JP7118556B2 - antenna device - Google Patents

Description

The present invention relates to an antenna device provided with multiple antennas.

2. Description of the Related Art Conventionally, there has been known a module in which four antenna elements are arranged on one substrate for communication by a 4×4 MIMO (Multiple-Input Multiple-Output) system (see, for example, Patent Document 1). This module has four transmitting antenna elements 4a-4d and four receiving antenna elements 5a-5d, each transmitting antenna element 4a-4d using a dipole antenna.

JP 2018-129623 A

By the way, in the module disclosed in the above-mentioned Patent Document 1, for example, conductors (elements) constituting three transmitting antenna elements 4a to 4c are arranged along one side of the substrate so as to be parallel to each other. There is a problem that when the size is reduced or the transmission output of radio waves is increased, radio wave interference may occur between the antenna elements, and the communication performance may be degraded.

SUMMARY OF THE INVENTION The present invention was created in view of the above points, and its object is to provide an antenna device capable of suppressing radio wave interference between a plurality of antennas and improving communication performance. It is in.

In order to solve the above-described problems, the antenna device of the present invention includes a first region, a second region located behind the first region, a third region located to the right of the second region, a third Antenna arrangement region having a fourth region located on the front side of the region and on the right side of the first region, a first antenna extending in the horizontal direction in the first region and emitting radio waves, and a front and rear antenna in the second region A second antenna extending in a direction to radiate radio waves, a third antenna extending in a horizontal direction in a third area to radiate radio waves, and a fourth area in a longitudinal direction to radiate radio waves. and a fourth antenna. The first to fourth antennas have a common first operating frequency band, and the first antenna is arranged in front of the center of the fourth antenna along the front-rear direction. The second antenna is arranged on the left side along the left-right direction of the center of the first antenna along the left-right direction. The third antenna is arranged rearward in the front-rear direction from the center of the second antenna in the front-rear direction. The fourth antenna is arranged on the right side along the left-right direction of the center of the third antenna along the left-right direction.

By arranging the four antennas in this way, it is possible to prevent the radiation direction of each antenna from overlapping with the other antennas. It is possible to improve the communication performance when performing communication using the .

Further, a fifth antenna and a sixth antenna having a second operating frequency band different from the first operating frequency band described above are further provided, and the fifth antenna is arranged at one end of the first side of the outer circumference of the antenna arrangement area. and the sixth antenna is arranged at the other end of the first side. As a result, when two antennas (fifth and sixth antennas) are added to four antennas (first to fourth antennas), these two antennas can be spaced apart, and these two antennas It is possible to suppress the radio wave interference between the two antennas and improve the communication performance when performing communication using these two antennas.

Further, the seventh antenna having the second operating frequency band described above is further provided, and the seventh antenna is arranged along the second side facing the first side and being the outer periphery of the antenna arrangement area. is desirable. As a result, the two antennas (the fifth antenna, the sixth antenna) and the seventh antenna can be placed apart, and radio wave interference between these antennas is suppressed, and communication is performed using these antennas. communication performance can be improved.

Moreover, it is desirable that the above-described seventh antenna be arranged at an intermediate position of the second side. As a result, the seventh antenna can be separated from both the fifth antenna and the sixth antenna, thereby suppressing radio wave interference between the seventh antenna and the fifth antenna, and suppressing radio wave interference between the seventh antenna and the sixth antenna. Interference can be suppressed.

The antenna is further provided with a seventh antenna and an eighth antenna, the seventh antenna being arranged at one end of a second side facing the first side on the outer periphery of the antenna arrangement area, and the eighth antenna being arranged at the second side. It is desirable that it be arranged at the other end of the two sides. As a result, the two antennas (the fifth antenna, the sixth antenna) and the seventh antenna, the eighth antenna can be arranged separately, and the radio wave interference between these antennas can be suppressed. It is possible to improve communication performance when performing communication.

Further, a first monopole antenna extending in a direction perpendicular to the above-mentioned antenna arrangement area and arranged within the antenna arrangement area at a position equidistant from each of the fifth antenna and the sixth antenna is further provided. is desirable. By arranging the first monopole antenna away from both the fifth and sixth antennas in this way, radio wave interference between the fifth and sixth antennas and the first monopole antenna can be suppressed. can.

Moreover, it is desirable that the above-described antenna placement area has a rectangular shape with a pair of long sides and a pair of short sides, and the first side is one of the pair of long sides. By arranging the fifth antenna and the sixth antenna apart from each other on both ends of the long side in this way, radio wave interference between the fifth antenna and the sixth antenna can be suppressed.

Further, the above-described antenna arrangement area has a rectangular shape with a pair of long sides and a pair of short sides, and is arranged at a position at a predetermined distance in the clockwise direction from the end along the long side or the short side. It is desirable to further include a second monopole antenna for receiving the circularly polarized signal. With such an arrangement, the second monopole antenna can efficiently receive the right-handed circularly polarized wave signal.

Moreover, it is desirable that the second monopole antenna described above be arranged along the long side. By arranging the second monopole antenna at a predetermined distance from the end of the long side in this way, the signal reception efficiency can be further increased compared to the case of arranging it along the short side.

Moreover, it is preferable that the first antenna, the second antenna, the third antenna, and the fourth antenna described above are monopole antennas.

Moreover, it is preferable that the first antenna, the second antenna, the third antenna, and the fourth antenna described above are used as antenna elements of a 4×4 MIMO system for wireless WAN.

Moreover, it is desirable that the first operating frequency band described above includes a plurality of frequency band groups having different frequencies, and that separate antenna elements correspond to the respective frequency band groups.

Moreover, it is desirable that the fifth and sixth antennas described above are used as antenna elements of the 2×2 MIMO system for wireless LAN.

Moreover, it is desirable that the seventh antenna described above be used as an antenna element for BLE (Bluetooth Low Energy).

Also, the second monopole antenna described above is desirably used as an antenna element of a GNSS (Global Navigation Satellite System).

Moreover, it is desirable that the first monopole antenna described above be used as an antenna element for V2X (vehicle to X).

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the outline|summary of the electronic device of 1st Embodiment. It is a top view which shows the outline|summary of the electronic device of 2nd Embodiment. It is a top view which shows the outline|summary of the electronic device of 3rd Embodiment. It is a top view which shows the outline|summary of the electronic device of a modification. FIG. 11 is a plan view showing an outline of an electronic device of another modified example; FIG. 11 is a plan view showing an outline of an electronic device of another modified example; FIG. 11 is a plan view showing an outline of an electronic device of another modified example;

An electronic device according to an embodiment to which the antenna device of the present invention is applied will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a plan view showing the outline of the electronic device of the first embodiment. This electronic device is assumed to be miniaturized and mounted on a vehicle, for example, but it may be used indoors and outdoors other than a vehicle. This point is the same for other embodiments.

The electronic device 100 of this embodiment includes a substrate 110 , four antennas 120 , 122 , 124 and 126 and a communication circuit 150 .

The substrate 110 has, for example, a rectangular shape, and a wiring layer and a ground layer for connecting components are formed on or inside a dielectric layer. The substrate 110 has an antenna arrangement area 112 in which a horizontally long rectangular shape is divided into 2 rows and 2 columns. As shown in FIG. 1, the entire substrate 110 corresponds to the antenna placement area 112 .

In this antenna arrangement area 112, the lower left quarter (the third quadrant when the line that bisects the antenna arrangement area 112 vertically and horizontally is the X axis and the line that bisects the antenna arrangement area 112 horizontally is the Y axis) is provided. 1 area 112A, upper left quarter (second quadrant) second area 112B, upper right quarter (first quadrant) third area 112C, and lower right quarter (fourth quadrant) and a fourth region 112D.

The four antennas 120, 122, 124, and 126 are antenna elements for communicating in a wireless WAN (Wide Area Network) using a 4×4 MIMO (Multiple-Input Multiple-Output) method, and share the same frequency. Radio waves are transmitted and received using the band as an operating frequency band (first operating frequency band).

Antenna 120 (first antenna) is a monopole antenna extending in the horizontal direction in first region 112A, and radiates radio waves in a direction perpendicular to the extending direction. Although FIG. 1 shows a radio wave radiation pattern 120a of the antenna 120, radio waves are actually radiated in a donut shape by rotating the radiation pattern 120a about the longitudinal direction of the antenna 120 as a rotation axis.

It is assumed that a common antenna element is used for transmitting and receiving radio waves, but the transmitting antenna element and the receiving antenna element may be arranged close to each other. The operating frequency band of each antenna includes the following three frequency bands LB, MB, and HB.
・LB: 619-960MHz
・MB: 1427.9 to 2690MHz
・HB: 3300-5000MHz
Since these three frequency bands are wide, antenna 120 may be configured with two or three antenna elements. As a result, it is possible to use an antenna element having a shape that improves the transmission/reception efficiency of radio waves for each of the three frequency bands. These variations are the same for the other antennas 122, 124, 126 as well.

Similarly, the antenna 122 (second antenna) is a monopole antenna that extends in the front-rear direction (vertical direction in FIG. 1) in the second region 112B, and transmits radio waves in a direction perpendicular to the extension direction. radiate. Although FIG. 1 shows the radio wave radiation pattern 122a of the antenna 122, the radio waves are actually radiated in a donut shape by rotating the radiation pattern 122a about the longitudinal direction of the antenna 122 as the axis of rotation.

The antenna 124 (third antenna) is a monopole antenna extending in the horizontal direction in the third region 112C, and radiates radio waves in a direction perpendicular to the extending direction. FIG. 1 shows the radiation pattern 124a of the radio waves of the antenna 124. Actually, the radiation pattern 124a is rotated about the longitudinal direction of the antenna 124 as the axis of rotation, and the radio waves are radiated in a donut shape.

Antenna 126 (fourth antenna) is a monopole antenna extending in the front-rear direction (vertical direction in FIG. 1) in fourth region 112D, and radiates radio waves in a direction perpendicular to the extending direction. . Although FIG. 1 shows the radio wave radiation pattern 126a of the antenna 126, the radio waves are actually radiated in a donut shape by rotating the radiation pattern 126a about the longitudinal direction of the antenna 126 as the axis of rotation.

The above-described antenna 120 is located forward (lower in FIG. 1) than the center of the antenna 126 along the front-rear direction (this position is indicated by the center line 126b) and the edge of the substrate 110 (lower side of the rectangular shape). ) are located along the

Further, the antenna 122 is arranged at a position on the left side of the center of the antenna 120 along the horizontal direction (this position is indicated by the center line 122b) and along the edge of the substrate 110 (the left side of the rectangular shape). It is

Antenna 124 is positioned behind the center of antenna 122 in the longitudinal direction (this position is indicated by center line 122b) (upper side in FIG. 1) and at the edge of substrate 110 (the upper side of the rectangular shape). placed along the line.

Antenna 126 is arranged on the right side of the center of antenna 124 in the horizontal direction (this position is indicated by center line 124b) and along the edge of substrate 110 (the right side of the rectangular shape). there is

Communication circuit 150 also performs signal transmission processing and signal reception processing via antennas 120, 122, 124, and 126, respectively. In FIG. 1, the communication circuit 150 is arranged substantially in the center of the substrate 110, but the communication circuit 150 may be arranged at a position other than this.

As described above, in the electronic device 100 of the present embodiment, the four antennas 120, 122, 124, and 126 are arranged so that their positions are shifted from the center lines of the radiation patterns of the adjacent antennas. Since the radiation direction can be prevented from overlapping with other antennas, radio wave interference between these four antennas 120, 122, 124, and 126 is suppressed, and these four antennas 120, 122, 124, and 126 are used. It is possible to improve the communication performance when performing communication by

(Second embodiment)
FIG. 2 is a plan view showing the outline of the electronic device of the second embodiment. The electronic device 200 of this embodiment differs from the electronic device 100 shown in FIG. 1 in that three antennas 130, 132, and 134 are added. The following description focuses on these added antennas 130 , 132 , and 134 .

The two antennas 130 and 132 are antenna elements (elements) for communicating in a wireless LAN (Local Area Network) by a 2×2 MIMO method, and use the same common frequency band as an operating frequency band (first operating frequency band). radio waves are transmitted and received as a second operating frequency band). This operating frequency band includes two frequency bands, 2400-2480 MHz and 5150-5850 MHz.

Further, the antenna 134 is an antenna element for performing BLE (Bluetooth (registered trademark) Low Energy) communication. The operating frequency band of this BLE is 2400-2480 MHz, which overlaps with one of the two frequency bands of the wireless LAN mentioned above.

Antenna 130 (fifth antenna) is a monopole antenna arranged at one end (left end) of the upper side (first side) of the outer circumference of antenna placement area 112 having a rectangular shape and extending along this upper side. It is there and emits radio waves in a direction perpendicular to its extension direction. Although FIG. 2 shows the radio wave radiation pattern 130a of the antenna 130, the radio waves are actually radiated in a donut shape by rotating the radiation pattern 130a about the longitudinal direction of the antenna 130 as the rotation axis.

Further, the antenna 132 (sixth antenna) is arranged at the other end (right end) of the upper side (first side) of the outer circumference of the antenna placement area 112 having a rectangular shape, and the monopole extending along this upper side. An antenna that emits radio waves in a direction perpendicular to its extension direction. Although FIG. 2 shows the radio wave radiation pattern 132a of the antenna 132, the radio waves are actually radiated in a doughnut-like shape by rotating the radiation pattern 132a about the longitudinal direction of the antenna 132 as the axis of rotation.

Antenna 134 (seventh antenna) is located in the periphery of antenna placement area 112 having a rectangular shape and is located at an intermediate position (preferably at the center position, but not at the center) of the lower side (second side) opposite to the upper side (first side). It is a monopole antenna that is arranged along the lower side of the monopole antenna and radiates radio waves in a direction perpendicular to the extending direction. Although FIG. 2 shows the radio wave radiation pattern 134a of the antenna 134, the radio waves are actually radiated in a donut shape by rotating the radiation pattern 134a about the longitudinal direction of the antenna 134 as the rotation axis.

The transmission processing and reception processing of signals via these antennas 130, 132, and 134 may be performed by the communication circuit 150, but may be performed by another communication circuit (not shown). good too.

Thus, in the electronic device 200 of the present embodiment, in addition to the four antennas 120 to 126 for wireless WAN, two antennas 130 and 132 for wireless LAN are arranged at both ends of the upper side (long side) of the antenna arrangement area 112. The two antennas 130 and 132 are placed apart from each other, so that radio wave interference between the two antennas 130 and 132 can be suppressed, and communication performance can be improved when the two antennas 130 and 132 are used for communication.

In addition, by arranging a BLE antenna 134 together with these two antennas 130 and 132 along the lower side of the antenna arrangement area 112, radio wave interference between the antennas 130 and 132 and the antenna 134 whose operating frequency bands overlap each other is reduced. can be suppressed, and communication performance can be improved when performing communication using these antennas. In particular, by arranging the antenna 134 at the middle position of the lower side, the antenna 134 can be separated from both the antennas 130 and 132, suppressing radio wave interference between the antenna 134 and the antenna 130, and It is possible to suppress radio wave interference between

(Third embodiment)
FIG. 3 is a plan view showing the outline of the electronic device of the third embodiment. The electronic device 300 of this embodiment differs from the electronic device 200 shown in FIG. 2 in that two types of monopole antennas 140 and 142 are added. The following description focuses on these added antennas 140 and 142 .

One monopole antenna 140 (first monopole antenna) is an antenna element for V2X (vehicle to X). The operating frequency band of this antenna 140 is 5850 to 5950 MHz, and is extended vertically with respect to the front surface (or back surface) of the antenna arrangement area 112 so as to enable optimal transmission and reception of radio waves for vertical polarized waves. is set.

In addition, the monopole antenna 140 is arranged within the antenna arrangement area 112 and equidistant from these antennas 130 and 132, for example, in order to avoid interference with the wireless LAN antennas 130 and 132. .

Placing monopole antenna 140 equidistantly from each of antennas 130 and 132 in this manner allows for the separation of antennas 130 and 132 and monopole antenna 140, which have portions of their operating frequency bands that are close together. It is possible to suppress radio wave interference between

The other monopole antenna 142 (second monopole antenna) is a GNSS (Global Navigation Satellite System) antenna element. GNSS uses a right-handed circularly polarized signal, and in order to efficiently receive this signal, from the end (left end) along one long side of the rectangular antenna arrangement area 112, They are arranged at predetermined distances in the clockwise direction. This predetermined distance is determined according to the frequency of the received radio waves. For example, it is assumed that radio waves of 1559 to 1610 MHz are received, and in this case, this predetermined distance is set to about 28 to 30 mm from the left end. It is also possible to slide to the position where the reception performance is optimal, depending on the shape and size of the product, the arrangement of peripheral parts, and the like.

The antenna 142 may be placed at a predetermined distance in the clockwise direction from the edge along the short side of the outer circumference of the antenna placement area 112, although the reception efficiency is slightly reduced.

Further, the transmission processing and reception processing of signals via these monopole antennas 140 and 142 may be performed by the communication circuit 150, but may be performed by another communication circuit (not shown). good too.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, in the second embodiment described above, the electronic device 200 including both the wireless LAN antennas 130 and 132 and the BLE antenna 134 was described, but only the wireless LAN antennas 130 and 132 are provided. The present invention can also be applied in cases where only the antenna 134 for BLE is provided.

In the above-described third embodiment, the electronic device 300 including the wireless LAN antennas 130 and 132, the BLE antenna 134, the V2X monopole antenna 140, and the GNSS monopole antenna 142 is described. However, the present invention can be applied even when some of these antennas are provided.

In addition, in the above-described second embodiment, the BLE antenna 134 is arranged at the middle position of the lower side of the antenna arrangement area 112, but as shown in FIG. 4, it may be arranged at the end of the lower side. . In addition, in the above-described second embodiment, the extending directions of the wireless LAN antennas 130 and 132 are along the upper side, but they may be deviated from the extending directions along the upper side. In the example shown in FIG. 5, the directions in which the antennas 130 and 132 extend are set so that the center line of the radio wave radiation pattern is directed toward the vicinity of the central position of the antenna arrangement area 112 . These modifications are the same for the third embodiment.

In addition, in the above-described second embodiment, a case has been described in which two antennas 130 and 132 for wireless LAN and one antenna 134 for BLE are added to the configuration shown in FIG. , 132, and 134, an additional antenna 136 may be added. In this case, as shown in FIG. 6, antennas 134 and 136 are arranged at both ends of the lower side of the antenna arrangement area 112, or as shown in FIG. A modified example of changing the direction in which the extends is conceivable. These modifications are the same for the third embodiment.

As described above, according to the present invention, by arranging four antennas at predetermined positions in four areas of the antenna arrangement area, it is possible to prevent the radiation direction of each antenna from overlapping with another antenna. Therefore, it is possible to suppress radio wave interference between these four antennas and improve communication performance when performing communication using these four antennas.

100, 200, 300 electronic device 110 substrate 112 antenna arrangement area 120, 122, 124, 126, 130, 132, 134 antenna 140, 142 monopole antenna 150 communication circuit

Claims (15)

A first region, a second region located behind the first region, a third region located to the right of the second region, and a front side of the third region and to the right of the first region. an antenna placement region having a fourth region located;
a first antenna extending in the horizontal direction in the first region and radiating radio waves;
a second antenna extending in the front-rear direction in the second region and radiating radio waves;
a third antenna extending in the horizontal direction in the third region and radiating radio waves;
a fourth antenna extending in the front-rear direction in the fourth region and radiating radio waves;
a fifth antenna and a sixth antenna;
wherein the first to fourth antennas have a common first operating frequency band;
the fifth antenna and the sixth antenna have a second operating frequency band different from the first operating frequency band;
The first antenna is arranged in front of the center of the fourth antenna along the front-rear direction in the front-rear direction,
The second antenna is arranged on the left side along the left-right direction of the center of the first antenna along the left-right direction,
the third antenna is arranged rearward along the front-rear direction from the center of the second antenna along the front-rear direction;
The fourth antenna is arranged on the right side along the left-right direction of the center of the third antenna along the left-right direction ,
The fifth antenna is arranged at one end of a first side of the outer circumference of the antenna arrangement area,
The antenna device , wherein the sixth antenna is arranged at the other end of the first side . further comprising a seventh antenna having the second operating frequency band;
2. The antenna device according to claim 1 , wherein the seventh antenna is arranged along a second side facing the first side and which is an outer circumference of the antenna arrangement area. 3. The antenna device according to claim 2 , wherein the seventh antenna is arranged at an intermediate position of the second side. further comprising a seventh antenna and an eighth antenna;
The seventh antenna is arranged at one end of a second side facing the first side and on the outer periphery of the antenna arrangement area,
2. The antenna device according to claim 1 , wherein said eighth antenna is arranged at the other end of said second side. Further comprising a first monopole antenna extending in a direction perpendicular to the antenna arrangement area and arranged in the antenna arrangement area at a position equidistant from each of the fifth antenna and the sixth antenna. The antenna device according to any one of claims 1 to 4 , characterized in that: The antenna arrangement area has a rectangular shape consisting of a pair of long sides and a pair of short sides,
6. The antenna device according to claim 1 , wherein the first side is one of the pair of long sides. The antenna arrangement area has a rectangular shape consisting of a pair of long sides and a pair of short sides,
1. Further comprising a second monopole antenna arranged at a predetermined distance in the clockwise direction from the end along the long side or the short side for receiving a right-handed circularly polarized signal. 6. The antenna device according to any one of 5 . 8. The antenna device according to claim 7 , wherein said second monopole antenna is arranged along said long side. The antenna device according to any one of claims 1 to 8 , wherein the first antenna, the second antenna, the third antenna, and the fourth antenna are monopole antennas. The first antenna, the second antenna, the third antenna, and the fourth antenna are used as antenna elements of a wireless WAN 4 × 4 MIMO system. An antenna device as described. The first operating frequency band of claims 1 to 10 , wherein a plurality of frequency band groups with mutually different frequencies are included, and separate antenna elements correspond to each frequency band group. An antenna device according to any one of the preceding claims. 5. The antenna device according to claim 1 , wherein the fifth antenna and the sixth antenna are used as antenna elements of a 2×2 MIMO system for wireless LAN. 4. The antenna device according to claim 2 , wherein the seventh antenna is used as a BLE (Bluetooth Low Energy) antenna element. 6. The antenna device according to claim 5 , wherein the second monopole antenna is used as an antenna element of GNSS (Global Navigation Satellite System). 9. The antenna device according to claim 7 , wherein the first monopole antenna is used as an antenna element for V2X (vehicle to X).

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