JP2023112885A - On-vehicle communication device - Google Patents

Abstract

To improve communication establishment in an on-vehicle communication device having a wireless communication function.SOLUTION: In an on-vehicle communication device, a transmission/reception antenna 2d and a transmission antenna 2e are formed on a DCM substrate 2 carrying a function for communicating externally. Here, the DCM substrate 2 is disposed for a principal surface 20 to be almost parallel to a plane with a width direction of a vehicle 1 as its perpendicular, and also disposed for the transmission/reception antenna 2d to be located on a front window 12 side of the vehicle 1 and on an upper side from the transmission antenna 2e. By doing so, mutual interference between a radio wave (transmission radio wave) on the transmission/reception antenna 2d side and a radio wave (a reception radio wave) on the reception antenna 2e side can be suppressed. Even when the power of a transmission signal transmitted from the transmission/reception antenna 2d is small, the radio wave (transmission radio wave) from the inside of the vehicle toward the outside of the vehicle can be efficiently transmitted without being disturbed by a metallic portion forming a vehicle skeleton.SELECTED DRAWING: Figure 3

Description

The present invention relates to an in-vehicle communication device having at least one or more communication antennas provided on a board for communicating with an out-of-vehicle device.

2. Description of the Related Art Conventionally, there is a telematics system in which a communication system is installed in a vehicle, various information related to the vehicle is transmitted to an external storage device such as an external server, and the external server provides services to users based on the various information. For example, in the communication device described in Patent Document 1, a TEL antenna for communicating with a telematics service center, a GNSS antenna for receiving radio waves from artificial satellites, and wireless communication for controlling wireless communication with the outside. A control unit and an in-vehicle communication control unit that performs CAN communication with in-vehicle equipment, transmits vehicle status information to the wireless communication control unit, and outputs service information output from the wireless communication control unit to the in-vehicle equipment. . Then, the service information input from the external server is displayed on the display device, which is one of the in-vehicle devices.

JP 2020-174249 A

By the way, there is a demand to further improve the communication feasibility in a system that performs wireless communication with the outside as disclosed in Patent Document 1.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to improve communication feasibility in a vehicle communication device having a wireless communication function.

To achieve the above object, the present invention provides an in-vehicle communication device in which a communication antenna for communicating with an external device is provided on a substrate, wherein the communication antenna has a transmission function. There are one antenna and a second antenna having a receiving function, the first antenna and the second antenna are arranged in different areas on the substrate, and the substrate includes the first antenna, It is characterized in that it is disposed in the vehicle interior in a state of being arranged above and/or on the vehicle window side of the second antenna (Claim 1).

Also, the second antenna may be arranged closer to the interior of the vehicle than the first antenna (Claim 2).

Further, the first antenna may be arranged in a range that at least partially overlaps the vehicle window when viewed from a direction perpendicular to the horizontal plane (Claim 3).

According to the first aspect of the invention, since the first antenna having a transmitting function and the second antenna having a receiving function are arranged in different areas on the substrate, the radio wave on the first antenna side and the second antenna side are separated from each other. Mutual interference with radio waves on the antenna side can be suppressed. In addition, since the first antenna is arranged above and/or on the vehicle window side of the second antenna, even if the power of the transmission signal transmitted from the first antenna is small, the metal portion forming the vehicle frame can Radio waves can be efficiently transmitted from inside the vehicle to outside without being disturbed.

According to the second aspect of the invention, the second antenna is arranged closer to the interior of the vehicle than the first antenna. Received radio waves coming from outside the vehicle are higher in power than those transmitted from inside the vehicle. The knowledge that it is possible to receive with an antenna was discovered. Therefore, by arranging the second antenna inside the vehicle, the reflected wave can be received efficiently.

According to the third aspect of the present invention, the radio waves transmitted from the first antenna can be prevented from being blocked by the metal parts of the vehicle body, so that the radio waves can be efficiently transmitted through the vehicle window.

1 is a schematic configuration diagram of a vehicle communication system including an in-vehicle communication device according to an embodiment of the present invention; FIG. FIG. 2 is a diagram showing an arrangement area of an antenna formed on the DCM substrate of FIG. 1; FIG. 2 is a diagram showing the arrangement position of the DCM board in FIG. 1 inside the vehicle and the arrangement position of the antenna; FIG. 3 is a diagram showing a modification of the arrangement area of the antennas in FIG. 2; FIG. 4 is a diagram showing a modification of the arrangement positions of the antennas in FIG. 3; FIG. 4 is a diagram showing a modification of the arrangement position of the DCM substrate of FIG. 3; FIG. 4 is a diagram showing a comparison of reception sensitivity between the case where there is no internal reflection inside the vehicle compartment and the case where there is internal reflection;

A vehicle communication system including an in-vehicle communication device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic configuration diagram of a vehicle communication system including an in-vehicle communication device according to one embodiment of the present invention, FIG. 2 is a diagram showing an arrangement area of an antenna formed on a DCM board, and FIG. It is a figure which shows the arrangement|positioning position in a vehicle, and the arrangement|positioning position of an antenna.

(Vehicle electrical configuration)
A vehicle communication system according to an embodiment of the present invention is a wireless communication system that generates various information based on various data acquired from a vehicle 1 and provides services to a user. A DCM (Data Communication Module) board 2 that constitutes a communication device, a plurality of ECUs (ECU_A3, ECU_B4, ECU_C5) that perform various controls of the vehicle 1, a navigation device 9, and an external server 8 (“external device” of the present invention). equivalent to ).

A vehicle 1 is an automobile having an engine as a drive source. The power of the engine is transmitted to the left and right drive wheels via the transmission. The transmission may be a continuously variable transmission, a stepped automatic transmission, or a manual transmission. Moreover, it may be an electric vehicle or a hybrid vehicle using an electric motor as a drive source.

Each ECU (ECU_A3, ECU_B4, ECU_C5) includes a microcomputer, and includes a CPU that executes various control programs and a memory that stores control programs and necessary data. The ECUs (ECU_A3, ECU_B4, ECU_C5) and the in-vehicle communication device (DCM board 2) are connected to a bus 6 so as to enable two-way communication with each other according to CAN (Controller Area Network) communication protocol. In addition, the in-vehicle communication device (DCM board 2) is also connected to the navigation device 9 through CAN communication, and the signal received from the GNSS antenna 2f described later (the signal indicating the positioning information from the artificial satellite 10) is transmitted to the navigation device. sent to 9.

Examples of each ECU (ECU_A3, ECU_B4, ECU_C5) include, for example, a body ECU that controls the operation of on-vehicle electrical components such as doors and turn signals of the vehicle 1; Based on the image from the external world recognition means), the camera ECU calculates the distance and relative speed to the obstacle (target), determines the possibility of collision with the obstacle, and the VSC-ECU performs brake control. , an EFI-ECU for controlling the throttle opening/closing degree of the engine and the amount of fuel injected by the fuel injector.

The various ECUs (ECU_A3, ECU_B4, ECU_C5) are configured to be able to acquire information from the vehicle speed sensor, accelerator opening sensor, and steering angle sensor used for their control via CAN communication.

The in-vehicle communication device (DCM board 2) acquires various data from various ECUs (ECU_A3, ECU_B4, ECU_C5), etc., and transmits specific data (a plurality of data) out of these data to the external server 8. , a CPU 2a, a memory 2b, a transmitting/receiving circuit 2c, a transmitting/receiving antenna 2d (corresponding to the "first antenna" of the present invention), and a receiving antenna. 2e (corresponding to the "second antenna" of the present invention), a GNSS antenna 2f, and a WiFi antenna 2g.

The CPU 2a executes various control programs and selects data to be transmitted from the transmission/reception circuit 2c to the external server 8 via the transmission/reception antenna 2d. The memory 2b also stores a ROM portion for storing control programs executed by the CPU 2a, types of services desired by the user (to be described later), and temporarily stores data obtained from each ECU (ECU_A3, ECU_B4, ECU_C5). and a RAM unit for storing. The CPU 2 a and memory 2 b are mounted on the main surface of the DCM board 2 . Note that the CPU 2a and the memory 2b may be mounted on a surface different from the surface on which various antennas are mounted.

Data (upload data) to be transmitted from the in-vehicle communication device (DCM board 2) to the external server 8 includes, for example, data indicating the position of the vehicle 1 when the ignition switch is turned off, gasoline remaining amount data, engine water temperature data, remaining battery level data, time required for the remaining battery level to satisfy the idling stop permission condition, outside temperature data, data indicating the door lock status of vehicle 1, wiper status (high speed or low speed, etc.) , vehicle speed data, time data, failure data, accelerator pedal operation state, brake pedal operation state, ON/OFF state of various switches, data for analysis, and the like. Note that these data are only examples, and necessary data is transmitted according to service information (for example, telematics service information) provided to the user.

Data transmitted from the in-vehicle communication device (DCM board 2) to the external server 8 is transmitted at a constant cycle (for example, a cycle of 90 seconds) according to its type, and each time a predetermined condition is satisfied, There is something to be sent.

The transmitting/receiving antenna 2d is an antenna that transmits various data acquired from each ECU (ECU_A3, ECU_B4, ECU_C5) and the navigation device 9 to the external server 8. , and a second transmitting/receiving antenna for transmitting/receiving signals in the 2 GHz band. In this embodiment, the transmitting/receiving antenna 2d is used as an antenna for both transmission and reception, but it may be a dedicated antenna for transmission.

Further, in this embodiment, the transmitting/receiving antenna 2d is formed by a pattern formed on the DCM substrate 2. As shown in FIG. The transmitting/receiving antenna 2d is not limited to this. For example, a chip on which a transmitting/receiving antenna is formed may be mounted on the DCM board 2, or the transmitting/receiving antenna 2d formed on a board or module different from the DCM board 2 may be mounted. It may be attached to the DCM board 2 via a connector or the like.

The reception antenna 2e is a reception-only antenna for receiving various service information (e.g., telematics services) from the external server 8, and includes a first reception antenna for receiving signals in a carrier setting band, for example, an 800 MHz band, It consists of two receiving antennas, a second receiving antenna for receiving signals in the 2 GHz band.

The first receiving antenna forms a pair with the first transmitting/receiving antenna, and communicates signals in the 800 MHz band. Also, the second receiving antenna forms a pair with the second transmitting/receiving antenna, and performs communication of signals in the 2 GHz band.

Information received by the in-vehicle communication device (DCM board 2) from the external server 8 includes telematics services, software update data for each ECU (ECU_A3, ECU_B4, ECU_C5), updated map data for the navigation device 9, and so on. and so on.

Since the amount of data received by the DCM board 2 from the external server 8 is larger than the amount of data transmitted from the DCM board 2 to the external server 8, in this embodiment, the receiving antenna is used for both transmission and reception. It is composed of two antennas, an antenna 2d and a receiving antenna 2e dedicated to reception, and the antenna on the transmitting side is composed of one transmitting/receiving antenna 2d.

In this embodiment, the receiving antenna 2 e is formed by a pattern formed on the DCM substrate 2 . The receiving antenna 2e is not limited to this. For example, a chip on which a receiving antenna is formed or a separate substrate antenna may be mounted on the DCM substrate 2, or may be formed on a substrate or module separate from the DCM substrate 2. The receiving antenna may be attached to the DCM board 2 via a connector or the like.

The GNSS antenna 2f receives a signal from the artificial satellite 10, and the CPU 2a transmits the signal to the navigation device 9 via the transmission/reception circuit 2c and the bus 6.

The WiFi antenna 2g is, for example, an antenna for communication with a mobile terminal device such as a mobile phone.

The external server 8 provides a predetermined service (for example, telematics service) to the user based on data from the vehicle-mounted communication device (DCM board 2). Prepare. The CPU 8a generates various service information based on data from the in-vehicle communication device (DCM board 2), and controls transmission of the generated various service information to the user. The memory 8b has a ROM section for storing control programs for the CPU 8a, and a RAM section for storing data from the in-vehicle communication device (DCM board 2) and temporarily storing generated service information.

The CPU 8a processes necessary data out of various data transmitted from the in-vehicle communication device (DCM board 2) to generate service information. For example, the service information includes parking position information of the vehicle 1, fuel consumption information, information on vehicle failure, information on arrival of engine oil change time, and big data such as detection status of various sensors of the vehicle 1 used by the manufacturer. service information. Note that these pieces of information are only examples, and various service information desired by the user may be generated. Further, the CPU 8a generates service information when receiving a request signal from the in-vehicle communication device (DCM board 2), but generates it when receiving necessary data, and stores the generated service information in the memory 8b. You may make it

When the CPU 8a receives a request signal from the vehicle-mounted communication device (DCM board 2), the CPU 8a transmits the generated service information from the transmission/reception circuit 8c to the vehicle-mounted communication device (DCM board 2). Regarding the transmission timing of the service information, in addition to the case of receiving a request signal from the vehicle-mounted communication device (DCM board 2), for example, it may be periodically transmitted to the vehicle-mounted communication device (DCM board 2). .

A WiFi antenna 2g for WiFi communication is also patterned on the DCM board 2, enabling communication with a mobile terminal device such as a mobile phone.

As shown in FIG. 2, the transmitting/receiving antenna 2d is formed in a first area 21a including one corner near one long side 20a of the oblong rectangular main surface 20 of the DCM board 2. As shown in FIG.

The receiving antenna 2e is located in the vicinity of another long side 20b opposite to the long side 20a of the oblong rectangular main surface 20 of the DCM substrate 2, and is positioned diagonally from the corner in the first region 21a. It is formed in the second region 21b including the corners that overlap. That is, the second area 21b is located diagonally to the first area 21a, and the receiving antenna 2e is formed on the main surface 20 of the DCM substrate 2 at the position farthest from the transmitting/receiving antenna 2d. This makes it possible to suppress mutual interference between transmission signals and reception signals in the same communication frequency band.

The GNSS antenna 2f is formed in a third region 21c adjacent to the first region 21a in the vicinity of one long side 20a of the oblong rectangular main surface 20 of the DCM substrate 2 .

The WiFi antenna 2g is formed in a fourth region 21d near the long side 20b of the main surface 20 of the DCM substrate 2 having a rectangular shape and adjacent to the second region 21b where the receiving antenna 2e is formed. .

The DCM board 2 is, for example, housed inside a housing and arranged on the back side of the instrument panel (vehicle front side with respect to the instrument panel). For example, it is arranged on the back side (vehicle front side) where the meter is arranged and above the pp member (pillar to pillar member). Note that the DCM board 2 may be placed next to the navigation device 9 (or next to the DA if a display audio (DA) is provided instead of the navigation device 9).

3, the DCM board 2 is arranged such that the main surface 20 is substantially parallel to a plane including the longitudinal direction and the vertical direction of the vehicle. In other words, the DCM board 2 is arranged such that the main surface 20 is substantially parallel to a plane having the width direction of the vehicle 1 as a vertical line. Of the antennas 2d to 2g, only the transmitting/receiving antenna 2d and the receiving antenna 2e are shown in FIG. 3, and the other antennas 2f and 2g are omitted.

In this embodiment, the long sides 20 a and 20 b of the DCM board 2 are substantially parallel to the vertical direction of the vehicle 1 , and the short sides are parallel to the longitudinal direction of the vehicle 1 . Further, the transmitting/receiving antenna 2d is arranged so as to be located on the front window 12 side of the vehicle 1 and above the receiving antenna 2e and the WiFi antenna 2g.

Further, as shown in FIG. 3, the transmitting/receiving antenna 2d is arranged inside the range D1 of the front window 12 when viewed from above the vehicle. In this way, the transmission radio wave (transmission signal) transmitted from the transmitting/receiving antenna 2d is less likely to be shielded by the metal parts of the vehicle body, and can be efficiently transmitted through the front window 12. FIG. It should be noted that the transmitting/receiving antenna 2d does not necessarily have to be arranged entirely within the range D1 of the front window 12 when viewed from above the vehicle, and at least a part thereof may be arranged within the range D1. .

Further, the transmitting/receiving antenna 2d does not necessarily have to be positioned on the front window 12 side of the vehicle 1 and above the receiving antenna 2e. It suffices if they are arranged on either one side. That is, in the configuration in which the DCM board 2 is arranged on the lower side of the front window 12, the DCM board 2 is placed in a place where the transmitting radio waves are not blocked by the metal parts of the vehicle body as much as possible while separating the transmitting/receiving antenna 2d and the receiving antenna 2e. In addition, the transmitting/receiving antenna 2d may be arranged in a predetermined area in the substrate 2. FIG. In addition, regarding the direction in which the DCM board 2 is fixed to the vehicle 1, it is not necessarily arranged so that the main surface 20 is substantially parallel to a plane having a perpendicular line extending in the width direction of the vehicle 1. The surface (main surface 20, etc.) may be fixed with a slight inclination from the horizontal plane. That is, the direction in which the DCM board 2 is fixed to the vehicle 1 can be appropriately changed if the positional relationship between the transmitting/receiving antenna 2d and the receiving antenna 2e is ensured.

By the way, when the transmitting/receiving antenna 2d is placed on the upper side or on the side of the front window 12, the transmitting performance is improved, but the receiving antenna 2e is placed closer to the vehicle interior than the transmitting/receiving antenna 2d, and the receiving performance is deteriorated. There is a risk of That is, when the receiving antenna 2e is arranged below the transmitting/receiving antenna 2d or at a position away from the front window 12, the signal (received signal: received radio wave) from the external server 8 is blocked by the metal part of the vehicle body. It is conceivable that the power of the radio wave becomes weaker and the reception performance deteriorates. However, according to the experiments of the inventors, the received radio waves are reflected in the vehicle interior more than the reception sensitivity (X [dBi]: FIG. 7) of the reception antenna 2e when the received radio waves are not reflected by the reflecting object (metal) in the vehicle interior. It was found that the receiving sensitivity (Y [dBi]: FIG. 7) of the receiving antenna 2e when reflected by an object (metal) is higher (see FIG. 7). In other words, it has been found that even if the receiving antenna 2e is placed closer to the passenger compartment than the transmitting/receiving antenna 2d, the reception performance can be ensured by reflecting the received radio waves from the structure (made of metal) of the vehicle body. This is because the signal (received signal) from the external server 8 has higher power than the signal (transmitted signal) transmitted from inside the vehicle. If the reflected wave (reflected signal) reflected by the skeleton (made of metal) of the antenna can be received, it is considered that the receiving performance can be ensured even when the receiving antenna 2e is arranged inside the vehicle compartment.

Therefore, according to the above-described embodiment, the transmitting/receiving antenna 2d and the receiving antenna 2e are arranged separately in different areas (the first area 21a and the second area 21b) on the DCM substrate 2. Mutual interference with received radio waves can be suppressed. In addition, since the transmitting/receiving antenna 2d is arranged above the receiving antenna 2e and closer to the front window 12, even if the power of the transmission signal transmitted from the transmitting/receiving antenna 2d is small, the metal portion forming the vehicle frame can be used. Efficient transmission of radio waves (transmitting radio waves) from inside the vehicle to outside the vehicle without being disturbed by

Further, in this embodiment, the receiving antenna 2e is placed closer to the interior of the vehicle than the transmitting/receiving antenna 2d. It was found that even a reflected wave (reflected wave of a received radio wave coming from the outside of the vehicle) reflected by a structure (made of metal) of the vehicle body frame can be received by the receiving antenna 2e. Therefore, even if the receiving antenna 2e is arranged apart from the front window 12, the reception performance of the received radio waves can be ensured.

In addition, since the transmitting/receiving antenna 2d is arranged within the range D1 overlapping the front window 12 when viewed from the direction perpendicular to the horizontal plane, the transmitting radio wave can be efficiently transmitted through the front window 12. can be done.

(Modified example of formation area of each antenna)
The arrangement of the antennas 2d to 2g formed on the DCM substrate 2 can be changed as appropriate. For example, as shown in FIG. 4, the transmitting/receiving antenna 2d and the GNSS antenna 2f are formed in the same area as shown in FIG. be.

On the other hand, the receiving antenna 2e is located in the vicinity of another long side 20b opposite to the long side 20a of the oblong rectangular main surface 20 of the DCM substrate 2, and is located on one short side 20c near the first region 21a. It is formed in the fifth region 21e including the corner on the side. That is, the fifth area 21e where the receiving antenna 2e is formed is closer to the transmitting/receiving antenna 2d (first area 21a) than the second area 21b (see FIG. 2) shown in FIG. 2d is formed in a separate region. Even in this way, it is possible to suppress mutual interference between transmission signals and reception signals in the same communication frequency band.

Further, the WiFi antenna 2g is formed in a sixth region 21f adjacent to the fifth region 20e, which is the forming region of the receiving antenna 2e, near the long side 20b of the main surface 20 of the oblong rectangular shape of the DCM substrate 2. ing.

(Modified example of positional relationship between transmitting/receiving antenna and receiving antenna)
The arrangement of the transmitting/receiving antenna 2d and the receiving antenna 2e can be changed as appropriate. For example, as shown in FIG. 5, the transmitting/receiving antenna 2d is arranged near the upper short side of the main surface 20 of the oblong rectangular shape of the DCM board 2, and the receiving antenna 2e is arranged near the lower short side. You may arrange it. Also in this case, the transmitting/receiving antenna 2d is preferably arranged within the range D1 of the front window 12 when viewed from above the vehicle. In FIG. 5, among the antennas 2d to 2g, only the transmitting/receiving antenna 2d and the receiving antenna 2e are illustrated, and the other antennas 2f and 2g are omitted.

Even in this way, the transmitting/receiving antenna 2d and the receiving antenna 2e can be spaced apart from each other. In addition, by arranging the transmitting/receiving antenna 2d closer to the short side on the upper side, it becomes closer to the front window 12, and transmission signals are not blocked by the metal parts of the vehicle body, and can be efficiently transmitted through the front window 12. It can be sent to the server 8).

(Antenna placement when the DCM board is placed behind the vehicle)
Although the DCM board 2 is arranged on the front side of the vehicle in the above embodiment, it may be arranged on the rear side of the vehicle. In this case, the DCM board 2 is arranged on the rear side of the vehicle 1, and is arranged such that the main surface 20 is substantially parallel to a plane having a vertical line in the width direction of the vehicle. Also in FIG. 6, among the antennas 2d to 2g, only the transmitting/receiving antenna 2d and the receiving antenna 2e are illustrated, and the other antennas 2f and 2g are omitted.

Further, the DCM board 2 is arranged such that the long sides 20 a and 20 b are substantially parallel to the vertical direction of the vehicle 1 and the short sides are parallel to the longitudinal direction of the vehicle 1 . Further, the transmitting/receiving antenna 2d is arranged so as to be located on the rear window 13 side of the vehicle 1 and above the receiving antenna 2e.

Further, as shown in FIG. 6, the transmitting/receiving antenna 2d is arranged inside the range D2 of the rear window 13 when viewed from above the vehicle. In this way, the transmission radio wave (transmission signal) transmitted from the transmitting/receiving antenna 2d is less likely to be blocked by the metal portion of the vehicle body, and can be efficiently transmitted through the rear window 13. FIG. It should be noted that the transmitting/receiving antenna 2d does not necessarily have to be arranged entirely within the range D2 of the rear window 13 when viewed from above the vehicle, and at least a part of it may be arranged within the range D2. .

Further, the transmitting/receiving antenna 2d does not necessarily have to be positioned on the rear window 13 side of the vehicle 1 and above the receiving antenna 2e. It suffices if they are arranged on either one side.

According to this configuration, mutual interference between the received signal and the transmitted signal can be suppressed by arranging the transmitting/receiving antenna 2d and the receiving antenna 2e apart from each other, as in the above-described embodiment. Further, radio waves (transmitting radio waves) from inside the vehicle to outside the vehicle can be efficiently transmitted from the transmission/reception antenna 2d without being obstructed by the metal parts forming the frame of the vehicle 1 .

The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present invention.

For example, in the above-described embodiment, a case has been described where communication is performed by forming pairs of transmitting antennas and receiving antennas in each of two frequency bands (800 MHz band and 2 GHz band). Communication may be performed using more frequency bands.

Further, in the above-described embodiment, the case where one antenna (the transmitting/receiving antenna 2d) is used as both a transmitting antenna and a receiving antenna has been described, but separate antennas may be used for each. In this case, the receiving side may be composed of only the receiving antenna 2e, or may be composed of one transmitting-only antenna and two receiving-only antennas.

Moreover, the present invention can be applied not only to communication with the external server 8, but also to an in-vehicle communication device used for communication with various external devices such as other vehicles.

Further, in the above-described embodiment, the case where the vehicle 1 is equipped with the navigation device 9 has been described, but a display audio may be used instead.

Moreover, the above-described embodiments can be applied not only to gasoline vehicles but also to electric vehicles, hybrid vehicles, and self-driving vehicles.

2: DCM board (board, in-vehicle communication device)
2d: Transceiving antenna (communication antenna, first antenna)
2e: Receiving antenna (communication antenna, second antenna)
2f: GNSS antenna (communication antenna)
2g: WiFi antenna (communication antenna)
8: External server (external device)
12: Front window (vehicle window)
13: Rear window (vehicle window)

Claims (3)

An in-vehicle communication device in which a communication antenna for communicating with an external device is provided on a board,
The communication antenna includes a first antenna having a transmitting function and a second antenna having a receiving function,
The first antenna and the second antenna are arranged separately in different regions on the substrate,
The vehicle-mounted communication device, wherein the substrate is arranged in a vehicle interior with the first antenna disposed above and/or on the vehicle window side of the second antenna. 2. The in-vehicle communication device according to claim 1, wherein the second antenna is arranged closer to the interior of the vehicle than the first antenna. 3. The in-vehicle communication device according to claim 1, wherein the first antenna is arranged in a range at least partially overlapping with the vehicle window when viewed from a direction perpendicular to a horizontal plane. .

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