US-12620695-B2 - Vehicle mounted antenna

Abstract

A vehicle mounted antenna is inside a cockpit module. The vehicle mounted antenna is positioned above a duct in the cockpit module at least a certain distance from an on-board device that is a source of noise and that is positioned below the duct. The duct is installed via a metal bracket that has a higher heat conductivity than the vehicle mounted antenna.

Inventors

• Suguru Sekita
• Mitsunori Nakamura

Assignees

• NISSAN MOTOR CO., LTD.

Dates

Publication Date

20260505

Application Date

20211207

Claims (6)

1. 1 . A vehicle mounted antenna in a cockpit module, wherein the vehicle mounted antenna is positioned above a duct in the cockpit module at least a certain distance from an on-board device that is a source of noise and that is positioned below the duct, the vehicle mounted antenna is installed via a metal bracket that has a higher heat conductivity than the vehicle mounted antenna such that a heat generated in the vehicle mounted antenna and in the duct is transmitted to the metal bracket, and the vehicle mounted antenna is positioned a distance from a top of the cockpit module.
2. 2 . The vehicle mounted antenna according to claim 1 , wherein the vehicle mounted antenna is positioned at least a certain distance from left and right A-pillars.
3. 3 . The vehicle mounted antenna according to claim 1 , wherein the vehicle mounted antenna is positioned below a front window.
4. 4 . The vehicle mounted antenna according to claim 1 , wherein an upper part of the vehicle mounted antenna has glass transparency, and the vehicle mounted antenna is capable of 5G communication.
5. 5 . The vehicle mounted antenna according to claim 1 , wherein the metal bracket has a higher heat conductivity than the duct.
6. 6 . The vehicle mounted antenna according to claim 1 , wherein the on-board device is installed on a surface of the duct that is opposite to an installation surface of the vehicle mounted antenna across the duct.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a U.S. national stage application of International Application No. PCT/JP2021/045007, filed on Dec. 7, 2021. BACKGROUND Technical Field The present invention relates to a vehicle mounted antenna. Background Information Vehicle mounted antennas that can reduce electromagnetic noise have been disclosed in the prior art. For example, Japanese Laid-Open Patent Application No. 2008-78971 (Patent Citation 1) discloses a receiving antenna comprising a horizontally polarized receiving antenna that reduces and eliminates reception of electromagnetic noise having vertically polarized directionality, a vertically polarized receiving antenna that reduces and eliminates reception of electromagnetic noise having horizontally polarized directionality, and a signal-combining and -selecting means that is connected to the horizontally polarized receiving antenna and the vertically polarized receiving antenna and that selects or combines received signals from these receiving antennas, in order to reduce electromagnetic noise generated from a wire harness installed inside a vehicle. SUMMARY However, the prior-art technologies of Patent Citation 1, etc., present a problem in terms of being a combination of antennas that function through the difference in polarization directions, and still being affected by noise, depending on the direction from which the noise arrives. The problem of heat being readily generated becomes noticeable when high-frequency communication is performed, such as with a 5th generation mobile communication system (5G). The present invention was devised in view of the problems described above, providing a vehicle mounted antenna that reduces the effects from noise inside the vehicle, properly dissipates generated heat, and enables satisfactory communication. A vehicle mounted antenna according to one aspect of the present invention is a vehicle mounted antenna inside a cockpit module, the vehicle mounted antenna being positioned above a duct inside the cockpit module, at least a certain distance from an on-board device that is a source of noise and that is positioned below the duct. According to the present invention, the effects from noise inside a vehicle are reduced, generated heat is properly released, and satisfactory communication can be performed. BRIEF DESCRIPTION OF THE DRAWINGS Referring now to the attached drawings which form a part of this original disclosure, an illustrative embodiment is shown. FIG. 1 shows one example of the positioning of a vehicle mounted antenna as seen from a lateral direction of a vehicle; FIG. 2 shows one example of the positioning of the vehicle mounted antenna as seen from a front direction of the vehicle; and FIG. 3 shows a problem in a prior-art example such as that of Patent Citation 1. DETAILED DESCRIPTION An exemplary embodiment of the present disclosure shall be described below with reference to the drawings. An example of positioning a vehicle mounted antenna 11 according to the present embodiment shall be described with reference to FIGS. 1 and 2. FIG. 1 shows one example of the positioning of the vehicle mounted antenna 11 as seen from a lateral direction of a vehicle 1, and FIG. 2 shows one example of the positioning of the vehicle mounted antenna 11 as seen from a front direction of the vehicle 1. FIG. 2 depicts an upper case of a cockpit module 10. As shown in FIGS. 1 and 2, the vehicle mounted antenna 11 according to the present embodiment is positioned inside the cockpit module 10 above a duct 12 such as that of an air conditioner, at least a certain distance from an on-board device 13 that is a source of noise. The vehicle mounted antenna 11 is used for on-board radio media and communication. There are no particular limitations on the on-board device 13 that is a source of noise; for example, the on-board device 13 is an actuator, an electrical component, a harness, or the like, which is a component of a blower motor or the like and is a source of electromagnetic noise. It is desirable that the duct 12 and the on-board device 13 that is a source of noise do not come into contact with each other. FIG. 3 shows a problem in a prior-art example such as that of Patent Citation 1. In Patent Citation 1, to reduce electromagnetic noise in the vehicle, an antenna comprises a horizontally polarized receiving antenna that reduces and eliminates reception of electromagnetic noise having vertically polarized directionality, and a vertically polarized receiving antenna that reduces and eliminates reception of electromagnetic noise having horizontally polarized directionality, and received signals from these receiving antennas are selected or combined. However, as shown in FIG. 3, the horizontally polarized antenna picks up noise in a 45° direction as well as noise in the horizontal polarization direction, and the vertically polarized antenna picks up noise in the 45° direction as well as noise in the vertica