WO2023026949A1 - Appareil d'antenne de véhicule - Google Patents

Appareil d'antenne de véhicule Download PDF

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Publication number
WO2023026949A1
WO2023026949A1 PCT/JP2022/031194 JP2022031194W WO2023026949A1 WO 2023026949 A1 WO2023026949 A1 WO 2023026949A1 JP 2022031194 W JP2022031194 W JP 2022031194W WO 2023026949 A1 WO2023026949 A1 WO 2023026949A1
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WO
WIPO (PCT)
Prior art keywords
conductive layer
dielectric plate
antenna device
frame
conductive
Prior art date
Application number
PCT/JP2022/031194
Other languages
English (en)
Japanese (ja)
Inventor
聡史 船津
Original Assignee
Ａｇｃ株式会社
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 Ａｇｃ株式会社 filed Critical Ａｇｃ株式会社
Priority to JP2023543860A priority Critical patent/JPWO2023026949A1/ja
Priority to DE112022004088.2T priority patent/DE112022004088T5/de
Publication of WO2023026949A1 publication Critical patent/WO2023026949A1/fr

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    • 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
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J1/00—Windows; Windscreens; Accessories therefor
    • 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
    • H01Q1/405—Radome integrated radiating elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/422—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna

Definitions

  • the present disclosure relates to a vehicle antenna device.
  • Patent Document 1 describes that the electric element arranged inside the intermediate film is an antenna element, a light control body, or a light-emitting sheet instead of a heating element.
  • the electric element arranged inside the intermediate film is an antenna element, a light control body, or a light-emitting sheet instead of a heating element.
  • the present disclosure provides a vehicle antenna device that combines the function of an antenna with another electrical function that is different from an antenna.
  • a first dielectric plate having a main surface; a second dielectric plate disposed directly or indirectly on the main surface with respect to the first dielectric plate; a first conductive layer disposed between a first intermediate film and a second intermediate film between the first dielectric plate and the second dielectric plate; between the first dielectric plate and the first intermediate film, between the second dielectric plate and the second intermediate film, or on the side opposite to the main surface with respect to the second dielectric plate a conductive frame disposed in the first dielectric plate and having an inner edge along the outer edge of the first conductive layer in a plan view of the first dielectric plate; a power supply unit electrically connected to the conductive frame; a voltage control unit electrically connected to the first conductive layer and including a power supply for controlling a voltage applied to the first conductive layer; with A vehicle antenna device is provided in which the conductive frame has an electrical resistance lower than that of the first conductive layer and functions as a part of an antenna that transmits and receives radio waves in a predetermined frequency band
  • a first dielectric plate having a main surface; a second dielectric plate disposed directly or indirectly on the main surface with respect to the first dielectric plate; a first conductive layer disposed between a first intermediate film and a second intermediate film between the first dielectric plate and the second dielectric plate; a second conductive layer disposed between the first intermediate film and the first dielectric plate and having a lower electrical resistance than the first conductive layer; a power feeding portion electrically connected to a conductor region of the second conductive layer outside the first conductive layer in a plan view of the first dielectric plate; a voltage control unit electrically connected to the first conductive layer and including a power supply for controlling a voltage applied to the first conductive layer; with A vehicle antenna device is provided in which the second conductive layer functions as a part of an antenna that transmits and receives radio waves in a predetermined frequency band.
  • the term "directly or indirectly arranged" means that the means
  • a vehicle antenna device that combines the function of an antenna with another electrical function that is different from an antenna.
  • FIG. 4 is a diagram illustrating two routes from a power supply section to a ground conductor section along the outer edge of a conductive frame;
  • FIG. 4 is a diagram illustrating two routes from a power supply section to a connection section along the outer edge of a conductive frame
  • FIG. 11 is an exploded perspective view showing a configuration example of a vehicle antenna device according to a second embodiment
  • FIG. 11 is an exploded perspective view showing a configuration example of a vehicle antenna device according to a third embodiment
  • 1 is a plan view of a simulation model of a vehicle antenna device
  • FIG. 5 is a diagram showing an example of a simulation result of a reflection coefficient S11 with respect to a clockwise path length DCW from the feeding section to the ground conductor along the outer edge of the conductive frame in the vehicle antenna device of the first embodiment
  • FIG. 5 is a diagram showing an example of a simulation result of a reflection coefficient S11 with respect to a counterclockwise path length D CCW from the feeding section to the ground conductor along the outer edge of the conductive frame in the vehicle antenna device of the first embodiment; .
  • FIG. 4 is a diagram showing;
  • X-axis direction, the Y-axis direction, and the Z-axis direction are orthogonal to each other.
  • "XY plane”, “YZ plane” and “ZX plane” respectively refer to a virtual plane parallel to the X-axis direction and the Y-axis direction, a virtual plane parallel to the Y-axis direction and the Z-axis direction, and a Z plane. It represents a virtual plane parallel to the axial direction and the X-axis direction.
  • Examples of vehicle window glass used in vehicle antenna devices according to various embodiments of the present disclosure include a rear glass attached to the rear of a vehicle, a windshield attached to the front of the vehicle, a side glass attached to the side of the vehicle, There is a roof glass that is attached to the ceiling of a vehicle. Vehicle window glass is not limited to these examples.
  • FIG. 1 is a plan view showing one configuration example of the vehicle antenna device of the first embodiment.
  • An antenna device 201 shown in FIG. 1 is a vehicle antenna device that includes a vehicle window glass 101 and a voltage control section 110 .
  • FIG. 1 illustrates a windowpane 101 attached to a window frame 63 formed on a vehicle body portion 62 that is a part of a vehicle 60 as seen from the inside of the vehicle.
  • the positive side in the Z-axis direction represents the inside of the vehicle
  • the negative side in the Z-axis direction represents the outside of the vehicle.
  • the vehicle window glass of the first embodiment is applied to a window glass (for example, side glass) that is installed substantially parallel to the vertical direction perpendicular to the horizontal plane, so that the reception sensitivity of both vertical and horizontal polarized waves is It is particularly suitable in that (antenna gain) is improved.
  • FIG. 1 shows an example of a window glass 101 applied to a side glass of a vehicle.
  • the window frame 63 is a conductive part that can be grounded, and is also called a flange.
  • the window frame 63 has a frame 61 forming an opening covered by the window glass 101 .
  • Frame sides 61a, 61b, 61c, and 61d are illustrated in FIG.
  • the frame 61 is an example of the inner edge of the window frame 63 .
  • the windowpane 101 has an outer peripheral edge 13 including outer edges 13a, 13b, 13c, and 13d.
  • the window glass 101 is attached to the window frame 63 so that the outer peripheral edge 13 overlaps with the window frame 63 in a plan view from the inside of the vehicle. , 61c and 61d.
  • the outer edges 13a, 13b, 13c, and 13d are hidden by the vehicle body portion 62 or the window frame 63. However, in FIG. It is shown.
  • FIG. 2 is an exploded perspective view showing one configuration example of the vehicle antenna device of the first embodiment.
  • the window glass 101 is laminated glass including glass plate 10 , glass plate 20 , conductive layer 30 , intermediate film 40 , conductive frame 70 , and feeding portion 80 as main components.
  • the glass plate 10 has a plate-like shape having a main surface 11 facing the positive side in the Z-axis direction and a main surface 12 facing the side opposite to the main surface 11 in the Z-axis direction (negative side in the Z-axis direction). Dielectric.
  • the glass plate 10 may be transparent or translucent.
  • the main surface 11 is a surface inside the vehicle, and the main surface 12 is a surface outside the vehicle.
  • the glass plate 10 is an example of a first dielectric plate or a first glass plate, which will be described later.
  • the glass plate 20 is arranged facing the main surface 11 with respect to the glass plate 10 .
  • the glass plate 20 is a dielectric plate having a principal surface 14 facing the positive side in the Z-axis direction and a principal surface 15 facing away from the principal surface 14 in the Z-axis direction.
  • the glass plate 20 may be transparent or translucent.
  • the main surface 14 is a surface inside the vehicle, and the main surface 15 is a surface outside the vehicle.
  • the glass plate 20 is an example of a second dielectric plate or a second glass plate, which will be described later.
  • the conductive layer 30 is a conductor arranged between the intermediate films 40A and 40B between the glass plates 10 and 20.
  • the conductive layer 30 is a planar conductor facing the main surface 11 of the glass plate 10 .
  • Conductive layer 30 may be transparent or translucent.
  • Specific examples of the conductive layer 30 include a metal film such as an Ag (silver) film, a metal oxide film such as an ITO (indium tin oxide) film, a resin film containing conductive fine particles, and a laminate in which multiple types of films are laminated. etc.
  • the conductive layer 30 may be coated with a resin film such as polyethylene terephthalate by vapor deposition or the like.
  • the conductive layer 30 may be a mesh formed on a film by conductive ink or etching.
  • the conductive layer 30 is an example of a first conductive layer, which will be described later.
  • the conductive layer 30 is, for example, a conductive film included in a light control film that actively changes the visible light transmittance of the opening of the window glass 101 by applying an AC voltage.
  • FIG. 3 is a cross-sectional view schematically showing an example of a laminated structure of a window glass having a light control film inside.
  • the light control film 120 illustrated in FIG. 3 is sandwiched between the intermediate film 40A and the intermediate film 40B.
  • Light control film 120 includes resin substrates 121 and 122 facing each other between intermediate film 40A and intermediate film 40B, light control layer 123 disposed between resin substrates 121 and 122, and resin substrates 121 and 122. and conductive films 124 and 125 formed on the main surface of the .
  • the light modulating layer 123 is a molecular layer having optical anisotropy.
  • the conductive films 124 and 125 are examples of the conductive layer 30 .
  • Light control by the light control film 120 functions by voltage applied between the pair of conductive films 124 and 125 .
  • the resin substrates 121 and 122 are made of transparent resin, for example.
  • the resin substrates 121, 122 have, for example, polyethylene terephthalate (PET), polycarbonate (PC), or cycloolefin polymer (COP).
  • PET polyethylene terephthalate
  • PC polycarbonate
  • COP cycloolefin polymer
  • the resin substrates 121 and 122 may be formed by combining two or more of these resins.
  • the thickness of each of the resin substrates 121 and 122 is, for example, in the range of 5 ⁇ m to 500 ⁇ m, preferably in the range of 10 ⁇ m to 200 ⁇ m, more preferably in the range of 50 ⁇ m to 150 ⁇ m.
  • the conductive films 124 and 125 are conductors contained in the light control film, such as a transparent conductive oxide, a transparent conductive polymer, a laminated film of a metal layer and a dielectric layer, silver nanowires, or silver or copper. metal mesh or the like.
  • the thickness of each of the conductive films 124 and 125 may range, for example, from 200 nm to 2 ⁇ m.
  • Liquid crystals are examples of molecules with optical anisotropy. That is, for example, a liquid crystal layer may be used as the molecular layer having optical anisotropy.
  • the liquid crystal layer include polymer dispersed liquid crystal (PDLC), polymer network liquid crystal (PNLC), and guest-host liquid crystal.
  • PDLC polymer dispersed liquid crystal
  • PNLC polymer network liquid crystal
  • guest-host liquid crystal Alternatively, iodine or the like may be used as the molecule having optical anisotropy.
  • the light management film may have a Suspended Particle Device (SPD) containing such molecular layers.
  • SPD Suspended Particle Device
  • the conductive layer 30 is not limited to the conductor included in the light control film, and may have other functions as long as it is a conductive layer.
  • the conductive layer 30 may have functions such as anti-icing and anti-fogging of the window glass 101 due to heat generated by voltage application.
  • the intermediate film 40 is a transparent or translucent dielectric interposed between the glass plate 10 and the glass plate 20 .
  • the glass plate 10 and the glass plate 20 are bonded by the intermediate film 40 .
  • the intermediate film 40 include thermoplastic polyvinyl butyral (PVB), ethylene vinyl acetate copolymer (EVA), and the like.
  • PVB thermoplastic polyvinyl butyral
  • EVA ethylene vinyl acetate copolymer
  • the dielectric constant of the intermediate film 40 is preferably 2.4 or more and 3.5 or less.
  • the intermediate film 40 includes an intermediate film 40A and an intermediate film 40B, and the conductive layer 30 is provided between the intermediate film 40A and the intermediate film 40B.
  • the intermediate film 40A is an example of a first intermediate film, which will be described later, and is interposed between the glass plate 10 and the conductive layer 30.
  • the intermediate film 40 ⁇ /b>B is an example of a second intermediate film, which will be described later, and is interposed between the glass plate 20 and the
  • the conductive frame 70 is a frame-shaped conductor arranged on the opposite side of the main surface 11 of the glass plate 20 .
  • the conductive frame 70 may be arranged, for example, in direct contact with the main surface 14 of the glass plate 20, or may be arranged indirectly on the main surface 14 via a dielectric (not shown).
  • the conductive frame 70 has an inner edge 71 along the outer edge 31 of the conductive layer 30 in plan view of the glass plate 10 .
  • the conductive frame 70 is made of copper, silver, or the like, for example.
  • the conductive frame 70 may be arranged between the glass plate 10 and the intermediate film 40A, or may be arranged between the glass plate 20 and the intermediate film 40B.
  • the conductive frame 70 has an inner edge 71 along the outer edge 31 of the conductive layer 30 in a plan view of the glass plate 10 regardless of the position of the conductive frame 70 .
  • the power supply section 80 is an example of a power supply section electrically connected to the conductive frame 70, and is, for example, an electrode for power supply.
  • the power supply unit 80 is provided near the outer peripheral edge 13 of the glass plate 20 so as to be positioned near the window frame 63 when the window glass 101 is attached to the window frame 63 .
  • the power supply unit 80 is electrically connected to one end of a power supply line 90 or an input terminal of an amplifier via a conductive member such as a connector.
  • the other end of the feeder line 90 or the output terminal of the amplifier is connected to a communication device such as a receiver, for example.
  • the feeder line 90 is, for example, a coaxial cable having a signal line 91 and a ground portion 92 .
  • the ground portion 92 may be a shielded wire.
  • One end of the signal line 91 is electrically connected to the power supply portion 80, and one end of the ground portion 92 is grounded through the vehicle body portion 62 (or the window frame 63).
  • the power supply line 90 may be a microstrip line.
  • the power supply part 80 may protrude outside the conductive frame 70 in plan view of the glass plate 20 .
  • a conductive member such as a connector that electrically connects one end of the power supply line 90 (one end of the signal line 91) or the input terminal of the amplifier and the power supply unit 80 can be brought into contact with the power supply unit 80.
  • the shape of the power supply portion 80 is preferably square, substantially square, rectangular, substantially rectangular, or any other square or polygonal shape for mounting, but is not limited thereto, and may be circular, substantially circular, elliptical, substantially elliptical, or any other circular shape. other shapes are also possible.
  • the voltage control section 110 is electrically connected to the conductive layer 30 and controls the voltage applied to the conductive layer 30 .
  • the voltage control section 110 is a control unit including a power supply 111, for example.
  • a power supply 111 for example.
  • the conductive layer 30 is the conductive films 124 and 125 of the light control film 120 of FIG.
  • the resulting voltage 113 is applied to the conductive film 125 .
  • an AC voltage is applied between the conductive films 124 and 125, and light control by the light control film 120 is controlled.
  • the conductive frame 70 has an inner edge 71 along the outer edge 31 of the conductive layer 30, so it is electrically connected to the conductive layer 30 by capacitive coupling. Therefore, by attaching the window glass 101 to the conductive window frame 63, the conductive layer 30 and the conductive frame 70 can function as antenna conductors of the patch antenna, and the vehicle body portion 62 and the window frame 63 can function as patch antennas. can serve as the ground for Since the conductive layer 30 and the conductive frame 70 function as antenna conductors, a high-frequency current generated in the conductive frame 70 along the outer edge 31 of the conductive layer 30 is extracted from the power supply section 80 electrically connected to the conductive frame 70. can.
  • the conductive frame 70 has an electrical resistance lower than that of the conductive layer 30, a high-frequency current generated in the conductive frame 70 along the outer edge 31 of the conductive layer 30 easily flows. is used as an antenna conductor, the antenna gain of the patch antenna is improved.
  • a sheet resistance value (unit: ⁇ / ⁇ ) is given as an index for evaluating the level of the “electrical resistance” referred to here.
  • the conductive frame 70 is a slot that uses the gap (in plan view of the windowpane 101) between the conductive frame 70 and the window frame 63 as a slot. Acts as part of the antenna.
  • the conductive layer 30 and the conductive frame 70 each function as part of a patch antenna that transmits and receives (one or both of transmission and reception) radio waves in a predetermined frequency band. do.
  • the conductive frame 70 functions as part of a slot antenna that transmits and receives radio waves in a predetermined frequency band. Therefore, even if the conductive layer 30 having relatively high electrical resistance is used, it is possible to provide the antenna device 201 capable of transmitting and receiving radio waves in a predetermined frequency band with high gain.
  • An antenna using the conductive frame 70 is hereinafter referred to as an antenna ANT.
  • the antenna ANT operates using the feeding section 80 as a feeding point.
  • the antenna ANT may be used as a receiving antenna for receiving radio waves outside the vehicle such as broadcast waves, or may be used as a wireless communication antenna for transmitting and receiving radio waves to and from a communication device outside the vehicle.
  • the antenna ANT is, for example, an antenna capable of transmitting and receiving radio waves in the VHF (Very High Frequency) band with frequencies of 30 MHz to 300 MHz.
  • VHF Very High Frequency
  • Specific examples of frequency bands included in the VHF band include the FM broadcast wave band (eg, 76 MHz to 108 MHz) and the DAB Band III band (eg, 170 MHz to 240 MHz).
  • the antenna ANT may be, for example, an antenna capable of transmitting and receiving radio waves in the UHF (Ultra High Frequency) band with a frequency of 300 MHz to 3 GHz.
  • UHF Ultra High Frequency
  • a specific example of the frequency band included in the UHF band is the band of digital terrestrial television broadcast waves (for example, 470 MHz to 713 MHz).
  • the conductive frame 70 has a closed loop shape, high-frequency current can easily flow through the conductive frame 70, so the antenna gain of the antenna ANT is improved.
  • a part of the conductive frame 70 may have a notch.
  • the shape of the conductive frame 70 is not limited to a substantially rectangular shape, and may be a substantially triangular shape or other polygonal shape.
  • the frame portion 70a When the power supply portion 80 is arranged near the corner portion 73a of the conductive frame 70, the frame portion 70a extending in the X-axis direction (e.g., horizontal direction) and the frame portion extending in the Y-axis direction (e.g., vertical direction).
  • the proximity of 70c improves antenna gain for both horizontal and vertical polarization.
  • the direction of the electric field generated in each of the frame portions 70a and 70b facing each other in the Y-axis direction is the positive side in the Y-axis direction.
  • the direction of the electric field generated in each of the frames 70c and 70d aligned on the negative side and facing each other in the X-axis direction widens the range in which they are aligned on the positive side or the negative side in the X-axis direction.
  • Frame portions 70a and 70b extending in the X-axis direction generate an electric field in the Y-axis direction
  • frame portions 70c and 70d extending in the Y-axis direction generate an electric field in the X-axis direction. Therefore, by arranging the power supply portion 80 near the corner portion 73a, it becomes easy to receive electric fields in the X-axis direction and the Y-axis direction, so that the window glass 101 is tilted with respect to the horizontal plane or the vertical plane. Even in the on-board environment, the antenna gain for both horizontal and vertical polarization is improved.
  • the power supply portion 80 may be arranged near another corner of the conductive frame 70 (for example, the corner 73b, the corner 73c, or the corner 73d). According to this aspect, similarly to the case where the antenna is arranged near the corner portion 73a, the antenna gain for both the horizontally polarized wave and the vertically polarized wave is improved.
  • the vicinity of the corner portion 73a means 0 ⁇ DX. It is defined as a region where the formula ⁇ (1/3) ⁇ L X holds.
  • the length of the frame portion 70c extending in the Y-axis direction from the corner portion 73a is LY, and the distance from the corner portion 73a in the Y-axis direction is DY , the vicinity of the corner portion 73a means 0 ⁇ DY . It is defined as a region where the formula ⁇ (1/3) ⁇ L Y holds.
  • the vicinity of other corners (for example, corner 73b, corner 73c, or corner 73d) of conductive frame 70 is similarly defined.
  • the frame portion 70a is an example of a first side, which will be described later, extending from the corner in the first direction
  • the frame portion 70c is an example of a second side, which will be described later, extending from the corner in the second direction. is.
  • the window glass 101 may be attached to the window frame 63 so that the main surfaces 11 and 12 are substantially horizontal.
  • the term “substantially horizontal” or “substantially horizontal” refers to a range within ⁇ 30° with respect to the horizontal plane, but may be within ⁇ 15°, may be within ⁇ 10°, or may be within ⁇ 5°. or within ⁇ 3°.
  • a roof glass is exemplified as the window glass 101 attached so that the main surfaces 11 and 12 are substantially horizontal.
  • the antenna ANT transmits arbitrary polarized waves (for example, linearly polarized waves, circularly polarized waves, etc.) arriving from the vertical direction (zenith direction). Reception becomes possible.
  • the antenna ANT may be an antenna for transmitting and receiving radio waves for satellite communication (for example, radio waves arriving with circular polarization).
  • Antenna ANT may be configured to receive GNSS signals in a predetermined frequency band.
  • the predetermined frequency band may be the 1.2 GHz band or the 1.6 GHz band.
  • the 1.2 GHz band may be, for example, 1.226 GHz to 1.228 GHz
  • the 1.6 GHz band may be, for example, 1.559 GHz to 1.606 GHz
  • the antenna ANT may be configured to be capable of receiving SDARS (Satellite Digital Audio Radio Service) signals of the S band (2.320 GHz to 2.345 GHz) of the 2.3 GHz band.
  • SDARS Session Digital Audio Radio Service
  • the conductive layer 30 has a sheet resistance of 300 [ ⁇ / ⁇ (ohms per square)] or less, the gain of the antenna ANT is improved.
  • the sheet resistance of the conductive layer 30 is preferably 200 [ ⁇ / ⁇ ] or less, more preferably 100 [ ⁇ / ⁇ ] or less, and more preferably 80 [ ⁇ / ⁇ ]. ] or less is more preferable.
  • the lower limit of the sheet resistance of the conductive layer 30 may be higher than the sheet resistance of the conductive frame 70, for example, preferably 5 [ ⁇ / ⁇ ] or more, more preferably 10 [ ⁇ / ⁇ ] or more. Preferably, it is more preferably 15 [ ⁇ / ⁇ ] or more.
  • the upper limit of the sheet resistance of the conductive frame 70 is lower than the sheet resistance of the conductive layer 30.
  • it is preferably 2 [ ⁇ / ⁇ ] or less, more preferably 1 [ ⁇ / ⁇ ] or less, in terms of improving the gain of the antenna ANT.
  • the level of electrical resistance between the conductive frame 70 and the conductive layer 30 can be compared using, for example, the sheet resistance as an index.
  • the windowpane 101 can improve the gain of the antenna ANT when the conductive frame 70 is attached to the body part 62 at a distance that allows capacitive coupling to the body part 62 . This is because the high-frequency current generated around the conductive frame 70 flows into the vehicle body portion 62 through its capacitive coupling, and the area of the conductor region through which the high-frequency current flows is enlarged.
  • the coupling capacitance between the conductive frame 70 of the antenna ANT and the vehicle body portion 62 is 0.4 [pF] or more, the gain of the antenna ANT can be improved.
  • the lower limit of the coupling capacitance is preferably 1.0 [pF] or more, more preferably 2.0 [pF] or more.
  • the upper limit of the coupling capacitance is not specified, it can be set to 200 [pF] or less, for example.
  • the frame 61 of the window frame 63 has a portion coinciding with at least a portion of the outer edge 72 of the conductive frame 70 or a portion outside at least a portion of the outer edge 72 of the conductive frame 70 in plan view of the glass plate 10 . Having it improves the antenna gain of the antenna ANT. In the example shown in FIG. 1 , the entire portion of the frame 61 is outside the entire portion of the outer edge 72 in plan view of the glass plate 10 .
  • the facing distance between the frame 61 of the window frame 63 and the outer edge 72 of the conductive frame 70 is , 0 mm or more and 50 mm or less, the antenna gain of the antenna ANT is improved.
  • FIG. 4 is an enlarged view illustrating the overlapping of the conductive layer and the conductive frame in plan view.
  • the antenna gain of the antenna ANT is improved.
  • the conductive frame 70 at least partially overlaps the conductive layer 30 and the outer edge 72 of the conductive frame 70 is within 10 mm outside the outer edge 31 of the conductive layer 30 in plan view of the glass plate 10.
  • the antenna gain of the antenna ANT is improved.
  • the distance d between the outer edge 72 of the conductive frame 70 and the outer edge 31 of the conductive layer 30 is preferably 10 mm or less.
  • the distance d is preferably 5 mm or less. Note that the distance d is preferably 1 mm or more from the viewpoint of improving the antenna gain of the antenna ANT.
  • the antenna ANT Antenna gain is improved.
  • the distance between the inner edge 71 of the conductive frame 70 and the outer edge 31 of the conductive layer 30 is preferably 3 mm or less, more preferably 1 mm or less, and 0 mm. is most preferred.
  • the width of the conductive frame 70 can be set appropriately whether it overlaps with at least a part of the conductive layer 30 or not. Well, it may be 3 mm to 7 mm.
  • the half length (L/2) of the peripheral length L of the outer edge 72 of the conductive frame 70 is " ⁇ /4 ⁇ k ⁇ (2 ⁇ N-1)" is preferably substantially the same.
  • ⁇ is the wavelength in the air of the radio wave in the frequency band transmitted and received by the conductive frame 70 (antenna ANT)
  • k is the wavelength reduction rate determined by the glass plate 10 and the glass plate 20
  • N is 1 or more.
  • the half length (L/2) of the circumferential length L of the conductive frame 70 is " ⁇ /4 ⁇ k ⁇ ( 2 ⁇ N-1)" may not substantially match.
  • the windowpane 101 should be provided with a ground conductor portion 75 at a location away from the power supply portion 80, as shown in FIG.
  • the ground conductor portion 75 is an example of a ground conductor portion that is electrically connected to the conductive frame 70 and is equivalent to the ground potential.
  • the ground conductor portion 75 is, for example, a ground electrode electrically connected to a ground potential.
  • the ground conductor portion 75 may protrude outside the conductive frame 70 in plan view of the glass plate 10 . This makes it easy to bring a conductive member such as a lead wire electrically connecting the ground potential and the ground conductor portion 75 into contact with the ground conductor portion 75 .
  • the shape of the ground conductor portion 75 is preferably square, substantially square, rectangular, substantially rectangular, or any other square or polygonal shape for mounting, but is not limited to these, and may be circular, substantially circular, elliptical, substantially elliptical, or any other circular shape. Other shapes such as
  • FIG. 5 is a diagram illustrating two routes from the power supply section to the ground conductor section along the outer edge of the conductive frame.
  • D CW is the length of the first path from the power feeding portion 80 along the outer edge 72 to the ground conductor portion 75, and the length of the second path from the power feeding portion 80 along the outer edge 72 to the ground conductor portion 75. be DCCW .
  • the first path is a clockwise path from power feeder 80 and the second path is a counterclockwise path from power feeder 80 .
  • ⁇ be the wavelength in the air of radio waves in the frequency band transmitted and received by the antenna ANT
  • k be the wavelength reduction rate determined by the glass plate 10 and the glass plate 20 .
  • the antenna ANT can be widened.
  • ⁇ may be the wavelength in the air of radio waves of some frequencies included in a predetermined frequency band transmitted and received by the antenna ANT. Preferably, it may be the wavelength in the air of radio waves of all frequencies included in a predetermined frequency band. The same applies to ⁇ in the formulas described later.
  • the ground conductor portion 75 is preferably directly connected to the ground potential in terms of improving the antenna gain of the antenna ANT.
  • the ground conductor portion 75 is electrically connected to the vehicle body portion 62 such as the window frame 63 by direct coupling, and is directly connected to the ground potential.
  • the ground conductor portion 75 may be electrically connected to the ground potential by capacitive coupling.
  • the antenna device 201 is provided with coils 114 and 115 between the conductive layer 30 and the power supply 111 for attenuating signals in the frequency band transmitted and received by the antenna ANT, leakage of the signals to the power supply 111 can be suppressed. , the decrease in the antenna gain of the antenna ANT can be suppressed.
  • coil 114 is inserted in series between conductive film 124 and power source 111
  • coil 115 is inserted in series between conductive film 125 and power source 111 .
  • the inductance of the coils 114 and 115 may be 2.0 ⁇ H or less, or 1.6 ⁇ H or less, depending on the area of the light control film 120 . If the inductance of the coils 114 and 115 is within any of the above ranges, signals in the VHF to UHF frequency band can be attenuated.
  • FIG. 6 is a diagram illustrating two routes from the power supply portion 80 to the connection portion 126 along the outer edge 72 of the conductive frame 70.
  • a connection portion 126 is a portion of the conductive layer 30 that is connected to the voltage control portion 110 .
  • the "portion connected to the voltage control unit 110" includes the electrical length of the signal transmitted and received by the antenna ANT considering the length of the feeder line (harness) from the conductive layer 30 to the coils 114 and 115. good too.
  • L CW is the clockwise path length from feed 80 along outer edge 72 to connection 126
  • L CCW is the counterclockwise path length from feed 80 along outer edge 72 to connection 126 .
  • ⁇ be the wavelength in air of radio waves in the frequency band transmitted and received by the antenna ANT
  • k be the wavelength shortening rate determined by the glass plate 10 and the glass plate 20
  • N1 and N2 be integers of 1 or more.
  • Equation 5b It is preferable to satisfy at least one of More preferably, both Equations 5a and 5b are satisfied.
  • the windowpane 101 may have a (frame-shaped) light shielding portion (not shown) provided directly or indirectly on the main surface 11 of the glass plate 10 .
  • the light shielding part is, for example, a light shielding film that shields visible light.
  • Specific examples of the light shielding film include ceramics such as a black ceramics film.
  • the light shielding portion overlaps at least a portion of the conductive frame 70 in plan view of the glass plate 10 . As a result, when the windowpane 101 is viewed from the Z-axis direction (outside or inside the vehicle), the overlapped portion becomes difficult to see, so the appearance of the windowpane 101 and the design of the vehicle is improved.
  • FIG. 7 is an exploded perspective view showing one configuration example of the vehicle antenna device of the second embodiment.
  • An antenna device 202 of the second embodiment includes a windowpane 102 for a vehicle.
  • the windowpane 102 differs from the windowpane 101 of the first embodiment in that a conductive layer 130 having an electrical resistance lower than that of the conductive layer 30 is provided between the intermediate film 40A and the glass plate 10 .
  • Conductive layer 130 is an example of a second conductive layer.
  • window frame 63 may have a light shielding portion as in the first embodiment.
  • the conductive layer 130 is a planar conductor arranged directly or indirectly on the main surface 11 of the glass plate 10 .
  • the conductive layer 130 may be a conductor in contact with the main surface 11 or a conductor arranged on the main surface 11 side via a transparent or translucent dielectric (not shown).
  • Conductive layer 130 may be transparent or translucent.
  • Specific examples of the conductive layer 130 include a metal film such as an Ag (silver) film, a metal oxide film such as an ITO (indium tin oxide) film, a resin film containing conductive fine particles, or a laminate of a plurality of types of films. body, etc.
  • the conductive layer 130 may be coated with a resin film such as polyethylene terephthalate by vapor deposition or the like.
  • the conductive layer 130 may be a mesh formed on a film by conductive ink or etching.
  • the conductive layer 130 may be a conductive film coated on the main surface 11 of the glass plate 10 .
  • a specific example of the conductive film is a low emissivity film such as a Low-E (Low Emissivity) film that exhibits low emissivity performance.
  • Low radiation refers to reducing heat transfer by radiation.
  • a low-emissivity film such as a Low-E film secures heat insulation by suppressing heat transfer by radiation.
  • the low emissivity film may be conventional.
  • the low emissivity film may be, for example, a laminated film including a transparent dielectric film, an infrared reflective film, and a transparent dielectric film in this order.
  • Metal oxides and metal nitrides are typical transparent dielectric films. Typical metal oxides are zinc oxide and tin oxide.
  • a metal film is typical of the infrared reflective film.
  • Silver (Ag) is representative of the metal film.
  • one or more infrared reflective films may be formed between the transparent dielectric films.
  • the conductive layer 130 is not limited to a low-emissivity film such as a Low-E film, and may have other functions as long as it is a conductive layer.
  • the conductive layer 130 may have functions such as anti-icing and anti-fogging of the window glass 102 due to heat generated by voltage application.
  • the sheet resistance of the conductive layer 130 is preferably less than 5 [ ⁇ / ⁇ ], more preferably less than 4 [ ⁇ / ⁇ ], and even more preferably less than 3 [ ⁇ / ⁇ ] in terms of improving the gain of the antenna ANT.
  • the lower limit of the sheet resistance of the conductive layer 130 is not particularly limited, and is greater than 0 [ ⁇ / ⁇ ].
  • the outer edge 131 of the conductive layer 130 When the outer edge 131 of the conductive layer 130 is outside the outer edge 31 of the conductive layer 30 in plan view of the glass plate 10, the area covered by the functions such as low radiation performance of the conductive layer 130 can be expanded. However, in plan view of the glass plate 10 , the outer edge 131 of the conductive layer 130 may coincide with or be inside the outer edge 31 of the conductive layer 30 .
  • the conductive layer 130 overlaps the conductive frame 70, the conductive layer 130 and the conductive frame 70 are capacitively coupled, making it easier to ensure the gain of the antenna ANT.
  • the conductive layer 130 does not have to overlap the conductive frame 70 in plan view of the glass plate 10 .
  • the conductive layer 130 is shown as a conductor in contact with the main surface 11 of the glass plate 10 .
  • the conductive layer 130 may be arranged without being in contact with the main surface 14 of the glass plate 20 instead of being in contact with the main surface 11 of the glass plate 10 .
  • the conductive layer 130 may be arranged between the main surface 14 of the glass plate 20 and the conductive frame 70 . Also in this case, it is sufficient that the electrical resistance of the conductive frame 70 is lower than the electrical resistance of the conductive layer 130 .
  • the conductive layer 130 the low emissivity film described above can be exemplified.
  • the conductive layer 130 is shown as a conductor in contact with the main surface 11 of the glass plate 10.
  • Another conductive layer (third conductive layer) (not shown) may be arranged indirectly or indirectly. Also in this case, it is sufficient that the electrical resistance of the conductive frame 70 is lower than the electrical resistance of the third conductive layer.
  • the third conductive layer is a low emissivity film and the conductive layer 130 is an infrared reflective film can be exemplified.
  • FIG. 8 is an exploded perspective view showing one configuration example of the vehicle antenna device of the third embodiment.
  • An antenna device 203 of the third embodiment includes a vehicle window glass 103 .
  • the windowpane 103 differs from the windowpane 101 of the first embodiment in that it does not include the conductive frame 70 but includes the conductive layer 130 .
  • the windowpane 103 may have a light shielding portion, as in the first embodiment.
  • the windowpane 103 is a laminated glass comprising a glass plate 10, a glass plate 20, a conductive layer 30, an intermediate film 40, a conductive layer 130 and a power supply portion 180 as its main configuration.
  • the conductive layer 130 is arranged between the intermediate film 40A and the glass plate 10 and has a lower electrical resistance than the conductive layer 30.
  • the sheet resistance of the conductive layer 130 is preferably less than 5 [ ⁇ / ⁇ ], more preferably less than 4 [ ⁇ / ⁇ ], and more preferably less than 3 [ ⁇ / ⁇ ] in terms of improving the gain of the antenna ANT. ] is more preferable.
  • the lower limit of the sheet resistance of the conductive layer 130 is not particularly limited, and is greater than 0 [ ⁇ / ⁇ ].
  • the power supply part 180 is electrically connected to the conductor region 132 of the conductive layer 130 outside the conductive layer 30 in plan view of the glass plate 10 .
  • a dielectric such as the glass plate 20 is interposed between the power feeding portion 180 and the conductor region 132, so the power feeding portion 180 is electrically connected to the conductor region 132 by capacitive coupling.
  • the form or position of the power supply section 180 may be the same as the above-described form or position of the power supply section 80 of the first embodiment.
  • the intermediate film 40A is interposed between the conductive layer 130 and the conductive layer 30, the conductive region 132 outside the conductive layer 30 in the plan view of the glass plate 10 in the conductive layer 130 is 30 by capacitive coupling. Therefore, by attaching the window glass 103 to the conductive window frame 63, the conductive layer 30 and the conductive layer 130 can function as antenna conductors of the patch antenna, and the vehicle body portion 62 and the window frame 63 can function as patch antennas. can serve as the ground for Since the conductive layer 30 and the conductive layer 130 function as antenna conductors, the high-frequency current generated in the conductive region 132 outside the conductive layer 30 in the plan view of the glass plate 10 in the conductive layer 130 is transferred to the conductive region 132.
  • a sheet resistance value (unit: ⁇ / ⁇ ) is given as an index for evaluating the level of the “electrical resistance” referred to here.
  • the conductive layer 130 functions as part of a slot antenna using the gap between the conductor region 132 and the window frame 63 as a slot.
  • the conductive layer 30 is (a conductive film contained in) a light control film and the conductive layer 130 is an infrared reflective film is exemplified.
  • the conductive layer 30 and the conductive layer 130 each function as part of a patch antenna that transmits and receives radio waves in a predetermined frequency band.
  • the conductive layer 130 functions as part of a slot antenna that transmits and receives radio waves in a predetermined frequency band. Therefore, even if the conductive layer 30 having relatively high electrical resistance is used, it is possible to provide the antenna device 203 capable of transmitting and receiving radio waves in a predetermined frequency band with high gain.
  • An antenna using the conductive layer 130 is hereinafter referred to as an antenna ANT2.
  • the antenna ANT2 operates with the feeding section 180 as a feeding point.
  • Antenna ANT2 has the same function as antenna ANT described above unless otherwise noted.
  • the power supply portion 180 is located on the opposite side of the main surface 11 of the glass plate 10 with respect to the glass plate 20, and overlaps at least a part of the conductor region 132 in plan view of the glass plate 10. , is capacitively connected to the conductor region 132 .
  • the power feeding portion 180 is electrically connected to the conductor region 132 by capacitive coupling by overlapping at least part of the projection region 170 projected onto the glass plate 20 with the conductor region 132 .
  • the inner edge 171 of the projected area 170 of the conductor area 132 matches the inner edge 133 of the conductor area 132 (the outer edge 31 of the conductive layer 30).
  • the intermediate film 40 has a thickness of about 1 mm and the glass plate 20 has a thickness of about 2 mm.
  • the outer edge 131 of the conductive layer 130 is located outside the outer edge 31 of the conductive layer 30 when the glass plate 10 is viewed in plan, and the conductor region 132 is located outside the conductive layer 132 when the glass plate 10 is viewed in plan.
  • a frame-shaped region 130 does not overlap with the conductive layer 30 . Since the conductor area 132 is such a frame-shaped area, the antenna gain of the antenna ANT2 is improved.
  • the half length (L/2) of the circumferential length L of the outer edge 131 of the conductor region 132 is " ⁇ /4 ⁇ k ⁇ (2 ⁇ N-1)" is preferably substantially the same.
  • ⁇ is the wavelength in air of radio waves in the frequency band transmitted and received by the conductor region 132 (antenna ANT2)
  • k is the wavelength reduction rate determined by the glass plate 10 and the glass plate 20
  • N is 1 or more. be an integer.
  • the half length (L/2) of the circumferential length L of the conductor region 132 is " ⁇ /4 ⁇ k ⁇ ( 2 ⁇ N-1)" may not substantially match.
  • the windowpane 103 should be provided with a ground conductor portion 175 at a location away from the power supply portion 180, as shown in FIG.
  • the ground conductor portion 175 is an example of a ground conductor portion electrically connected to the conductor region 132 and equivalent to the ground potential.
  • the ground conductor portion 175 is, for example, a ground electrode electrically connected to a ground potential.
  • the ground conductor portion 175 may protrude outside the conductor region 132 in plan view of the glass plate 10 . According to this aspect, it becomes easy to bring a conductive member such as a lead wire electrically connecting the ground potential and the ground conductor portion 175 into contact with the ground conductor portion 175 .
  • the shape of the ground conductor portion 175 is preferably a rectangular shape such as a square, a substantially square, a rectangle, a substantially rectangular shape, or a polygonal shape for mounting, but is not limited to these, and may be a circular shape such as a circle, substantially a circle, an ellipse, or a substantially ellipse. Other shapes such as
  • the clockwise path length from the power supply portion 180 to the ground conductor portion 175 along the outer edge 131 of the conductor region 132 is D CW
  • the length from the power supply portion 180 along the outer edge 131 is D CW
  • the counterclockwise path length up to the ground conductor portion 175 is assumed to be DCCW .
  • ⁇ be the wavelength in air of radio waves in the frequency band transmitted and received by the antenna ANT2
  • k be the wavelength reduction rate determined by the glass plate 10 and the glass plate 20.
  • the power supply portion 180 is positioned on the side opposite to the main surface 11 of the glass plate 10 with respect to the glass plate 20, and overlaps at least a part of the conductor region 132 in plan view of the glass plate 10. It is electrically connected to the conductor region 132 by capacitive coupling. Due to this capacitive coupling, the DCW or DCCW has a length (specifically, an odd multiple of ⁇ /4 ⁇ k ), resonance is obtained between the feed section 180 and the ground conductor section 175 .
  • M 1 and M 2 are integers of 1 or more, considering manufacturing errors such as ⁇ /5 ⁇ k, ⁇ /4 ⁇ k ⁇ (2 ⁇ M 1 ⁇ 1) ⁇ /5 ⁇ k ⁇ DCW ⁇ /4 ⁇ k ⁇ (2 ⁇ M 1 ⁇ 1 )+ ⁇ /5 ⁇ k Formula 7a, ⁇ /4 ⁇ k ⁇ (2 ⁇ M 2 ⁇ 1) ⁇ /5 ⁇ k ⁇ D CCW ⁇ /4 ⁇ k ⁇ (2 ⁇ M 2 ⁇ 1 )+ ⁇ /5 ⁇ k ...Equation 7b, satisfies at least one of the above, the antenna gain of the antenna ANT2 is improved. It is preferable to satisfy both equations 7a and 7b.
  • the DCW is different from the DCCW (when DCW ⁇ DCCW is established)
  • the most resonant frequency will be different between the DCW and the DCCW , so that the antenna ANT2 can be widened.
  • connection section 126 the portion of the conductive layer 30 connected to the voltage control section 110 is referred to as a connection section 126 .
  • the clockwise path length from the power supply portion 180 to the connection portion 126 along the outer edge 131 of the conductor region 132 is L CW , and from the power supply portion 180 to the connection portion 126 along the outer edge 131.
  • L-- CCW be the counterclockwise path length to the end.
  • ⁇ be the wavelength in air of radio waves in the frequency band transmitted and received by the antenna ANT2
  • k be the wavelength shortening rate determined by the glass plate 10 and the glass plate 20
  • N1 and N2 be integers of 1 or more.
  • the effect of the feeder connecting the connection unit 126 and the voltage control unit 110 on the antenna gain of the antenna ANT2 can be suppressed.
  • At least one of the above formulas 5a and 5b is preferably satisfied, and at least one of the above formulas 6a and 6b is more preferably satisfied.
  • the frame-shaped conductor region 132 has a closed loop shape, a high-frequency current can easily flow through the conductor region 132, thereby improving the antenna gain of the antenna ANT2.
  • a portion of the conductor region 132 may have a notch.
  • the shape of the conductor region 132 is not limited to a substantially rectangular shape, and may be another polygonal shape such as a substantially triangular shape.
  • the antenna gain for both the horizontally polarized wave and the vertically polarized wave is improves. That is, in a plan view of the glass plate 10, the power supply portion 180 is located within 1 ⁇ 3 of the length L X of the first side of the frame-shaped conductor region 132 from the corner of the frame-shaped conductor region 132, or It is preferable to arrange it within 1 ⁇ 3 of the length LY of the second side of the conductor region 132 from the corner of the conductor region 132 .
  • FIG. 9 is a plan view of a simulation model of the vehicle antenna device according to the present disclosure.
  • the conditions such as the dimensions of each part of the simulation model are Window frame 63: Ground plane of length 2000 [mm] x width 2000 [mm] Opening of window frame 63: length 460 [mm] x width 600 [mm] Outer edge of conductive frame 70: length 450 [mm] x width 590 [mm] Inner edge of conductive frame 70: length 430 [mm] x width 570 [mm] External shape of light control film 120: length 450 [mm] x width 590 [mm] Thickness of window frame 63: 0.1 [mm] Each thickness of the glass plates 10 and 20: 2.1 [mm] Total thickness of intermediate films 40A and 40B: 0.8 [mm] Each thickness of resin substrates 121 and 122: 0.1 [mm] Thickness of dimming layer 123: 0.2 [mm] Sheet resistance of conductive layer 30 (conductive films 124 and 125): 15 [ ⁇ / ⁇ ] Sheet resistance of conductive frame
  • FIG. 10 shows the clockwise path length D CW from the power supply portion 80 to the ground conductor portion 75 along the outer edge 72 of the conductive frame 70 in the vehicle antenna device of the first embodiment (see FIGS. 1 and 2).
  • FIG. 10 is a diagram showing an example of a simulation result of the reflection coefficient S11 for .
  • the horizontal axis of FIG. 10 is a value obtained by normalizing the path length DCW with the wavelength of each frequency (170 MHz, 205 MHz, 240 MHz) included in the DAB Band III band.
  • FIG. 11 shows a counterclockwise path length D from the power supply portion 80 to the ground conductor portion 75 along the outer edge 72 of the conductive frame 70 in the vehicle antenna device (see FIGS. 1 and 2) of the first embodiment.
  • FIG. 10 is a diagram showing an example of a simulation result of reflection coefficient S11 for CCW ;
  • the horizontal axis of FIG. 11 is a value obtained by normalizing the path length DCCW with the wavelength of each frequency (170 MHz, 205 MHz, 240 MHz) included in the DAB Band III band.
  • Table 1 shows an example of simulation results of the average antenna gain when the antenna device 201 (see FIG. 2) of the first embodiment that satisfies Equations 1a and 1b is applied to the side glass. As shown in Table 1, an antenna gain suitable for receiving radio waves in the DAB Band III band was obtained.
  • Table 2 shows an example of simulation results of the average antenna gain when the antenna device 202 (see FIG. 7) of the second embodiment that satisfies Equations 1a and 1b is applied to the side glass. As shown in Table 2, an antenna gain suitable for receiving radio waves in the DAB Band III band was obtained. In particular, the antenna gain for vertically polarized waves is improved compared to the antenna device 201 (Table 1) of the first embodiment.
  • FIG. 12 shows, in the vehicle antenna device of the third embodiment (see FIG. 8), the clockwise rotation from the feeding portion 180 to the ground conductor portion 175 along the outer edge 131 of the conductor region 132 in plan view of the glass plate 10.
  • 11 is a diagram showing an example of a simulation result of the reflection coefficient S11 with respect to the path length DCW of .
  • the horizontal axis of FIG. 12 is the normalized value of the path length DCW at the wavelength of 205 MHz frequency included in the DAB Band III band.
  • FIG. 13 shows a counterclockwise direction from the power supply portion 180 to the ground conductor portion 175 along the outer edge 131 of the conductor region 132 in plan view of the glass plate 10 in the vehicle antenna device of the third embodiment (see FIG. 8).
  • FIG. 10 is a diagram showing an example of simulation results of the reflection coefficient S11 with respect to the circumference path length D CCW ;
  • the horizontal axis of FIG. 13 is the normalized value of the path length D CCW at the wavelength of 205 MHz frequency included in the DAB Band III band.
  • Table 3 shows an example of simulation results of the average antenna gain when the antenna device 203 (see FIG. 8) of the third embodiment that satisfies Equations 7a and 7b is applied to the side glass. As shown in Table 3, an antenna gain suitable for receiving radio waves in the DAB Band III band was obtained.
  • the first dielectric plate or the second dielectric plate is not limited to a glass plate, and may be another dielectric plate such as a resin plate.
  • the entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2021-135879 filed on August 23, 2021 are cited here as disclosure of the specification of the present invention. , is to be incorporated.

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Abstract

La présente invention est dotée de la fonction d'une antenne et d'une autre fonction électrique différente de celle d'une antenne.　L'invention concerne un appareil d'antenne de véhicule comprenant une première plaque diélectrique ayant une surface principale ; une seconde plaque diélectrique disposée directement ou indirectement sur la surface principale de la première plaque diélectrique ; une première couche électroconductrice disposée entre un premier film intermédiaire et un second film intermédiaire entre la première plaque diélectrique et la seconde plaque diélectrique ; un cadre électroconducteur disposé entre la première plaque diélectrique et le premier film intermédiaire, entre la seconde plaque diélectrique et le second film intermédiaire, ou sur le côté opposé à la surface principale par rapport à la seconde plaque diélectrique, le cadre électroconducteur ayant un bord interne suivant un bord externe de la première couche électroconductrice dans une vue en plan de la première plaque diélectrique ; une unité d'alimentation électrique connectée électriquement au cadre électroconducteur ; et une unité de commande de tension connectée électriquement à la première couche électroconductrice, l'unité de commande de tension comprenant une alimentation électrique et commandant une tension appliquée à la première couche électroconductrice. Le cadre électroconducteur présente une résistance électrique inférieure à celle de la première couche électroconductrice, et fonctionne comme une partie d'une antenne pour émettre et recevoir une onde radio dans une bande de fréquence prescrite.
PCT/JP2022/031194 2021-08-23 2022-08-18 Appareil d'antenne de véhicule WO2023026949A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63271320A (ja) * 1987-04-30 1988-11-09 Central Glass Co Ltd 調光ガラス
JP2022117929A (ja) * 2021-02-01 2022-08-12 Ａｇｃ株式会社 車両用窓ガラス及び車両用窓ガラス装置

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Publication number Priority date Publication date Assignee Title
CN112334427B (zh) 2018-06-28 2023-06-13 日本板硝子株式会社 汽车用夹层玻璃
JP7440294B2 (ja) 2020-02-28 2024-02-28 株式会社東海理化電機製作所 車両制御システム及び車両制御方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63271320A (ja) * 1987-04-30 1988-11-09 Central Glass Co Ltd 調光ガラス
JP2022117929A (ja) * 2021-02-01 2022-08-12 Ａｇｃ株式会社 車両用窓ガラス及び車両用窓ガラス装置

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