JP3743263B2 - Antenna device for automobile telephone - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antenna device for an automobile telephone mounted on an automobile.
[0002]
[Problems to be solved by the invention]
Conventionally, a trunk pole antenna as shown in FIG. 6 has been provided as an antenna for a car phone mounted on a car. In FIG. 6, a trunk pole antenna 1 is attached to a trunk 3 of an automobile 2 and is connected to a radio device 4 installed in the trunk 3 through a feeder line 5, for example. The wireless device 4 is connected to a controller (communication device) 7 installed in the passenger compartment 6 through a signal line 8.
[0003]
In this case, since the trunk pole antenna 1 is mounted outside the passenger compartment 6 of the automobile 2, there is an advantage that it is hardly affected by the body (metal body), and an antenna element of a dipole antenna system ideal as an antenna. Since the antenna is used, there is an advantage that the antenna performance is relatively excellent.
[0004]
However, since the trunk pole antenna 1 is attached to the outside of the passenger compartment 6 of the automobile 2, it is necessary to secure the strength of the antenna itself, to improve the waterproof performance, and to attach the trunk pole antenna 1 to the trunk 3. It is necessary to prepare a dedicated strong bracket, which causes a problem that the cost is relatively high. In addition to this, there is a problem that the aesthetic appearance of the automobile 2 is impaired, and there is also a problem that the generation of wind noise during driving is caused. In addition, there is a problem that the vehicle is stolen or damaged by mischief, and further, for example, when automatic car washing is performed at a gas station or the like, there is a problem that it is necessary to remove it every time.
[0005]
On the other hand, a glass printed antenna as shown in FIG. 7 is provided as another automobile phone antenna mounted on an automobile. In FIG. 7, the glass printed antenna 9 is embedded in the rear window glass 10 of the automobile 2 and is connected to the wireless device 4 through the feeder line 5 in the same manner as the trunk pole antenna 1 described above. It has become.
[0006]
In this case, the glass printed antenna 9 is embedded in the rear window glass 10, that is, unlike the trunk pole antenna 1, it cannot be attached outside the passenger compartment 6 of the automobile 2. There is an advantage that various problems in the antenna 1 can be solved.
[0007]
However, since the glass printed antenna 9 is embedded in the rear window glass 10, it cannot be denied that the antenna performance is inferior to the trunk pole antenna 1 described above, and the radio wave environment such as a weak electric field region is relatively inferior. In the region, there is a problem that the communication quality is deteriorated such that the communication line cannot be established or the voice is interrupted. In addition, since the antenna performance is affected by the shape of the window frame and the window glass and the surrounding environment, it is necessary to adjust the antenna element for each vehicle type, which increases the development man-hours.
[0008]
Further, the following problems are common to both the trunk pole antenna 1 and the glass printed antenna 9. That is, since the trunk pole antenna 1 or the glass printed antenna 9 and the wireless device 4 are connected through the feeder line 5, in addition to the feeder line 5 and the feeder connector (not shown), In addition, it is necessary to prepare a clamp for fixing the power supply line 5 and the power supply line 5 and the power supply connector are relatively expensive, so that there is a problem that the cost of the entire mobile phone becomes relatively high. . There is also a problem that it is necessary to perform work for examining the wiring of the power supply line 5 and work for laying the power supply line 5. Furthermore, there is also a problem that antenna performance deteriorates due to transmission loss occurring in the feeder line 5.
[0009]
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an antenna device for a car phone that can solve various problems in a trunk pole antenna and a glass printed antenna.
[0010]
[Means for Solving the Problems]
According to the antenna device for a car phone according to claim 1, the telephone antenna, the GPS antenna, and the wireless means are integrated, and the feeding point of the antenna element of the telephone antenna and the RF input for the telephone of the wireless means are provided. Since the wireless means is directly attached to the cover that covers the telephone antenna and the GPS antenna directly connected to the output point, unlike the conventional trunk pole antenna and glass printed antenna, It is possible to eliminate the need for a feed line for connecting the antenna and the wireless means, and thereby various problems that may occur due to the feed line when a trunk pole antenna and a glass printed antenna are used. Can be solved. In addition, it can solve the problems inherent to the trunk pole antenna by installing it in a vehicle interior and in a place with a good radio wave environment. By not installing it in the window glass, the problem inherent to the glass printed antenna can be solved. Can be solved.
[0011]
According to the antenna device for a car phone according to claim 2, the telephone antenna, the GPS antenna, the amplifying means, and the radio means are integrated, and the amplifying means and the GPS RF input / output point of the radio means are directly connected. Since it is configured to connect, in addition to eliminating the need for a power supply line for connecting between the telephone antenna and the wireless means, a power supply line for connecting between the amplifying means and the wireless means is provided. Ru can also be unnecessary.
[0012]
Further, according to the automobile telephone antenna device according to claim 1, provided with an antenna the antenna elements of the telephone on the telephone ground plate, the higher and antenna for telephone than the GPS antenna telephone ground plate antenna It was installed at a position lower than the element. For this purpose, a rising portion is formed integrally with the telephone ground plate, a GPS ground plate is provided on the upper surface of the rising portion, and a GPS antenna is provided on the GPS ground plate.
[0013]
First, the telephone antenna 12 will be described. In the telephone antenna 12, the telephone ground plate 14 is fixed by being screwed over substantially the entire top surface of the radio device 13. On one end side of the telephone ground plate 14, a transmitting / receiving antenna element 15 that constitutes a known inverted-F antenna having a relatively low overall height including a radiation plate 15 a, a short-circuit plate 15 b, and a power feeding plate 15 c is provided upright. ing. The radiation plate 15a is formed with a notch for securing a frequency band of radio waves that can be radiated and captured, and between the lower end of the power feeding plate 15c and the ground plate 14 for telephone, A cylindrical resin 16 is interposed to ensure insulation between the two.
[0014]
On the other hand, on the other end side of the telephone ground plate 14, there is a reception-only antenna element 17 that constitutes a known inverted-F antenna having a relatively low overall height including the radiation plate 17a, the short-circuit plate 17b, and the power feeding plate 17c. It is erected. The radiating plate 17a is formed with a notch for securing a frequency band of radio waves that can be captured in the same manner as the radiating plate 15a described above, and a lower end of the power feeding plate 17c and a ground plate for a telephone. A columnar resin 18 is interposed between the two and 14 to ensure insulation between the two.
[0015]
A distance of about 0.3λ (λ indicates the wavelength of the radio wave) is secured between the antenna element 15 for both transmission and reception and the antenna element 17 dedicated for reception, so that diversity reception can be performed satisfactorily. It is configured to be possible.
[0016]
Next, the wireless device 13 will be described. The wireless device 13 has a flat rectangular parallelepiped shape, and a circuit board (not shown) on which electronic components (not shown) for performing wireless processing are mounted is disposed. One end of a power line 19 for supplying drive power to the radio 13 is connected to one side surface 13a of the radio 13 and the other end of the power line 19 is connected to the automobile 20 (see FIG. 2). ) Is connected to a battery (not shown). A female 16-core connector 21 is embedded in one side surface portion 13 a of the wireless device 13, and the female 16-core connector 21 is embedded in a connector cover 23 at one end of the signal line 22. A male 16-core connector 24 is attached.
[0017]
Now, in the antenna element 15 for both transmission and reception, between the feeding point 25 constituted by the lower end portion of the feeding plate 15c and the RF input / output point 26 for the telephone on the wireless device 13 side, both are electrically connected. Are also directly connected to the antenna element 17 dedicated to reception and between the feed point 27 constituted by the lower end of the feed plate 17c and the RF input point 28 for the telephone on the radio 13 side. It is electrically connected directly.
[0018]
A cover 29 made of resin is attached to the radio device 13 by screws so as to cover the ground plate 14, the antenna element 15 for both transmission and reception, and the antenna element 17 for reception only in the telephone antenna 12. .
[0019]
As shown in FIG. 2, the antenna device 11 for a car phone configured as described above is installed in a compartment 30 of the automobile 20 and on a rear tray 31. And a controller (communication device) 32 installed in the vicinity thereof through a signal line 22. In this case, the antenna device 11 for a car phone is not limited to being installed on the rear tray 31, but can be installed on an instrument panel (not shown) in the passenger compartment 30. It has become.
[0020]
Here, the inventors have demonstrated the antenna performance of the conventional trunk pole antenna, the conventional glass printed antenna, the antenna device 11 for the automobile telephone according to the present embodiment, and the antenna 12 for the telephone according to the present embodiment when the feeder line is used. Evaluated. FIG. 3 shows the evaluation results. The evaluation is performed using a frequency band of 800 MHz, using a 2.5 meter-long feeder, rotating the vehicle 360 degrees with the antenna or antenna device mounted on the vehicle, and the horizontal plane at that time. This is done by measuring the average gain inside (in the direction of elevation angle 0 degree), and the higher the average gain, the better the antenna performance.
[0021]
As is clear from FIG. 3, the antenna performance of the automobile telephone antenna device 11 according to this example is a conventional trunk pole antenna ratio “−1 dB” and a conventional glass printed antenna ratio “+5 dB”. Here, in the conventional trunk pole antenna ratio “−1 dB”, the difference depending on the antenna installation location is the conventional trunk pole antenna ratio “−2 dB”, and the difference due to the radiation efficiency of the antenna itself is the conventional trunk pole antenna ratio “ −1 dB ”, and the difference due to the transmission loss of the feeder line depends on the conventional trunk pole antenna ratio“ +2 dB ”. Further, if the frequency band is 1500 MHz and 2000 MHz, the transmission loss of the feeder line becomes large, and accordingly, the antenna performance of the antenna device 11 for a car telephone according to the present embodiment is improved accordingly.
[0022]
As described above, according to the first embodiment, the telephone antenna 12 and the wireless device 13 are integrated, and the feeding point 25 of the antenna element 15 for transmitting and receiving in the telephone antenna 12 and the wireless device 13 are integrated. Since the RF input / output point 26 for the telephone on the side is directly connected, the feeding point 27 of the antenna element 17 dedicated for reception is directly connected to the RF input point 28 for the telephone on the radio 13 side. Unlike conventional trunk pole antennas and glass printed antennas, it is possible to eliminate the need for a power supply line for connecting the telephone antenna 12 and the radio 13, whereby the trunk pole antenna and the glass can be eliminated. It is possible to solve various problems that may occur due to the feeder line when the printed antenna is used. In addition, the problem inherent to the trunk pole antenna can be solved by installing it in the vehicle compartment 30 of the automobile 19 and in a place with a good radio wave environment. Can solve the problem.
[0023]
In addition, since it can be installed on the rear tray 31 or the instrument panel in the passenger compartment 30, it can be installed on the rear tray 31 or the instrument panel, which is one of the places where the radio wave environment is most excellent in the passenger compartment 30. By installing the antenna on the top, the antenna performance can be improved accordingly.
[0024]
Furthermore, since a well-known inverted-F antenna having a relatively low overall height is adopted as the antenna element 15 for both transmission and reception and the antenna element 17 dedicated to reception, the overall height can be increased even when installed on the rear tray 31 in the passenger compartment 30. Since the distance is relatively low, it is possible to ensure a good rear view.
[0025]
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. Hereinafter, different parts will be described.
In the second embodiment, a GPS antenna function is added to the antenna device 11 for a car telephone described in the first embodiment. That is, in FIG. 4, the antenna device 41 for a car telephone is configured by integrating a telephone antenna 42, a GPS antenna 43, an amplifier 44 (amplifying means in the present invention), and a radio 45. Therefore, compared with the automobile telephone antenna device 11 described in the first embodiment, the overall size in the longitudinal direction is larger.
[0026]
First, the telephone antenna 42 will be described. In the telephone antenna 42, the transmitting / receiving antenna element 15 described in the first embodiment is disposed between one end of the telephone ground plate 46 between the lower end of the power feeding plate 15 c and the telephone ground plate 46. The cylindrical resin 16 is erected and the antenna element 17 dedicated to reception described in the first embodiment is connected to the lower end of the power feeding plate 17c at the substantially central portion of the ground plate 46 for telephone. A cylindrical resin 18 is interposed between the telephone ground plate 46 and standing. Also in this case, a distance of about 0.3λ (λ indicates the wavelength of the radio wave) is secured between the antenna element 15 for both transmission and reception and the antenna element 17 for reception, so that diversity reception can be performed satisfactorily. It is configured to be possible.
[0027]
A rising portion 46a is formed on the other end side of the telephone ground plate 46, and a GPS ground plate 48 is arranged on the upper surface of the rising portion 46a with a flat insulating resin 47 interposed therebetween. It is installed. A GPS antenna 43 made of a well-known patch antenna is disposed on the upper surface of the GPS ground plate 48, and between the lower surface of the rising portion 46 a and the upper surface of the radio device 45. An amplifier 44 connected to the GPS antenna 43 is provided.
[0028]
Next, the wireless device 45 will be described. The wireless device 45 has a flat rectangular parallelepiped shape in the same manner as the wireless device 13 described in the first embodiment, and an electronic component (not shown) for performing wireless processing is mounted therein. A circuit board (not shown) is provided. One end of the power line 19 described in the first embodiment is connected to one side surface 45a of the wireless device 45, and a female 16-core connector 21 is embedded therein. The 16-core connector 21 is fitted with a male 16-core connector 51 embedded in a connector cover 50 at one end of the signal line 49.
[0029]
In this case as well, between the feeding point 25 constituted by the lower end of the feeding plate 15c in the antenna element 15 for both transmission and reception and the RF input / output point 26 on the wireless device 13 side, both are electrically connected directly. In addition, the antenna element 17 dedicated to reception and the feed point 27 constituted by the lower end portion of the feed plate 17c and the RF input / output point 28 on the radio 13 side are both electrically connected directly. Has been. In this case, the amplifier 44 and the GPS RF input / output point 52 on the wireless device 45 side are also electrically connected directly.
[0030]
A cover 53 made of resin is provided on the radio antenna 45 so as to cover the ground plate 46, the antenna element 15 for both transmission and reception, the antenna element 17 dedicated to reception, the GPS antenna 43, and the amplifier 44 in the telephone antenna 42. It is attached with screws.
[0031]
As shown in FIG. 4, the car phone antenna device 41 configured in this way is located in the compartment 30 of the car 20 and has a rear tray in the same manner as the car phone antenna device 11 described in the first embodiment. For example, a signal line 49 is connected between a controller (communication device) 32 and a GPS controller (communication device) 54 that are installed on the vehicle 31 and located inside or around the console box. Connected.
[0032]
As described above, according to the second embodiment, the GPS antenna 43, the amplifier 44, and the radio device 45 are integrated, and the amplifier 44 and the GPS RF input / output point 52 of the radio device 45 are directly connected. Thus, in addition to eliminating the need for a power supply line for connecting the telephone antenna 42 and the radio unit 45, a power supply for connecting the amplifier 44 and the radio unit 45 is also provided. An electric wire can also be dispensed with, whereby a configuration having a GPS antenna function can be handled. For example, the present invention can be applied to an emergency call system or a physical distribution management system using GPS.
[0033]
(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows.
The shape of the inverted F antenna may be other shapes as long as desired antenna performance can be obtained.
[0034]
The first embodiment is not limited to the configuration in which the feeder line is connected to the side surface portion on the side of the antenna element for both transmitting and receiving and the female 16-core connector is embedded in the wireless device. The feeder may be connected to the side surface on the side of the dedicated antenna element and the female 16-core connector may be embedded. In the second embodiment, the side surface on the side of the GPS antenna is used. A structure in which a feeder line is connected to the female and a female 16-core connector is embedded may be employed.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing a first embodiment of the present invention. FIG. 2 is a view showing a state mounted on an automobile. FIG. 3 is a view showing an evaluation result. FIG. 4 is a second embodiment of the invention. FIG. 5 is an equivalent perspective view of FIG. 2. FIG. 6 is a diagram showing a conventional example. FIG. 7 is a diagram showing another conventional example.
In the drawings, 11 is an antenna device for an automobile telephone, 12 is an antenna for a telephone, 13 is a radio (wireless means), 15 is an antenna element for both transmission and reception, 17 is an antenna element dedicated to reception, 25 is a feeding point, and 26 is a feeding point. RF input / output point for telephone, 27 is a feeding point, 28 is an RF input point for telephone, 30 is a passenger compartment, 31 is a rear tray, 41 is an antenna device for an automobile telephone, 42 is an antenna for a telephone, 43 is for GPS , 44 is an amplifier (amplifying means), 45 is a radio (wireless means), 46 is a ground plate for telephone, 46a is a rising portion, 48 is a ground plate for GPS , 52 is an RF input / output point for GPS 53 is a cover .

Claims (2)

A telephone antenna having an antenna element, a GPS antenna, and wireless means for performing wireless processing;
The telephone antenna, the GPS antenna, and the wireless means are integrated, and a feeding point of an antenna element of the telephone antenna is directly connected to an RF input / output point for the telephone of the wireless means, The wireless means is directly attached to a cover that covers a telephone antenna and a GPS antenna ,
An antenna element for the telephone antenna is provided on the telephone ground plate,
Further, a rising portion is integrally formed on the telephone ground plate, a GPS ground plate is provided on the upper surface of the rising portion, and the GPS antenna is provided on the GPS ground plate. An antenna device for a car phone, wherein the antenna for a telephone is provided at a position higher than the ground plate for the telephone and lower than an antenna element of the antenna for the telephone. Amplifying means connected to the GPS antenna,
The telephone antenna, the GPS antenna, the amplification means, and the wireless means are integrated, and the amplification means and the GPS RF input / output point of the wireless means are directly connected. The antenna device for a car telephone according to claim 1.

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