Vehicle Antenna

Abstract

An in-vehicle antenna 11 in a cockpit module 10 is disposed above a duct 12 at a certain distance or more from an in-vehicle device 13, which is a noise source disposed below the duct 12 in the cockpit module 10.

Description

[Technical field]

[0001] The present invention relates to an on-vehicle antenna. [Background technology]

[0002] Conventionally, vehicle-mounted antennas capable of reducing electromagnetic noise have been developed.

[0003] For example, Patent Document 1 discloses a receiving antenna that includes a horizontally polarized receiving antenna that reduces or eliminates reception of electromagnetic noise having vertical polarization directivity, a vertically polarized receiving antenna that reduces or eliminates reception of electromagnetic noise having horizontal polarization directivity, and a signal synthesis / selection means that is connected to the horizontally polarized receiving antenna and the vertically polarized receiving antenna and selects or synthesizes reception signals from these receiving antennas, in order to reduce electromagnetic noise generated from a wire harness arranged inside a vehicle. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-78971 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the conventional techniques such as Patent Document 1 combine antennas with different polarization directions, and still suffer from the problem of being affected by noise depending on the direction from which the noise arrives.

[0006] In addition, when performing high-frequency communications such as 5G (5th generation mobile communication system), the problem of heat generation becomes more pronounced.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide an in-vehicle antenna that reduces the effects of noise inside the vehicle, properly dissipates generated heat, and enables good communication. [Means for solving the problem]

[0008] The vehicle-mounted antenna 11 according to one embodiment of the present invention is an vehicle-mounted antenna 11 in a cockpit module 10, and is arranged at the top of the duct 12 at a certain distance or more from a vehicle-mounted device 13, which is a noise source arranged at the bottom of a duct 12 in the cockpit module 10. Effect of the Invention

[0009] According to the present invention, it is possible to reduce the influence of noise inside the vehicle and also to properly dissipate generated heat, thereby enabling good communication. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an example of the arrangement of an in-vehicle antenna 11 as viewed from the side of a vehicle 1. As shown in FIG. [Diagram 2] FIG. 2 is a diagram showing an example of the arrangement of the vehicle-mounted antenna 11 as viewed from the front of the vehicle 1. As shown in FIG. [Diagram 3] FIG. 3 is a diagram showing problems in the conventional example disclosed in Patent Document 1 and the like. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] [1. Configuration] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings.

[0012] An example of the arrangement of the vehicle-mounted antenna 11 according to this embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a diagram showing an example of the arrangement of the vehicle-mounted antenna 11 as viewed from the side of the vehicle 1, and Fig. 2 is a diagram showing an example of the arrangement of the vehicle-mounted antenna 11 as viewed from the front of the vehicle 1. Note that Fig. 2 shows an upper case of the cockpit module 10.

[0013] 1 and 2, the vehicle-mounted antenna 11 according to this embodiment is located inside a cockpit module 10, above a duct 12 for an air conditioner or the like, and at a certain distance from a vehicle-mounted device 13 that is a noise source. The vehicle-mounted antenna 11 is an antenna used for vehicle-mounted radio media and communications.

[0014] The on-board device 13 that is a noise source is not particularly limited, but may be, for example, an actuator, electrical equipment, harness, etc. that is a source of electromagnetic noise such as a blower motor. It is preferable that the on-board device 13 that is a noise source and the duct 12 are not in contact with each other.

[0015] Here, Fig. 3 is a diagram showing problems in the conventional example of Patent Document 1 etc. In Patent Document 1, in order to reduce electromagnetic noise inside a vehicle, a horizontally polarized receiving antenna that reduces or eliminates reception of electromagnetic noise having vertically polarized directivity and a vertically polarized receiving antenna that reduces or eliminates reception of electromagnetic noise having horizontally polarized directivity are provided, and reception signals from these receiving antennas are selected or combined.

[0016] However, as shown in Figure 3, a horizontally polarized antenna picks up noise in the 45° direction as well as noise in the horizontally polarized direction, and a vertically polarized antenna picks up noise in the 45° direction as well as noise in the vertical direction. Therefore, there is still a problem that the antenna is affected by noise coming from a specific direction, such as a 45° direction.

[0017] In this embodiment, as shown in Figures 1 and 2, the vehicle-mounted antenna 11 is disposed above a duct 12 such as an air conditioner, at a certain distance from the vehicle-mounted device 13, which is a source of electromagnetic noise, thereby reducing the effects of electromagnetic noise.

[0018] From the viewpoint of reducing electromagnetic noise, more specifically, as shown in Fig. 1, it is desirable to place the on-board device 13, which is a noise source, under the duct 12. By placing the on-board antenna 11 and the on-board device 13, which is an electromagnetic noise source, with the duct 12 between them, that is, by placing the on-board device 13, which is a noise generating source, on the surface of the duct that faces the installation surface of the on-board antenna 11 via the duct 12, the influence of electromagnetic noise can be further reduced.

[0019] In addition, in the case of a high-frequency antenna such as 5G, heat generation becomes significant, but by placing it at the top of the duct 12, it is expected that the heat will be exhausted from the duct 12. In addition, the installation may be performed taking into consideration the temperature of the air blown inside the air conditioner duct during heating.

[0020] Here, the vehicle-mounted antenna 11 is preferably installed so as to be thermally conductive with the duct 12. For example, as shown in Fig. 2, the vehicle-mounted antenna 11 may be installed on the upper part of the duct 12 via a metal bracket 14. This allows heat generated in the vehicle-mounted antenna 11 to be transferred to the duct 12 through the metal bracket 14.

[0021] Moreover, the metal bracket 14 may be a heat-conducting material having a higher thermal conductivity than the vehicle-mounted antenna 11, so that heat generated in the vehicle-mounted antenna 11 is efficiently transferred to the metal bracket 14. Moreover, the metal bracket 14 may be a heat-conducting material having a higher thermal conductivity than the duct 12, so that heat generated in the duct 12 is efficiently transferred to the metal bracket 14.

[0022] From the viewpoint of communication quality, it is desirable to place the vehicle-mounted antenna 11 near the center between the left and right A-pillars, for example, at a certain distance from the left and right A-pillars (front pillars). This makes it possible to suppress degradation of communication quality due to the influence of the A-pillars.

[0023] In addition, the vehicle-mounted antenna 11 may be disposed at a distance from the top of the cockpit module 10 according to the wavelength. For example, since the wavelength is short in 5G communication, the vehicle-mounted antenna 11 is disposed as close to the top of the cockpit module 10 as possible. This contributes to better communication quality.

[0024] From the viewpoint of communication quality, it is desirable that the vehicle-mounted antenna 11 has no obstruction such as a hood or a rule on the upper part. Specifically, the vehicle-mounted antenna 11 may be disposed on the lower part of the front window. The vehicle-mounted antenna 11 may also be capable of 5G communication and have a glass-transparent upper part. This can contribute to even better communication quality.

[0025] In addition, the cockpit module 10 may be what is called an instrument panel or a dashboard, in which case, in this embodiment, the "cockpit module" may be read as the "instrument panel" or the "dashboard".

[0026] This concludes the description of one example of this embodiment. Note that the layout examples and elements described in this embodiment may be implemented in any combination.

[0027] [2. Effects] According to the embodiment described above in detail, the following effects are achieved.

[0028] The vehicle-mounted antenna 11 according to this embodiment is an in-vehicle antenna 11 in a cockpit module 10, and is disposed above a duct 12 in the cockpit module 10 at a certain distance from the in-vehicle device 13, which is a noise source. As a result, since it is disposed at a certain distance from the in-vehicle device 13, which is a noise source, the influence of noise inside the vehicle is reduced, and since it is disposed above the duct 12, the generated heat can be appropriately released, enabling good communication.

[0029] Furthermore, the vehicle-mounted antenna 11 may be installed so as to be thermally conductive to the duct 12. This allows the heat generated by the vehicle-mounted antenna 11 to be efficiently released.

[0030] The vehicle-mounted antenna 11 may be installed via the duct 12 and the metal 14. This allows the heat generated by the vehicle-mounted antenna 11 to be efficiently released, and the influence of electromagnetic noise can be shielded by the metal.

[0031] Furthermore, the metal 14 may be a metal bracket 14 having a higher thermal conductivity than the vehicle-mounted antenna 11. This allows the heat generated in the vehicle-mounted antenna 11 to be transferred to the metal bracket 14 efficiently.

[0032] Also, the vehicle-mounted antenna 11 may be disposed near the center of the A-pillar at a certain distance from the left and right A-pillars, thereby preventing a decrease in communication quality due to the A-pillars.

[0033] In addition, the vehicle-mounted antenna 11 may be arranged at a distance from the cockpit module according to the wavelength. The shorter the wavelength, such as in 5G communication, the better the communication quality can be achieved by installing the vehicle-mounted antenna 11 on the top of the cockpit module 10.

[0034] Moreover, the vehicle-mounted antenna 11 may be disposed under the front windshield. Since there is no obstruction such as a hood or a curtain above the vehicle-mounted antenna 11, this contributes to communication quality.

[0035] In addition, the vehicle-mounted antenna 11 is capable of 5G communication, and the upper part may be made of transparent glass, which can contribute to even better communication quality.

[0036] The vehicle-mounted device 13 may also be disposed below the duct 12. This allows the vehicle-mounted device 13 to be disposed opposite the vehicle-mounted antenna 11 at the upper part of the duct 12 with the duct 12 in between, thereby further reducing the influence of electromagnetic noise.

[0037] The metal bracket 14 may be a heat-conducting member having a higher thermal conductivity than the duct 12, so that the heat generated in the duct 12 is efficiently transferred to the metal bracket 14 side.

[0038] 3. Other embodiments Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0039] In the above embodiment, the vehicle 1 is described on the assumption that the vehicle 1 has one on-board device 13 that is a source of electromagnetic noise. However, the vehicle 1 may have a plurality of on-board devices 13.

[0040] A plurality of functions possessed by one component in the above embodiments may be realized by a plurality of components, or a single function possessed by one component may be realized by a plurality of components. A plurality of functions possessed by a plurality of components may be realized by a single component, or a single function realized by a plurality of components may be realized by a single component. A part of the configuration of the above embodiments may be omitted. At least a part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0041] 1 vehicle 10 Cockpit Module 11 Vehicle antenna 12 Duct 13 Onboard equipment 14 Metal (bracket)

Claims

1. An on-board antenna in a cockpit module, The device is placed at the top of the duct at a certain distance from the on-board device that is a noise source located at the bottom of the duct in the cockpit module. The duct is installed via a metal bracket having a higher thermal conductivity than the vehicle-mounted antenna. Car antenna.

2. It is placed at a certain distance from the left and right A-pillars. The vehicle-mounted antenna according to claim 1 .

3. The distance from the cockpit module was determined according to the wavelength. The vehicle-mounted antenna according to claim 1 or 2.

4. Located at the bottom of the front window, 4. The vehicle-mounted antenna according to claim 1.

5. The top is made of transparent glass and is capable of 5G communication.

5. The vehicle-mounted antenna according to claim 1.

6. The metal bracket has a higher thermal conductivity than the duct.

6. The vehicle-mounted antenna according to claim 1.

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