WO2021182106A1 - アンテナ装置 - Google Patents

アンテナ装置 Download PDF

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Publication number
WO2021182106A1
WO2021182106A1 PCT/JP2021/006929 JP2021006929W WO2021182106A1 WO 2021182106 A1 WO2021182106 A1 WO 2021182106A1 JP 2021006929 W JP2021006929 W JP 2021006929W WO 2021182106 A1 WO2021182106 A1 WO 2021182106A1
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WIPO (PCT)
Prior art keywords
meta
antenna
low
electrode
film
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/JP2021/006929
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English (en)
French (fr)
Japanese (ja)
Inventor
寅烈 文
面　了明
喜博 坂田
寿文 黒▲崎▼
祥平 森本
▲勝▼澤 姜
昌炯 李
睿浚 徐
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.)
Nissha Co Ltd
Inu Research & Business Foundation
Original Assignee
Nissha Co Ltd
Inu Research & Business Foundation
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 Nissha Co Ltd, Inu Research & Business Foundation filed Critical Nissha Co Ltd
Priority to US17/910,155 priority Critical patent/US12308513B2/en
Priority to EP21767282.3A priority patent/EP4096021B1/en
Priority to CN202180020498.6A priority patent/CN115280591B/zh
Publication of WO2021182106A1 publication Critical patent/WO2021182106A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H01Q15/006—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
    • H01Q15/008—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces said selective devices having Sievenpipers' mushroom elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/273—Adaptation for carrying or wearing by persons or animals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/40—Radiating elements coated with or embedded in protective material
    • 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
    • H01Q15/006—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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
    • H01Q15/0093—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices having a fractal shape

Definitions

  • the present invention relates to an antenna device, particularly an antenna device used in the vicinity of the human body or other conductors.
  • the inventor of the present application has noted that the following problems occur when a conventional electronic device with an antenna is used in close contact with or in the vicinity of a human body (head or hand).
  • the problem is that the radio waves emitted from the antenna are reflected by the human body, which distorts the radiation characteristics of the antenna. In this case, the radio wave is not sufficiently radiated from the antenna in the target direction.
  • An object of the present invention is to sufficiently radiate radio waves in a target direction by suppressing reflection from the human body or other conductors in an antenna device.
  • the seemingly relevant antenna device of the present invention is an antenna device used in contact with or in close proximity to a human body or conductor, comprising an antenna and a meta-surface layer.
  • the meta-surface layer is a layer that is laminated on the antenna and arranged on the human body side.
  • the meta-surface layer has a low-loss film and a meta-surface formed on the low-loss film.
  • the meta-surface layer is located on the human body side of the antenna. Therefore, the meta-surface layer suppresses the reflection of electromagnetic waves from the human body side and reduces the influence on the antenna. As a result, radio waves can be sufficiently radiated in the target direction.
  • the meta-surface is provided on a low loss film. In this case, a small antenna device can be realized by using a thin low-loss film.
  • the low-loss film may be a plurality of laminated films.
  • the meta-surface may be formed on each of the plurality of low-loss films.
  • this device by forming a meta-surface on a multi-layered low-loss film, it is possible to construct an equivalent circuit of a filter that suppresses multiple reflections by configuring a multi-stage circuit even with a thin low-loss film. Therefore, impedance matching is possible.
  • the thickness of the low-loss film may be 150 ⁇ m or less.
  • the meta-surface may be fractal in shape.
  • wideband characteristics can be easily realized by increasing the fractal order of the meta surface.
  • radio waves can be sufficiently radiated in the target direction by suppressing reflection from the human body.
  • the schematic perspective view of the wireless earphone which incorporated the antenna device which concerns on 1st Embodiment of this invention The schematic diagram which shows the layer structure of an antenna device.
  • Schematic plan view showing the planar positions of the antenna and meta-surface in each low-loss film The schematic diagram which shows the cross-sectional structure of the antenna device of 4th Embodiment. Schematic plan view showing the planar positions of the antenna and meta-surface in each low-loss film. The schematic diagram which shows the cross-sectional structure of the antenna device of 5th Embodiment. Schematic plan view showing the planar position of the meta-surface. The schematic diagram which shows the cross-sectional structure of the antenna device of 6th Embodiment. Schematic plan view showing the planar position of the meta-surface. The schematic diagram which shows the plane composition of the ground. The schematic plan view which shows the plane position of the antenna, the meta surface in each low loss film in 7th Embodiment.
  • FIG. 6 is a schematic perspective view of a smart glass in which the antenna device according to the eleventh embodiment is incorporated.
  • the schematic diagram which shows the layer structure of an antenna device.
  • Schematic perspective view of a continuous blood glucose meter The schematic diagram which shows the cross-sectional structure of an antenna device.
  • Schematic perspective view of the antenna device Schematic plan view of the antenna device. Equivalent circuit diagram of the antenna device.
  • FIG. 1 is a schematic perspective view of a wireless earphone in which the antenna device according to the first embodiment of the present invention is incorporated.
  • the wireless earphone 1 has an antenna device 3 or the like incorporated in the housing.
  • FIG. 2 is a schematic view showing the layer structure of the antenna device.
  • the antenna device 3 is, for example, Blutooth (registered trademark), and has a cover layer 9, an adhesive layer 11, a meta surface layer 13 (an example of a meta surface layer), and a protective layer 15 from the upper side to the lower side in the drawing.
  • the meta-surface layer 13 is composed of one or more low-loss films and a meta-surface (described later).
  • An antenna pattern 17 (an example of an antenna) is formed on the upper side surface of the meta surface layer 13.
  • the meta surface layer 13 is arranged on the human body side with respect to the antenna pattern 17.
  • the antenna film 19 is composed of the meta surface layer 13 and the antenna pattern 17 described above.
  • the cover layer 9 is, for example, polycarbonate and has a thickness of 2 mm.
  • the adhesive layer 11 is, for example, OCA and has a thickness of 25 ⁇ m.
  • the antenna pattern 17 is, for example, copper and has a thickness of 3 ⁇ m.
  • FIG. 3 is a schematic view showing a cross-sectional structure of the antenna film.
  • the antenna film 19 has a first low-loss film 20A, a second low-loss film 20B, and a third low-loss film 20C from the lower side of the drawing. These films are laminated to each other.
  • Each low loss film is, for example, PET or COP and has a thickness of 50-150 ⁇ m.
  • the low-loss film may be any material having a low tan ⁇ (low dielectric loss material) and is not particularly limited.
  • the total thickness of the low-loss film is preferably 150 ⁇ m or less.
  • the antenna pattern 17 is formed on the upper surface of the third low-loss film 20C.
  • the first electrode 21A1 of the first meta surface 21A is formed on the upper surface of the first low-loss film 20A.
  • a second electrode 21B1 of the second meta-surface 21B is formed on the upper surface of the second low-loss film 20B.
  • the meta-surface is, for example, copper and has a thickness of 3 ⁇ m.
  • the meta-surface may be made of a visible light transparent conductive film. Specifically, ITO (indium tin oxide) and transparent conductive ink (for example, silver nanowire ink) are used.
  • the meta-surface is a "periodic structure shorter than the artificially constructed incident radio wave wavelength".
  • a ground 29 is formed on the lower side surface of the first low-loss film 20A.
  • the ground 29 is a solid layer formed on the entire surface.
  • the first electrodes 21A1 are arranged in a grid pattern, for example, with a gap between them. A capacitance component is generated in the gap. Further, a capacitance component is also generated between the first electrode 21A1 and the ground 29. Further, an inductance component is generated in the first electrode 21A1 itself. The same applies to the second electrode 21B1.
  • the first meta-surface 21A has a first through hole 21A2 that connects the first electrode 21A1 and the ground 29.
  • the second meta-surface 21B has a second through hole 21B2 that connects the second electrode 21B1 and the ground 29.
  • Each of the first through holes 21A2 corresponds to one first electrode 21A1, penetrates the second low-loss film 20B and the first low-loss film 20A, and connects the first electrode 21A1 and the ground 29. As a result, an inductance component is generated in the first through hole 21A2. The same applies to the second through hole 21B2.
  • FIG. 4 is a schematic plan view showing the plane position of the meta surface.
  • the first electrode 21A1 and the second electrode 21B1 are regular hexagons.
  • the first electrode 21A1 and the second electrode 21B1 are arranged side by side alternately one by one, and do not overlap each other in a plan view.
  • a first through hole 21A2 is provided corresponding to the first electrode 21A1, and a second through hole 21B2 is provided corresponding to the second electrode 21B1.
  • the shape and arrangement position of the electrodes are not particularly limited. For example, the electrodes may partially overlap each other.
  • EBG Electromagnetic Band Gap
  • AMC Artificial Magnetic Controller
  • the thickness of the antenna (for example, the thickness of the antenna film 19) can be reduced to ⁇ / 4 or less while maintaining the radiation efficiency.
  • the periodic structure is made well according to the target frequency, the phase of the electromagnetic wave incident on the EBG structure and the phase of the reflected electromagnetic wave can be made in phase. If the phases are the same, the electromagnetic waves reflected by the EBG structure and the electromagnetic waves radiated into the space without being reflected will strengthen each other even if the thickness is not set to ⁇ / 4. Therefore, it is possible to reduce the thickness while maintaining the radiation efficiency.
  • the first meta-surface 21A and the second meta-surface 21B are provided on the first low-loss film 20A and the second low-loss film 20B, respectively.
  • a small antenna device can be realized by using a thin low-loss film.
  • FIG. 5 is an equivalent circuit diagram of the antenna device.
  • the inductance component L 1 and L 2 occurs between the first electrode 21A1 and the second electrode 21B1 and the ground 29, respectively.
  • capacitance components C 1 and C 2 are generated between the first electrode 21A1 and the second electrode 21B1 and the antenna pattern 17, respectively.
  • the inductance and capacitance can be increased.
  • An equivalent circuit (EBG structure) in which the constituent filters continue periodically can be constructed.
  • the surface energy can be controlled by the concept of the equivalent circuit of the filter, that is, the antenna is suppressed by suppressing multiple reflections by the multi-step configuration of the meta surface arranged on the human body side of the antenna pattern 17.
  • the energy radiated from the pattern 17 to the human body can be reduced, and as a result, the reflection of radio waves from the human body can be reduced.
  • the influence on the antenna pattern 17 is reduced, and radio waves can be sufficiently radiated in the target direction.
  • the meta surface may be composed of holes arranged in a two-dimensional square lattice shape (that is, a matrix shape) having periodicity in the conductive member. Further, the shape of the conductive member or the hole is not particularly limited, and various shapes are possible as long as it can be arranged periodically.
  • FIG. 6 is a schematic plan view showing the plane position of the meta surface in the modified example.
  • the basic configuration is the same as in the above embodiment.
  • the third electrode 21C1 and the fourth electrode 21D1 correspond to the first electrode 21A1 and the second electrode 21B1 of the first embodiment, and are diamond-shaped.
  • the third electrode 21C1 and the fourth electrode 21D1 are arranged side by side alternately one by one, and do not overlap each other in a plan view.
  • a third through hole 21C2 is provided corresponding to the third electrode 21C1, and a fourth through hole 21D2 is provided corresponding to the fourth electrode 21D1.
  • the shape and arrangement position of the electrodes are not particularly limited. For example, the electrodes may partially overlap each other.
  • FIG. 7 is a schematic view showing a cross-sectional configuration of the antenna device of the second embodiment.
  • FIG. 8 is a schematic plan view showing the plane positions of the antenna and the meta surface in each low loss film.
  • the antenna device 3 is, for example, a plate-shaped inverted F antenna (PIFA: Plate Inverted F Antenna) and has a meta surface layer 13.
  • PIFA Plate Inverted F Antenna
  • the meta-surface layer 13 is composed of a plurality of low-loss films and a meta-surface (described later).
  • An antenna pattern 17 is formed on the upper side surface of the meta surface layer 13.
  • the antenna film 19 is composed of the meta surface layer 13 and the antenna pattern 17 described above.
  • the antenna film 19 has a first low-loss film 20A, a second low-loss film 20B, a third low-loss film 20C, and a fourth low-loss film 20D from the lower side of the drawing. These films are laminated to each other.
  • the antenna pattern 17 is formed on the upper surface of the fourth low-loss film 20D.
  • the first electrode 21A1 of the first meta surface 21A is formed on the upper surface of the first low-loss film 20A.
  • a second electrode 21B1 of the second meta-surface 21B is formed on the upper surface of the second low-loss film 20B.
  • a ground 29 is formed on the lower side surface of the first low-loss film 20A.
  • the first electrodes 21A1 are arranged in a grid pattern, for example, with a gap between them. The same applies to the second electrode 21B1.
  • the first meta-surface 21A has a first through hole 21A2 that connects the first electrode 21A1 and the ground 29.
  • the second meta-surface 21B has a second through hole 21B2 that connects the second electrode 21B1 and the ground 29.
  • Each of the first through holes 21A2 corresponds to one first electrode 21A1, penetrates the second low-loss film 20B and the first low-loss film 20A, and connects the first electrode 21A1 and the ground 29. The same applies to the second through hole 21B2.
  • FIG. 9 is a schematic view showing a cross-sectional configuration of the antenna device of the third embodiment.
  • FIG. 10 is a schematic plan view showing the plane positions of the antenna and the meta surface in each low loss film.
  • the antenna device 3 is, for example, a plate-shaped inverted-F antenna (PIFA) and has a meta-surface layer 13.
  • the meta-surface layer 13 is composed of a plurality of low-loss films and a meta-surface (described later).
  • An antenna pattern 17 is formed on the upper side surface of the meta surface layer 13.
  • the antenna film 19 is composed of the meta surface layer 13 and the antenna pattern 17 described above.
  • the antenna film 19 includes a first low-loss film 20A, a second low-loss film 20B, a third low-loss film 20C, a fourth low-loss film 20D, and a fifth low-loss film 20E from the lower side of the drawing. doing. These films are laminated to each other.
  • the antenna pattern 17 is formed on the upper surface of the fifth low-loss film 20E.
  • the first electrode 21A1 of the first meta surface 21A is formed on the upper surface of the second low-loss film 20B.
  • a second electrode 21B1 of the second meta-surface 21B is formed on the upper surface of the third low-loss film 20C.
  • a ground 29 is formed on the upper surface of the first low-loss film 20A.
  • a third electrode 30 is formed on the lower surface of the first low-loss film 20A.
  • the first electrodes 21A1 are arranged in a grid pattern, for example, with a gap between them. The same applies to the second electrode 21B1.
  • the first meta-surface 21A has a first through hole 21A2 connecting the first electrode 21A1, the ground 29, and the third electrode 30.
  • the second meta-surface 21B has a second through hole 21B2 that connects the second electrode 21B1 and the ground 29.
  • the first through hole 21A2 corresponds to one first electrode 21A1 and one third electrode 30, respectively, and penetrates the second low loss film 20B and the first low loss film 20A. The same applies to the second through hole 21B2.
  • the number of laminated low-loss films on which the meta surface is formed is two, but it may be more than that.
  • a fourth embodiment will be described as such an embodiment with reference to FIGS. 11 and 12.
  • FIG. 11 is a schematic view showing a cross-sectional configuration of the antenna device of the fourth embodiment.
  • FIG. 12 is a schematic plan view showing the plane positions of the antenna and the meta surface in each low loss film.
  • the lower side of the figure is the human body side.
  • the antenna device 3 is, for example, a dipole antenna and has a meta-surface layer 13.
  • the meta-surface layer 13 is composed of a plurality of low-loss films and a meta-surface (described later).
  • An antenna pattern 17 is formed on the upper side surface of the meta surface layer 13.
  • the antenna film 19 is composed of the meta surface layer 13 and the antenna pattern 17 described above.
  • the antenna film 19 has a first low-loss film 20A, a second low-loss film 20B, a third low-loss film 20C, and a fourth low-loss film 20D from the lower side of the drawing. These films are laminated to each other.
  • the antenna pattern 17 is formed on the upper surface of the fourth low-loss film 20D.
  • the first electrode 21A1 of the first meta surface 21A is formed on the upper surface of the first low-loss film 20A.
  • a second electrode 21B1 of the second meta-surface 21B is formed on the upper surface of the second low-loss film 20B.
  • a third electrode 21C1 of the third meta-surface 21C is formed on the upper surface of the third low-loss film 20C.
  • a ground 29 is formed on the lower side surface of the first low-loss film 20A.
  • the first electrodes 21A1 are arranged in a grid pattern with a gap between them. The same applies to the second electrode 21B1 and the third electrode 21C1.
  • the first meta-surface 21A has a first through hole 21A2 that connects the first electrode 21A1 and the ground 29.
  • the second meta-surface 21B has a second through hole 21B2 that connects the second electrode 21B1 and the ground 29.
  • the third meta-surface 21C has a third through hole 21C2 that connects the third electrode 21C1 and the ground 29.
  • Each of the first through holes 21A2 corresponds to one first electrode 21A1 and penetrates the first low-loss film 20A to connect the first electrode 21A1 and the ground 29. The same applies to the second through hole 21B2 and the third through hole 21C2.
  • the electrodes of the meta surface and the ground are connected via through holes, but by increasing the area of the electrodes or shortening the distance between the layers, the electrodes and the ground are connected to each other through through holes.
  • the through hole of the electrode may be omitted.
  • FIG. 13 is a schematic view showing a cross-sectional configuration of the antenna device of the fifth embodiment.
  • FIG. 14 is a schematic plan view showing the plane positions of the antenna and the meta surface in each low loss film.
  • the antenna device 3 is, for example, a plate-shaped inverted-F antenna (PIFA: Plate Inverted F Antenna) and has a meta-surface layer 13A.
  • PIFA Plate Inverted F Antenna
  • the meta-surface layer 13A comprises a low-loss film and a meta-surface (described later).
  • An antenna pattern 17A is formed on the upper side surface of the meta surface layer 13A on the drawing.
  • the antenna film 19A is composed of the meta surface layer 13A and the antenna pattern 17A described above.
  • the antenna film 19A has a first low-loss film 22A, a second low-loss film 22B, and a third low-loss film 22C from the lower side of the drawing. These films are laminated to each other.
  • the antenna pattern 17A is formed on the upper surface of the third low-loss film 22C. Under the second low-loss film 20B, the meta-surface electrode 13A1 is formed.
  • the electrode 13A1 has, for example, a combination of a pair of electrodes extending side by side in one direction, as shown in FIG. More specifically, the pair of electrodes 13A1 have triangular protrusions extending toward each other, and a portion in which a zigzag (sawtooth-like) electrode is not formed is secured between the pair of electrodes. doing.
  • a ground 29A is formed on the lower side surface of the first low-loss film 22A. From the above, only the first low-loss film 22A is arranged between the electrodes 13A1 and the ground 29A on the meta surface.
  • the through hole connecting the electrode and the ground is not formed.
  • the antenna performance is maintained by, for example, one or a plurality of features such as the wide shape of the electrode and the short distance between the electrode and the ground.
  • FIG. 15 is a schematic view showing a cross-sectional configuration of the antenna device of the sixth embodiment.
  • FIG. 16 is a schematic plan view showing the plane position of the meta surface.
  • FIG. 17 is a schematic plan view showing a plan structure of the ground.
  • the antenna device 3 has a meta-surface layer 13.
  • the meta-surface layer 13 is composed of a plurality of low-loss films and a meta-surface (described later).
  • An antenna pattern 17 is formed on the upper side surface of the meta surface layer 13.
  • the antenna film 19 is composed of the meta surface layer 13 and the antenna pattern 17 described above.
  • the antenna film 19 has a first low-loss film 20A and a second low-loss film 20B from the lower side of the drawing. These films are laminated to each other.
  • the antenna pattern 17 is formed on the upper surface of the second low-loss film 20B.
  • a first meta-surface 21A is formed on the upper surface of the first low-loss film 20A.
  • the first meta-surface 21A is a complementary split ring resonator (CSRR), and has a split ring-shaped notch 31.
  • CSRR complementary split ring resonator
  • a ground 29B is formed on the lower side of the first low-loss film 20A.
  • the ground 29B has a ground defect structure (DGS: Defected Ground Structure) in which a notch 33 corresponding to the first meta surface 21A is formed.
  • the notch 33 has an H shape. From the above, the antenna film 19 without through holes is realized. Further, from the above, although the meta surface is one layer, a multi-stage equivalent circuit similar to that of the first embodiment can be realized.
  • FIG. 18 is a schematic plan view showing the planar positions of the antenna and the meta surface in each low loss film according to the seventh embodiment.
  • FIG. 19 is a schematic plan view of the meta surface in the modified example.
  • the layer structure of the seventh embodiment is the same as that of the fifth embodiment. That is, the meta-surface is one layer.
  • the antenna pattern 17A is a linear shape extending in one direction.
  • the power supply of the antenna pattern 17A is performed at the center position of the whole.
  • the first electrode 21A1 of the first meta surface 21A has an H-shape in a plan view.
  • AMC Artificial Magnetic Conductor
  • the antenna pattern 17B has a co-planar wave-line (CPW) path structure, and the antenna power is supplied at the lower end of the CPW.
  • CPW co-planar wave-line
  • FIG. 20 is a schematic plan view of the meta surface according to the eighth embodiment.
  • the electrode 41 of the meta surface 21 has a fractal shape.
  • a fractal is one in which the part of the figure and the whole are self-similar (recursive).
  • the electrode 41 of the meta surface 21 has a shape composed of a large number of self-similar quadrangles.
  • the smallest unit of the electrode 41 is a quadrangular conductive member, and the conductive member has a quadrangular portion in the center where the conductive member is not formed.
  • the electrodes of the meta-surface adopt the fractal shape as described above, wideband and miniaturization are easy. In particular, as the order of fractals increases, wideband characteristics can be obtained. Conventionally, it has been considered to omit through holes in the meta surface due to manufacturing problems. However, in that case, in order to ensure the same performance, there is a problem that the area of the meta surface and the whole area becomes large. If the electrodes of the meta-surface have a fractal shape as in this embodiment, various equivalent circuits can be created, so that the overall size can be reduced while maintaining the performance. As a result, through holes can be omitted. In this embodiment, the meta-surface is single-layered, but may be multi-layered. Through holes may or may not be provided in the case of multiple layers.
  • FIG. 21 is a schematic plan view of the meta surface according to the ninth embodiment.
  • the electrode 41A of the meta-surface 21 has a fractal shape.
  • the electrode 41A has a shape composed of a large number of self-similar quadrangles.
  • the electrode 41A is an example in which the order of fractals is larger than that of the electrode 41.
  • FIG. 22 is a schematic plan view of the meta surface according to the tenth embodiment.
  • the electrode 41B of the meta-surface 21 has a fractal shape.
  • the electrode 41B is a figure composed of innumerable self-similar triangles.
  • the minimum unit of the electrode 41B is a triangular conductive member, and there is a triangular portion in the opposite direction in which the conductive member is not formed between the three conductive members in the same direction.
  • FIG. 23 is a schematic perspective view of a smart glass incorporating the antenna device according to the eleventh embodiment.
  • FIG. 24 is a schematic view showing the layer structure of the antenna device.
  • the smart glass 81 has a built-in antenna device 83.
  • the lower side of the figure is the human body side.
  • the antenna device 83 is, for example, Brutooth (registered trademark), from the upper side to the lower side in the drawing, the first cover layer 123, GND125, the insulating substrate 127, the double-sided adhesive tape 129, and the meta surface layer 113 (meta surface). It has an example of a layer) and a second cover layer 131.
  • the meta-surface layer 113 comprises one or more low-loss films and a meta-surface (see below).
  • An antenna pattern 117 is formed on the lower side surface of the meta surface layer 113 in the drawing.
  • the meta surface layer 113 is arranged on the human body side with respect to the antenna pattern 117.
  • the antenna film 119 is composed of the meta surface layer 113 and the antenna pattern 117 described above.
  • the structure of the meta surface layer 113 is the same as that of the meta surface layers of the first to tenth embodiments.
  • FIG. 25 is a schematic perspective view of a continuous blood glucose meter incorporating the antenna device according to the twelfth embodiment.
  • FIG. 26 is a schematic view showing a cross-sectional configuration of the antenna device.
  • FIG. 27 is a schematic perspective view of the antenna device.
  • FIG. 28 is a schematic plan view of the antenna device.
  • FIG. 29 is an equivalent circuit diagram of the antenna device.
  • the continuous blood glucose meter (GMC: Continuous Glucose Monitoring) 201 is worn on a human arm, and the measurement result is displayed on, for example, a display device (not shown).
  • the GMC 201 has an antenna device 203.
  • the antenna device 203 is, for example, a dipole antenna, and has an antenna film 205 as shown in FIG.
  • the antenna film 205 has a first low-loss film 207, a second low-loss film 209, and a third low-loss film 211 from the bottom to the top of the drawing. These films are laminated to each other.
  • the antenna film 205 has a ground 221 formed on the lower surface of the first low-loss film 207.
  • the antenna film 205 has a first conductor pattern 213 formed on the upper surface of the first low loss film 207.
  • the first conductor pattern 213 is circular in a plan view.
  • a first through hole 215 extends from the first conductor pattern 213 to the ground 221.
  • the first through hole 215 constitutes an antenna feeding unit.
  • the antenna film 205 has a second conductor pattern 217 formed on the upper surface of the second low loss film 209.
  • the second conductor pattern 217 is circular in a plan view.
  • the second conductor pattern 217 has a larger area than the first conductor pattern 213, and covers the first conductor pattern 213 in a plan view.
  • a plurality of second through holes 219 extend from the second conductor pattern 217 to the ground 221.
  • the second through hole 219 is arranged around the first conductor pattern 213.
  • a capacitance component CL is generated between the first conductor pattern 213 and the second conductor pattern 217. Between the second conductor pattern 217 and the ground 221, the capacitance component C R occurs.
  • An inductance component LR is generated in the second conductor pattern 217.
  • An inductance component LL is generated in the second through hole 219.
  • FIGS. 27 and 28 there are four second through holes 219, which are arranged at equal intervals in the circumferential direction, that is, with periodicity.
  • FIG. 29 an equivalent circuit that realizes the right-handed and left-handed composite line (CRLH: Company Right- / Left-Handed Transmission Line) characteristics is formed.
  • ZOR Zero Order Resonance
  • a current flows through the second through hole 219 even in the human body and the surrounding environment, so that a large amount of current of the dipole antenna flows as a whole.
  • the antenna film 205 functions as a wideband antenna.
  • the number of second through holes is not limited.
  • the present invention is widely applicable to antenna devices used in the vicinity of the human body or other conductors.
  • Wireless earphone 3 Antenna device 9: Cover layer 11: Adhesive layer 13: Meta surface layer 19: Antenna film 20A: First low loss film 20B: Second low loss film 21A: First meta surface 21A 1: First 1 electrode 21A2: 1st through hole 21B: 2nd meta surface 21B1: 2nd electrode 21B2: 2nd through hole

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  • Optics & Photonics (AREA)
  • Details Of Aerials (AREA)
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PCT/JP2021/006929 2020-03-13 2021-02-24 アンテナ装置 Ceased WO2021182106A1 (ja)

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EP21767282.3A EP4096021B1 (en) 2020-03-13 2021-02-24 Antenna device
CN202180020498.6A CN115280591B (zh) 2020-03-13 2021-02-24 天线装置

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CN115280591B (zh) 2025-08-19
TW202207523A (zh) 2022-02-16
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CN115280591A (zh) 2022-11-01
EP4096021A1 (en) 2022-11-30
US12308513B2 (en) 2025-05-20
EP4096021B1 (en) 2024-08-21
JP2021145318A (ja) 2021-09-24
US20230130575A1 (en) 2023-04-27
TWI872217B (zh) 2025-02-11

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