WO2009064003A1 - 車両用アンテナ装置 - Google Patents
車両用アンテナ装置 Download PDFInfo
- Publication number
- WO2009064003A1 WO2009064003A1 PCT/JP2008/070835 JP2008070835W WO2009064003A1 WO 2009064003 A1 WO2009064003 A1 WO 2009064003A1 JP 2008070835 W JP2008070835 W JP 2008070835W WO 2009064003 A1 WO2009064003 A1 WO 2009064003A1
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- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- loop antenna
- vehicle
- loop
- conductor
- Prior art date
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
-
- 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 antenna device.
- the present invention relates to a vehicular antenna apparatus comprising a plurality of loop antennas used by being attached to a peripheral portion of a front glass of a vehicle.
- radio waves received by vehicles were mainly AM waves for medium radio waves (M W), FM radio and TV V ultra-short waves (V H F), and ultra-high frequency waves (U H F).
- antennas for transmitting and receiving high-frequency radio waves such as antennas for GPS (Global Positioning System) and antennas for receiving terrestrial digital broadcasts, are also being installed in vehicles.
- the terrestrial digital TV is hereinafter referred to as D TV.
- the position of the three-way antenna is generally the front glass of a vehicle. If the antenna is attached to the glass, it is the art of the glass.
- the antenna is formed on a transparent film sheet and is attached to the front glass with an adhesive (for example, a special 2 0 0 6 1 2 7 0 6 0 2 No.)
- an adhesive for example, a special 2 0 0 6 1 2 7 0 6 0 2 No.
- the conventional loop antenna mounted on the top of the windshield to receive DTV broadcasts has a directivity in the front of the vehicle, which makes it difficult to receive when the vehicle changes its direction of travel.
- a diversity antenna device that installs a DTV antenna on the rear glass of the vehicle and selects and receives the radio wave with the better reception sensitivity.
- this diversity antenna device requires an antenna switching circuit and a receiving wave synthesis circuit, and is difficult to install and has a high installation cost.
- the present invention improves the reception directivity of DTV transmission by providing a minimum number of loop antennas that have a change in directivity on the windshield of the vehicle, regardless of the direction of travel of the vehicle.
- the purpose is to provide an inexpensive and easy-to-install vehicle antenna device that can receive DTV broadcasts satisfactorily.
- a vehicle antenna device that achieves the above object includes a loop antenna having directivity in a direction parallel to the front-rear direction of the vehicle, and directivity in a direction deviating from the direction parallel to the front-rear direction of the vehicle.
- the loop antenna has a directivity in a direction parallel to the front-rear direction of the vehicle, and has two feed terminals to the left and right of the loop antenna.
- the loop antenna which is located symmetrically with respect to the center line that bisects and has directivity in a direction away from the direction parallel to the longitudinal direction of the vehicle, has two feed terminals that bisect the loop antenna left and right It is characterized by being offset on either side with respect to the center line.
- Such a vehicle antenna device has the following three forms.
- a loop antenna having directivity in a direction parallel to the front-rear direction of the vehicle is a first loop installed at the upper left of the window as viewed from the passenger compartment.
- the loop antenna which is composed of a loop antenna and a second loop antenna installed at the upper right of the window, has directivity in a direction away from the direction parallel to the front-rear direction of the vehicle.
- the third loop antenna is installed adjacent to the right side of the second loop antenna, and the fourth loop antenna is installed adjacent to the left side of the second loop antenna.
- a loop antenna having directivity in a direction parallel to the front-rear direction of the vehicle is installed at the upper right of the window and the first loop antenna installed at the upper left of the window when viewed from the passenger compartment.
- the third loop antenna which has a directivity in a direction away from the direction parallel to the longitudinal direction of the vehicle, is installed in the lower left of the window as viewed from the passenger compartment. It consists of an antenna and a fourth loop antenna installed in the lower right of the window. The offset between the two feed terminals provided in the third loop antenna and the two feed terminals provided in the fourth loop antenna. It is characterized by different directions.
- a loop antenna having directivity in a direction parallel to the front-rear direction of the vehicle has a first loop antenna installed at the lower left of the window as viewed from the passenger compartment, and the lower right of the window.
- the second loop antenna installed at the top of the window with a directivity in a direction deviating from the direction parallel to the front-rear direction of the vehicle is installed at the upper left of the window as viewed from the passenger compartment.
- 3 loop antennas and a fourth loop antenna installed at the upper right of the window. The offset between the two feed terminals provided in the third loop antenna and the two feed terminals provided in the fourth loop antenna. It is characterized by different directions.
- a loop antenna having directivity in a direction parallel to the longitudinal direction of the vehicle is installed in either the upper left or upper right of the window when viewed from the passenger compartment. It consists of an antenna, in front of the vehicle A loop antenna having directivity in a direction deviating from a direction parallel to the rearward direction is a second loop antenna and a third loop installed in the direction along the upper edge of the window as viewed from the passenger compartment. It consists of an antenna and a fourth loop antenna installed at either the lower left or the lower right of the window. Two feed terminals provided in the second loop antenna and two feed terminals provided in the third loop antenna It is characterized by the difference in the offset direction.
- the directivity of the plurality of loop antennas installed in the front glass of the vehicle is not only in the front-rear direction of the vehicle but also in the left-right direction of the vehicle. Even if the direction of travel changes, DTV radio waves can be received well, and the antenna reception performance improves.
- FIG. 1A is a perspective view of a windshield of an automobile to which a vehicle antenna device according to a first embodiment of the present invention is attached and its surroundings as seen from the vehicle interior side.
- FIG. 1B is an enlarged plan view showing one of the loop antennas constituting the vehicular antenna device shown in A.
- FIG. 1B is an enlarged plan view showing one of the loop antennas constituting the vehicular antenna device shown in A.
- FIG. 1C is an enlarged plan view showing another one of the loop antennas constituting the vehicular antenna device shown in FIG. 1A.
- FIG. 1D is an enlarged plan view showing another one of the loop antennas constituting the vehicle antenna device shown in FIG. 1A.
- FIG. 1E is an enlarged plan view showing a loop antenna of a modification of the loop antenna shown in FIG. 1C.
- Fig. 2A is a perspective view showing the appearance of the connector and coaxial cable connected to the feed terminal of the loop antenna shown in Fig. 1A to IE.
- FIG. 2B is an exploded perspective view of the connector shown in FIG. 2A.
- FIG. 3A is a view of the circuit board shown in FIG. 2B as viewed from the back side.
- FIG. 3B is a block circuit diagram showing the internal configuration of the amplifier mounted on the circuit board shown in FIG. 3A.
- Fig. 3C shows another example of the circuit board shown in Fig. 2B as seen from the back side.
- FIG. 4A is a plan view showing a configuration of a double loop antenna that can be used in place of the loop antenna shown in FIG. 2B.
- FIG. 4B is a perspective view showing the configuration of the connector connected to the feed terminal of the loop antenna shown in FIG. 4A.
- FIG. 5 is a circuit diagram showing the connection between the vehicle antenna device of the first embodiment of the present invention and the navigation device mounted on the vehicle.
- FIG. 6A is an explanatory diagram showing the directivity when the film antenna shown in FIG. 1D is installed in the vicinity of the dielectric.
- FIG. 6B is an explanatory diagram showing the directivity when the film antenna shown in FIG. 1A is installed in the vicinity of the dielectric.
- FIG. 6C is an explanatory diagram showing the directivity when the film antenna shown in FIG. 1D is installed in the vicinity of the dielectric.
- FIG. 6D is an explanatory diagram showing the directivity in the vertical direction when the film antenna shown in FIGS. 6A to 6C is installed on the top of the windshield of an automobile.
- FIG. 7A is a perspective view of a windshield of an automobile to which a vehicle antenna device according to a second embodiment of the present invention is attached and its surroundings as seen from the vehicle interior side.
- FIG. 7B is a perspective view of only the windshield of the automobile showing the configuration of the modified example of the vehicle antenna device shown in FIG. 7A as seen from the vehicle interior side.
- FIG. 7C is the vehicle antenna shown in FIG. 7B. It is a top view which expands and shows one of the loop antennas which comprise an apparatus.
- FIG. 7D is an enlarged plan view showing another one of the loop antennas constituting the vehicular antenna device shown in FIG. 7A.
- FIG. 8 is an explanatory view showing the directivity in the vertical direction by the film antenna installed in the lower part of the front glass of the automobile of the vehicle antenna device of the second embodiment of the present invention.
- FIG. 9A is a perspective view of only the windshield of the automobile to which the vehicle antenna device of the third embodiment of the present invention is attached as viewed from the vehicle interior side.
- FIG. 9B is a perspective view of only the windshield of the automobile showing the configuration of the modified example of the vehicle antenna device shown in FIG. 9A, as viewed from the vehicle interior side.
- FIG. 9C is the fourth embodiment of the present invention.
- FIG. 2 is a perspective view of only the windshield of an automobile to which a vehicle antenna device is attached as viewed from the vehicle interior side.
- FIG. 9D is a perspective view of only the windshield of the automobile to which the vehicle antenna device of the fifth embodiment of the present invention is attached as viewed from the vehicle interior side.
- FIG. 1 O A is a plan view of the automobile showing the directivity of the four antennas on the windshield of the automobile to which the vehicle antenna device of the first embodiment of the present invention shown in FIG. 1A is attached.
- FIG. 10B shows four keys on the windshield of the automobile to which the vehicle antenna device of the second embodiment of the present invention shown in FIG. 6A is attached. It is a top view of the motor vehicle which shows the directivity of an antenna.
- FIG. 10C is a plan view of the automobile showing the directivity of the four antennas on the windshield of the automobile to which the vehicle antenna device of the third embodiment of the present invention shown in FIG. 7A is attached.
- FIG. 10D is a plan view of the automobile showing the directivity of the four antennas on the windshield of the automobile to which the vehicle antenna device of the fourth embodiment of the present invention shown in FIG. 7C is attached.
- FIG. 10E is a plan view of the automobile showing the directivity of the four antennas on the windshield of the automobile to which the vehicle antenna device of the fifth embodiment of the present invention shown in FIG. 7D is attached.
- FIG. 1A shows the configuration of a vehicular antenna device 50 according to a first embodiment of the present invention attached to the left and right upper parts of a windshield 1 of an automobile. The surroundings are viewed from inside the vehicle.
- the antenna device 50 according to this embodiment is for receiving D TV transmission, and includes four film antennas 1 O A, 1 0 B, 1 0 C, and 1 0 D. Each of the four film antennas 1 O A, 10 B, 10 C, and 10 D is connected to a feeding circuit including a connector 20 and a coaxial cable 22.
- the signals received by the film antennas 1 OA, 1 0 B, 1 0 C, and 1 0 D are input to the feeder circuit having the coaxial cable 2 2 through the connectors 20, respectively.
- This coaxial cable 22 is arranged along the A-pillar 3 of the automobile, and is not shown in the figure.
- Connected to. 8 is a car navigation device installed on the instrument panel 9 of the car, and receives image signals from the tuner.
- FIG 1B shows an enlarged view of the film antenna 1 OA attached to the upper left side of the front glass 1 of the automobile shown in Figure 1A and the film antenna 10 D attached to the upper right side. is there.
- a loop antenna having a rectangular antenna conductor 23 is used for the film antennas 1 O A and 1 0 D.
- the loop antenna feeds power to the rectangular antenna conductor 2 3, which is formed of a conductive ink or conductor such as copper foil on a single transparent film 24, and the antenna conductor 2 3.
- Power supply terminals 1 1 and 1 2 are provided.
- the feeding terminals 1 1 and 12 are provided close to the symmetrical positions with respect to the center line that bisects the film antennas 10 A and 10 D. Yes.
- Fig. 1C is an enlarged view of the film antenna 10 B installed adjacent to the right side of the film antenna 1 OA mounted on the upper left side of the front glass 1 of the automobile shown in Fig. 1A. It is.
- a loop antenna having a rectangular antenna conductor 2 3 is used for the film antenna 1 0 B.
- the loop antenna includes a rectangular antenna conductor 2 3 formed on a sheet-like transparent film 24 and feed terminals 11 and 12 for feeding power to the antenna conductor 23.
- the feed terminals 1 1 and 1 2 are offset to the left with respect to the center line that bisects the film antenna 10 B to the left and right, and are provided close to the left end. Yes.
- Fig. 1D is an enlarged view of the film antenna 10 C installed adjacent to the left side of the film antenna 10 D attached to the upper right side of the front glass 1 of the automobile shown in Fig. 1 A. It is.
- Phi A loop antenna having a rectangular antenna conductor 23 is used for the room antenna 10C.
- the loop antenna includes a rectangular antenna conductor 2 3 formed on a sheet-like transparent film 24 and power supply terminals 1 1 and 1 2 for supplying power to the antenna conductor 2 3.
- the feeding terminals 1 1 and 1 2 are offset to the right with respect to the center line that bisects the film antenna 10 B to the left and right, and are provided close to the right end. Yes.
- FIG. 1E shows a configuration of a film antenna 10 B M in which a modification of the film antenna 10 B is shown in FIG. 1C.
- the antenna conductor 2 3 S in the short direction adjacent to the feeding terminal 1 1 of the film antenna 10 0 B and the antenna conductor 2 3 L in the longitudinal direction adjacent to the feeding terminal 1 2 are Each consists of two conductor wires. This is to achieve impedance matching.
- FIG. 2A and 2B show the appearance of the connector 20 shown in FIG. 1A and a state where the connector 20 is disassembled.
- the connector 20 is composed of an inner case 2 1 and a fan case 25.
- the surface of the inner case 21 is fixed on the power supply terminals 1 1 and 1 2 of the antennas 1 OA, 1 0 B, 1 0 C, and 1 0 D by an adhesive such as double-sided tape. Is done.
- FIG. 3A shows the general configuration of the circuit board 30 inside the connector 20 shown in FIG. 2B, except for the inner case 21 and the outer case 25.
- FIG. The connection terminals 3 1 and 3 2 are attached to the back side of the circuit board 30, and are led to the front side of the circuit board 30 through the through holes 3 3 and 3 4.
- the through hole 3 3 is connected to the input terminal of the integrated circuit 40 mounted on the front side of the circuit board 30, and the through hole 3 4 is the ground wire (outer conductor) of the coaxial cable 2 2.
- the integrated circuit 40 performs processing such as amplification on the signal received by the antenna, and the processed signal is output to the center conductor (inner conductor) 2 2 A of the coaxial cable 22.
- FIG. 3B shows the internal configuration of the integrated circuit 40 shown in FIG. 3A.
- the integrated circuit 40 there is a filter 4 1 connected to the antenna 10 1, an amplifier 4 2 that amplifies the signal output from the filter 4 1, and a filter 4 that determines the signal band output from the amplifier 4 2.
- This filter 4 3 is connected to the central conductor 2 2 A of the coaxial cable 2 2 through a capacitor 4 4 that blocks direct current.
- the coaxial cable 2 2 is a power supply superimposed cable, and the superimposed power supply voltage (DC) is supplied to the amplifier 4 2 through a coil 45 that cuts off the AC component.
- DC superimposed power supply voltage
- FIG. 3C shows the configuration of the circuit board 30 different from the connector 20 shown in FIG. 3A, except for the inner case 21 and the case 25.
- the connection terminal 3 1 is a terminal on the hot side (signal transmission side), and is connected to the input terminal of the integrated circuit 40 through the through hole 3 3.
- the connection terminal 3 2 is a ground side terminal, and is connected to the ground wire 2 2 B of the coaxial cable 2 2 through the through hole 3 4.
- the circuit board 30 of the connector 20 shown in Fig. 3C has the connection terminal 3 1 as the ground side terminal, and the connection terminal 3 2 Is the terminal on the hot side (signal transmission side).
- connection terminal 3 1 is connected to the ground wire 2 2 B of the coaxial cable 2 2 through a sulfoll 3 4, and the connection terminal 3 2 is connected to the input terminal of the integrated circuit 40 through the through hole 3 3.
- the connection terminal 3 1 can be a ground terminal
- the connection terminal 3 2 can be a hot terminal.
- FIG. 4A is a plan view showing a configuration of a film antenna 10 AM provided with a double loop antenna that can be used instead of the film antenna 1 O A shown in FIG. 1B.
- the film antenna 10 AM is an integrated antenna, and is configured to include the antenna 13 for GPS inside the antenna conductor 23 of the loop antenna for DTV. This is because the GPS antenna 13 has a reception frequency higher than the frequency of DTV broadcasting, so the size of the antenna conductor 15 of the loop antenna is smaller than the size of the antenna conductor 23 of the film antenna 10 AM. It is because it can be made.
- the GPS antenna 13 is composed of a rectangular antenna conductor 15 and a parasitic element 16 provided adjacent to the antenna conductor 15.
- the antenna conductor 15 and the parasitic terminal 16 are also formed on the sheet-like transparent film 24 by a conductive ink or a conductor such as copper foil.
- the two feeding terminals of the GPS antenna 13 of this embodiment are arranged in the vicinity of the two feeding terminals 1 1 and 1 2 of the DTV film antenna 10 AM. Is the film antenna 1 0 AM hot-side power supply terminal 1 1 and ground-side power supply terminal 1 2 are independent forces S, and the ground-side power supply terminal is the film antenna 1 OAM ground-side power supply terminal 1 Same as 1.
- connection terminals 1 there are three connection terminals 1 as shown in Fig. 4B for the feeding terminals 1 1 and 1 4 of the GPS film antenna 1 3 and the film antenna 10 1 for the DTV 10 1 and 1 2.
- 7 1 8, 1 9 One connector 2 7 can be connected.
- Connector 27 connection terminals 1 7, 1 8 and 1 9 are connected to feed terminals 1 4 1 2 1 1 respectively.
- the connector 27 is connected to the coaxial cable 28 for extracting the reception signal of the radio wave emitted from the GPS and the coaxial cable 29 for extracting the reception signal of the DTV broadcast.
- the connection terminals 17, 18, 19 have panel characteristics, and double-sided adhesive tape is affixed around the connection terminals 17, 18, 19 of the connector 27.
- the release paper of the double-sided adhesive tape is peeled off and the connection terminals 1 7, 18, 19 are connected to the power supply terminals 14, 1 Install it at the position of the two-dot chain line shown in Fig. 4A so that it overlaps 2, 1 1.
- a mark or the like is applied to the position where the connector 27 is attached on the transparent film 24.
- FIG. 5 is a circuit diagram showing the connection between the vehicle antenna device 50 of the first embodiment and the navigation device 8 mounted on the vehicle.
- the antenna device 50 of this embodiment includes the film antenna 10 AM shown in FIG. 4A and the film antennas 10 D, 10 B, and 10 C shown in FIGS. 1B, 1 C, and ID. It shall be used.
- the TV tuner 5 is built in the navigation device 8, but the TV tuner 5 may be separated from the navigation device 8.
- the antenna conductor 2 3 in the film antenna 10 AM and the film antennas 10 B, 10 C, and 10 D are antennas that receive terrestrial digital TV radio waves, and the film antenna 1
- the antenna conductor 15 in 0 AM is an antenna for GPS.
- the DTV signals received by these film antennas 10 AM, 10 B, IOC, and 10 D are connected to the cable 2 2 through the integrated circuit 40 that performs amplification and the like built in the connector. Led to TV tuner 5 and The adjusted image is displayed on the display 6 when the navigation device 8 is in the TV mode.
- the GPS signal received by the GPS antenna 13 (antenna conductor 15) mounted on the film antenna 10 AM is sent to the ECU of the navigation device 8 via the integrated circuit 40 and the cable 22.
- the current position of the car is detected by being guided to 4 and displayed on the display 6 of the navigation device 8 together with the map information.
- FIG. 6A shows the directivity when the film antenna 10 C shown in FIG. 1D is installed in the vicinity of the dielectric 7.
- the dielectric 7 becomes the roof portion 2 of the automobile.
- the feed terminals 1 1 and 1 2 are offset to the right with respect to the center line that bisects the left and right, and the feed terminals 1 1 and 1 2 are provided on the right side of the film antenna 10 C. Therefore, the directivity is directed to the left side L with respect to the traveling direction F of the vehicle. Note that the directivity indicated by the broken line in FIG. 6A indicates that the directivity is approximately in this direction, and is not an accurate directivity diagram.
- FIG. 6B shows the directivity when the film antenna 10 A shown in FIG. 1A is installed in the vicinity of the dielectric.
- the film antenna 1 OA is installed on the top of the windshield of the car, this figure is the car seen from above, and the dielectric 7 is the roof part 2 of the car. Since the film antenna 1 OA is provided with feed terminals 11 and 12 at positions symmetrical with respect to the center line that bisects the film antenna 1 OA to the left and right, its directivity is directed in the traveling direction F of the vehicle. The directivity indicated by the broken line indicates that the directivity is approximately in this direction. It is not an accurate directivity diagram.
- FIG. 6C shows the directivity when the film antenna 10 B shown in FIG. 1A is installed in the vicinity of the dielectric.
- the film antenna 10 B is installed on the upper part of the windshield of the automobile, this figure is that the automobile is viewed from above, and the dielectric 7 is the roof portion 2 of the automobile.
- the feed terminals 11 and 12 are offset to the left with respect to the center line that bisects the left and right, and the feed terminals 1 1 and 12 are provided on the right side of the film antenna 10 B. Therefore, its directivity turns to the right R with respect to the traveling direction F of the vehicle.
- Fig. 6D shows the film antenna shown in Fig. 6A to Fig. 6C in the vertical direction when 10 C, 1 OA, 1 OB is installed in the vicinity of the roof portion 2 on the upper windshield 1 of the automobile 60 It shows directivity.
- the directivity indicated by the broken line indicates that the directivity is approximately in this direction, and is not an accurate directivity diagram. Since the film antennas 10 C, 10 A and 10 B are for DTV, the vertical directivity of these antennas is obliquely upward with respect to the traveling direction F of the vehicle.
- the directivity of the antenna device 50 in which the film antennas 1 OA, 10 B, 10 C, and 10 D are arranged on the windshield 1 of the automobile 60 is the same as that of the automobile 60.
- the range in which D TV broadcasting can be received extends in the left direction L and the right direction R with respect to the vehicle traveling direction F.
- FIG. 7A is a view of the windshield 1 of the automobile on which the vehicle antenna device 50 according to the second embodiment of the present invention is mounted and its surroundings as viewed from the vehicle interior side. It is a thing.
- the antenna device 5 0 of this embodiment is also for receiving radio waves radiated from the DTV, and is composed of four film antennas 1 OA, 1 0 B, 1 0 C, and 1 0 D .
- Each of the four film antennas 1 OA, 10 B, 10 C, and 10 D is connected to a feeder circuit comprising a connector 20 and a coaxial cable 22, but the connector 20 and the coaxial cable 2 2 Is omitted in this embodiment.
- the processing of the signals received by the film antennas 1 OA, 1 0 B, 1 0 C, and 1 0 D is the same as that of the first embodiment, and the description thereof is omitted here.
- the arrangement of the film antennas 1 O A and 1 0 D is the same as in the first embodiment.
- the film antennas 10 B and 10 C are provided not in the upper part of the front glass 1 of the automobile but in the vicinity of the left and right A-villars 3 in the lower part of the front glass 1.
- the film antenna 10 B is rotated 90 degrees to the left from the mounting state of the first embodiment so that the longitudinal direction of the antenna element is along the A-bill 1-3. It is attached to the lower left side.
- the film antenna 10 C is rotated by 90 degrees to the right from the mounting state of the first embodiment so that the longitudinal direction of the antenna element is along the A-biller 1 3. It is attached to the lower left part of 1.
- the antenna device 50 in the vertical direction when the automobile 60 is viewed from the side due to the directivity of the film antennas IOC and 10 B described with reference to FIGS. 6A and 6C.
- the directivity of is close to the vertical direction.
- the directivity shown by the broken line is almost in this direction. This is not an accurate directivity diagram.
- FIG. 7B is a view of only the windshield 1 of the automobile showing the configuration of the modified example of the vehicle antenna device 50 shown in FIG. 7A, as viewed from the vehicle interior side.
- film antennas 10 E and 1 OF including a parasitic element 16 are used instead of the film antennas 10 C and 10 B described in FIG. 7A.
- the film antennas 10 E and 10 F have the structure shown in FIGS. 7C and 7D.
- the parasitic element 16 is composed of a portion 16 A parallel to the shorter (shorter) side of the antenna conductor 23 and a portion 16 B on the longer (longer) extension line. By adding the parasitic element 16, the directivity becomes sharper and the antenna sensitivity is improved.
- the directivity of the antenna device 5 0 in which the film antennas 1 OA, 1 0 D, 1 0 E, 1 0 F are arranged on the windshield 1 of the automobile 60 is
- FIG. 10B the range in which DTV broadcasting can be received spreads behind the vehicle in the traveling direction F of the vehicle as indicated by the broken line.
- radio waves of the DTV broadcast from the rear of the vehicle can be received well, and the reception performance of the antenna device 50 is improved.
- the directivity diagram indicated by a broken line in FIG. 10B is not an actual directivity diagram, but an image of the effect of the present invention.
- FIG. 9A is a view of only the windshield 1 of the automobile to which the vehicle antenna device 50 of the third embodiment of the present invention is attached as viewed from the vehicle interior side.
- the antenna device 50 of this embodiment is also shown in FIG. It is for receiving DTV broadcasts.
- the antenna device 5 includes two film antennas 1 0 ⁇ 1 0 B and two film antennas 1 0 C. 0 is configured.
- the illustration of the connector 20 and the coaxial cable 22 is also omitted in this embodiment. Further, since the processing of the signals received by the film antennas 10 B and 10 C is the same as that in the first embodiment, the description thereof is omitted here.
- the arrangement of the film antennas 10 B and 10 C installed on the top of the windshield 1 of the automobile is the same as that of the first embodiment.
- the arrangement of the film antennas 10 B and 10 C installed in the vicinity of the left and right A-bills 13 below the windshield 1 is the same as in the second embodiment. Therefore, in the antenna device 50 of the third embodiment, the directivity of the antenna device 50 when the automobile 60 is viewed from above is as shown in FIG. 10C. Note that the directivity diagram indicated by a broken line in FIG. 10C is not an actual directivity diagram, but an image of the effect of the present invention.
- FIG. 9B shows only the windshield 1 of the automobile showing the configuration of the modified example of the vehicular antenna apparatus 50 of the third embodiment shown in FIG. 9A, as viewed from the vehicle interior side.
- This modification differs from the third embodiment in that a parasitic element 16 is provided instead of the film antennas 10 B and 10 C provided near the left and right A pillars 3 below the front glass 1.
- the parasitic element 16 is disposed adjacent to the antenna conductor 23.
- FIG. 9C is a view of only the windshield 1 of the automobile to which the vehicle antenna device 50 of the fourth embodiment of the present invention is attached as viewed from the vehicle interior side.
- the vehicle in the left half is viewed from the passenger compartment side.
- the arrangement of the film antennas 1 OA and 1 OB is the same as in the first embodiment, and the arrangement of the two film antennas 10 C in the right half is the same as in the second embodiment.
- the directivity of the antenna device 50 when the automobile 60 is viewed from above is as shown in FIG.
- the directivity diagram indicated by a broken line in FIG. 10D is not an actual directivity diagram but an image of the effect of the present invention.
- FIG. 9D is a view of only the front glass 1 of the automobile on which the vehicle antenna device 50 of the fifth embodiment of the present invention is mounted, as viewed from the vehicle interior side.
- the arrangement of the film antennas IOC, 10 D in the right half is the same as in the first embodiment, and the two film antennas 1 in the left half 1
- the arrangement of 0 B is the same as in the second embodiment. Therefore, in the antenna device 50 of the fifth embodiment, the directivity of the antenna device 50 when the automobile 60 is viewed from above is as shown in FIG. Note that the directivity diagram indicated by a broken line in FIG. 10E is not an actual directivity diagram, but an image of the effect of the present invention.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/738,583 US20100289710A1 (en) | 2007-10-18 | 2008-11-11 | Vehicle antenna system |
CN200880104276.7A CN101785142B (zh) | 2007-11-12 | 2008-11-11 | 车辆用天线装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-293290 | 2007-11-12 | ||
JP2007293290A JP5269393B2 (ja) | 2007-11-12 | 2007-11-12 | 車両用アンテナ装置 |
Publications (1)
Publication Number | Publication Date |
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WO2009064003A1 true WO2009064003A1 (ja) | 2009-05-22 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2008/070835 WO2009064003A1 (ja) | 2007-10-18 | 2008-11-11 | 車両用アンテナ装置 |
Country Status (4)
Country | Link |
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JP (1) | JP5269393B2 (ja) |
CN (1) | CN101785142B (ja) |
TW (1) | TWI518986B (ja) |
WO (1) | WO2009064003A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3029769A4 (en) * | 2013-07-31 | 2017-03-01 | Asahi Glass Company, Limited | Antenna device |
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JPH07106828A (ja) * | 1993-10-01 | 1995-04-21 | Toyota Motor Corp | 自動車電話用ガラスアンテナ |
JP2004193680A (ja) * | 2002-12-06 | 2004-07-08 | Fujitsu Ten Ltd | 車載用アンテナおよびダイバシティ受信装置 |
JP2007174614A (ja) * | 2005-11-28 | 2007-07-05 | Fujitsu Ten Ltd | ループアンテナ、ループアンテナの車両への取付方法、及びループアンテナを備える車両のリヤガラス |
US20070247379A1 (en) * | 2006-04-19 | 2007-10-25 | Asahi Glass Company Limited | High frequency wave glass antenna for an automobile and rear window glass sheet for an automobile |
Family Cites Families (1)
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JP5153300B2 (ja) * | 2007-11-07 | 2013-02-27 | 富士通テン株式会社 | アンテナ |
-
2007
- 2007-11-12 JP JP2007293290A patent/JP5269393B2/ja not_active Expired - Fee Related
-
2008
- 2008-11-11 WO PCT/JP2008/070835 patent/WO2009064003A1/ja active Application Filing
- 2008-11-11 CN CN200880104276.7A patent/CN101785142B/zh not_active Expired - Fee Related
- 2008-11-12 TW TW097143725A patent/TWI518986B/zh not_active IP Right Cessation
Patent Citations (4)
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JPH07106828A (ja) * | 1993-10-01 | 1995-04-21 | Toyota Motor Corp | 自動車電話用ガラスアンテナ |
JP2004193680A (ja) * | 2002-12-06 | 2004-07-08 | Fujitsu Ten Ltd | 車載用アンテナおよびダイバシティ受信装置 |
JP2007174614A (ja) * | 2005-11-28 | 2007-07-05 | Fujitsu Ten Ltd | ループアンテナ、ループアンテナの車両への取付方法、及びループアンテナを備える車両のリヤガラス |
US20070247379A1 (en) * | 2006-04-19 | 2007-10-25 | Asahi Glass Company Limited | High frequency wave glass antenna for an automobile and rear window glass sheet for an automobile |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3029769A4 (en) * | 2013-07-31 | 2017-03-01 | Asahi Glass Company, Limited | Antenna device |
Also Published As
Publication number | Publication date |
---|---|
JP2009124242A (ja) | 2009-06-04 |
TWI518986B (zh) | 2016-01-21 |
JP5269393B2 (ja) | 2013-08-21 |
TW200939559A (en) | 2009-09-16 |
CN101785142A (zh) | 2010-07-21 |
CN101785142B (zh) | 2013-08-07 |
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