EP2924803B1 - Glasantenne für Fahrzeug - Google Patents

Glasantenne für Fahrzeug Download PDF

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Publication number
EP2924803B1
EP2924803B1 EP15159789.5A EP15159789A EP2924803B1 EP 2924803 B1 EP2924803 B1 EP 2924803B1 EP 15159789 A EP15159789 A EP 15159789A EP 2924803 B1 EP2924803 B1 EP 2924803B1
Authority
EP
European Patent Office
Prior art keywords
pole side
section
positive pole
negative pole
glass antenna
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
EP15159789.5A
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English (en)
French (fr)
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EP2924803A1 (de
Inventor
Kanya Hirabayashi
Masahiro Yamamoto
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.)
Central Glass Co Ltd
Original Assignee
Central Glass Co Ltd
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Filing date
Publication date
Application filed by Central Glass Co Ltd filed Critical Central Glass Co Ltd
Publication of EP2924803A1 publication Critical patent/EP2924803A1/de
Application granted granted Critical
Publication of EP2924803B1 publication Critical patent/EP2924803B1/de
Active legal-status Critical Current
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1271—Supports; Mounting means for mounting on windscreens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
    • H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
    • H01R24/42—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency comprising impedance matching means or electrical components, e.g. filters or switches
    • H01R24/44—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency comprising impedance matching means or electrical components, e.g. filters or switches comprising impedance matching means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2201/00—Connectors or connections adapted for particular applications
    • H01R2201/02—Connectors or connections adapted for particular applications for antennas

Definitions

  • the present invention relates to a vehicular glass antenna disposed on a window glass of an automotive vehicle.
  • a vehicular glass antenna has been used for receiving electric waves in an FM band through an UHF band such as an FM broadcasting, an DAB (Digital Audio Broadcasting: a digital terrestrial radio broadcasting), and a digital terrestrial television broadcasting or for receiving the electric waves of a microwave band such as GPS.
  • a vehicular glass antenna as described above a dimension and a shape of a window glass are different depending upon a vehicle to be attached and a position of the window glass. Hence, it is often difficult to obtain a favorable antenna sensitivity.
  • a patent document 1 describes the vehicular glass antenna which obtains a sufficient antenna gain even in a narrow area.
  • a feeding terminal of such a glass antenna as described above for example, a feeding terminal constituted by a catcher as described in a patent document 2 and a connector as described in a patent document 3 is used, the catcher being equipped with a signal connection terminal section and a ground connection terminal section. Then, the signal connection terminal section is connected to an antenna side feeding section and the ground connection terminal section is connected to an earth side feeding section.
  • a patent document 4 describes the vehicular glass antenna in which a part of a conductive wire strip extended from a positive feeding point and constituted by a horizontal component and a vertical component is extended so as to close to one side of a negative feeding point and this part is closed to a second conductive wire extended from the negative feeding point so that a phase between the horizontal component and the vertical component is made different, thus electric waves of a circularly polarized wave can favorably be received.
  • Document EP 2 475 045 A1 discloses a glass antenna in accordance with the preamble of claim 1.
  • the phase adjustment can be carried out by approaching the conductor wire strip extended from the feeding point of the positive pole side to the negative side feeding point and to the second conductive wire strip extended from the negative pole side.
  • the circularly polarized wave can favorably be received.
  • a reception performance with respect to the electric wave of a certain polarized plane wave is increased, a large effect cannot be obtained.
  • the coaxial cable is connected to an antenna element, an electric current is caused to flow through an outside of the outer conductor of the coaxial cable so that the outer conductor is operated as a part of antenna and an impedance of the antenna is varied.
  • the outer conductor of the coaxial cable is grounded at a proximity section of the antenna element so that the variation of the impedance is suppressed.
  • the outer conductor of the coaxial cable is needed to be grounded at a location which is remote from the antenna element. Consequently, a distance between the antenna element and the grounded location becomes long as compared with a wavelength and an impedance of a proximity section of the antenna element becomes high.
  • an object of the present invention to provide a vehicular glass antenna which can assure a large improvement of the antenna sensitivity by easily matching an input impedance of the vehicular glass antenna with a characteristic impedance of the coaxial cable to be connected to the vehicular glass antenna, even in a case where the outer conductor of the coaxial cable is grounded at the location remote from the antenna element.
  • the vehicular glass antenna described above characterized in that, at the overlap part between the positive pole side conductor section and the negative pole side conductor section, the negative pole side conductor section is located at an upper part of the positive pole side conductor section in the vertical direction on the glass surface.
  • the vehicular glass antenna described above, characterized in that the positive pole side conductor section includes a positive pole side feeding section and a positive pole side element; the negative pole side conductor section includes the negative pole side feeding section.
  • the negative pole side conductor section further includes a negative pole side element extended from the negative pole side feeding section.
  • the vehicular glass antenna described above characterized in that a part of the positive pole side element and a part of the negative pole side element are separated from each other with an overlap gap g to form an overlap part between the positive pole side conductor section and the negative pole side conductor section.
  • the vehicular glass antenna described above, characterized in that the antenna element further includes a feeding terminal, the positive pole side conductor section includes a positive pole purpose metal fitting of the feeding terminal and the negative pole side conductor section further includes a negative pole purpose metal fitting of the feeding terminal, the positive pole purpose metal fitting or the negative pole purpose metal fitting is separated from the negative pole side feeding section or the positive pole side feeding section with an overlap gap g to form an overlap part between the positive pole side conductor section and the negative pole side conductor section.
  • the vehicular glass antenna described above characterized in that the overlap part between the positive pole side conductor section and the negative pole side conductor section is inserted between a connection point to the coaxial cable and the positive pole side element when the antenna element is connected to the coaxial cable.
  • the glass antenna according to the present invention is provided with an overlap part in which a part of the positive pole side conductor section and a part of the negative pole side conductor section, the positive pole side conductor section and the negative pole side conductor section constituting an antenna element, are separated from each other and overlapped in a vertical direction on a glass surface.
  • this separated gap is called "overlap gap g”.
  • This overlap part forms a conductance in an equivalent circuit.
  • the conductance can be adjusted by adjusting this overlap gap g and/or an area (length d x width e) of the overlap part.
  • the vehicular glass antenna described above characterized in that the overlap gap g is from 0.5mm to 1.5mm.
  • an area of the overlap part between the positive pole side conductor section and the negative pole side conductor section is 10mm 2 through 300mm 2 .
  • the vehicular glass antenna described above, characterized in that the glass antenna is a glass antenna for receiving a terrestrial digital television broadcasting.
  • the input impedance of the antenna can largely be adjusted by adjusting the overlap gap g and/or the area of the overlap part (length d x width e), the input impedance of the antenna easily matches with the characteristic impedance of the coaxial cable connected to the vehicular glass antenna according to the present invention. Thus, a large improvement of an antenna sensitivity could be achieved.
  • Figs. 1(a) through 3(b) are views of a vehicular glass antenna in each of various preferred embodiments viewed from a vehicular inside.
  • a vehicular glass antenna in each of various preferred embodiments viewed from a vehicular inside.
  • it is a direction directed from the glass surface on which the vehicular glass antenna according to the present invention is disposed toward the vehicular inside, viz., a direction denoted by an arrow mark Z in Figs. 1(a) through 3(b) .
  • the glass antenna according to the present invention can take a structure as in a first preferred embodiment shown in Figs. 1(a) and 1(b).
  • Fig. 1(b) is a view of the glass antenna in the first embodiment viewed from the vehicular inside.
  • the glass antenna in the preferred embodiment is formed on a vehicular inside surface side of the window glass.
  • Fig. 1(a) is a view representing a longitudinal cross section cut away along a center line f of a feeding terminal 2 in Fig. 1(b) .
  • the glass antenna according to the present invention takes the following structure as the positive pole side conductor section and the negative pole side conductor section constituting an antenna element 1. That is to say, as the positive pole side conductor section, a positive pole side feeding section 13 and a positive pole side element 11 are disposed on window glass 6.
  • Positive pole side element 11 is further constituted by, for example, a positive pole side element first wire strip 111 extended from positive pole side feeding section 13 and a positive pole side element second wire strip 112 branched from positive pole side element first wire strip 111, remote from positive pole side element first wire strip 111, and extended in parallel to positive pole side element first wire strip 111 on the same glass surface as the positive pole side element first wire strip 111.
  • the negative pole side conductor section includes: a negative pole side feeding section 14 disposed remotely, for example, longitudinally on the window glass from positive pole side feeding section 13; and a negative pole side element 12.
  • Negative pole side element 12 is further constituted by: for example, a negative pole side element first wire strip 121 extended from negative pole side feeding section 14; and a negative pole side element second wire strip 122 extended similarly from negative pole side feeding section 14, remotely disposed from negative pole side element first wire strip 121, and extended in parallel to negative pole side element first strip 121 on the same glass surface.
  • feeding terminal 2 is used to connect a coaxial cable 3 to connect between a receiver (not shown) and antenna element 1 of the vehicular glass antenna in this embodiment.
  • the structure of feeding terminal 2 will be described later.
  • a distance between antenna element 1 and a ground location of an outer contact of coaxial cable 3 is 20cm and, in an ordinary case, the distance is equal to or shorter than 25cm. If the distance becomes longer than 25cm, a high frequency wave current flowing through the outer conductor of the coaxial cable is often resonated. Thus, this is not preferable.
  • Feeding terminal 2 used in the glass antenna in this embodiment includes: a catcher 21 previously connected to the vehicular inside surface of a window glass 6 as shown in Fig. 1(a) ; and a connector 25 connected to catcher 21.
  • One end of coaxial cable 3 is connected to connector 25 and the other end of coaxial cable 3 is connected to the receiver.
  • a positive pole purpose metal fitting 22 and a negative pole purpose metal fitting 23 are remotely disposed and faced against each other with an overlap gap g from window glass 6.
  • Positive pole purpose metal fitting 22 includes: a positive pole side contact 221; and a positive pole purpose metal fitting housing section 222 connected from positive pole side contact 221 and arranged on a rear surface of catcher 21.
  • Positive pole side contact 221 is connected to positive pole side feeding section 13 by means of a soldering and/or a conductive adhesive.
  • positive pole side metal fitting housing section 222 includes an inclination section 222a at the connection location with positive pole side contact 221.
  • gap g can be formed between a part of positive pole purpose metal fitting housing section 222 and window glass 6.
  • Negative pole purpose metal fitting 23 includes: a negative pole side contact 231; and a negative pole purpose metal fitting housing section 232 connected from negative pole side contact 231 and arranged onto the rear surface of catcher 21. Negative pole side contact 231 is connected to negative pole side feeding section 13 by means of the soldering and/or conductive adhesive.
  • negative pole side metal fitting housing section 232 includes an inclination section 232a at the connection location with positive pole side contact 231. When feeding terminal 2 is attached onto window glass 6, gap g can be formed between a part of negative pole purpose metal fitting housing section 232 and window glass 6.
  • positive pole purpose metal fitting 22 constitutes a part of the positive pole side conductor section and negative pole purpose metal fitting 23 constitutes a part of the negative pole side conductor section.
  • the positive pole side conductor section is constituted by positive pole side feeding section 13, positive pole side element 11, and positive pole purpose metal fitting 22.
  • Negative pole side conductor section is constituted by negative pole side feeding section 14, negative pole side element 12, and negative pole purpose metal fitting 23.
  • negative pole side feeding section 14 includes: a negative pole side feeding section first section 141 to be connected to negative pole side contact 231; and a negative pole feeding section second section 142 formed to be extended from negative pole side feeding section first section 141 toward a direction of positive pole side feeding section 13.
  • a width of negative pole side feeding first section 141 and a width of negative pole side feeding section second section 142 are the same.
  • the width of negative pole side feeding section second section 142 can be varied regardless of the width of negative pole side feeding section first section 141.
  • positive pole purpose metal fitting housing section 222 is formed to be extended from positive pole side feeding section 13 toward the direction of negative pole side feeding section 14. Then, a part of a lower end side of positive pole purpose metal fitting housing section 222 and a part of an upper end side of negative pole side feeding section second section 142 form an overlap part between the positive pole side conductor section and the negative pole side conductor section with a width e, a length d, and an overlap gap g. In this way, negative pole side feeding section second section 142 is disposed to be overlapped on positive pole purpose metal fitting housing section 222 with a gap in an upward direction.
  • width e, length d, and a length of overlap gap g are 6mm, 15mm, and 1mm, respectively, and an area (length d x width e) of the overlap part is 90mm 2 .
  • the overlap part between the positive pole side conductor section and the negative pole side conductor section is formed so that a circuit as shown in an equivalent circuit diagram shown in Fig. 5 is formed.
  • an impedance denoted by Z 1 represents an input impedance in a case where the glass antenna is not provided with the overlap part between the positive pole side conductor section and the negative pole side conductor section as in the case of the first preferred embodiment according to the present invention.
  • R 1 denotes a radiation resistance representing a consumption of an electric wave radiated toward a space
  • L 1 and C 1 denote an inductance of the antenna and a conductance of the antenna, respectively
  • Z 1 can be expressed in the following equation 1.
  • Z 1 j ⁇ L 1 ⁇ 1 C 1 + R 1
  • this overlap part forms a conductance C 2 .
  • an impedance Z 2 in parallel to impedance Z 1 is provided. Impedance Z 2 is expressed by conductance C 2 in the following equation 2.
  • Z 2 1 j ⁇ C 2
  • the glass antenna in the first preferred embodiment provides a parallel circuit between Z 1 and Z 2 .
  • a magnitude of Z 2 can be adjusted by adjusting overlap gap g of the overlap part between the positive pole side conductor section and the negative pole side conductor section, the area (d x e) of the overlap part, and so forth.
  • the input impedance of the glass antenna in this embodiment can be closed to the characteristic impedance of coaxial cable 3 to which the glass antenna in the first embodiment is connected. Hence, a transmission loss can be reduced and it becomes possible to improve the antenna sensitivity.
  • overlap gap g is 0.5 ⁇ 1.5mm. It is more preferable that overlap gas g is 0.7 ⁇ 1.3mm. As overlap gap g is made narrower, an electric capacitance becomes larger and the impedance can be reduced. However, there is a tendency that a manufacturing of the terminal structure becomes difficult.
  • the area (d x e) of the overlap part is 10 ⁇ 300mm 2 although it depends upon the impedance of the antenna to be matched. It is more preferable that the area is 30 ⁇ 150mm 2 . If the area of the overlap part is wider, the electrical capacitance is made larger and the impedance can be reduced.
  • the glass antenna according to the present invention can take the structure as a second preferred embodiment shown in Figs. 2(a) and 2(b) .
  • Fig. 2(b) is a view of the vehicular glass antenna in the second preferred embodiment viewed from the vehicular inside and the vehicular antenna in this embodiment is formed on a vehicular inside surface of the window glass.
  • Fig. 2(a) is a view of the vehicular window glass antenna representing a longitudinally cross section cut away along center line f of feeding terminal 2 in Fig. 2(b) .
  • feeding terminal 2 is used to connect coaxial cable 3 which connects between the receiver and the antenna element of the window glass antenna in this embodiment.
  • a part of the positive pole side conductor section is located at an upper part in a vertical direction of the glass surface with respect to a part of the negative pole side conductor section to constitute an overlap part between the positive pole side conductor section and the negative pole side conductor section.
  • negative pole side feeding section 14 includes: negative pole side feeding section first section 141 to which negative pole side contact 231 of feeding terminal 2 is connected; and negative pole side feeding section second section 142 connected to negative pole side feeding section first section 141 and extended toward the direction of positive pole side feeding section 13.
  • positive pole side feeding section 13 includes: a positive pole side feeding section first section 131 to which the positive pole side contact of feeding terminal 2 is connected; and a positive pole side feeding section second section 132 connected to positive pole side feeding section first section 131 and extended toward the direction of negative pole side feeding section 14 from a lower side of positive pole side feeding section first section 131 by a length j.
  • positive pole purpose metal fitting housing section 222 constituting feeding terminal 2 is extended toward the direction of negative pole purpose metal fitting housing section 232 and is formed to be an overlap part to overlap on negative pole side feeding section second section 142 with overlap gap g.
  • negative pole purpose metal fitting housing section 232 constituting feeding terminal 2 is extended toward the direction of positive pole side metal fitting housing section 222 and forms the overlap part with positive pole side feeding section second section 132 with width e, length d, and overlap gap g to constitute the overlap part between the positive pole side conductor section and the negative pole side conductor section.
  • positive pole side feeding section second section 132 is used to overlap negative pole side metal fitting housing section 232, space apart from negative pole purpose metal fitting housing section 232 by overlap gap g. Since, in many of feeding terminal 2, the length of negative pole purpose metal fitting housing section 232 is longer than that of positive pole purpose metal fitting housing section 222, in a case where feeding terminal 2 is used to form the overlap part between the positive pole side conductor section and the negative pole side conductor section, it is desirable to form the structure of the glass antenna in the second embodiment.
  • positive pole side element first wire strip 111 constituting positive pole side element 11 is connected to positive pole side feeding section first section 131.
  • the other parts of the glass antenna in the second embodiment are the same as the structure of the glass antenna in the first embodiment.
  • a width of positive pole side feeding section second section 132 is narrower than a lateral width of positive pole side feeding section first section 131 constituting positive pole side feeding section 13.
  • positive pole side feeding section second section 132 is connected to positive pole side feeding section first section 131 so that a right side of positive pole side feeding section second section 132 is connected to a right side of positive pole side feeding section first section 131.
  • positive pole side feeding section 13 and negative pole side feeding section 14 are denoted by oblique lines and positive pole purpose metal fitting 22 and negative pole purpose metal fitting 23 are denoted by dot lines.
  • width e, length d, and the length of overlap gap g are 3mm, 15mm, and 1mm, respectively, and area (length d x width e) of the overlap part is 45mm 2 .
  • the window glass antenna according to the present invention can take the third preferred embodiment shown in Figs. 3(a) and 3(b).
  • Fig. 3(b) is a view of the window glass antenna in the third preferred embodiment viewed from the vehicular inside.
  • the glass antenna in the third preferred embodiment is formed on the vehicular inside surface of the window glass.
  • Fig. 3(a) is a view representing a longitudinally cross section cut away along center line f of feeding terminal 2 shown in Fig. 3(b) .
  • feeding terminal 2 is used to connect coaxial cable 3 which connects between the receiver and the glass antenna in this embodiment in the same way as the glass antenna in the second preferred embodiment.
  • Feeding terminal 2 is denoted by the dot line in Fig. 3(b) in the same way as the second preferred embodiment in Fig. 2(b) .
  • a location at which positive pole side element first wire strip 111 is connected to positive pole side feeding section second section 132 is a terminal section of negative pole side feeding section 14 side. This is a difference point from glass antenna 1 in the second preferred embodiment and the other structures of the window glass antenna in the third embodiment are the same as that in the second embodiment.
  • the overlap part between the positive pole side conductor section and the negative pole side conductor section is interposed between positive pole side element first wire strip 111 and coaxial cable 3 connected to the receiver.
  • the above-described structure is taken so that width e and length d of the overlap part between the positive pole side conductor section and the negative pole side conductor section are variably adjusted.
  • the input impedance in the desired frequency band of the glass antenna in the third preferred embodiment is easier to be varied than the glass antenna in the second preferred embodiment.
  • the input impedance is easily matched with the characteristic impedance of coaxial cable 3.
  • width e, length d, and the length of overlap gap g are 3mm, 15mm, and 1 mm, respectively, and area (length d x width e) of the overlap part is 45mm 2 .
  • positive pole side element first wire strip 111 is structured so that the overlap part between a part of the positive pole conductor section and a part of the negative pole conductor section with overlap gap g is interposed between positive pole side element first wire strip 111 and a core wire of coaxial cable 3 connected to the receiver.
  • a larger influence due to the variation of the length, the width, and the gap of the overlap part is received than glass antenna 1 in the second preferred embodiment.
  • the adjustment of the input impedance of window glass antenna 1 is easier to be carried out than the glass antenna in the second preferred embodiment.
  • a generally available conductive ceramic paste can be used for positive pole side element 11, negative pole side element 12, positive pole side feeding section 13, and negative pole side feeding section 14 from among antenna element 1 of the glass antenna according to the present invention in the same way as forming a defogger of the rear window glass (rear windshield), can be printed in the same method as the defogger, and can be baked through a heating furnace.
  • a hard conductive plate material for example, a copper plate or an aluminum plate is bent, or an insulating characteristic spacer is inserted, the conductive ceramic paste is coated along the spacer, or copper foil is adhered, or use of a feeding terminal as will be described later can be formed so that one of the positive pole side feeding section and the negative pole side feeding section which is upper than the other can be separated by the overlap gap g from the lower side feeding section.
  • overlap gap g between positive pole side contact 221 of positive pole side contact 221 of positive pole purpose metal fitting 22 and positive pole purpose metal fitting housing section 222 and overlap gap g between negative pole side contact 231 of the negative pole purpose metal fitting 23 and negative pole purpose metal fitting housing section 232 are constant and cannot be altered.
  • positive pole purpose metal fitting 22 and negative pole purpose metal fitting 23 a metallic plate is generally used and, as the metallic plate, for example, a brass or copper alloy is used and a tin-plating is treated on the surface to facilitate the soldering.
  • the first preferred embodiment through the third preferred embodiment indicate the glass antenna in which positive pole side feeding section 13 and negative pole side feeding section 14 are provided on the window glass.
  • the core wire and the outer conductor of coaxial cable 3 extended from the receiver are directly or via feeding terminal 2 connected to positive pole side feeding section 13 and negative pole side feeding section 14, respectively.
  • the vehicular glass antenna according to the present invention is mounted at a location of the vehicular window glass which is inconspicuous from a vehicular occupant.
  • the feeding section of the glass antenna according to the present invention is provided on left or right side of the upper side of the front window glass as shown in Fig. 6 , on an upper part margin section of a defogger 7 of the rear window glass as shown in Fig. 7 , and on a proximity of a side of the side glass as shown in Fig. 8 .
  • Feeding terminal used in the window glass antenna according to the present invention >
  • FIG. 4(a), 4(b), and 4(c) The structure of feeding terminal 2 used in the first through third preferred embodiments are shown in Figs. 4(a), 4(b), and 4(c).
  • Fig. 4(a) is a view of feeding terminal 2 viewed from a lower side of feeding terminal
  • Fig. 4(b) is a view of feeding terminal 2 viewed from an upper side of feeding terminal
  • Fig. 4(c) is a view of feeding terminal 2 viewed from a side of feeding terminal 2.
  • a catcher 21 is depicted and, at the lower part, connector 25 is depicted.
  • Catcher 21 includes: a box-shaped housing 24 having an opening at an upper side to fit connector 25 thereinto to fix the connector at a predetermined position; positive pole purpose metal fitting 22; and negative pole purpose metal fitting 23.
  • Positive pole purpose metal fitting 22 includes: a positive pole side contact 221 connected to positive pole side feeding section 13 disposed on the window glass; and a positive pole purpose metal fitting housing section 222 arranged on a lower side of housing 24. Then, positive pole purpose metal fitting housing section 222 is provided with an inclination section 222a faced against the positive pole side contact 221. Therefore, when catcher 21 is disposed on the window glass, an upward gap is provided between a surface of the window glass and housing 24 as shown in Fig. 4(c) .
  • Negative pole purpose metal fitting 23 includes: a negative pole side contact 231 connected to negative pole side feeding section 14 disposed on the window glass; and a negative pole purpose metal fitting housing section 232 disposed on a lower surface of housing 24, in the same way as positive pole side metal fitting 22.
  • negative pole purpose housing section 232 is provided with an inclination section 232a against negative pole side contact 231. Therefore, when catcher 21 is disposed on the window glass, an upward gap is provided between the surface of the window glass and housing 24 when catcher 21 is disposed on the window glass.
  • Positive pole purpose metal fitting housing section 222 is provided with a positive pole purpose catcher side engagement section 223 of a pin shape and penetrated through a lower surface of housing 24 along a center line f in a forward-and-rearward direction of the housing as shown in Fig. 4(b) .
  • negative pole side metal fitting housing section 232 is provided with a negative pole purpose catcher side engagement section 233 penetrated through a lower surface of housing 24 and disposed along an inner wall of the side surface of the housing.
  • Connector 25 is of a box shape which matches with an upper opening of housing 24.
  • Connector 25 includes: a positive pole purpose connector side engagement section 251 in which positive pole purpose catcher side engagement section 223 of catcher 21 is inserted to connect with a core wire side of coaxial cable 3 when connector 25 is fitted into catcher 21, as shown in Fig. 4(a) ; and a negative pole purpose connector side engagement section 252 contacted on negative pole purpose catcher section engagement section 233 provided on an inside side surface of housing 24 of catcher 22 to connect to the outer conductor of coaxial cable 3 when connector 25 is fitted into catcher 21, as shown in Figs. 4(a) and 4(b) .
  • Connector 25 is connected to coaxial cable 3.
  • the core wire of coaxial cable 3 is connected to positive pole purpose connector side engagement section 251 and the outer conductor of coaxial cable 3 is connected to negative pole purpose connector side engagement section 252.
  • Positive pole purpose connector side engagement section 251 is of a cylindrical conductor into which pin shaped positive pole purpose catcher side engagement section 223 is inserted to be contacted and a conduction is obtained.
  • Negative pole purpose connector side engagement section 252 is a plate-like conductor disposed on an outer side surface of connector 25 and a conduction is obtained when it is contacted on negative pole side catcher side engagement section 233.
  • the glass antenna in an execution example is the glass antenna in the third preferred embodiment shown in Figs. 3(a) and 3(b) .
  • feeding terminal 2 is used to connect to coaxial cable 3 which connects between antenna element 1 of the glass antenna in the third preferred embodiment and the receiver.
  • positive pole side feeding section 13 negative pole side feeding section 14
  • positive pole side element 11 extended from positive pole side feeding section 13 and negative pole side element 12 extended from negative pole side feeding section 14 are provided.
  • Positive pole side feeding section 13 includes: a positive pole side feeding section first section 131 connected to positive pole side contact 221 of feeding terminal 2; and positive pole side feeding section second section 132 connected to positive pole side feeding section 131 and extended toward the direction of negative pole side feeding section 14.
  • a right side of positive pole side feeding section second section 132 is connected to the right side of positive pole side feeding section first section 131 so as to coincide with the right side of the positive pole side feeding section first section 131.
  • Positive pole side element 11 includes positive pole side element first wire strip 111 and positive pole side element second wire strip 112. One end of positive pole side element first strip 111 is connected to a terminal section of positive pole side feeding section second section 132 away from the positive pole side feeding section first section 131. Positive pole side element first wire strip 111 is extended toward the direction separate from positive pole side feeding section 13. Then, positive pole side element second wire strip 112 is connected to a midway section of positive pole side element first wire strip 111 and extended in parallel to positive pole side element first strip 111 in a plane direction of the window glass.
  • Negative pole side element 12 includes a negative pole side element first wire strip 121 and a negative pole side element second wire strip 122.
  • One end of negative pole side element first strip 121 is connected to negative pole side feeding section 14 and extended in a direction separate from negative pole side feeding section 14.
  • negative pole side element second wire strip 122 is connected to negative pole side feeding section 14 and extended so as to be parallel to negative pole side element first wire strip 121.
  • Positive pole side feeding section 13 and negative pole side feeding section 14 are connected to positive pole side contact 221 of positive pole purpose metal fitting 22 of feeding terminal 2 and negative pole side contact 231 of negative pole purpose metal fitting 23, respectively, by means of soldering.
  • the core wire and the outer conductor of coaxial cable 3 are connected to positive pole side feeding section 13 and negative pole side feeding section 14 via positive pole purpose metal fitting 22 and negative pole purpose metal fitting 23, respectively.
  • Positive pole purpose metal fitting 22 includes positive pole side contact 221 and positive pole purpose metal fitting housing section 222.
  • An inclination section 222a is provided between positive pole side contact 221 and positive pole purpose metal fitting housing section 222.
  • Negative pole side metal fitting 23 is constituted by negative pole side contact 231 and negative pole purpose metal fitting housing section 232.
  • Inclination section 232a is provided between negative pole side contact 231 and negative pole purpose metal fitting housing section 232. Then, when feeding terminal 2 is attached onto the window glass, inclination sections 222a and 232a provide an upward gap among the surface of the window glass, positive pole purpose metal fitting housing section 222, and negative pole purpose metal fitting housing section 232.
  • Negative pole purpose metal fitting housing section 232 is extended toward the direction of positive pole purpose metal fitting housing section 222.
  • Positive pole side feeding second section 132 is extended toward the direction of negative pole side feeding section 14 so that a part of negative pole purpose metal fitting housing section 232 and a part of positive pole side feeding section second section 132 are separated and overlapped with overlap gap g to form the overlap part.
  • Negative pole purpose metal fitting housing section 232 becomes slim with respect to the width of the bottom surface of housing 24 and a part of negative pole purpose metal fitting housing section 232 is approximately the same width of the bottom surface of housing 24. This is because a fastener is formed to fix negative pole purpose metal fitting 23 to housing 24.
  • Feeding terminal 2 is installed in such a way that its center line f is coincident with center lines in width directions of positive pole side feeding section first section 131 and negative pole side feeding section 14.
  • Positive pole side feeding section first section 131 width 12mm x length 12mm.
  • Positive pole side feeding section second section 132 width 6mm x length 26mm.
  • Positive pole side element first wire strip 111 125mm
  • An interval between positive pole side element first strip 111 and positive pole side element second wire strip 112 10mm.
  • a connection point of positive pole side element second wire strip 112 to positive pole side element first wire strip 111 a location of 120mm from a tip of positive pole side element first wire strip 111.
  • Negative pole side element first strip 121 40mm.
  • Negative pole side element second strip 122 50mm.
  • An interval between negative pole side element first wire strip 121 and negative pole side element second wire strip 122 10mm.
  • An interval between positive pole side element second wire strip 112 and negative pole side element first wire strip 121 5mm.
  • a length d of the overlap part between positive pole side feeding section second section 132 and negative pole purpose metal fitting housing section 232 with overlap gap g separated from each other 15mm
  • a width e of the overlap part between positive pole side feeding section second section 132 and negative pole purpose metal fitting housing section 232 with overlap gap g separated from each other 3mm.
  • Overlap gap g of the overlap part between positive pole side feeding section second section 132 and negative pole purpose metal fitting housing section 232 with overlap gap g separated from each other 1mm.
  • each wire strip is 0.7 mm.
  • the following reference examples show how the input impedance of the glass antenna is varied when the width and length of the overlap part between positive pole side feeding section second section 132 and negative pole purpose metal fitting 23 are varied by changing variously the magnitude of positive pole side feeding section second section 132 in the antenna shape of the execution example using a simulation.
  • a reference example 1 indicates a simulation result.
  • the glass antenna in reference example 1 is structured as shown in Fig. 9 .
  • the structure and dimension of the glass antenna in reference example 1 are the same as the glass antenna in the execution example except the lengths of positive pole side feeding section second section 132 and positive pole side element first wire strip 111.
  • positive pole side contact 221 and negative pole side contact 231 are connected to positive pole side feeding section first section 131 and negative pole side feeding section 14.
  • positive pole purpose metal fitting 22 and negative pole purpose metal fitting 23 are line contacted on positive pole side feeding section first section 131 and negative pole side feeding section 14, respectively, to provide a positive pole side contact point 224 and negative pole side contact point 234.
  • the width of positive pole side feeding section second section 132 is 1mm and constant and the length of positive pole side element first wire strip 111 is extended by a leftward movement of positive pole side feeding second section 132.
  • the antenna is arranged in a proximity of the center of the glass plate.
  • FIG. 12 A result of the input impedance of the glass antenna in this execution example obtained by the simulation in reference example 1 is shown in Fig. 12 .
  • a longitudinal axis in Fig. 12 denotes the input impedance of glass antenna 1 of this reference example at the calculated frequencies and a lateral axis denotes the leftward movement of the right side of positive pole side feeding section 132 up to 10mm, when the right side of positive pole side feeding section second section 132 is coincident with the right side of positive pole side feeding section first section 131, viz., with (point a) as 0mm.
  • a solid line denotes the variation of the input impedance at 600MHz
  • a dot line denotes the variation of the input impedance at 700MHz
  • a dot-and-dash line denotes the variation of the input impedance at 500MHz.
  • Reference example 2 also indicates the simulation result.
  • Glass antenna 1 in reference example 2 is shown in Fig. 10 .
  • the dimension and the structure of reference example 2 are the same as the glass antenna in the execution example except the lengths of positive pole side feeding section second section 132 and positive pole side element first wire strip 111.
  • the conditions of the simulation are the same as those of reference example 1.
  • the width of positive pole side feeding section second section 132 is, at first, 1mm and the length of positive pole side feeding section second section 132 is constant
  • condition 1 a case where, in a state where the right side of positive pole side feeding section second section 132 is made coincident with the right side of positive pole side feeding section first section 131 (point a), the width of positive pole side feeding section second section 132 is widened toward the leftward direction:
  • condition 2 a case where, in a state (point b) where the center line in the lengthwise direction of positive pole side feeding section second section 132 is fixed at a position at which the center line of the lengthwise direction of positive pole side feeding section second section 132 matches with the lengthwise center line of positive pole side feeding first section 131, the width of positive pole side feeding section second section 132 is widened in the leftward and rightward directions.
  • condition 1 is shown in Fig. 13 and condition 2 is shown in Fig. 14 .
  • a longitudinal axis of Fig. 13 denotes the input impedance of the glass antenna in condition 1 of reference example 2 at the calculated frequencies and a lateral axis of Fig. 13 denotes a width of positive pole side feeding section second section 132.
  • a solid line denotes the variation of the input impedance at 600MHz
  • a dot line denotes the variation of the input impedance at 700MHz
  • a dot-and-dash line denotes the variation of the input impedance at 500MHz.
  • the width of feeding terminal 2 is 6mm and center line f of feeding terminal 2 in a lengthwise direction of feeding terminal 2 is overlapped on the center line of positive pole side feeding section first section 131.
  • the width of positive pole side feeding section second section 132 is larger than 3mm, the overlap part is formed between positive pole side feeding section second section 132 and negative pole purpose metal fitting housing section 232.
  • the width of overlap of the overlap part is 6mm or larger, namely, the overlap value of the overlap part corresponds to 9mm or larger in Fig. 13 . It is appreciated that when negative pole purpose metal fitting housing 232 is overlapped on positive pole side feeding section second section 132 in the width direction, the input impedance is not largely varied.
  • the width is not widened but the length of the overlap part may be varied and overlap gap g may be varied.
  • a viewpoint is the same as Fig. 13 .
  • the width of positive pole side feeding section second section 132 becomes equal to or larger than 6mm which is the same as the width of negative pole purpose metal fitting housing section 232, the value of the input impedance is not largely varied.
  • the width of the overlap part between positive pole side feeding section second section 132 and negative pole purpose metal fitting housing 232 with overlap gap g is previously matched with the width of one of positive pole side feeding section second section 132 and negative pole purpose metal fitting housing section 232 which is wider than the other and it is efficient to vary the length of the overlap part.
  • a reference example 3 indicates the simulation result.
  • Glass antenna 1 in reference example 3 has the structure shown in Fig. 11 .
  • the dimension and structure of glass antenna in reference example 3 are the same as those of reference examples 1 and 2.
  • the condition of the simulation is the same as reference examples of 1 and 2.
  • the difference point is that, in reference example 3, the width of positive pole side feeding section second section 132 is constant but the length of positive pole side feeding section second section 132 is varied. Since, in reference example 3, the length of positive pole side feeding second section 132 is only varied, the length of positive pole side element first wire strip 111 is constant.
  • the width of positive pole side feeding section second section 132 is 12mm and constant but the length of positive pole side feeding section second section 132 is varied from 10mm to 25mm.
  • the length of positive pole side feeding section second section 132 is larger than 11mm, positive pole side feeding section second section 132 and negative pole purpose metal fitting housing section 232 are overlapped on each other with overlap gap g to form the overlap part.
  • Fig. 15 The result of the input impedance of the glass antenna in reference example 3 obtained in the simulation of this reference example is shown in Fig. 15 .
  • the longitudinal axis denotes the input impedance of glass antenna 1 in the execution example at the calculated frequencies and the lateral axis denotes the length of positive pole side feeding section second section 132.
  • the solid line denotes the variation of the input impedance at 600MHz
  • the dot line denotes the variation of the input impedance at 700MHz
  • the dot-and-dash line denotes the variation of the input impedance at 500MHz.
  • the length of positive pole side feeding section second section 132 is approximately 20mm, namely, length d of the overlap part is approximately 9mm
  • the value of the input impedance of glass antenna in this reference example at each of 600MHz, 700Mhz, and 500MHz which is close to characteristic impedance 50 ⁇ of the coaxial cable connected to glass antenna in this reference example is obtained and, thus, the favorable antenna sensitivity is obtained.

Landscapes

  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Claims (8)

  1. Fahrzeugscheibenantenne, die ein Antennenelement (1) umfasst,
    wobei das Antennenelement (1) aus einem Leiterabschnitt der positiven Polseite und einem Leiterabschnitt der negativen Polseite besteht; ein Teil des Leiterabschnitts der positiven Polseite und ein Teil des Leiterabschnitts der negativen Polseite voneinander getrennt sind und einander mit einem Überlappungsspalt g in einer vertikalen Richtung bezüglich einer Scheibenoberfläche überlappen, wenn sie an der Scheibenoberfläche montiert sind, um ein überlappendes Teil zu bilden, wobei
    der Leiterabschnitt der positiven Polseite einen Einspeiseabschnitt (13) der positiven Polseite und ein Element (11) der positiven Polseite enthält; der Leiterabschnitt der negativen Polseite einen Einspeiseabschnitt (14) der negativen Polseite enthält,
    wobei das Antennenelement (1) ferner einen Einspeiseanschluss (2) enthält, um ein Koaxialkabel (3) mit einem Empfänger zu verbinden,
    dadurch gekennzeichnet, dass
    der Einspeiseanschluss (2) ein Metallanschlussteil (22) zur Verwendung mit dem positiven Pol und ein Metallanschlussteil (23) zur Verwendung mit dem negativen Pol umfasst,
    wobei der Leiterabschnitt der positiven Polseite das Metallanschlussteil (22) zur Verwendung mit dem positiven Pol des Einspeiseanschlusses (2) enthält und der Leiterabschnitt der negativen Polseite ferner das Metallanschlussteil (23) zur Verwendung mit dem negativen Pol des Einspeiseanschlusses (2) enthält, wobei das Metallanschlussteil (22) zur Verwendung mit dem positiven Pol von dem Einspeiseabschnitt (14) der negativen Polseite getrennt ist, oder das Metallanschlussteil (23) zur Verwendung mit dem negativen Pol von dem Einspeiseabschnitt (13) der positiven Polseite durch einen Überlappungsspalt g getrennt ist, um einen überlappenden Teil zwischen dem Leiterabschnitt der positiven Polseite und dem Leiterabschnitt der negativen Polseite zu bilden.
  2. Fahrzeugscheibenantenne nach Anspruch 1,
    dadurch gekennzeichnet, dass
    an dem überlappenden Teil zwischen dem Leiterabschnitt der positiven Polseite und dem Leiterabschnitt der negativen Polseite der Leiterabschnitt der negativen Polseite an einem oberen Teil des Leiterabschnitts der positiven Polseite in der vertikalen Richtung auf der Scheibenoberfläche angeordnet ist.
  3. Fahrzeugscheibenantenne nach Anspruch 1,
    dadurch gekennzeichnet, dass
    der Leiterabschnitt der negativen Polseite ferner ein Element (12) der negativen Polseite enthält, das sich von dem Einspeiseabschnitt (14) der negativen Polseite weg erstreckt.
  4. Fahrzeugscheibenantenne nach einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass
    das überlappende Teil zwischen dem Leiterabschnitt der positiven Polseite und dem Leiterabschnitt der negativen Polseite zwischen einen Verbindungspunkt mit dem Koaxialkabel (3) und dem Element (11) der positiven Polseite eingeführt wird, wenn das Antennenelement (1) mit den Koaxialkabel (3) verbunden wird.
  5. Fahrzeugscheibenantenne nach einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass
    der Überlappungsspalt g in einem Bereich von 0,5 mm bis 1,5 mm liegt.
  6. Fahrzeugscheibenantenne nach einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass
    eine Fläche des überlappenden Teils zwischen dem Leiterabschnitt der positiven Polseite und dem Leiterabschnitt der negativen Polseite 10 mm2 bis 300 mm2 beträgt.
  7. Fahrzeugscheibenantenne nach einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass
    die Scheibenantenne eine Scheibenantenne zum Empfangen einer terrestrischen digitalen Fernsehsendung ist.
  8. Fahrzeugscheibenantenne nach einem der vorstehenden Ansprüche,
    gekennzeichnet durch
    eine Verwendung der Fahrzeugscheibenantenne zum Empfangen einer DAB, einer digitalen Audiosendung.
EP15159789.5A 2014-03-26 2015-03-19 Glasantenne für Fahrzeug Active EP2924803B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014062907 2014-03-26
JP2015036454A JP6507713B2 (ja) 2014-03-26 2015-02-26 自動車用ガラスアンテナ

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Publication Number Publication Date
EP2924803A1 EP2924803A1 (de) 2015-09-30
EP2924803B1 true EP2924803B1 (de) 2019-02-27

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201608383D0 (en) 2016-05-12 2016-06-29 Pilkington Group Ltd Connector for antennas, a glazing comprising the connector and an antenna system comprising the connector
WO2019225321A1 (ja) * 2018-05-25 2019-11-28 セントラル硝子株式会社 円偏波受信用ガラスアンテナ

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Publication number Priority date Publication date Assignee Title
JPH05315824A (ja) * 1992-03-13 1993-11-26 Asahi Glass Co Ltd 車両用ガラスアンテナ
DE19605999C2 (de) * 1996-02-17 1999-10-14 Daimler Chrysler Ag Kontaktierung einer flächigen Antennenleiterstruktur
DE10129664C2 (de) * 2001-06-20 2003-04-30 Saint Gobain Sekurit D Gmbh Antennenscheibe mit einem Hochfrequenzbauteil
JP2003273625A (ja) 2002-03-18 2003-09-26 Central Glass Co Ltd 車両用ガラスアンテナ
JP4064978B2 (ja) * 2004-05-28 2008-03-19 株式会社デンソー 車載アンテナの搭載構造
JP4159593B2 (ja) 2006-06-28 2008-10-01 原田工業株式会社 回路基板内蔵コネクタ及びキャッチャ
JP4955462B2 (ja) 2007-06-01 2012-06-20 原田工業株式会社 キャッチャ端子構造
JP5278673B2 (ja) * 2008-02-18 2013-09-04 ミツミ電機株式会社 アンテナ装置および複合アンテナ装置
JP5141503B2 (ja) * 2008-11-07 2013-02-13 旭硝子株式会社 車両用ガラスアンテナ及び車両用窓ガラス
JP5428790B2 (ja) * 2009-11-16 2014-02-26 セントラル硝子株式会社 車両用ガラスアンテナ
JP5671971B2 (ja) * 2010-11-25 2015-02-18 セントラル硝子株式会社 車両用アンテナ
JP2012142220A (ja) * 2011-01-05 2012-07-26 Honda Tsushin Kogyo Co Ltd アンテナ用コネクタ

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JP2015195574A (ja) 2015-11-05
JP6507713B2 (ja) 2019-05-08
EP2924803A1 (de) 2015-09-30
CN104953231B (zh) 2018-03-16
CN104953231A (zh) 2015-09-30

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