EP2940793B1 - Vitre avant de véhicule équipée d'une antenne en verre - Google Patents

Vitre avant de véhicule équipée d'une antenne en verre Download PDF

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Publication number
EP2940793B1
EP2940793B1 EP13868565.6A EP13868565A EP2940793B1 EP 2940793 B1 EP2940793 B1 EP 2940793B1 EP 13868565 A EP13868565 A EP 13868565A EP 2940793 B1 EP2940793 B1 EP 2940793B1
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EP
European Patent Office
Prior art keywords
antenna
antenna element
power feeder
feeder unit
glass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13868565.6A
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German (de)
English (en)
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EP2940793A1 (fr
EP2940793A4 (fr
Inventor
Takuji Hayashi
Satoshi Tokunaga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGC Inc
Original Assignee
Asahi Glass Co Ltd
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Filing date
Publication date
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Publication of EP2940793A1 publication Critical patent/EP2940793A1/fr
Publication of EP2940793A4 publication Critical patent/EP2940793A4/fr
Application granted granted Critical
Publication of EP2940793B1 publication Critical patent/EP2940793B1/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
    • H01Q1/1271—Supports; Mounting means for mounting on windscreens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • 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

Definitions

  • the present invention relates to a vehicle windshield provided with a glass antenna.
  • Digital audio broadcasting consists of two different frequency bandwidths, that is, Band III ranging from 174 MHz to 240 MHz and L Band ranging from 1452 MHz to 1492 MHz.
  • Patent Citation 1 discloses a glass antenna configured to be capable of dealing with dual bandwidths, and to have high receiver sensitivity.
  • Patent Citation 1 JP-A-2012-23707 , also published as EP2581983 .
  • a glass antenna It is difficult to design a glass antenna to be capable of dealing with a broadcast wave consisting of two separated frequency bandwidths as in the DAB, and to have high receiver sensitivity. Since much consideration is required in order for visibility from a driver's seat not to be disturbed when a glass antenna is mounted on the windshield compared to when the glass antenna is mounted on a rear window or a side window, the glass antenna is required to have an inconspicuous shape. For this reason, a mounting region of the glass antenna is limited, and thereby it becomes difficult to design a glass antenna having high receiver sensitivity.
  • the present invention provides a vehicle windshield provided with a glass antenna configured to be capable of dealing with dual bandwidths such as DAB, to have high receiver sensitivity and aesthetic appearance, and not to disturb visibility from a driver's seat.
  • a vehicle windshield provided with a glass antenna comprises:
  • a vehicle windshield provided with a glass antenna configured to be capable of dealing with dual bandwidths such as DAB, to have high receiver sensitivity and aesthetic appearance, and not to disturb visibility from a driver's seat.
  • Fig. 2 is a plan view of a vehicle windshield 100 provided with a glass antenna 105
  • Fig. 3 is an enlarged plan view illustrating the glass antenna 105.
  • a light shield black film 14 is provided in a region with a predetermined width from an outer edge 19 of the vehicle windshield 100 provided with a glass antenna in the viewpoint of preventing the degradation of an adhesive, and in the viewpoint of aesthetic appearance so as to hide a connection portion of the windshield connected to a metal portion of a vehicle body.
  • the light shield black film 14 has a convex portion 15 which protrudes inwards in the in-plane direction from a region along an upper side of the windshield, and which is formed in a trapezoidal shape.
  • Opposite lateral sides of the convex portion 15 are diagonally formed in such a manner that the distance between the opposite lateral sides decreases inwards in the plane of the windshield, and in this specification, an angle formed between a vertical center line 20 passing through the center of gravity of the windshield, and an extension line of the lateral side of the convex portion 15 is set to 5° or greater to 85° or less.
  • the light shield black film may be formed uniformly or may be formed by a plurality of dots.
  • the glass antenna 105 consists of a power feeder unit 12 and an antenna conductor, which are formed as planar patterns on a windshield 11.
  • the power feeder unit 12 is configured to electrically connect the antenna conductor and a signal processing circuit (not illustrated) such as an amplifier via a predetermined conductive member.
  • a power feeder line such as an AV line or a coaxial cable is used as the conductive member.
  • the coaxial cable is used as the conductive member, preferably, an inner conductor of the coaxial cable is electrically connected to the power feeder unit 12, and an outer conductor of the coaxial cable is grounded to the vehicle body.
  • a connector for electrically connecting the signal processing circuit (for example, an amplifier) and the power feeder unit 12 may be mounted on the power feeder unit 12. Owing to such a connector, the AV line or the inner conductor of the coaxial cable is easily attached to the power feeder unit 12.
  • the following configuration may be adopted: a protruding conductive member is mounted on the power feeder unit 12, and the protruding conductive member is brought into contact with and is fitted into a connection portion of a vehicle body flange to which the windshield 11 is attached.
  • a part of the power feeder unit 12 may be provided in a circumferential edge region of the light shield black film 14, and particularly, the entirety of the power feeder unit 12 is preferably provided in the circumferential edge region.
  • the power feeder unit 12 may be provided in the circumferential edge region close to the convex portion 15.
  • the "vicinity of the convex portion 15" implies a range in which the power feeder unit 12 is allowed to be provided such that the effects of the present invention are not degraded, and specifically, a part of the power feeder unit 12 may be provided in a region having a radius of 35 mm around a root of the lateral side of the convex portion 15.
  • the glass antenna 105 includes a first antenna element 1 and a second antenna element 2 as the antenna conductors.
  • the first antenna element 1 is connected to the power feeder unit 12, and extends diagonally and downwards along the lateral side of the convex portion 15 which protrudes inwards in the in-plane direction from the region of the light shield black film 14 along the upper side of the windshield, and which is formed in a trapezoidal shape.
  • Fig. 3 illustrates the first antenna element 1 that extends diagonally along the circumference of the convex portion 15, and then is horizontally bent.
  • the term "along the lateral side of the convex portion 15" implies a range in which first antenna element 1 is allowed to be separate from the lateral side of the convex portion 15 such that the present invention is not degraded in the viewpoint of aesthetic appearance and visual appearance.
  • the first antenna element 1 is preferably within a distance of 15 mm from the edge of a light shield black film portion of the convex portion 15, and, more preferably, within a distance of 10 mm.
  • the bending of the first antenna element 1 is not necessarily required, and when the diagonally extending lateral side of the convex portion 15 is considerably long, the first antenna element 1 may consist of only a diagonal linear portion along the lateral side of the convex portion 15.
  • the diagonal linear portion of the first antenna element along the lateral side of the convex portion 15 preferably has a length of 10 mm or greater to 300 mm or less, and, more preferably, a length of 30 mm or greater to 300 mm or less so as to obtain an improvement in antenna gain, and aesthetic appearance.
  • the second antenna element 2 is connected to the first antenna element 1 via the power feeder unit 12, and extends in parallel with the first antenna element 1 while a predetermined gap is present therebetween.
  • Fig. 3 illustrates the second antenna element 2 along the first antenna element 1.
  • the gap between the two antenna elements is preferably 1 mm or greater to 15 mm or less, and, more preferably, 3 mm or greater to 10 mm or less.
  • the first antenna element 1 is connected to a corner of the power feeder unit 12; however, the first antenna element 1 may not be connected to the corner, and may be connected to any location on an outer circumference of the power feeder unit 12. Similarly, the second antenna element 2 may be connected to any location on the outer circumference of the power feeder unit 12.
  • Figs. 4 and 5 illustrate examples in which the configuration of the first embodiment is changed.
  • the first antenna element 1 is connected to the power feeder unit 12 via a first connection element 6 that extends horizontally from the power feeder unit 12.
  • the second antenna element 2 is connected to the first antenna element 1 via the power feeder unit 12 and a second connection element 7 configured to extend horizontally from the power feeder unit 12.
  • the second connection element 7 may be configured to directly connect the second antenna element 2 and the first antenna element 1.
  • the first antenna element 1 may be connected to the power feeder unit directly or via the first connection element 6, and the second antenna element 2 may be connected to the first antenna element 1 via the power feeder unit 12 or the second connection element 7, or both the power feeder unit 12 and the second connection element 7.
  • the length of the first antenna element 1 when the first connection element 6 is provided as illustrated in Fig. 4 , the length of the first antenna element 1 also includes the length of the first connection element 6, and the same applies hereinafter) and the length of the second antenna element 2 (when the second connection element 7 is provided so as to extend directly from the power feeder unit 12 as illustrated in Fig.
  • the length of the second antenna element 2 also includes the length of the second connection element 7, and when the second antenna element 2 is directly connected to the first antenna element 1 via the second connection element 7 as illustrated in Fig. 5 , the length of the second antenna element 2 also includes the length of the shortest path from a connection point between the second connection element 7 and the first antenna element 1 to the power feeder unit 12, and the same applies hereinafter) are preferably set to (5/32) x ⁇ g1 or greater to (5/16) x ⁇ g1 or less so as to obtain an improvement in the antenna gain of the first frequency bandwidth.
  • the length of each of the first antenna element 1 and the second antenna element 2 is preferably adjusted to 145 mm or greater to 289 mm or less.
  • An angle ⁇ formed between an extension line of each of the first antenna element 1 and the second antenna element 2 illustrated in Fig. 2 , and the vertical center line 20 passing through the center of gravity of the windshield is preferably set to 5° or greater to 50° or less, more preferably, 20° or greater to 45° or less. When at least the angle is set to 50° or less, it is possible to considerably increase obtainable gain.
  • the shape of the convex portion 15 is preferably designed in such a manner that the angle formed between the extension line of the lateral side of the convex portion 15 of the light shield black film, and the vertical center line 20 passing through the center of gravity of the windshield is equal to the angle ⁇ formed between the extension line of each of the first antenna element 1 and the second antenna element 2, and the vertical center line 20 passing through the center of gravity of the windshield. The reason for this is that both good antenna performance and aesthetic appearance are obtained.
  • the antenna elements are configured along the convex portion 15 which protrudes inwards in the in-plane direction from the region of the light shield black film 14 along the upper side of the windshield, and which is formed in a trapezoidal shape, even though the antenna configured to receive a dual-bandwidth broadcast wave is mounted, it is possible to obtain the vehicle windshield provided with the glass antenna which has the low-visibility antenna conductors, does not disturb a visual field of a driver, and has the beautiful appearance while ensuring antenna performance.
  • a loop may be formed by at least the first antenna element 1, the second antenna element 2, and a loop formation element 5 by connecting end portions being opposite to the power feeder unit 12 of the first antenna element 1 and the second antenna element 2 via a loop formation element 5.
  • a loop is formed by including the power feeder unit 12. Since the loop formation element 5 is an arbitrary configuration, for illustrative purposes, the loop formation element 5 is illustrated by a dotted line in Fig. 3 ; however, actually, the loop formation element 5 is a continuous line-like conductor similar to the first antenna element 1 and the like. Since a continuous loop is formed using the first antenna element 1 and the second antenna element 2, it is possible to considerably improve an obtainable antenna gain.
  • the length of the loop formation element 5 may be longer than the gap between the first antenna element 1 and the second antenna element 2.
  • a foldback element 8 extends from a tip end of the loop formation element 5 in parallel with the first antenna element 1, while a predetermined gap present is present between the first antenna element 1 and the foldback element 8. Since the foldback element 8 is formed, it is possible to improve an obtainable antenna gain. In addition, it is possible to decrease the length of each of the first antenna element 1 and the second antenna element 2.
  • the foldback element 8 may extend in the middle of the loop formation element 5. In Figs.
  • the foldback element 8 may be provided in either one of the first antenna element 1 and the second antenna element 2, and two or more foldback elements 8 may be provided.
  • Fig. 5 illustrates an example in which a tip end of the foldback element 8 is further bent.
  • the bending of the tip end of the foldback element 8 is mainly effective in adjusting the gain of L band. Since the foldback element 8 is an arbitrary configuration requirement, for illustrative purposes, the foldback element 8 is illustrated by a dotted line in Figs. 4 and 5 ; however, actually, the foldback element 8 is a continuous line-like conductor similar to the first antenna element and the like.
  • a third antenna element 3 may be added in such a manner as to extend horizontally from the power feeder unit 12.
  • the third antenna element 3 is mainly used to adjust the gain of L band.
  • Fig. 3 illustrates an example in which the third antenna element 3 extends horizontally in an opposite side of an incline direction of the first antenna element 1 and the second antenna element 2, and in contrast, as illustrated in Figs. 4 and 5 , the third antenna element 3 may extend horizontally in the same side as the incline direction. Since the third antenna element 3 is an arbitrary configuration requirement, for illustrative purposes, the third antenna element 3 is illustrated by a dotted line in Figs. 3 to 5 ; however, actually, the third antenna element 3 is a continuous line-like conductor similar to the first antenna element and the like.
  • the third antenna element 3 is connected to a corner of the power feeder unit 12; however, the third antenna element 3 may not be connected to the corner, and may be connected to any location on the outer circumference of the power feeder unit 12.
  • the length of the third antenna element 3 is preferably set to (1/8) x ⁇ g2 or greater to (7/8) x ⁇ g2 or less so as to improve the antenna gain of the second frequency bandwidth.
  • the length of the third antenna element 3 is preferably adjusted to 16 mm or greater to 114 mm or less.
  • Fig. 6 is an enlarged plan view illustrating a glass antenna 405 of a vehicle windshield provided with a glass antenna.
  • the same reference signs as those in Fig. 3 will be assigned to members of the vehicle windshield provided with a glass antenna, and the glass antenna 405, which have the same configurations as in the vehicle windshield provided with a glass antenna, and the glass antenna 105 illustrated in Fig. 3 .
  • the glass antenna 405 consists of the power feeder unit 12, a ground-side power feeder unit 16, and an antenna conductor, which formed as planar patterns on the windshield 11.
  • the power feeder unit 12 is a power feed point electrically connected to a signal path of a signal processing circuit (not illustrated) such as an amplifier via a predetermined conductive member
  • the ground-side power feeder unit 16 is a power feed point electrically connected to an external ground path (for example, a ground of the signal processing circuit or the vehicle body) via a predetermined conductive member.
  • the ground-side power feeder unit 16 may be electrically connected to the signal path of the signal processing circuit (not illustrated) such as an amplifier via the predetermined conductive member
  • the power feeder unit 12 may be electrically connected to the external ground path (for example, the ground of the signal processing circuit or the vehicle body) via the predetermined conductive member.
  • the glass antenna 405 is a bipolar antenna configured to include the power feeder unit 12 and the ground-side power feeder unit 16 as a pair of power feed points.
  • a power feeder line such as an AV line or a coaxial cable is used as the conductive member.
  • the coaxial cable is used as the conductive member, preferably, an inner conductor of the coaxial cable is electrically connected to the power feeder unit 12, and an outer conductor of the coaxial cable is connected to the ground-side power feeder unit 16.
  • Connectors for electrically connecting the signal processing circuit (for example, an amplifier) to the power feeder unit 12 and the ground-side power feeder unit 16 may be respectively mounted on the power feeder unit 12 and the ground-side power feeder unit 16. Owing to such connectors, the inner conductor and the outer conductor of the coaxial cable are easily attached to the power feeder unit 12 and the ground-side power feeder unit 16, respectively.
  • a protruding conductive member is mounted on each of the power feeder unit 12 and the ground-side power feeder unit 16, and the protruding conductive member is brought into contact with and is fitted into the connection portion of the vehicle body flange to which the windshield 11 is attached.
  • a fourth antenna element 4 may be added in such a manner as to extend horizontally from the ground-side power feeder unit 16.
  • the ground-side power feeder unit 16 or both the ground-side power feeder unit 16 and the fourth antenna element 4 are added, it is possible to decrease the length of each of the first antenna element 1 and the second antenna element 2 to approximately 0.75 times that of the first embodiment, and to make the glass antenna less invisible than that of the first embodiment, and the glass antenna is good in the viewpoint of aesthetic appearance.
  • the fourth antenna element 4 is connected to a corner of the power feeder unit 12; however, the fourth antenna element 4 may not be connected to the corner, and may be connected to any location on the outer circumference of the power feeder unit 12.
  • the ground-side power feeder unit 16 is preferably grounded to the vehicle body positioned close to the glass antenna.
  • the power feeder unit 12 and the outer conductor of the coaxial cable connected to the ground-side power feeder unit 16 are preferably connected to the vehicle body positioned within a distance of 180 mm or less from the power feeder unit 12 and the ground-side power feeder unit 16.
  • a loop may be formed by at least the first antenna element 1, the second antenna element, and the loop formation element by connecting the end portions being opposite to the power feeder unit of the first antenna element 1 and the second antenna element 2 via the loop formation element 5, and the third antenna element 3 extending horizontally from the power feeder unit 12 may also be added. It is possible to considerably improve an obtainable antenna gain by forming the loop, and the addition of the third antenna element 3 is mainly effective in adjusting the gain of L band.
  • the length of the first antenna element 1 and the length of the second antenna element 2 are preferably set to (9/64) x ⁇ g1 or greater to (15/64) x ⁇ g1 or less so as to obtain an improvement in the antenna gain of the first frequency bandwidth.
  • the length of each of the first antenna element 1 and the second antenna element 2 is preferably adjusted to 130 mm or greater to 217 mm or less.
  • Figs. 7 and 8 illustrate examples in which the configuration of the second embodiment is changed.
  • the second antenna element 2 extends diagonally along the first antenna element 1, and is connected to the first antenna element 1 via the second connection element 7 configured to extend horizontally from the power feeder unit 12.
  • the second antenna element 2 is connected to an end portion being opposite to the power feed point of the first antenna element 1 via the second connection element 7.
  • a cutout portion 9 is provided in the middle of the second antenna element 2.
  • the second antenna element 2 may be joined to any location on the first antenna element 1 via the second connection element 7, and the second antenna element 2 may have the cutout portion 9 in the middle thereof. The providing of the cutout portion 9 improves an obtainable antenna gain.
  • the end portions being opposite to the power feeder unit 12 of the first antenna element 1 and the second antenna element 2 may be in the middle of bent portions.
  • the third antenna element 3 and the fourth antenna element 4 may extend horizontally from a right upper corner of the power feeder unit 12 and a left upper corner of the ground-side power feeder unit 16, respectively.
  • the application of this configuration is not limited to the second embodiment, and this configuration can also be applied to the first embodiment.
  • connection portions of the elements may be curvedly connected to each other.
  • the antenna conductor, the power feeder unit 12, and the ground-side power feeder unit 16 are formed by printing paste containing a conductive metal (for example, silver paste) on an inner surface of the windshield and baking the paste.
  • a method of forming the antenna conductor, the power feeder unit 12, and the ground-side power feeder unit 16 is not limited to the above-mentioned method.
  • the antenna conductor, the power feeder unit 12, and the ground-side power feeder unit 16 may be formed by providing a line-like body or a foil-like body made of a conductive material such as copper on the inner surface of the windshield, by bonding the line-like body or the foil-like body to the windshield by using an adhesive, or by embedding the line-like body or the foil-like body in the windshield.
  • the shape of the power feeder unit 12 and the ground-side power feeder unit 16 may be determined corresponding to the shape of the conductive member or a mounting surface of the connector.
  • a quadrate shape such as a square shape, a substantially square shape, a rectangular shape, or a substantially rectangular shape, or a polygonal shape is preferably used in the viewpoint of mounting.
  • a circular shape, a substantially circular shape, an elliptical shape, a substantially elliptical shape, or the like may be used.
  • a conductor layer made up of the antenna conductors may be embedded in a composite resin film or is provided on the surface of the composite resin film, and the composite resin film provided with the conductor layer may be formed on the inner surface or an outer surface of the windshield as the glass antenna.
  • a flexible circuit substrate having the antenna conductors formed thereon may be formed on the inner surface of the windshield as the glass antenna.
  • the antenna gain of the vehicle windshield provided with a glass antenna is measured in a state where the vehicle windshield provided the glass antenna as illustrated in Fig. 2 is actually attached to a vehicle.
  • a measurement result will be described.
  • the antenna gain was measured in a state where the vehicle windshield provided with a glass antenna was assembled to a window frame of the vehicle on a turntable while being inclined by approximately 25° relative to a horizontal plane.
  • the power feeder unit had a connector attached thereto, and was connected to a network analyzer via a feeder line.
  • the turntable was rotated in such a manner that radio waves were horizontally radiated on the windshield in all directions.
  • the antenna gain was measured while rotating the vehicle by 360° in a state where the center of the turntable was aligned with the center of the vehicle to which the vehicle windshield provided with a glass antenna is assembled.
  • the data obtained by measuring the antenna gain while rotating the vehicle by 360° at every rotation angle of 5° at each frequency are averaged.
  • the measurement was performed at every 3 MHz in the frequency range of Band III, and at every 1.7 MHz in the frequency range of L band.
  • the antenna gain was measured in a state where an elevation angle between a position of the transmission of radio waves and the antenna conductor was set to be substantially horizontal (when an elevation angle was 0° in a plane parallel with the ground, and an elevation angle was 90° in a vertical direction, the term "being substantially horizontal” indicated a direction at an elevation angle of 0°).
  • the antenna gain was normalized on the basis of a half-wavelength dipole antenna in such a manner that the antenna gain of the half-wavelength dipole antenna became 0 dB.
  • Fig. 9 illustrates a result of measuring an impact of the length of a diagonally extending portion of the first antenna element on the gain of Band III while fixing the entire length of the first antenna element 1 at 170 mm, and changing the length of the diagonally extending portion and the length of the horizontally extending portion of the first antenna element 1.
  • the antenna gains averaged for the entire frequencies of Band III were plotted.
  • each of the elements was 0.4 mm.
  • Each of the power feeder unit 12 and the ground-side power feeder unit 16 had a rectangular shape having a vertical length of 14 mm by a horizontal length of 20 mm.
  • the gap between the power feeder unit 12 and the ground-side power feeder unit 16 was 21 mm.
  • the conductive width of the element, the size of the power feeder unit, and the gap between the power feeder unit 12 and the ground-side power feeder unit 16 were the same in all of Examples hereinbelow.
  • the antenna gains were measured to obtain an impact on the gain of Band III and L band when the second antenna element 2 was provided, or when a loop was formed by the second antenna element 2 and the loop formation element 5 compared to when only the first antenna element 1 was provided in the unipolar glass antenna 105 including the third antenna element 3 illustrated in Fig. 3 .
  • Figs. 10(A) and 10(B) illustrate the results. Antenna gains averaged for the entire frequencies of each of Band III and L band were plotted.
  • a "first example” referred to the case in which only the first antenna element 1 was provided
  • a "second example” referred to the case in which the second antenna element 2 was provided
  • a "third example” referred to the case in which the loop formation element 5 was provided, and a loop was formed by the first antenna element 1 and the second antenna element 2.
  • the antenna gains were measured to obtain an impact of the length of the first antenna element 1 on the gain of Band III while changing the length of the first antenna element 1 in a state where the second antenna element 2 and the loop formation element 5 are omitted from the glass antenna 105 including the third antenna element 3 illustrated in Fig. 3 .
  • Fig. 11 illustrates the results.
  • the antenna gains averaged for the entire frequencies of Band III were plotted.
  • a high gain was obtained by setting the length of the first antenna element 1 to 145 mm to 289 mm.
  • the antenna gain of the glass antenna 505 was measured to obtain an impact of the angle ⁇ formed between the extension line of the first antenna element 1, and the center line 20 in the vertical direction of the windshield on the gain of Band III and L band.
  • Figs. 12(A) and 12(B) illustrate the results. Antenna gains averaged for the entire frequencies of each of Band III and L band were plotted.
  • the test was performed in a state where parameters other than the angle of the first antenna element 1 were fixed.
  • the antenna gain was measured to obtain an impact on the gain of Band III and L band when the second connection element 7 and the second antenna element 2 were provided, or when a loop was formed by the second connection element 7, the second antenna element 2, and the loop formation element 5 compared to when the third antenna element 3 and the fourth antenna element 4 are provided and only the first antenna element 1 is provided in the bipolar glass antenna 505 illustrated in Fig. 7 .
  • Figs. 13(A) and 13(B) illustrate the results.
  • a "fourth example” referred to the case in which only the first antenna element 1 was provided
  • a "fifth example” referred to the case in which the second connection element 7 and the second antenna element 2 were provided
  • a "sixth example” referred to the case in which the loop formation element 5 was provided, and a loop was formed by the first antenna element 1 and the second antenna element 2.
  • the antenna gain was measured to obtain an impact of the length of the first antenna element 1 on the gain of Band III while changing the length of the first antenna element 1 in a state where the second connection element 7, the second antenna element 2, and the loop formation element 5 are omitted from the bipolar glass antenna 505 illustrated in Fig. 7 .
  • Fig. 14 illustrates the results.

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Claims (14)

  1. Un pare-brise de véhicule pourvu d'une antenne de vitre comprenant :
    une antenne de vitre (105)
    présentant un conducteur d'antenne et une unité d'alimentation en énergie (12) ; et
    un film noir de protection contre la lumière (14)
    étant formé dans une zone marginale circonférentielle du pare-brise (11) de véhicule, et présentant une portion convexe (15) qui saillit vers l'intérieur dans une direction dans le plan à partir d'une zone le long d'une partie supérieure du pare-brise (11) de véhicule dans la zone marginale circonférentielle, et qui est formé avec une forme de trapèze,
    sachant que l'unité d'alimentation en énergie (12) est fournie dans la zone marginale circonférentielle à proximité de la portion convexe, et
    sachant que le conducteur d'antenne présente un premier élément d'antenne (1) connecté directement ou via un premier élément de connexion à l'unité d'alimentation en énergie (12), et configuré pour s'étendre en diagonale le long d'un côté latéral de la portion convexe, et un deuxième élément d'antenne (2) connecté à l'élément d'antenne (1) via au moins un parmi l'unité d'alimentation en énergie (12) et un deuxième élément de connexion, et configuré pour s'étendre en parallèle avec le premier élément d'antenne (1), pendant qu'un espace prédéterminé est présent entre eux.
  2. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après la revendication 1,
    sachant qu'un angle formé entre une ligne d'extension d'une portion linéaire de chacun parmi le premier élément d'antenne et le deuxième élément d'antenne le long du côté latéral de la portion convexe, et une ligne centrale verticale passant à travers le centre de gravité du pare-brise de véhicule, comporte entre 5° ou plus et 50° ou moins.
  3. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après la revendication 1 ou 2,
    sachant que le conducteur d'antenne présente un élément de formation de boucle configuré pour connecter des portions terminales opposées à l'unité d'alimentation en énergie du premier élément d'antenne et du deuxième élément d'antenne.
  4. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après la revendication 3,
    sachant que le conducteur d'antenne présente un élément de repliement (foldback element) connecté à l'élément de formation de boucle et configuré pour s'étendre en parallèle avec le premier élément d'antenne, pendant qu'un espace prédéterminé est présente entre eux.
  5. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après une quelconque des revendications de 1 à 4,
    sachant que le conducteur d'antenne présente un troisième élément d'antenne connecté à l'unité d'alimentation en énergie et configuré pour s'étendre horizontalement.
  6. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après la revendication 5,
    sachant que l'antenne de vitre reçoit une première bande passante de fréquence prédéterminée et une deuxième bande passante de fréquence prédéterminée plus haute que la première bande passante de fréquence, et lorsqu'il est supposé qu'une fréquence centrale de la deuxième bande passante de fréquence présente une longueur d'onde λ02 dans l'air, le coefficient de raccourcissement de longueur d'onde du pare-brise est k, et une longueur d'onde λg2 dans le pare-brise est égale à λ02 x k, la distance entre l'unité d'alimentation en énergie et une portion terminale opposée à l'unité d'alimentation en énergie du troisième élément d'antenne comporte (1/8) x λg2 ou plus jusqu'à (7/8) x λg2 ou moins.
  7. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après la revendication 5,
    sachant que le troisième élément d'antenne présente une longueur de 16 mm ou plus jusqu'à 114 mm ou moins.
  8. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après une quelconque des revendications de 1 à 7,
    sachant que l'antenne de vitre reçoit une première bande passante de fréquence prédéterminée et une deuxième bande passante de fréquence prédéterminée plus haute que la première bande passante de fréquence, et lorsqu'il est supposé qu'une fréquence centrale de la première bande passante de fréquence présente une longueur d'onde λ01 dans l'air, le coefficient de raccourcissement de longueur d'onde du pare-brise est k, et une longueur d'onde λg1 dans le pare-brise est égale à λ01 x k, la distance entre l'unité d'alimentation en énergie et les portions terminales opposées à l'unité d'alimentation en énergie du premier élément d'antenne et du deuxième élément d'antenne comporte (5/32) x λg1 ou plus jusqu'à (5/16) x λg1 ou moins.
  9. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après une quelconque des revendications de 1 à 7,
    sachant que le premier élément d'antenne et le deuxième élément d'antenne présentent une longueur de 145 mm ou plus jusqu'à 289 mm ou moins.
  10. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après une quelconque des revendications de 1 à 9,
    sachant que l'antenne de vitre présente une unité d'alimentation en énergie côté masse à proximité de l'unité d'alimentation en énergie.
  11. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après la revendication 10,
    sachant que l'antenne de vitre présente un quatrième élément d'antenne configuré pour s'étendre horizontalement à partir de l'unité d'alimentation en énergie côté masse dans un côté opposé à l'unité d'alimentation en énergie.
  12. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après la revendication 10 ou 11,
    sachant que l'antenne de vitre reçoit une première bande passante de fréquence prédéterminée et une deuxième bande passante de fréquence prédéterminée plus haute que la première bande passante de fréquence, et lorsqu'il est supposé qu'une fréquence centrale de la première bande passante de fréquence présente une longueur d'onde λ01 dans l'air, le coefficient de raccourcissement de longueur d'onde du pare-brise est k, et une longueur d'onde λg1 dans le pare-brise est égale à λ01 x k, la distance entre l'unité d'alimentation en énergie et des portions terminales opposées à l'unité d'alimentation en énergie du premier élément d'antenne et du deuxième élément d'antenne comporte (9/64) x λg1 ou plus jusqu'à (15/64) x λg1 ou moins.
  13. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après la revendication 10 ou 11,
    sachant que le premier élément d'antenne et le deuxième élément d'antenne présentent une longueur de 130 mm ou plus jusqu'à 217 mm ou moins.
  14. Le pare-brise de véhicule pourvu d'une antenne de vitre d'après une quelconque des revendications de 1 à 13,
    sachant que le premier élément d'antenne et le deuxième élément d'antenne présentent une portion qui s'étend en diagonale, dont la longueur comporte 10 mm ou plus.
EP13868565.6A 2012-12-27 2013-12-27 Vitre avant de véhicule équipée d'une antenne en verre Active EP2940793B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012285247 2012-12-27
PCT/JP2013/085261 WO2014104365A1 (fr) 2012-12-27 2013-12-27 Vitre avant de véhicule équipée d'une antenne en verre

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EP2940793A1 EP2940793A1 (fr) 2015-11-04
EP2940793A4 EP2940793A4 (fr) 2016-08-17
EP2940793B1 true EP2940793B1 (fr) 2017-04-19

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3034296A1 (fr) * 2014-12-19 2016-06-22 AGC Glass Europe Vitrage feuillete
JP6503842B2 (ja) * 2015-03-31 2019-04-24 Ａｇｃ株式会社 車両用アンテナ及び車両用アンテナを備えた窓板
EP3300167B1 (fr) * 2015-05-21 2021-06-09 AGC Inc. Vitre de véhicule et antenne
US9985333B2 (en) 2015-05-22 2018-05-29 Asahi Glass Company, Limited Window glass for vehicle and glass antenna
JP6880986B2 (ja) * 2016-05-10 2021-06-02 Ａｇｃ株式会社 車載アンテナ

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
JPH066581Y2 (ja) * 1988-03-30 1994-02-16 日本板硝子株式会社 自動車用窓ガラスアンテナ
JP4838187B2 (ja) * 2007-04-13 2011-12-14 本田技研工業株式会社 ガラスアンテナ用回路モジュール及びその組み立て方法
JP5061015B2 (ja) * 2008-04-07 2012-10-31 日本板硝子株式会社 車両用ガラスアンテナ
JP5446536B2 (ja) * 2008-09-12 2014-03-19 セントラル硝子株式会社 ガラスアンテナ
JP5332895B2 (ja) * 2009-05-18 2013-11-06 セントラル硝子株式会社 車両用ガラスアンテナ
JP5532942B2 (ja) * 2010-01-15 2014-06-25 セントラル硝子株式会社 ガラスアンテナ
JP5720308B2 (ja) 2010-06-16 2015-05-20 セントラル硝子株式会社 車両用ガラスアンテナ

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* Cited by examiner, † Cited by third party
Title
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WO2014104365A1 (fr) 2014-07-03
EP2940793A1 (fr) 2015-11-04
JPWO2014104365A1 (ja) 2017-01-19
EP2940793A4 (fr) 2016-08-17

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