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WO2024117114A1 - Dispositif d'antenne - Google Patents

Dispositif d'antenne Download PDF

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Publication number
WO2024117114A1
WO2024117114A1 PCT/JP2023/042492 JP2023042492W WO2024117114A1 WO 2024117114 A1 WO2024117114 A1 WO 2024117114A1 JP 2023042492 W JP2023042492 W JP 2023042492W WO 2024117114 A1 WO2024117114 A1 WO 2024117114A1
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WO
WIPO (PCT)
Prior art keywords
antenna device
antenna
earth
conductor
electrode
Prior art date
Application number
PCT/JP2023/042492
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English (en)
Japanese (ja)
Inventor
聡史 船津
諭 徳永
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
Publication of WO2024117114A1 publication Critical patent/WO2024117114A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • 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

Definitions

  • This disclosure relates to an antenna device.
  • This disclosure provides an antenna device that can ensure antenna gain with a simple antenna element.
  • An antenna device that is installed in a vehicle and is capable of receiving radio waves in a predetermined frequency band, a feeding electrode to which a signal line of the transmission line is electrically connected; an antenna element electrically connected to the feeding electrode; a ground conductor including a ground electrode to which the ground conductor of the transmission line is electrically connected; a reactance between the earth conductor and a metal body of the vehicle is greater than or equal to ⁇ 50 ⁇ and less than or equal to +50 ⁇ in the frequency band; An antenna device is provided that does not have a linear earth element extending from one end connected to the earth electrode to the other end that is not connected to any other conductor.
  • FIG. 1 is a diagram illustrating a configuration example of an antenna device according to an embodiment of the present invention in a plan view of a window glass.
  • FIG. 2 is a plan view showing an example of a connection between a coaxial cable and an antenna.
  • FIG. 2 is a partial plan view of a configuration example of the antenna device according to the first embodiment; 1 is a partial cross-sectional view of a configuration example of an antenna device according to a first embodiment.
  • FIG. 4 is a plan view showing a first modified example of the antenna device of the first embodiment.
  • FIG. 4 is a plan view showing a second modified example of the antenna device of the first embodiment.
  • FIG. 11 is a partial plan view of a configuration example of an antenna device according to a second embodiment.
  • FIG. 11 is a partial cross-sectional view of a configuration example of an antenna device according to a second embodiment. This figure shows the results of a simulation of the relationship between the element length Ha shown in Figure 3 and the maximum element length L in the DAB Band III band.
  • 4 is a diagram showing the results of a simulation of the relationship between the element length Ha shown in FIG. 3 and the maximum element length L in the band of terrestrial digital television broadcast waves.
  • FIG. FIG. 4 is a diagram showing the results of a simulation of the relationship between the element length Ha shown in FIG. 3 and the maximum element length L in the FM broadcast wave band.
  • the X-axis direction, Y-axis direction, and Z-axis direction are mutually perpendicular.
  • the XY plane, YZ plane, and ZX plane respectively represent imaginary planes parallel to the X-axis direction and the Y-axis direction, imaginary planes parallel to the Y-axis direction and the Z-axis direction, and imaginary planes parallel to the Z-axis direction and the X-axis direction.
  • vehicle window glass examples include rear glass attached to the rear of the vehicle, windshield attached to the front of the vehicle, side glass attached to the side of the vehicle, and roof glass attached to the roof of the vehicle.
  • Vehicle window glass is not limited to these examples, and may be, for example, a window glass in which the roof glass is integrated with either or both of the windshield or rear glass.
  • FIG. 1 is a schematic diagram showing an example of the configuration of an antenna device according to an embodiment, viewed from above on a window glass.
  • the antenna device 100 shown in FIG. 1 is an example of a vehicle antenna device provided in a vehicle, and in the illustrated example, is provided on a window glass 1 for the vehicle.
  • the antenna device 100 includes an antenna 10 capable of receiving radio waves in a specified frequency band F.
  • the antenna device 100 is a vehicle antenna device capable of receiving radio waves in a specified frequency band F by the antenna 10.
  • the antenna 10 may be an antenna capable of transmitting and receiving radio waves of a specified frequency band F. Transmitting and receiving means performing both transmission and reception. Receiving (or transmitting and receiving) radio waves of frequency band F may mean receiving (or transmitting and receiving) radio waves of a portion of frequency band F, or receiving (or transmitting and receiving) radio waves of the entire frequency band F.
  • Frequency band F is, for example, the UHF (Ultra High Frequency) band with frequencies from 300 MHz to 3 GHz, the VHF (Very High Frequency) band with frequencies from 30 MHz to 300 MHz, or a band spanning both.
  • Specific examples of frequency bands included in the UHF band include the band of terrestrial digital television broadcast waves (e.g., 470 MHz to 710 MHz).
  • Specific examples of frequency bands included in the VHF band include the band of FM broadcast waves (e.g., 76 MHz to 108 MHz) and the DAB Band III band (e.g., 170 MHz to 240 MHz).
  • the window glass 1 is an example of a dielectric plate mounted on a vehicle, and more specifically, an example of a glass plate mounted on a vehicle.
  • the antenna device 100 or the antenna 10 may be provided on the window glass 1 or in its vicinity, or may be provided on a dielectric plate different from the window glass 1 or in its vicinity.
  • the dielectric plate or its vicinity on which the antenna device 100 or antenna 10 is provided is not limited to the window glass 1 as shown in the figure, but may also be a plastic body, a spoiler, a bumper, etc.
  • the antenna device 100 or antenna 10 may be provided on the surface of the window glass 1 (e.g., the surface on the inside of the vehicle).
  • the antenna device 100 or antenna 10 may be provided on the window glass 1 in a form in which the window glass 1 is enclosed in laminated glass in which a resin layer is sandwiched between two glass plates.
  • the vicinity of the window glass 1 where the antenna device 100 or antenna 10 is provided includes, for example, the interior of the vehicle, located within 100 mm from the surface of the window glass 1.
  • the vicinity of the window glass 1 is not limited to the interior of the vehicle, but may be outside the vehicle, located within 100 mm from the surface of the window glass 1.
  • Specific examples of the vicinity of the window glass 1 include vehicle side locations located away from the window glass 1, such as the roof, console, pillar, garnish, and mirror.
  • the antenna device 100 or antenna 10 may be provided near the window glass 1 in a form in which the antenna 10 is attached to a member attached to the window glass 1 or in its vicinity.
  • the antenna device 100 or antenna 10 may be arranged so that it partially or completely overlaps the light-shielding film 5 formed on the periphery of the window glass 1 in a plan view of the window glass 1, or so that it partially or completely overlaps the light-shielding film 5.
  • a specific example of the light-shielding film 5 is ceramics such as a black ceramic film.
  • the antenna device 100 or antenna 10 is not limited to being provided along the upper glass edge 1a of the window glass 1 (in other words, the upper edge of a window frame, not shown, to which the window glass 1 is attached) as shown in the figure.
  • the antenna 10 may be provided along any of the lower glass edge 1b (the lower edge of the window frame) of the window glass 1, the left glass edge 1c (the left edge of the window frame) of the window glass 1, or the right glass edge 1d (the right edge of the window frame) of the window glass 1.
  • the antenna device 100 has an earth conductor 18 for earthing the antenna 10.
  • the antenna 10 has a power supply electrode 16, an antenna element 13, and an earth electrode 17.
  • the earth electrode 17 is a part included in the earth conductor 18.
  • the positional relationship and shape of the power supply electrode 16, antenna element 13, and earth electrode 17 are not limited to the example in FIG. 1.
  • the positional relationship between the power supply electrode 16 and earth electrode 17 may be opposite to that in the example in FIG. 1.
  • the direction in which the antenna element 13 extends may be different from that in the example in FIG. 1.
  • the shapes of the power supply electrode 16 and earth electrode 17 are not limited to rectangular, and may be other shapes such as circular.
  • the feeding electrode 16 is electrically connected to a signal line 51 of a transmission line 50 such as a coaxial cable.
  • the antenna element 13 is electrically connected to the feeding electrode 16.
  • the earth conductor 18 includes an earth electrode 17. In the example of FIG. 1, the linear earth element is not connected to the earth electrode 17.
  • the earth electrode 17 is electrically connected to a ground conductor 52 of the transmission line 50 (e.g., the outer conductor of a coaxial cable).
  • FIG. 2 is a plan view showing an example of a connection between the coaxial cable 53 and the antenna 10.
  • the coaxial cable 53 is an example of a transmission line.
  • a connector 40 for connecting the coaxial cable 53 and the antenna 10 may be attached to the power supply electrode 16 and the earth electrode 17.
  • the signal line of the coaxial cable 53 is electrically connected to the power supply electrode 16 by the connector 40
  • the outer conductor of the coaxial cable 53 is electrically connected to the earth electrode 17 by the connector 40.
  • the antenna device 100 may have an amplifier 41 mounted on a dielectric plate such as the window glass 1 or the dielectric layer 19 described below.
  • the amplifier 41 may be an integral part with the connector 40 or a separate part from the connector 40.
  • FIG. 2 illustrates an example in which the amplifier 41 is an integral part built into the connector 40.
  • the input terminal 42 of the amplifier 41 may be electrically connected to the power supply electrode 16, the earth terminal 43 of the amplifier 41 may be electrically connected to the earth electrode 17, and the output terminal 44 of the amplifier 41 may be electrically connected to the signal line of the coaxial cable 53.
  • a DC blocking capacitor may also be interposed between the internal ground of the amplifier 41 and the earth terminal 43.
  • FIG. 3 is a partial plan view of an example of the configuration of the antenna device of the first embodiment.
  • FIG. 4 is a partial cross-sectional view of an example of the configuration of the antenna device of the first embodiment.
  • the antenna device 101 is an example of the configuration of the antenna device 100 described above.
  • 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 body 62 is an example of a metal body of a vehicle.
  • the flange 66 is a metal part that faces the metal body of the vehicle, and is also called a window frame.
  • the window glass 1 has a main surface 2 (an example of a first main surface) facing the negative side in the Z-axis direction, and a main surface 3 (an example of a second main surface facing the opposite side to the first main surface) facing the positive side in the Z-axis direction.
  • the window glass 1 is attached to a flange 66, for example, by bonding the peripheral edge of the main surface 3 to the flange 66 with an adhesive 65 such as urethane resin.
  • the flange 66 has a metal part 63 that faces at least a part of the peripheral edge of the main surface 3 in a plan view of the window glass 1 from the Z-axis direction.
  • the window glass 1 is an example of a glass sheet for a vehicle, and is a plate-shaped body whose main component is a dielectric material such as glass.
  • the antenna element 13, the power supply electrode 16, the earth electrode 17 and the extension conductor 31 are provided on the same plane, and in this example, are formed on the main surface 3 of the window glass 1.
  • the antenna element 13 shown in FIG. 3 is an L-shaped linear conductor, but is not limited to an L-shape.
  • the antenna element 13 may be any shape having one or more open ends, including a T-shape, a loop shape, a folded or branched shape. Note that a T-shape may be considered to include an L-shape.
  • the antenna element 13 may be a shape (pattern) in which multiple linear conductors extend in any direction from the power supply electrode 16. In the example of FIG. 3, the antenna element 13 is a single line extending from the power supply electrode 16, and is a single line having a single open end 13a.
  • the power supply electrode 16 is a rectangular planar conductor.
  • the earth conductor 18 includes an earth electrode 17 and an extension conductor 31.
  • the earth electrode 17 is a rectangular planar conductor.
  • the extension conductor 31 is a linear or planar conductor extending from the earth electrode 17.
  • the extension conductor 31 is an L-shaped conductor including a conductor portion 31a extending from the earth electrode 17 toward the positive side in the Y-axis direction, and a conductor portion 31b connected to the conductor portion 31a.
  • the extension conductor 31 may be of other shapes, such as a T-shape.
  • the conductor portion 31b extends in the X-axis direction along the inner edge 64 of the metal portion 63.
  • the adhesive 65 is a dielectric layer interposed between the extended conductor 31 and the metal portion 63.
  • the adhesive 65 is interposed between the conductor portion 31b of the extended conductor 31 and the mounting surface of the metal portion 63, and the adhesive 65 forms a capacitive coupling between the conductor portion 31b and the metal portion 63.
  • a dielectric layer different from the adhesive 65 may be further included between the extended conductor 31 and the metal portion 63.
  • the conductor portion 31b of the extended conductor 31 may also be electrically connected to the metal portion 63 without the adhesive 65, in which case the reactance between the earth conductor 18 and the metal portion 63 is approximately zero.
  • reactance Xr the reactance between the earth conductor 18 and the metal part 63 is defined as reactance Xr.
  • reactance Xr may be defined as the reactance between the extension conductor 31 included in the earth conductor 18 and the mounting surface of the metal part 63.
  • reactance Xr is -50 ⁇ or more and +50 ⁇ or less in frequency band F
  • the earth electrode 17 included in the earth conductor 18 is stably grounded to the metal part 63. This prevents a decrease in the antenna gain of the antenna 10 even if the length Lg of the outer conductor of the coaxial cable 53 from the earth electrode 17 to the intermediate earth point 54 (see Figure 2) varies. As a result, the antenna gain of the antenna device 101 is ensured.
  • reactance Xr is preferably -40 ⁇ or more and +40 ⁇ or less in frequency band F, and more preferably -30 ⁇ or more and +30 ⁇ or less.
  • intermediate earth point 54 is the point where the outer conductor of coaxial cable 53 is earthed to metal vehicle body 62 at the midpoint of coaxial cable 53.
  • the length Lg of the outer conductor of coaxial cable 53 from earth electrode 17 to intermediate earth point 54 varies depending on the vehicle specifications and variations between individual vehicles. If the length Lg changes, there is a risk that the resonance length of antenna 10 will also change. However, in this embodiment, since earth electrode 17 is stably earthed to metal part 63, the effect on resonance of antenna 10 is reduced, and therefore a decrease in antenna gain of antenna 10 is suppressed even if length Lg varies. Note that intermediate earth point 54 can also be omitted.
  • the antenna device 100 may include an inductor 45 that is connected in series to the antenna element 13 and has one end electrically connected to the power feeding electrode 16. By providing the inductor 45, the antenna device 100 can reduce the size of the antenna 10.
  • the inductor 45 may be inserted in series in the middle of the antenna element 13, between the antenna element 13 and the power feeding electrode 16, between the power feeding electrode 16 and the input terminal 42 of the amplifier 41, or in series in the input section on the board on which the amplifier 41 is mounted.
  • the inductor 45 is, for example, a coil element.
  • the earth electrode 17 is stably grounded to the metal part 63, so the antenna device 101 does not need to have a linear earth element extending from one end connected to the earth electrode 17 to the other end not connected to other conductors.
  • the potential of the earth electrode 17 approaches the potential of the metal part 63, so that common mode noise passing through the earth electrode 17 can be suppressed. This suppresses a decrease in the antenna gain of the antenna 10.
  • the antenna device 101 has a reactance Xr of -50 ⁇ or more and +50 ⁇ or less in frequency band F and does not have a linear earth element extending from one end connected to the earth electrode 17 to the other end not connected to other conductors, so that the antenna gain can be ensured with a simple antenna element.
  • a linear earth element that extends from one end connected to earth electrode 17 to the other end not connected to other conductors refers to an element that extends from earth electrode 17 as a starting point and whose tip is not connected to other conductors.
  • the extended conductor 31 illustrated in FIG. 3 is not a linear earth element that extends from one end connected to earth electrode 17 to the other end not connected to other conductors, since its tip, conductor portion 31b, is electrically connected to the metal part 63 of the conductor. Note that if a linear element is defined as an element having a line width greater than that of antenna element 13, the extended conductor 31 illustrated in FIG. 3 does not fall under the category of a linear earth element extending from earth electrode 17, since it has a line width greater than that of antenna element 13.
  • the equivalent series resistance (ESR) between the earth conductor 18 and the metal part 63 is 5 ⁇ or less, the earth electrode 17 included in the earth conductor 18 is stably grounded to the metal part 63, and the antenna gain can be ensured.
  • the ESR is preferably 4 ⁇ or less, more preferably 3 ⁇ or less, and even more preferably 2 ⁇ or less. From the viewpoint of ensuring antenna gain, the ESR may be zero.
  • the surface (mounting surface) of the metal part 63 may be covered with a coating material 67 that is an insulating layer. If the reactance Xr is -50 ⁇ or more and +50 ⁇ or less in frequency band F, the earth conductor 18 (more specifically, at least one of the earth electrode 17 and the extension conductor 31) may be covered with an insulating layer.
  • the antenna element 13 is provided on the main surface 3 of the window glass 1.
  • the antenna element 13 may be provided on the main surface 19a of a dielectric layer 19 provided on the main surface 3 of the window glass 1, as shown in FIG. 1.
  • the dielectric layer 19 may be a dielectric substrate whose main component is a dielectric, and may be, for example, a printed circuit board or a flexible circuit board.
  • the antenna element 13, the power supply electrode 16, and the earth electrode 17 may be provided on the main surface 19a (the same plane) of the dielectric layer 19.
  • the antenna element 13 illustrated in FIG. 3 is an L-shaped element provided on the main surface 3 of the window glass 1.
  • the antenna element 13 extends from the power supply electrode 16 in a first direction (in this example, the negative Y-axis direction) away from the metal portion 63, then bends at a bend point 13b, and extends in a second direction (in this example, the positive X-axis direction) along the inner edge 64 of the metal portion 63 to an open end 13a.
  • the antenna element 13 includes a first element 11 that extends in the first direction from the power supply electrode 16 until it bends at the bend point 13b, and a second element 12 that extends from the bend point 13b to the open end 13a.
  • the element length of the first element 11 is Ha
  • the maximum element length from the power supply electrode 16 to the open end 13a of the antenna element 13 is L.
  • the wavelength shortening rate due to the dielectric plate e.g., the window glass 1 or the dielectric layer 19
  • the wavelength of the radio wave in the air at the center frequency of the frequency band F is ⁇ .
  • the antenna device 101 has the following characteristics: 0.0036 ⁇ k ⁇ Ha ⁇ 0.28 ⁇ k ⁇ Formula 1a 0.062 ⁇ k ⁇ L ⁇ 0.28 ⁇ k ⁇ ...Equation 2a If the above condition is satisfied, the decrease in antenna gain in DAB Band III is suppressed.
  • the antenna device 101 has the following characteristics: 0.00505 ⁇ k ⁇ Ha ⁇ 0.28 ⁇ k ⁇ Formula 3a 0.0717 ⁇ k ⁇ L ⁇ 0.28 ⁇ k ⁇ Formula 4a If the above condition is satisfied, the decrease in antenna gain in the band of terrestrial digital television broadcast waves is suppressed.
  • the antenna device 101 has the following characteristics: 0.00373 ⁇ k ⁇ Ha ⁇ 0.28 ⁇ k ⁇ Formula 5a 0.063 ⁇ k ⁇ L ⁇ 0.28 ⁇ k ⁇ ...Equation 6a If the above condition is satisfied, the decrease in antenna gain in the FM broadcast wave band is suppressed.
  • FIG. 5 is a plan view showing a first modified example of the antenna device of the first embodiment.
  • the antenna 10 may further include a short element 14 extending from one end connected to the earth electrode 17 to the other end connected to another conductor (antenna element 13).
  • the addition of the short element 14 enables impedance matching, and the antenna 10 functions as an inverted-F antenna. Since the tip of the short element 14 is connected to the second element 12 of the antenna element 13, it does not correspond to a linear earth element extending from one end connected to the earth electrode 17 to the other end not connected to another conductor.
  • FIG. 6 is a plan view showing a second modified example of the antenna device of the first embodiment.
  • the extension conductor 31 may include a plurality of conductor portions extending from one end connected to the earth electrode 17 to the other end electrically connected to another conductor (metal portion 63).
  • the plurality of conductor portions have their tips electrically connected to the metal portion 63, and therefore do not correspond to a linear earth element extending from one end connected to the earth electrode 17 to the other end not connected to another conductor.
  • the plurality of conductor portions may be electrically connected to the metal portion 63 via a conductive member 20 described later.
  • the shape of the extension conductor 31 is not important as long as the electrical connection between the earth electrode 17 and the metal portion 63 is not impaired.
  • the shape of the extension conductor 31 may be a loop or mesh.
  • FIG. 7 is a partial plan view of an example configuration of an antenna device of the second embodiment.
  • FIG. 8 is a partial cross-sectional view of an example configuration of an antenna device of the second embodiment.
  • the antenna device 102 is an example configuration of the above antenna device 100.
  • the second embodiment differs from the first embodiment in that the earth conductor 18 includes a three-dimensional conductive member 20 that is in electrical contact with the metal body of the vehicle.
  • the earth conductor 18 shown in Figures 7 and 8 includes a three-dimensional conductive member 20 that is in electrical contact with the metal part 63.
  • the earth electrode 17 included in the earth conductor 18 is stably grounded to the metal part 63. This further reduces the reduction in antenna gain of the antenna 10 due to differences in the length Lg (see Figure 2) of the outer conductor of the coaxial cable 53 from the earth electrode 17 to the intermediate earth point 54, or the reduction in antenna gain due to the presence or absence of the intermediate earth point 54, and as a result, the antenna gain of the antenna device 102 is more secure.
  • the conductive member 20 is interposed between the extended conductor 31 on the main surface 3 and the mounting surface of the metal part 63, and electrically connects the earth electrode 17 and the metal part 63.
  • the conductive member 20 is in contact with the conductor part 31b, and in this case, the conductor part 31a (see Figure 7) is a connecting conductor that connects the earth electrode 17 and the conductive member 20.
  • the conductive member 20 may also be in contact with the conductor part 31a.
  • the conductive member 20 when the conductive member 20 includes the elastic body 21, it deforms to conform to the unevenness of the mounting surface of the metal part 63. Therefore, even if there are unevenness on the mounting surface of the metal part 63, the conductive member 20 has elasticity (including the elastic body 21), so that the earth electrode 17 included in the earth conductor 18 is stably grounded to the metal part 63.
  • the elastic body 21 included in the conductive member 20 may include, for example, a rod-shaped gasket.
  • the gasket may be a member in which the outer surface of the insulating elastic body 21 is coated with a conductive coating 22.
  • a shield gasket is used as the gasket.
  • the conductive member 20 may include a proximity region 23 that is a portion adjacent to the metal portion 63 at a distance of 1 mm or less when viewed in the thickness direction of the metal portion 63 (in this example, the Z-axis direction).
  • the area of the proximity region 23 is S [ mm2 ], and the frequency included in the frequency band F is f [MHz].
  • the antenna device 102 has the following: 9.59 ⁇ 10 3 /f ⁇ S ⁇ 3.24 ⁇ 10 5 /f ... Formula 7a When the above condition is satisfied, the decrease in antenna gain in frequency band F is suppressed.
  • Figure 9 shows the results of simulating the relationship between element length Ha and maximum element length L shown in Figure 3 when frequency band F is the DAB Band III band of 170 MHz to 240 MHz.
  • Dotted line A shows the case of an antenna element 13 having only a first element 11 without a second element 12.
  • the relationship between element length Ha and maximum element length L is in the range above dotted line A and curve B1
  • the decrease in antenna gain in the 70 MHz bandwidth of DAB Band III is suppressed to within 10 dB of the maximum antenna gain in that 70 MHz bandwidth. This result satisfies the above formulas 1a and 2a.
  • Figure 10 shows the results of simulating the relationship between element length Ha and maximum element length L shown in Figure 3 when frequency band F is the band of terrestrial digital television broadcast waves from 470 MHz to 710 MHz.
  • Dotted line A shows the case of an antenna element 13 having only a first element 11 without a second element 12.
  • the relationship between element length Ha and maximum element length L is in the range above dotted line A and curve B2
  • the decrease in antenna gain in the 240 MHz bandwidth of terrestrial digital television broadcast waves is suppressed to within 10 dB of the maximum antenna gain in that 240 MHz bandwidth. This result satisfies the above formulas 3a and 4a.
  • Figure 11 shows the results of simulating the relationship between element length Ha and maximum element length L shown in Figure 3 when frequency band F is the band of FM broadcast waves from 76 MHz to 108 MHz.
  • Dotted line A shows the case of an antenna element 13 consisting of only a first element 11 without a second element 12.
  • the relationship between element length Ha and maximum element length L is in the range above dotted line A and curve B3
  • the decrease in antenna gain in the 32 MHz bandwidth of FM broadcast waves is suppressed to within 10 dB of the maximum antenna gain in that 32 MHz bandwidth. This result satisfies the above formulas 5a and 6a.
  • An antenna device that is installed in a vehicle and is capable of receiving radio waves in a predetermined frequency band, a feeding electrode to which a signal line of the transmission line is electrically connected; an antenna element electrically connected to the feeding electrode; a ground conductor including a ground electrode to which the ground conductor of the transmission line is electrically connected; a reactance between the earth conductor and a metal body of the vehicle is greater than or equal to ⁇ 50 ⁇ and less than or equal to +50 ⁇ in the frequency band; An antenna device that does not have a linear earth element extending from one end connected to the earth electrode to the other end that is not connected to any other conductor. (Appendix 2) 2.
  • the antenna device wherein an equivalent series resistance between the earth conductor and the metal body is 5 ⁇ or less.
  • (Appendix 3) 3.
  • (Appendix 4) 4.
  • (Appendix 5) 5.
  • the antenna element includes an L-shaped element provided on a dielectric plate, The antenna device according to any one of claims 1 to 5, wherein the L-shaped element extends in a first direction away from the metal body from the feeding electrode and then bends in a second direction.
  • the L-shaped element includes a first element extending in the first direction from the power supply electrode and bending, Let Ha be the element length of the first element, L be the maximum element length from the feeding electrode to the open end of the antenna element, k be the wavelength shortening rate caused by the dielectric plate, and ⁇ be the wavelength of radio waves in the air at the center frequency of the frequency band. 0.0036 ⁇ k ⁇ Ha ⁇ 0.28 ⁇ k ⁇ , 0.062 ⁇ k ⁇ L ⁇ 0.28 ⁇ k ⁇ , 7.
  • the antenna device according to claim 6, (Appendix 8) 8. The antenna device according to claim 6, wherein the feeding electrode, the antenna element and the earth electrode are provided on the same plane of the dielectric plate. (Appendix 9) 9.
  • the dielectric plate includes a glass plate of the vehicle.
  • Appendix 10 10.
  • Appendix 11 11.
  • Appendix 12 12.
  • Appendix 13 The antenna device according to any one of claims 1 to 12, wherein the earth conductor includes a three-dimensional conductive member that is in electrical contact with the metal body.
  • the conductive member includes a proximity region that is a portion adjacent to the metal body at a distance of 1 mm or less when viewed in a thickness direction of the metal body, When the area of the adjacent region is S [mm 2 ] and the frequency included in the frequency band is f [MHz], 9.59 ⁇ 10 3 /f ⁇ S ⁇ 3.24 ⁇ 10 5 /f 14.
  • the earth conductor includes a connecting conductor that connects the earth electrode and the conductive member.
  • the conductive member includes an elastic body. (Appendix 17) 17.
  • Appendix 18 18.
  • the metal body includes a flange that faces a glass panel of the vehicle; 19.
  • Appendix 20 20.
  • Appendix 21 21.
  • the frequency band is at least one of an FM broadcast wave band, a DAB Band III band, and a terrestrial digital television broadcast wave band.

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Abstract

Selon la présente invention, un dispositif d'antenne est disposé sur un véhicule et est apte à recevoir des ondes radio dans une bande de fréquence prescrite, le dispositif d'antenne comprenant une électrode d'alimentation électrique à laquelle une ligne de signal d'une ligne de transmission est électriquement connectée, un élément d'antenne qui est électriquement connecté à l'électrode d'alimentation électrique, et un conducteur de terre comprenant une électrode de terre à laquelle un conducteur de mise à la terre de la ligne de transmission est électriquement connecté, la réactance entre le conducteur de terre et un corps métallique du véhicule dans la bande de fréquence étant de - 50 Ω à +50 Ω, et le dispositif d'antenne ne comprenant pas d'élément de terre linéaire qui s'étend à partir de l'électrode de terre.
PCT/JP2023/042492 2022-12-01 2023-11-28 Dispositif d'antenne WO2024117114A1 (fr)

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JP2022-192787 2022-12-01
JP2022192787 2022-12-01

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07115313A (ja) * 1992-10-09 1995-05-02 Asahi Glass Co Ltd 自動車用の高周波ガラスアンテナ
US6097345A (en) * 1998-11-03 2000-08-01 The Ohio State University Dual band antenna for vehicles
JP2004193680A (ja) * 2002-12-06 2004-07-08 Fujitsu Ten Ltd 車載用アンテナおよびダイバシティ受信装置
WO2005027260A2 (fr) * 2003-09-15 2005-03-24 Harada Industry Co., Ltd. Antenne integree a couplage de mise a la terre
JP2005137024A (ja) * 2005-01-04 2005-05-26 Nippon Sheet Glass Co Ltd フィルムアンテナ装置およびフィルムアンテナ
JP2005151273A (ja) * 2003-11-18 2005-06-09 Nippon Antenna Co Ltd ガラスアンテナ
JP2005534215A (ja) * 2002-07-24 2005-11-10 ハラダ・インダストリー・カンパニー・リミテッド 車両用統合ループアンテナ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07115313A (ja) * 1992-10-09 1995-05-02 Asahi Glass Co Ltd 自動車用の高周波ガラスアンテナ
US6097345A (en) * 1998-11-03 2000-08-01 The Ohio State University Dual band antenna for vehicles
JP2005534215A (ja) * 2002-07-24 2005-11-10 ハラダ・インダストリー・カンパニー・リミテッド 車両用統合ループアンテナ
JP2004193680A (ja) * 2002-12-06 2004-07-08 Fujitsu Ten Ltd 車載用アンテナおよびダイバシティ受信装置
WO2005027260A2 (fr) * 2003-09-15 2005-03-24 Harada Industry Co., Ltd. Antenne integree a couplage de mise a la terre
JP2005151273A (ja) * 2003-11-18 2005-06-09 Nippon Antenna Co Ltd ガラスアンテナ
JP2005137024A (ja) * 2005-01-04 2005-05-26 Nippon Sheet Glass Co Ltd フィルムアンテナ装置およびフィルムアンテナ

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