TWI518986B - Vehicle antenna device - Google Patents

Description

Vehicle antenna device

The present invention relates to an antenna device for a vehicle. In particular, the present invention relates to a vehicle antenna device including a plurality of loop antennas that are attached to a portion around a windshield of a vehicle.

In the past, an antenna such as a reception of radio waves can be applied to a vehicle such as an automobile. The radio waves received by the vehicles have been dominated by ultra-short waves (VHF) or ultra-short waves (UHF) for mid-wave (MW) and FM radio or television for AM radio. On the other hand, in recent years, an antenna for a GPS (Global Positioning System) or an antenna for transmitting and receiving a high-frequency wave such as an antenna for receiving a ground wave digital broadcast is gradually mounted on a vehicle. Hereinafter, the received ground wave digital television is referred to as DTV.

The antenna is installed at the place where the antenna of the mobile body is mounted, and is generally a windshield of the vehicle. When the antenna is mounted on the windshield, it is disposed on the upper portion of the windshield, and the antenna is formed on the transparent film and the windshield is attached with an adhesive material (for example, refer to Japanese Patent Laid-Open No. 2006-270602). In such a film type antenna, there are many loop antennas that form a horizontal length.

However, the conventional loop antenna attached to the upper portion of the windshield for receiving the DTV broadcast has a problem that the directivity of the loop antenna is in front of the vehicle, and it becomes difficult to receive the signal when the vehicle changes the traveling direction. In order to eliminate this problem, there is also a diversity antenna device in which a glass for DTV is also provided in the glass after the vehicle, and a radio wave having a good sensitivity is selectively received. However, this diversity antenna device requires an antenna switching circuit and a composite circuit for receiving radio waves, etc., so that the setting is difficult and the installation cost is high.

Therefore, the object of the present invention is to provide a minimum number of loop antennas for changing the directivity of the windshield of the vehicle, thereby improving the receiving directivity of the DTV broadcast regardless of the direction of travel of the vehicle. A vehicle antenna device that can receive DTV broadcasts satisfactorily and can be installed at an affordable price.

The vehicular antenna device of the present invention which achieves the above object is characterized in that it comprises a loop antenna which is directional in a direction parallel to a front and rear direction of the vehicle, and a loop antenna which is oriented in a direction parallel to the front and rear of the vehicle The direction of the vehicle is directional; and is provided in a vehicle antenna device provided in a fixed window of the vehicle; a loop antenna having directivity in a direction parallel to the front and rear directions of the vehicle, and two power supply terminals are divided into two parts with respect to the loop antenna The center line is arranged symmetrically; the loop antenna having directivity in a direction deviating from the front and rear directions of the vehicle is configured such that the two power supply terminals are arranged to be offset to either side with respect to dividing the loop antenna into left and right center lines . In such a vehicle antenna device, the following four types are available.

The first type is characterized in that the loop antenna having directivity in a direction parallel to the front and rear directions of the vehicle is a first loop antenna disposed on the upper left side of the window when viewed from the interior of the vehicle, and is disposed on the upper right side of the window. a loop antenna having a directivity in a direction deviating from a front-rear direction parallel to the vehicle, and a third loop antenna provided adjacent to a right side of the first loop antenna when viewed from a vehicle interior, and It is configured by a fourth loop antenna provided adjacent to the left side of the second loop antenna.

The second type is characterized in that the loop antenna having directivity in a direction parallel to the front and rear directions of the vehicle is a first loop antenna disposed on the upper left side of the window when viewed from the interior of the vehicle, and is disposed on the upper right side of the window. The second loop antenna is configured; the loop antenna having directivity in a direction deviating from the front and rear directions of the vehicle is a third loop antenna disposed at the lower left of the window when viewed from the interior of the vehicle, and is disposed at the lower right of the window. The fourth loop antenna is configured; the second loop antenna has two power supply terminals, and the direction of the offset from the two power supply terminals of the fourth loop antenna is different.

The third type is characterized in that a loop antenna having directivity in a direction parallel to the front and rear directions of the vehicle is provided by the first loop antenna disposed at the lower left of the window and at the lower right of the window when viewed from the interior of the vehicle. The second loop antenna is configured; the loop antenna having directivity in a direction deviating from the front and rear directions of the vehicle is a third loop antenna disposed on the upper left side of the window when viewed from the interior of the vehicle, and is disposed on the upper right side of the window. The fourth loop antenna is configured; the second loop antenna has two power supply terminals, and the direction of the offset from the two power supply terminals of the fourth loop antenna is different.

Further, the fourth type is characterized in that the loop antenna having directivity in a direction parallel to the front and rear directions of the vehicle includes a first loop antenna provided on one of the upper left and upper right sides of the window when viewed from the inside of the vehicle; The loop antenna having directivity in a direction parallel to the front-rear direction of the vehicle includes a second loop antenna and a third loop antenna disposed in a direction along the upper edge of the window when viewed from the interior of the vehicle, and is disposed at the window The fourth loop antenna of either of the lower left and the lower right is different from the two power supply terminals of the second loop antenna and the direction of the offset between the two power supply terminals of the third loop antenna.

According to the antenna device for a vehicle of the present invention, the directivity of the plurality of loop antennas provided in the windshield of the vehicle is not only in the front-rear direction of the vehicle but also in the left-right direction of the vehicle, so that the vehicle can be improved even if the traveling direction of the vehicle is changed. Receive radio waves for DTV to improve the receiving performance of the antenna.

Hereinafter, an embodiment of the vehicle antenna device of the present invention will be described in detail based on a specific embodiment of a windshield provided in an automobile with reference to the drawings.

Fig. 1A is a view showing a configuration of a vehicle antenna device 50 according to a first embodiment of the present invention attached to the left and right upper portions of the windshield 1 of an automobile, and the windshield 1 of the automobile and its surroundings are seen from the inside of the vehicle interior. The vehicle antenna device 50 of the present embodiment is for receiving DTV broadcast, and is composed of four film-type antennas 10A, 10B, 10C, and 10D. A power supply circuit including a connector 20 and a coaxial cable 22 is connected to each of the four film-type antennas 10A, 10B, 10C, and 10D.

The signals received by the film-type antennas 10A, 10B, 10C, and 10D are input to the power supply circuit including the coaxial cable 22 via the connector 20. The coaxial cable 22 is disposed along the A-pillar of the automobile and is connected to a digital TV tuner (not shown). 8 is a car satellite navigation device provided on the dashboard 9 of the automobile, and an image signal from the tuner is input.

Fig. 1B is an enlarged view of the film-type antenna 10A attached to the upper left side of the windshield 1 of the automobile shown in Fig. 1A and the film-type antenna 10D attached to the upper right side. In the film-type antennas 10A and 10D, a loop antenna having a rectangular antenna conductor 23 is used. The loop antenna includes a rectangular antenna conductor 23 formed of a conductor such as a conductive ink or a copper foil on a sheet-like transparent film 24, and power supply terminals 11 and 12 for supplying power to the antenna conductor 23. In the film-type antennas 10A and 10D, the power supply terminals 11 and 12 are divided into left and right center lines with respect to the film-type antennas 10A and 10D, and are disposed close to each other at a symmetrical position.

Fig. 1C is an enlarged view of the film-type antenna 10B disposed adjacent to the right side of the film-type antenna 10A attached to the upper left side of the windshield 1 of the automobile shown in Fig. 1A. In the film-type antenna 10B, a loop antenna having a rectangular shape in which the antenna conductor 23 is used is used. The loop antenna includes a rectangular antenna conductor 23 formed on the sheet-like transparent film 24, and power supply terminals 11, 12 for supplying power to the antenna conductor 23. In the film-type antenna 10B, the power supply terminals 11 and 12 are shifted to the left side with respect to the center line of the left and right sides of the film-type antenna 10B, and are disposed close to the left end portion.

Fig. 1D is an enlarged view of the film-type antenna 10C disposed on the left side of the film-type antenna 10D attached to the upper right side of the windshield 1 of the automobile shown in Fig. 1A. In the film-type antenna 10C, a loop antenna having a rectangular shape in which the antenna conductor 23 is used is used. The loop antenna includes a rectangular antenna conductor 23 formed on the sheet-like transparent film 24, and power supply terminals 11, 12 for supplying power to the antenna conductor 23. In the film-type antenna 10C, the power supply terminals 11 and 12 are shifted to the right side with respect to the center line of the left and right sides of the film-type antenna 10B, and are disposed close to the right end portion.

Fig. 1E is a view showing a configuration of a film type antenna 10BM constituting a modification of the film type antenna 10B shown in Fig. 1C. In the film-type antenna 10BM, the antenna conductor 23S in the short-side direction of the power-supply terminal 11 adjacent to the film-type antenna 10B and the antenna conductor 23L in the longitudinal direction adjacent to the power-supply terminal 12 are formed by two conductor lines. This is to obtain a matching impedance.

2A and 2B are views showing the appearance of the connector 20 shown in Fig. 1A and the exploded state of the connector 20. As shown in FIG. 2A, the connector 20 is constructed by combining the inner casing 21 and the outer casing 25. On the surface of the inner casing 21 of the connector 20 (the mounting surface to the antenna 10), there are two openings 21A and 21B, and the elastic connecting terminals 31 and 32 protrude from the openings 21A and 21B. The connector 20 fixes the surface of the inner casing 21 to the power supply terminals 11, 12 of the antennas 10A, 10B, 10C, and 10D, respectively, by an adhesive material such as a double-sided tape.

As shown in FIG. 2B, the connection terminals 31 and 32 are mounted on one surface of a circuit board (dielectric substrate) 30 in which the inner case 21 and the case 25 are housed, and the circuit board 30 is connected to the coaxial cable 22. An integrated circuit 40 to be described later is mounted on the other surface of the circuit board 30. Generally, the connection terminal 31 is a terminal on the hot side (signal transmission side), and the connection terminal 32 is a terminal on the ground side.

Fig. 3A shows a general configuration of the circuit board 30 inside the connector 20 shown in Fig. 2B after the inner casing 21 and the outer casing 25 are removed. The connection terminals 31 and 32 are attached to the back side of the circuit board 30, and are guided to the front side of the circuit board 30 by the through holes 33 and 34. In this example, the through hole 33 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 34 is connected to the ground line (outer conductor) 22B of the coaxial cable 22. The integrated circuit 40 is for processing amplifying the signal received by the antenna, and the processed signal is output to the center conductor (inner conductor) 22A of the coaxial cable 22.

Fig. 3B shows the internal structure of the integrated circuit 40 shown in Fig. 3A. Inside the integrated circuit 40, there are an amplifier 41 connected to the filter 41 of the antenna 10, a signal output from the amplification filter 41, and a filter 43 defining a signal band output from the amplifier 42. This filter 43 is connected to the center conductor 22A of the coaxial cable 22 via a DC blocking capacitor 44. The coaxial cable 22 is a power supply overlapping cable, and the overlapping power supply voltage (DC) is supplied to the amplifier 42 by blocking the coil 45 of the AC component.

Fig. 3C shows the configuration of the circuit board 30 which is different from the connector 20 shown in Fig. 3A after the inner casing 21 and the outer casing 25 are removed. In the circuit board 30 of the connector 20 shown in FIG. 3A, the connection terminal 31 is a terminal on the hot side (signal transmission side), is connected to the input terminal of the integrated circuit 40 by the through hole 33, and the connection terminal 32 is the ground side. The terminal is connected to the ground line 22B of the coaxial cable 22 by the through hole 34. On the other hand, in the circuit board 30 of the connector 20 shown in FIG. 3C, the connection terminal 31 is a terminal on the ground side, and the connection terminal 32 is a terminal on the hot side (signal transmission side). The connection terminal 31 is connected to the ground line 22B of the coaxial cable 22 by the through hole 34, and the connection terminal 32 is connected to the input terminal of the integrated circuit 40 by the through hole 33. In this manner, the terminal 31 can be connected as a terminal on the ground side, and the connection terminal 32 can be used as a terminal on the hot side.

Fig. 4A is a plan view showing a configuration of a film type antenna 10AM having a double loop antenna which can be used in place of the film type antenna 10A shown in Fig. 1B. The film-type antenna 10AM system is combined with an antenna, and an antenna 13 for GPS is provided inside the antenna conductor 23 of the loop antenna for DTV. Since the receiving frequency of the antenna 13 for GPS is higher than the frequency of the DTV broadcast, the size of the antenna conductor 15 of the loop antenna can be smaller than the size of the antenna conductor 23 of the film antenna 10AM. The antenna 13 for GPS is composed of a rectangular antenna conductor 15 and a parasitic element 16 adjacent to the antenna conductor 15. The antenna conductor 15 and the parasitic element 16 are also formed on the sheet-like transparent film 24 by a conductor such as conductive ink or copper foil.

The two power supply terminals of the GPS antenna 13 of the present embodiment are disposed in the vicinity of the two power supply terminals 11 and 12 of the film antenna 10AM for DTV. Therefore, the hot side power supply terminal 14 and the thin side of the film type antenna 10AM are provided. The power supply terminal 12 and the power supply terminal 11 on the ground side are independently provided, but the power supply terminal on the ground side is common to the power supply terminal 11 on the ground side of the film type antenna 10AM.

Therefore, the power supply terminals 11 and 14 of the film-type antenna 13 for GPS and the power supply terminals 11 and 12 of the film-type antenna 10AM for DTV can be connected to one of the three connection terminals 17, 18, and 19 of FIG. 4B. 27. The connection terminals 17, 18, 19 of the connector 27 are connected to the power supply terminals 14, 12, 11, respectively. The connector 27 is connected to a coaxial cable 28 for taking out a reception signal of a radio wave radiated by the GPS described above, and a coaxial cable 29 for taking out a reception signal of a radio wave radiated from the DTV. The connection terminals 17, 18, 19 have elasticity, and a double-sided tape is attached around the connection terminals 17, 18, 19 of the connector 27. Therefore, when the connector 27 is connected to the power supply terminals 14, 12, 11, the release paper of the double-sided tape is peeled off so that the connection terminals 17, 18, 19 are superposed on the power supply terminals 14, 12, 11 and are attached to The position of the two-point chain line as shown in FIG. 4A is sufficient. The attachment position of the connector 27 on the transparent film 24 is actually applied with a mark or the like.

Fig. 5 is a circuit diagram showing the connection between the vehicle antenna device 50 of the first embodiment and the satellite navigation device 8 mounted on the vehicle. In the vehicle antenna device 50 of the present embodiment, the film type antenna 10AM shown in FIG. 4A and the film type antennas 10D 10B and 10C shown in FIGS. 1B, 1C, and 1D are used. again In the present embodiment, although the TV tuner 5 is built in the satellite navigation device 8, the TV tuner 5 may be an individual body with the satellite navigation device 8.

In the present embodiment, the antenna conductor 23 and the film-type antennas 10B, 10C, and 10D in the film-type antenna 10AM are antennas for receiving ground wave digital TV waves, and the antenna conductor 15 of the film-type antenna 10AM is an antenna for GPS. The signals for the DTV received by the film-type antennas 10AM, 10B, 10C, and 10D are guided to the TV tuner 5 by the coaxial cable 22 via the integrated circuit 40 built in the connector and the like. The demodulated image is displayed on its display 6 when the satellite navigation device 8 presents the TV mode. Further, the GPS signal received by the GPS antenna 13 (the antenna conductor 15) mounted on the film antenna 10AM is guided to the ECU (Electronic Control Unit) 4 of the satellite navigation device 8 via the integrated circuit 40 and the cable 22. To detect the current position of the car and display it on the display 6 of the satellite navigation device 8 together with the map information.

Here, the antenna directivity at the time of reception of the DTV broadcast of the vehicle antenna device 50 in which the film-type antennas 10A, 10B, 10C, and 10D are arranged as shown in FIG. 1A will be described. Fig. 6A is an explanatory view showing the directivity in the case where the film-type antenna 10C shown in Fig. 1D is provided in the vicinity of the dielectric 7. This figure is a view seen from above the automobile when, for example, the film type antenna 10C is disposed on the upper portion of the windshield of the automobile. In this case, the dielectric 7 becomes the top 2 of the car. The film-type antenna 10C is biased to the right side with respect to the center line of the two-division, and since the power-supply terminals 11 and 12 are provided in the film-type antenna 10C, the directivity thereof is directed toward the left side of the traveling direction F of the vehicle. . Further, the directivity indicated by a broken line in Fig. 6A indicates that the directivity is approximately in this direction, and is not the correct directivity map.

Fig. 6B is a view showing the directivity of the case where the film-type antenna 10A shown in Fig. 1A is placed in the vicinity of the dielectric. Here, the film type antenna 10A is also placed on the upper part of the windshield of the automobile. This figure shows the figure of the car from above, and the dielectric material 7 becomes the top 2 of the car. The film-type antenna 10A is provided with the power supply terminals 11 and 12 at positions symmetrical with respect to the center line of the two points, so that the directivity is directed toward the traveling direction F of the vehicle. Further, the directivity indicated by the broken line indicates that the directivity is approximately in this direction, and is not the correct directivity map.

Fig. 6C is a view showing the directivity of the case where the film-type antenna 10B shown in Fig. 1A is provided in the vicinity of the dielectric. Here, the film type antenna 10B is also placed on the upper portion of the windshield of the automobile. This figure shows the figure of the car from above, and the dielectric material 7 becomes the top 2 of the car. The film-type antenna 10B is biased to the left side of the center line of the two-division, and the power supply terminals 11 and 12 are disposed on the left side of the film-type antenna 10B, so that the directivity thereof is oriented toward the traveling direction F of the vehicle. Right R.

Fig. 6D is an explanatory view showing the directivity of the film-type antennas 10C, 10A, and 10B shown in Figs. 6A to 6C in the vicinity of the roof 2 of the upper portion of the windshield 1 of the automobile 60. Here, the directivity indicated by the broken line indicates that the directivity is approximately in this direction, and is not the correct directivity map. The film-type antennas 10C, 10A, and 10B are used for DTV, and the directivity of the antennas is directed obliquely upward toward the traveling direction F of the vehicle.

Therefore, as shown in FIG. 1A, in the case where the directivity of the antenna device 50 in which the film-type antennas 10A, 10B, 10C, and 10D are disposed in the windshield 1 of the automobile 60 is viewed from above, the car becomes as shown in FIG. 10A. The range in which the DTV broadcast can be received is expanded in the left direction L and the right direction R of the traveling direction F of the vehicle. As a result, even if the traveling direction of the vehicle is changed, the radio wave of the DTV broadcast can be satisfactorily received, and the receiving performance of the antenna device 50 can be improved.

Fig. 7A is a perspective view of the windshield 1 of the automobile in which the vehicle antenna device 50 according to the second embodiment of the present invention is mounted, and the periphery thereof is seen from the inside of the vehicle interior. The vehicle antenna device 50 of the present embodiment is also configured to receive radio waves radiated by the DTV, and is composed of four thin film antennas 10A, 10B, 10C, and 10D. A power supply circuit composed of the connector 20 and the coaxial cable 22 is connected to each of the four film-type antennas 10A, 10B, 10C, and 10D, but the illustration of the connector 20 and the coaxial cable 2 is omitted in this embodiment. . Further, the processing of the signals received by the film-type antennas 10A, 10B, 10C, and 10D is the same as that of the first embodiment, and thus the description thereof will be omitted.

In the second embodiment, among the four film-type antennas 10A, 10B, 10C, and 10D, the arrangement of the film-type antennas 10A and 10D is the same as that of the first embodiment, but the film-type antennas 10B and 10C are provided in the automobile. The vicinity of the left and right A-pillars 3 of the lower portion of the windshield 1 is not the upper portion of the windshield 1 of the automobile. At this time, the film-type antenna 10B is attached to the left lower portion of the windshield 1 in a state where the longitudinal direction of the antenna is along the A-pillar 3 and is rotated 90 degrees to the left in the mounted state of the first embodiment. In the same manner, the film-type antenna 10C is attached to the right side of the windshield 1 in a state where the longitudinal direction of the antenna is along the A-pillar 3 so as to be rotated 90 degrees to the right in the mounted state of the first embodiment. Lower part.

In the antenna device 50 of the second embodiment, the directivity of the film-type antennas 10C and 10B described with reference to FIGS. 6A and 6C, and the directivity of the antenna device 50 in the vertical direction when the automobile 60 is viewed from the side is as shown in FIG. As shown, it is close to the vertical direction. As a result, it is easy to receive radio waves from the DTV broadcast behind the car 60, and the receiving performance of the antenna device 50 is improved. Further, the directivity indicated by the broken line indicates that the directivity is approximately in this direction, and is not the correct directivity map.

Fig. 7B is a perspective view showing only the windshield 1 of the automobile, which is a modification of the vehicle antenna device 50 shown in Fig. 7A, seen from the inside of the vehicle interior. In the present embodiment, instead of the film-type antennas 10C and 10B shown in FIG. 7A, the film-type antennas 10E and 10F including the parasitic element 16 are used. The film-type antennas 10E and 10F are configured as shown in Figs. 7C and 7D, and the parasitic element 16 is disposed adjacent to the vicinity of the antenna conductor 23 on the side of the power supply terminals 11 and 12 located on the transparent film 24. The parasitic element 16 is composed of a portion 16A parallel to the shorter side (short side) of the antenna conductor 23 and a portion 16B on the extension line of the longer side (long side). By adding the parasitic element 16, the directivity can be sharpened and the antenna sensitivity can be improved.

Therefore, as shown in FIGS. 7A and 7B, in the case where the directivity of the antenna device 50 in which the film-type antennas 10A, 10D, 10E, and 10F are disposed in the windshield 1 of the automobile 60 is viewed from above, the image becomes as shown in FIG. 10B. As shown, the range of receivable DTV broadcasts, as indicated by the dashed lines, expands the direction of travel F of the vehicle toward the rear of the vehicle. As a result, the radio wave from the DTV broadcast of the rear side of the vehicle can be satisfactorily received, and the receiving performance of the antenna device 50 can be improved. Further, the directivity diagram shown by the broken line in Fig. 10B indicates an image of the effect of the present invention instead of the actual directivity map.

Fig. 9A is a view showing the windshield 1 of the automobile in which the vehicle antenna device 50 according to the third embodiment of the present invention is mounted. The antenna device 50 of the present embodiment is also used for receiving radiation from the DTV. Electric wave. In the third embodiment, the antenna device 50 is configured by two thin film antennas 10B and two thin film antennas 10C. In the present embodiment, the illustration of the connector 20 and the coaxial cable 22 is also omitted. Further, the processing of the signals received by the film-type antennas 10B and 10C is also the same as that of the first embodiment, and thus the description thereof will be omitted.

In the third embodiment, the arrangement of the film-type antennas 10B and 10C provided on the upper portion of the windshield 1 of the automobile is the same as that of the first embodiment. Moreover, the arrangement of the film-type antennas 10B and 10C provided in the vicinity of the left and right A-pillars 3 of the lower portion of the windshield 1 is the same as that of the second embodiment. Therefore, in the antenna device 50 of the third embodiment, the directivity of the antenna device 50 in the case where the automobile 60 is viewed from the upper side becomes as shown in Fig. 10C. Further, the directivity diagram shown by the broken line in Fig. 10C indicates an image of the effect of the present invention instead of the actual directivity map.

Fig. 9B is a view showing the windshield 1 of only the automobile, which is a modification of the vehicle antenna device 50 of the third embodiment shown in Fig. 9A, as seen from the inside of the vehicle interior. The present modification is different from the third embodiment in that the film-type antennas 10E and 10C including the parasitic element 10 are used instead of the film-type antennas 10B and 10C provided in the vicinity of the left and right A-pillars 3 provided at the lower portion of the windshield 1. point. The film-type antennas 10E and 10F are generally disposed adjacent to the antenna conductor 23 in the vicinity of the antenna conductor 23 as described in FIGS. 7C and 7D. The parasitic element 16 is composed of a portion 16A parallel to the shorter side of the antenna conductor 23 and a portion 16B on the extension line of the longer side. By adding the parasitic element 16, the directivity can be sharpened and the antenna sensitivity can be improved.

Fig. 9C is a view showing the windshield 1 of the automobile in which the vehicle antenna device 50 according to the fourth embodiment of the present invention is mounted, as seen from the inside of the vehicle interior. In the fourth embodiment, the arrangement of the film-type antennas 10A and 10B located in the left half is the same as that of the first embodiment, and the arrangement of the two film-type antennas 10C located in the right half is the same as that of the third embodiment. The examples are the same. Therefore, in the antenna device 50 of the fourth embodiment, the directivity of the antenna device 50 in the case where the automobile 60 is viewed from the upper side becomes as shown in Fig. 10D. Further, the directivity diagram shown by the broken line in Fig. 10D indicates an image of the effect of the present invention instead of the actual directivity map.

Fig. 9D is a view showing the windshield 1 of only the automobile to which the vehicle antenna device 50 of the fifth embodiment of the present invention is attached, as seen from the inside of the vehicle interior. In the fifth embodiment, the arrangement of the film-type antennas 10C and 10D located in the right half is the same as that of the first embodiment, and the arrangement of the two film-type antennas 10B located in the left half and the third embodiment are shown in the third embodiment. The example is the same. Therefore, in the antenna device 50 of the fifth embodiment, the directivity of the antenna device 50 in the case where the automobile 60 is viewed from the upper side becomes as shown in Fig. 10E. Further, the directivity diagram shown by the broken line in Fig. 10E indicates an image of the effect of the present invention instead of the actual directivity map.

1. . . windshield

2. . . Car top

3. . . A column

4. . . ECU

5. . . TV tuner

6. . . monitor

7. . . Dielectric

8. . . Satellite navigation device

9. . . Dashboard

10. . . antenna

10A, 10AM, 10B, 10BM, 10C, 10D, 10E, 10F. . . Film antenna

11,12,14. . . Power supply terminal

13. . . Antenna for GPS

15,23. . . Antenna conductor

16. . . No power supply component

16A. . . Part of the shorter side (short side)

16B. . . Part of the extension of the longer side (long side)

17,18,19,31,32. . . Connection terminal

20,27. . . Connector

twenty one. . . Inner shell

21A, 21B. . . Opening

22,28,29. . . Coaxial cable

22A. . . Center conductor (inside conductor)

22B. . . Ground wire (outer conductor)

23L. . . Long side antenna conductor

23S. . . Short-side antenna conductor

twenty four. . . Flaky transparent film

25. . . shell

30. . . Circuit substrate (dielectric substrate)

33,34. . . Through hole

40. . . Integrated circuit

41,43. . . filter

42. . . Amplifier

44. . . Capacitor

45. . . Coil

50. . . Vehicle antenna device

60. . . car

F. . . Direction of travel

L. . . Left direction

R. . . Right direction

The above and other objects, features, advantages and the like of the present invention will be described in detail in accordance with the embodiments illustrated herein.

Fig. 1A is a perspective view of a windshield of a vehicle in which a vehicle antenna device according to a first embodiment of the present invention is mounted, and a periphery thereof as seen from a vehicle interior side.

Fig. 1B is an enlarged plan view showing one of loop antennas constituting the antenna device for a vehicle shown in A.

Fig. 1C is an enlarged plan view showing another alternative of the loop antenna constituting the antenna device for a vehicle shown in Fig. 1A.

Fig. 1D is a plan view showing still another enlarged view of a loop antenna constituting the antenna device for a vehicle shown in Fig. 1A.

Fig. 1E is an enlarged plan view showing a loop antenna constituting a modification of the loop antenna shown in Fig. 1C.

Fig. 2A is a perspective view showing the appearance of a connector and a coaxial cable connected to a power supply terminal of the loop antenna shown in Figs. 1A to 1E.

Fig. 2B is an exploded perspective view of the connector shown in Fig. 2A.

Fig. 3A is a view showing an example of the circuit board shown in Fig. 2B as seen from the back side.

Fig. 3B is a block circuit diagram showing the internal configuration of an amplifier mounted on the circuit substrate shown in Fig. 3A.

Fig. 3C is a view showing another example of the circuit substrate shown in Fig. 2B as seen from the back side.

Fig. 4A is a plan view showing the configuration of a double loop antenna which can be used in place of the loop antenna shown in Fig. 1B.

Fig. 4B is a perspective view showing the configuration of a connector connected to a power supply terminal of the loop antenna shown in Fig. 4A.

Fig. 5 is a circuit diagram showing a connection between a vehicle antenna device according to a first embodiment of the present invention and a satellite navigation device mounted on a vehicle.

Fig. 6A is an explanatory view showing the directivity in the case where the film type antenna shown in Fig. 1D is provided in the vicinity of the dielectric.

Fig. 6B is an explanatory view showing the directivity of the case where the film type antenna shown in Fig. 1B is provided in the vicinity of the dielectric.

Fig. 6C is an explanatory view showing the directivity of the case where the film type antenna shown in Fig. 1C is provided in the vicinity of the dielectric.

Fig. 6D is an explanatory view showing the directivity of the vertical direction in the case where the film type antenna shown in Figs. 6A to 6C is provided on the upper portion of the windshield of the automobile.

Fig. 7A is a perspective view of a windshield of a vehicle in which a vehicle antenna device according to a second embodiment of the present invention is mounted, and a periphery thereof as seen from a vehicle interior side.

Fig. 7B is a perspective view showing the windshield of only the automobile, which is a modification of the vehicle antenna device shown in Fig. 7A, as seen from the inside of the vehicle interior.

Fig. 7C is an enlarged plan view showing one of the loop antennas constituting the antenna device for a vehicle shown in Fig. 7B.

Fig. 7D is an enlarged plan view showing another alternative of the loop antenna constituting the antenna device for a vehicle shown in Fig. 7A.

FIG. 8 is an explanatory view showing the directivity of the film-type antenna provided in the lower portion of the windshield of the automobile of the vehicle antenna device according to the second embodiment of the present invention.

Fig. 9A is a perspective view showing the windshield of only the automobile to which the vehicle antenna device according to the third embodiment of the present invention is attached, as seen from the inside of the vehicle interior.

Fig. 9B is a perspective view showing only the windshield of the automobile, which is a modification of the vehicle antenna device shown in Fig. 9A, as seen from the inside of the vehicle interior.

Fig. 9C is a perspective view showing the windshield of only the automobile in which the vehicle antenna device according to the fourth embodiment of the present invention is mounted, as seen from the inside of the vehicle interior.

Fig. 9D is a perspective view showing the windshield of only the automobile in which the vehicle antenna device according to the fifth embodiment of the present invention is mounted, as seen from the inside of the vehicle interior.

Fig. 10A is a plan view showing a vehicle in which the directivity of four antennas of the windshield of the automobile of the vehicle antenna device according to the first embodiment of the present invention shown in Fig. 1A is attached.

Fig. 10B is a plan view showing a vehicle in which the directivity of four antennas of the windshield of the automobile of the vehicle antenna device according to the second embodiment of the present invention shown in Fig. 6A is attached.

Fig. 10C is a plan view showing a vehicle in which the directivity of four antennas of the windshield of the automobile of the vehicle antenna device according to the third embodiment of the present invention shown in Fig. 7A is attached.

Fig. 10D is a plan view showing a vehicle in which the directivity of four antennas of the windshield of the automobile of the vehicle antenna device according to the fourth embodiment of the present invention shown in Fig. 7C is attached.

Fig. 10E is a plan view showing a vehicle in which the directivity of four antennas of the windshield of the automobile of the vehicle antenna device according to the fifth embodiment of the present invention shown in Fig. 7D is attached.

1. . . windshield

3. . . A column

8. . . Satellite navigation device

9. . . Dashboard

10A, 10B, 10C, 10D. . . Film antenna

20. . . Connector

twenty two. . . Coaxial cable

50. . . Vehicle antenna device

Claims (15)

An antenna device for a vehicle, which is provided in an antenna device provided in a fixed window of a vehicle, comprising: at least one loop antenna having directivity in a direction parallel to a front and rear direction of the vehicle; and at least one loop antenna , which has directivity in a direction deviating from the direction parallel to the front and rear directions of the vehicle; and a directional antenna having a directivity in a direction parallel to the front and rear directions of the vehicle, the two power supply terminals being opposite to the loop antenna The center line of the left and right sides is arranged symmetrically; the loop antenna having directivity is oriented in a direction deviating from the direction of the rear direction of the vehicle, and the two power supply terminals are arranged with respect to the center line dividing the loop antenna into left and right sides. Offset to either side. An antenna device for a vehicle, which is provided in a fixed window of a vehicle, comprising: a loop antenna, wherein two power supply terminals are arranged symmetrically with respect to a center line dividing the loop antenna into left and right; a loop antenna, two of which The power supply terminal is disposed to be shifted to the right side with respect to the center line dividing the loop antenna into left and right sides, and the loop antenna has two power supply terminals arranged to be shifted to the left side with respect to the center line dividing the loop antenna into left and right. The antenna antenna device according to claim 1, wherein the loop antenna having directivity in a direction parallel to a front-rear direction of the vehicle includes a first loop antenna provided on a left upper side of the window when viewed from a vehicle interior, And the second loop antenna provided on the upper right side of the window; the loop antenna having directivity in a direction deviating from a direction parallel to a front-rear direction of the vehicle, adjacent to the first loop antenna when viewed from a vehicle interior A third loop antenna provided on the right side and a fourth loop antenna provided adjacent to the left side of the second loop antenna. The vehicle antenna device according to claim 3, wherein the two power supply terminals included in the third loop antenna are different from the direction of the offset of the two power supply terminals included in the fourth loop antenna. The vehicle antenna device according to claim 4, wherein the third and fourth loop antennas include: conductors disposed in parallel with antenna elements along a direction of an upper edge of the window; and relative to the window A conductor in which the antenna elements in the direction of the upper edge portion are arranged in a direction perpendicular to each other. The antenna antenna device according to claim 1, wherein the loop antenna having directivity in a direction parallel to a front-rear direction of the vehicle includes a first loop antenna provided on a left upper side of the window when viewed from a vehicle interior, And the second loop antenna provided on the upper right side of the window; the loop antenna having directivity in a direction deviating from a direction parallel to the front and rear directions of the vehicle, which is disposed at the lower left of the window when viewed from the interior of the window a loop antenna and a fourth loop antenna disposed at a right lower side of the window; and the two power supply terminals of the third loop antenna and the offset direction of the two power supply terminals of the fourth loop antenna different. The vehicle antenna device according to claim 6, wherein a line member that is not connected to the antenna element constituting the third loop antenna is disposed adjacent to an antenna element farther from a power supply terminal of the third loop antenna a conductor; a linear conductor that is not connected to an antenna element constituting the fourth loop antenna is disposed adjacent to an antenna element farther from a power supply terminal of the fourth loop antenna. The vehicle antenna device according to claim 7, wherein the linear guide system includes a conductor parallel to the antenna element of the third loop antenna, and a conductor connected to both ends of the parallel conductor; the linear guide system further A conductor including an antenna element parallel to the fourth loop antenna and a conductor connected to both ends of the parallel conductor. The antenna antenna device according to claim 1, wherein the loop antenna having directivity in a direction parallel to a front-rear direction of the vehicle includes a first loop antenna disposed at a lower left side of the window when viewed from a vehicle interior, And the second loop antenna disposed at a right lower side of the window; the loop antenna having directivity in a direction deviating from a direction parallel to a front-rear direction of the vehicle, which is disposed on a left side of the window when viewed from a vehicle interior a third loop antenna and a fourth loop antenna disposed on a right upper side of the window; and the two power supply terminals of the third loop antenna and the offset direction of the two power supply terminals of the fourth loop antenna different. The vehicle antenna device according to claim 9, wherein a line element that is not connected to the antenna element constituting the first loop antenna is disposed adjacent to an antenna element farther from a power supply terminal of the first loop antenna a conductor; a linear conductor that is not connected to the antenna element constituting the second loop antenna is disposed adjacent to an antenna element farther from a power supply terminal of the second loop antenna. The vehicle antenna device according to claim 10, wherein the linear guide system includes a conductor parallel to the antenna element of the first loop antenna, and a conductor connected to both ends of the parallel conductor; the linear guide system further A conductor including an antenna element parallel to the second loop antenna and a conductor connected to both ends of the parallel conductor. The vehicle antenna device according to claim 1, wherein the loop antenna having directivity in a direction parallel to a front-rear direction of the vehicle includes one of a left upper side and a top right side of the window when viewed from a vehicle interior. a first loop antenna; the loop antenna having directivity in a direction deviating from a direction parallel to a front-rear direction of the vehicle includes a second loop disposed along a direction of an upper edge of the window when viewed from a vehicle interior And an antenna and a third loop antenna; and a fourth loop antenna provided on one of a left lower left and a lower right side of the window; two power supply terminals provided in the second loop antenna; and two power antennas provided in the third loop antenna The directions of the aforementioned offsets of the power supply terminals are different. The vehicle antenna device according to claim 12, wherein the two power supply terminals included in the fourth loop antenna are provided to be shifted to a vehicle body side of the vehicle by dividing the fourth loop antenna into left and right center lines. . The vehicle antenna device according to claim 13, wherein a line member that is not connected to the antenna element constituting the fourth loop antenna is disposed adjacent to an antenna element farther from a power supply terminal of the fourth loop antenna conductor. The vehicle antenna device according to claim 14, wherein the linear guide system includes a conductor parallel to the antenna element of the fourth loop antenna and a conductor connected to both ends of the parallel conductor.