric substrate 20 by a support (bracket) extending from the dielectric substrate 20 or a support (bracket) extending from a case (not shown).

[0022] The plurality of conductive elements 200 are arranged symmetrically with respect to the antenna excitation element 100 in a plan view of the dielectric substrate 20. Specifically, the antenna excitation element 100 may be arranged approximately at the center of the dielectric substrate 20 in the x-axis direction. However, as long as the plurality of conductive elements 200 can be arranged symmetrically with respect to the antenna excitation element 100, the antenna excitation element 100 does not necessarily have to be arranged approximately at the center of the dielectric substrate 20 in the x-axis direction.

[0023] The antenna excitation element 100 has a length l a = 0.45λ, width w a = 0.1λ. The antenna excitation element 100 is provided at a height h1 = λ / 4 (= 0.25λ) from the surface of the metasurface structure 15. In other words, the distance from (the surface of) the dielectric substrate 20 to the antenna excitation element 100 may be set to ¼ of the wavelength λ that the antenna device 10 supports.

[0024] (2) Antenna device performance 2(a) and 2(b) show the relationship between the radiation direction and the gain in the radiation direction and the gain in the endfire direction (θ=90 degrees) for the element length l1 of the antenna device 10.

[0025] 2(a) and 2(b), the gain in the endfire direction (near θ=90 degrees) is maximized to 2.78 dBi when l1=0.174λ, where the width direction (x-axis) of the dielectric substrate 20 corresponds to 90 degrees and 270 degrees (same below).

[0026] 3 shows the radiation directivity (zx plane) at the design frequency f0 of the antenna device 10 and the radiation directivity (zx plane) at the design frequency f0 of an antenna with a conventional structure. The conventional structure is a structure that uses a metal reflector instead of the metasurface structure 15 (same below).

[0027] In the case of antennas with conventional structures, the radiation direction of the main lobe is the z-axis direction, but in antenna device 10, radiation is strong in the endfire direction (θ=90 degrees), which is the x-axis direction, and the horizontal gain is improved by approximately 4 dB compared to antennas with conventional structures.

[0028] [Second embodiment] (1) Antenna device configuration Fig. 4(a) is a plan view of the antenna device 10A, and Fig. 4(b) is a side view of the antenna device 10A. Below, differences from the antenna device 10 according to the first embodiment will be mainly described (same below).

[0029] The dielectric substrate 20A of the antenna device 10A has a length l = 0.53λ, a width w = 1.1λ, a height h = 0.06λ, and a relative dielectric constant ε r = 6.5. The dielectric substrate 20A has a larger size (width) in the x-axis direction than the dielectric substrate 20.

[0030] On the dielectric substrate 20A, a unit (which may be called unit 1) formed of two conductor elements 210 is arranged symmetrically with respect to the antenna excitation element 100 (element of a dipole antenna).

[0031] Furthermore, outside (in the x-axis direction) the unit formed by the conductor element 210, a unit (which may be called unit 2) formed by two conductor elements 220 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0032] Conductive element 210 has l1 = 0.174λ and w1 = 0.08λ. Conductive element 210 is the same size as conductive element 200. Conductive element 220 has l2 = 0.175λ and w2 = 0.08λ.

[0033] Thus, in the antenna device 10A, the plurality of conductor elements 210 and conductor elements 220 have different lengths in an orthogonal direction (x-axis direction) perpendicular to the longitudinal direction (y-axis direction) of the antenna excitation element 100 in a plan view of the dielectric substrate 20A. In the antenna device 10A, two rectangular conductor element units (units 1 and 2) with different lengths are arranged symmetrically with respect to the antenna excitation element 100, thereby achieving higher end-fire directivity.

[0034] (2) Antenna device performance 5(a) and 5(b) show the relationship between the radiation direction and the gain in the radiation direction and the gain in the endfire direction (θ=90 degrees) for the element length l2 of the antenna device 10A.

[0035] As shown in Figures 5(a) and 5(b), when l2 = 0.175λ, the gain in the endfire direction (near θ = 90 degrees) is maximized to 5.73 dBi.

[0036] FIG. 6 shows the radiation directivity (zx plane) of the antenna device 10A at the design frequency f0, and the radiation directivity (zx plane) of an antenna of a conventional structure at the design frequency f0.

[0037] In the case of antennas with conventional structures, the radiation direction of the main lobe is the z-axis direction, but in antenna device 10A, radiation is strong in the endfire direction (θ = 90 degrees), which is the x-axis direction, and the horizontal gain is improved by approximately 10 dB compared to antennas with conventional structures.

[0038] [Third embodiment] (1) Antenna device configuration 7 is a plan view of the antenna device 10B. Although side views are omitted below, similar to the antenna device 10A according to the second embodiment, the antenna excitation element 100 is provided apart from one plane of the dielectric substrate 20B.

[0039] The dielectric substrate 20B of the antenna device 10B has a length l = 0.53λ, a width w = 1.6λ, a height h = 0.06λ, and a relative dielectric constant ε r = 6.5 The size (width) of the dielectric substrate 20B in the x-axis direction is larger than that of the dielectric substrate 20A.

[0040] On the dielectric substrate 20B, a unit (which may be called unit 1) formed of two conductor elements 210 is arranged symmetrically with respect to the antenna excitation element 100 (dipole antenna element).

[0041] Outside (in the x-axis direction) of the unit formed by the conductor element 210, a unit (which may be called unit 2) formed by two conductor elements 220 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0042] Furthermore, outside (in the x-axis direction) the unit formed by the conductor element 220, a unit (which may be called unit 3) formed by two conductor elements 230 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0043] Conductive element 210 has l1 = 0.174λ and w1 = 0.08λ. Conductive element 220 has l2 = 0.175λ and w2 = 0.08λ. Conductive element 230 has l3 = 0.177λ and w3 = 0.08λ.

[0044] (2) Antenna device performance 8(a) and 8(b) show the relationship between the radiation direction and the gain in the radiation direction and the gain in the endfire direction (θ=90 degrees) for the element length l3 of the antenna device 10B.

[0045] As shown in Figures 8(a) and 8(b), when l3 = 0.177λ, the gain in the endfire direction (near θ = 90 degrees) is maximized to 3.35 dBi.

[0046] FIG. 9 shows the radiation directivity (zx plane) of the antenna device 10B at the design frequency f0, and the radiation directivity (zx plane) of an antenna of a conventional structure at the design frequency f0.

[0047] In the case of antennas with conventional structures, the radiation direction of the main lobe is the z-axis direction, but in antenna device 10B, radiation is strong in the endfire direction (θ=90 degrees), which is the x-axis direction, and the horizontal gain is improved by approximately 7 dB compared to antennas with conventional structures.

[0048] [Fourth embodiment] (1) Antenna device configuration 10 is a plan view of the antenna device 10C. The dielectric substrate 20C of the antenna device 10C has a length l = 0.53λ, a width w = 2.13λ, a height h = 0.06λ, and a relative dielectric constant ε r = 6.5 The size (width) of the dielectric substrate 20C in the x-axis direction is larger than that of the dielectric substrate 20B.

[0049] On the dielectric substrate 20C, a unit (which may be called unit 1) formed of two conductor elements 210 is arranged symmetrically with respect to the antenna excitation element 100 (dipole antenna element).

[0050] Outside (in the x-axis direction) of the unit formed by the conductor element 210, a unit (which may be called unit 2) formed by two conductor elements 220 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0051] Outside (in the x-axis direction) of the unit formed by the conductor element 220, a unit (which may be called unit 3) formed by two conductor elements 230 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0052] Furthermore, outside (in the x-axis direction) the unit formed by the conductor element 230, a unit (which may be called unit 4) formed by two conductor elements 240 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0053] Conductive element 210 has l1 = 0.174λ and w1 = 0.08λ. Conductive element 220 has l2 = 0.175λ and w2 = 0.08λ. Conductive element 230 has l3 = 0.177λ and w3 = 0.08λ. Conductive element 240 has l4 = 0.174λ and w4 = 0.08λ.

[0054] In the antenna device 10C, the plurality of conductor elements 210, 220, and 230 have different lengths in an orthogonal direction (x-axis direction) perpendicular to the longitudinal direction (y-axis direction) of the antenna excitation element 100 in a plan view of the dielectric substrate 20C. On the other hand, the conductor element 240 has the same size as the conductor element 210. In other words, it is sufficient that at least some of the plurality of conductor elements have different lengths in the orthogonal direction perpendicular to the longitudinal direction of the antenna excitation element 100 in a plan view of the dielectric substrate 20C.

[0055] (2) Antenna device performance 11(a) and 11(b) show the relationship between the radiation direction and the gain in the radiation direction and the gain in the endfire direction (θ=90 degrees) for the element length l4 of the antenna device 10C.

[0056] As shown in Figures 11(a) and 11(b), when l4 = 0.174λ, the gain in the endfire direction (near θ = 90 degrees) is maximized to 6.77 dBi.

[0057] FIG. 12 shows the radiation directivity (zx plane) of the antenna device 10C at the design frequency f0, and the radiation directivity (zx plane) of an antenna of a conventional structure at the design frequency f0.

[0058] In the case of antennas with conventional structures, the radiation direction of the main lobe is the z-axis direction, but in antenna device 10C, radiation is strong in the endfire direction (θ = 90 degrees), which is the x-axis direction, and the horizontal gain is improved by approximately 8 dB compared to antennas with conventional structures.

[0059] [Fifth embodiment] (1) Antenna device configuration 13 is a plan view of the antenna device 10D. The dielectric substrate 20D of the antenna device 10D has a length l = 0.53λ, a width w = 2.66λ, a height h = 0.06λ, and a relative dielectric constant ε r = 6.5 The size (width) of the dielectric substrate 20D in the x-axis direction is larger than that of the dielectric substrate 20C.

[0060] On the dielectric substrate 20D, a unit (which may be called unit 1) formed of two conductor elements 210 is arranged symmetrically with respect to the antenna excitation element 100 (element of a dipole antenna).

[0061] Outside (in the x-axis direction) of the unit formed by the conductor element 210, a unit (which may be called unit 2) formed by two conductor elements 220 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0062] Outside (in the x-axis direction) of the unit formed by the conductor element 220, a unit (which may be called unit 3) formed by two conductor elements 230 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0063] Outside (in the x-axis direction) of the unit formed by the conductor element 230, a unit (which may be called unit 4) formed by two conductor elements 240 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0064] Furthermore, outside (in the x-axis direction) the unit formed by the conductor element 240, a unit (which may be called unit 5) formed by two conductor elements 250 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0065] Conductive element 210 has l1 = 0.174λ and w1 = 0.08λ. Conductive element 220 has l2 = 0.175λ and w2 = 0.08λ. Conductive element 230 has l3 = 0.177λ and w3 = 0.08λ. Conductive element 240 has l4 = 0.174λ and w4 = 0.08λ. Conductive element 250 has l5 = 0.093λ and w5 = 0.08λ.

[0066] (2) Antenna device performance FIG. 14 shows the relationship between the radiation direction, the gain in the radiation direction, and the gain in the endfire direction (θ=90 degrees) for the element length l5 of the antenna device 10D.

[0067] As shown in FIG. 14, when l5=0.093λ, the gain in the endfire direction (near θ=90 degrees) is maximized to 4.53 dBi.

[0068] FIG. 15 shows the radiation directivity (zx plane) of the antenna device 10D at the design frequency f0, and the radiation directivity (zx plane) of an antenna of a conventional structure at the design frequency f0.

[0069] In the case of antennas with conventional structures, the radiation direction of the main lobe is the z-axis direction, but in antenna device 10C, it radiates strongly in the endfire direction (θ = 90 degrees), which is the x-axis direction, and the horizontal gain is improved by approximately 6 dB compared to antennas with conventional structures.

[0070] [Sixth embodiment] (1) Antenna device configuration 16 is a plan view of the antenna device 10E. The dielectric substrate 20E of the antenna device 10E has a length l = 0.53λ, a width w = 3.19λ, a height h = 0.06λ, and a relative dielectric constant ε r = 6.5 The size (width) of the dielectric substrate 20E in the x-axis direction is larger than that of the dielectric substrate 20D.

[0071] On the dielectric substrate 20E, a unit (which may be called unit 1) formed of two conductor elements 210 is arranged symmetrically with respect to the antenna excitation element 100 (dipole antenna element).

[0072] Outside (in the x-axis direction) of the unit formed by the conductor element 210, a unit (which may be called unit 2) formed by two conductor elements 220 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0073] Outside (in the x-axis direction) of the unit formed by the conductor element 220, a unit (which may be called unit 3) formed by two conductor elements 230 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0074] Outside (in the x-axis direction) of the unit formed by the conductor element 230, a unit (which may be called unit 4) formed by two conductor elements 240 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0075] Outside (in the x-axis direction) of the unit formed by the conductor element 240, a unit (which may be called unit 5) formed by two conductor elements 250 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0076] Furthermore, outside (in the x-axis direction) the unit formed by the conductor element 250, a unit (which may be called unit 6) formed by two conductor elements 260 is arranged symmetrically with respect to the antenna excitation element 100 (element of the dipole antenna).

[0077] Conductive element 210 has l1 = 0.174λ and w1 = 0.08λ. Conductive element 220 has l2 = 0.175λ and w2 = 0.08λ. Conductive element 230 has l3 = 0.177λ and w3 = 0.08λ. Conductive element 240 has l4 = 0.174λ and w4 = 0.08λ. Conductive element 250 has l5 = 0.093λ and w5 = 0.08λ. Conductive element 260 has l6 = 0.175λ and w6 = 0.08λ.

[0078] (2) Antenna device performance 17(a) and 17(b) show the relationship between the radiation direction and the gain in the radiation direction and the gain in the endfire direction (θ=90 degrees) for the element length 16 of the antenna device 10E.

[0079] As shown in Figures 17(a) and 17(b), when l6 = 0.175λ, the gain in the endfire direction (near θ = 90 degrees) is maximized to 6.42 dBi.

[0080] FIG. 18 shows the radiation directivity (zx plane) of the antenna device 10E at the design frequency f0, and the radiation directivity (zx plane) of an antenna of a conventional structure at the design frequency f0.

[0081] In the case of antennas with conventional structures, the radiation direction of the main lobe is the z-axis direction, but in antenna device 10E, radiation is strong in the endfire direction (θ=90 degrees), which is the x-axis direction, and the horizontal gain is improved by approximately 7 dB compared to antennas with conventional structures.

[0082] [Actions and Effects] According to the above-described first to sixth embodiments, it is possible to provide an antenna device that uses a metasurface structure, has a low profile, and has end-fire directivity.

[0083] Specifically, the antenna device described above can improve horizontal gain by approximately 4 dB to 10 dB compared to antennas with conventional structures (using metal plates), and can improve endfire directivity. This makes it possible to provide an antenna device that can be suitably installed on an indoor ceiling while keeping its vertical size small.

[0084] Furthermore, by increasing the number of conductive element units and / or changing the conductive element length for each unit, desired directivity and gain can be easily achieved.

[0085] [Other embodiments] The present invention has been described above with reference to the examples, but it will be obvious to those skilled in the art that the present invention is not limited to these examples and that various modifications and improvements are possible.

[0086] For example, in the above-described embodiment, a dipole antenna is used as the antenna excitation element 100, but other antenna elements having bidirectional characteristics, such as a Yagi-Uda antenna, may also be used.

[0087] Furthermore, in the above-described embodiment, the conductive elements are rectangular in shape, but this is not limited to a rectangular shape, and may be, for example, square or cross-shaped.

[0088] Furthermore, each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, a 4th generation mobile communication system (4G), a 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate system, and a next-generation system extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G) may also be applied.

[0089] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0090] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0091] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0092] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0093] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0094] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0095] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0096] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0097] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

[0098] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0099] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0100] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0101] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0102] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0103] 10, 10A~10E Antenna equipment 15 Metasurface Structure 20, 20A~20E Dielectric substrate 30 Conductor plate 100 Antenna excitation element 200, 210, 220, 230, 240, 250, 260 Conductor elements

Claims

1. a metasurface structure in which a plurality of conductive elements are arranged on one plane of a dielectric substrate; an antenna excitation element provided within a predetermined distance from the plane; Equipped with the plurality of conductor elements are arranged symmetrically with respect to the antenna excitation element in a plan view of the dielectric substrate, the conductive element has a rectangular shape in a plan view of the dielectric substrate, The longitudinal direction of the conductor element is arranged parallel to the longitudinal direction of the antenna excitation element, An antenna device in which the longitudinal lengths of the conductor elements differ in a direction perpendicular to the longitudinal direction of the antenna excitation element when viewed in a plane of the dielectric substrate, but the lateral lengths of the conductor elements are the same.

2. 2. The antenna device according to claim 1, wherein the distance from the dielectric substrate to the antenna excitation element is 1 / 4 of the wavelength corresponding to the antenna device.

3. the antenna excitation element is a dipole antenna having two elements, The antenna device according to claim 1 , wherein the plurality of conductive elements are arranged symmetrically with respect to the element in a plan view of the dielectric substrate.

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