Antenna device

Abstract

To provide an antenna device with a gain increased.SOLUTION: An antenna device 100 includes a first dielectric substrate 110 having a first surface 111, a second dielectric substrate 120 facing the first dielectric substrate 110, a plurality of first radiation elements 131 provided on the first surface 111, a power supply unit 135H that supplies current to the first radiation elements 131, a plurality of second radiation elements 140 provided on a second surface 121 of the second dielectric substrate 120 and bonded to the first radiation elements 131, and a penetration hole formed around the second radiation elements 140 of the second dielectric substrate 120 in a plan view. The first radiation elements 131 are a plurality of antenna elements for a patch antenna.SELECTED DRAWING: Figure 1B

Description

[Technical field]

[0001] The present disclosure relates to an antenna device. [Background technology]

[0002] Conventionally, there has been a microstrip antenna including a ground conductor, a parasitic conductor spaced apart from the ground conductor, a powered conductor disposed between the ground conductor and the parasitic conductor and configured to apply a predetermined voltage between the ground conductor, and a wall-like member made of a dielectric material disposed around an inter-conductor space connecting and partitioning an edge of the parasitic conductor and an edge of the powered conductor. The ground conductor and the powered conductor are provided on a first dielectric substrate, and the parasitic conductor is provided on a second dielectric substrate, and a plurality of the powered conductors and the parasitic conductors are provided in a plan view and arranged in an array (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-138525 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a conventional microstrip antenna (antenna device), one powered conductor and one parasitic conductor overlap each other vertically to form one antenna, and a plurality of antennas are arranged in an array.

[0005] Incidentally, in a conventional microstrip antenna (antenna device), the second dielectric substrate is a flat dielectric substrate without holes, so that mutual coupling between the multiple antennas is large, resulting in a decrease in the gain of the antenna device.

[0006] It is therefore an object of the present invention to provide an antenna device with increased gain. [Means for solving the problem]

[0007] An antenna device according to an embodiment of the present disclosure includes a first dielectric substrate having a first surface, a second dielectric substrate opposite the first dielectric substrate, a plurality of first radiating elements provided on the first surface, a power feeding section for feeding power to the first radiating elements, a plurality of second radiating elements provided on a second surface of the second dielectric substrate and coupled to the plurality of first radiating elements, and through holes formed around the plurality of second radiating elements of the second dielectric substrate in a planar view, and the plurality of first radiating elements are a plurality of antenna elements for a patch antenna. Effect of the Invention

[0008] It is possible to provide an antenna device with increased gain. [Brief description of the drawings]

[0009] [Figure 1A] 1 is a diagram illustrating an example of a configuration of an antenna device 100 according to an embodiment. [Figure 1B] 1B is a diagram showing an example of the configuration of a cross section taken along the line A1-A1 of FIG. 1A. [Figure 1C] 1B is a diagram showing an example of the configuration of a cross section taken along the line A2-A2 of FIG. 1A. [Figure 2A] 2 is a diagram showing an example of the planar configuration of a substrate 110 and a patch antenna 130. FIG. [Figure 2B] 2 is a diagram showing an example of the configuration of a plurality of second antenna elements 140. FIG. [Figure 2C] 2 is a diagram showing an example of the configuration of a substrate 120. FIG. [Figure 3A] 13A and 13B are diagrams illustrating simulation results of a comparative antenna device. [Figure 3B] 5A to 5C are diagrams illustrating simulation results of the antenna device 100 according to the embodiment. [Figure 4] FIG. 2 is a diagram illustrating an example of a configuration of an antenna device 100A according to a first modified example of the embodiment. [Figure 5A] 13 is a diagram illustrating an example of a configuration of a portion of an antenna device according to a second modified example of the embodiment. FIG. [Figure 5B] 13 is a diagram illustrating an example of a configuration of a portion of an antenna device according to a second modified example of the embodiment. FIG. [Figure 5C] 13 is a diagram illustrating an example of a configuration of a portion of an antenna device according to a second modified example of the embodiment. FIG. [Figure 6A] 13 is a diagram illustrating an example of a cross-sectional configuration of an antenna device 100C according to a third modified example of the embodiment. FIG. [Figure 6B] 13 is a diagram illustrating an example of a cross-sectional configuration of an antenna device 100C according to a third modified example of the embodiment. FIG. [Figure 7] FIG. 13 is a diagram illustrating an example of the configuration of an antenna device 100D according to a fourth modified example of the embodiment. [Figure 8] FIG. 13 is a diagram illustrating an example of the configuration of an antenna device 100E according to a fifth modified example of the embodiment. [Figure 9] FIG. 13 is a diagram illustrating an example of the configuration of an antenna device 100F according to a sixth modified example of the embodiment. [Figure 10] FIG. 13 is a diagram illustrating an example of a configuration of an antenna device 100G according to a seventh modified example of the embodiment. [Figure 11] FIG. 13 is a diagram illustrating an example of a configuration of an antenna device 100H according to an eighth modified example of the embodiment. [Figure 12] FIG. 13 is a diagram illustrating an example of the configuration of an antenna device 100I according to a ninth modified example of the embodiment. [Figure 13] FIG. 23 is a diagram illustrating an example of the configuration of an antenna device 100J according to a tenth modified example of the embodiment. [Figure 14A] FIG. 23 is a diagram showing an example of the configuration of an antenna included in an antenna device according to an eleventh modified example of the embodiment. [Figure 14B] FIG. 23 is a diagram showing an example of the configuration of an antenna included in an antenna device according to an eleventh modified example of the embodiment. [Figure 15A] FIG. 23 is a diagram showing an example of the configuration of an antenna included in an antenna device according to a twelfth modified example of the embodiment. [Figure 15B] FIG. 23 is a diagram showing an example of the configuration of an antenna included in an antenna device according to a twelfth modified example of the embodiment. [Figure 15C] FIG. 23 is a diagram showing an example of the configuration of an antenna included in an antenna device according to a twelfth modified example of the embodiment. [Figure 16A] FIG. 23 is a diagram showing an example of the configuration of an antenna included in an antenna device according to a thirteenth modified example of the embodiment. [Figure 16B] FIG. 23 is a diagram showing an example of the configuration of an antenna included in an antenna device according to a thirteenth modified example of the embodiment. [Figure 17A] FIG. 23 is a diagram showing an example of the configuration of an antenna included in an antenna device according to a fourteenth modified example of the embodiment. [Figure 17B] FIG. 23 is a diagram showing an example of the configuration of an antenna included in an antenna device according to a fourteenth modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment to which the antenna device of the present disclosure is applied will be described. In the following, the same elements are denoted by the same reference numerals, and duplicated explanations may be omitted.

[0011] In the following, the XYZ coordinate system is defined and explained. The direction parallel to the X axis (X direction), the direction parallel to the Y axis (Y direction), and the direction parallel to the Z axis (Z direction) are mutually perpendicular. The X direction is an example of a first axis direction, the Y direction is an example of a second axis direction, and the Z direction is an example of a third axis direction. In the following, for convenience of explanation, the -Z direction side may be referred to as the lower side or bottom, and the +Z direction side as the upper side or top, but this does not represent a universal relationship between the top and bottom. In addition, a planar view refers to a view on an XY plane.

[0012] In the following, the terms "rows" and "columns" may be used to describe a plurality of rows of columns extending in the X direction arranged in the Y direction, and a plurality of columns of columns extending in the Y direction arranged in the X direction.

[0013] In the following description, the length, width, thickness, etc. of each part may be exaggerated to make the configuration easier to understand. Furthermore, the terms parallel, right angle, orthogonal, horizontal, vertical, up and down, etc., are permitted to be deviated to the extent that the effect of the embodiment is not impaired.

[0014] <Embodiment> Fig. 1A is a diagram showing an example of the configuration of an antenna device 100 according to an embodiment. Fig. 1B is a diagram showing an example of the configuration in a cross section taken along the line A1-A1 in Fig. 1A. Fig. 1C is a diagram showing an example of the configuration in a cross section taken along the line A2-A2 in Fig. 1A.

[0015] <Configuration of Antenna Device 100> The antenna device 100 includes a substrate 110, a substrate 120, a patch antenna 130, and a plurality of second antenna elements 140. The substrate 110 is an example of a first dielectric substrate, and the substrate 120 is an example of a second dielectric substrate. The second antenna elements 140 are an example of a second radiating element. In the following, as an example, a configuration in which there are 16 second antenna elements 140 will be described, but it is sufficient that there are a plurality of second antenna elements 140, and the number of second antenna elements 140 may be any number.

[0016] The patch antenna 130 has a plurality of first antenna elements 131 and one ground layer 132. The plurality of first antenna elements 131 are an example of a plurality of first radiating elements and an example of a plurality of antenna elements for a patch antenna. Each of the first antenna elements 131 and the ground layer 132 constitute a patch antenna. The single ground layer 132 is a common ground layer corresponding to each of the plurality of antenna elements for the patch antenna. The patch antenna 130 is a collection of a plurality of patch antennas corresponding to the plurality of first antenna elements 131. The number of the first antenna elements 131 is equal to the number of the second antenna elements 140. The first antenna elements 131 and the second antenna elements 140 overlapping each other in the vertical direction constitute one antenna. The antenna device 100 has a configuration including 16 antennas as an example. Such a plurality of antennas can be used for beamforming as an example.

[0017] The antenna device 100 has a configuration in which an upper surface 111 of a substrate 110 and a lower surface 121 of a substrate 120 are arranged to face each other. The surface 111 is an example of a first surface, and the surface 121 is an example of a second surface. A patch antenna 130 is provided on the substrate 110. More specifically, a plurality of first antenna elements 131 are provided on the surface 111 of the substrate 110, and a ground layer 132 is provided on the lower surface of the substrate 110. A second antenna element 140 is provided on the surface 121 of the substrate 120. The substrates 110 and 120 are fixed by a housing, a holder, or the like (not shown).

[0018] Here, the configuration of the antenna device 100 will be described with reference to Figs. 2A to 2C in addition to Figs. 1A to 1C. Fig. 2A is a diagram showing an example of the planar configuration of the substrate 110 and the patch antenna 130. Fig. 2B is a diagram showing an example of the configuration of the multiple second antenna elements 140. The multiple second antenna elements 140 are provided on the lower surface 121 of the substrate 120, but Fig. 2B shows only the multiple second antenna elements 140 on the XY plane. Fig. 2C is a diagram showing an example of the configuration of the substrate 120.

[0019] In the following, as an example, a configuration in which the operating frequency band of the antenna device 100 is 28 GHz will be described. Note that the operating frequency band of the antenna device 100 is not limited to 28 GHz, but may be, for example, a frequency band belonging to the millimeter wave band or a frequency band included in Sub-6. The millimeter wave band includes the quasi-millimeter wave band of 24 GHz to 30 GHz in addition to the frequency band of 30 GHz to 300 GHz.

[0020] <Substrate 110> The substrate 110 is a flat substrate extending parallel to the XY plane. The substrate 110 is, for example, a wiring substrate made of epoxy resin or the like. For example, the size of the substrate 110 is 24 mm in length in the X direction, 30 mm in length in the Y direction, and 0.26 mm in thickness in the Z direction.

[0021] A plurality of first antenna elements 131 are provided on an upper surface 111 of the substrate 110, and a ground layer 132 is provided on a lower surface of the substrate 110. Through holes penetrating the substrate 110 in the Z direction are formed in the substrate 110 at positions corresponding to two power feeding points (an example of a power feeding section) of the first antenna elements 131, and vias 135H and 135V are formed in the through holes. The positions of the vias 135H and 135V will be described later.

[0022] <Substrate 120> The substrate 120 is a flat substrate extending parallel to the XY plane, and has a lower surface 121, a frame portion 122, beam portions 123X and 123Y, and a through hole 124. The substrate 120 is, for example, a wiring substrate made of epoxy resin, PTFE (polytetrafluoroethylene), PPE (polyphenylene ether), LTCC (low temperature co-fired ceramics), or the like, similar to the substrate 110. For example, the size of the substrate 120 is 24 mm in the X direction, 30 mm in the Y direction, and 0.47 mm in the Z direction. For example, the size of the substrate 120 in a plan view is equal to the size of the substrate 110 in a plan view.

[0023] The frame portion 122 is a portion of the frame along the outer edge of the substrate 120 in a plan view, and is connected to the ends of the outer edge sides of the beam portions 123X and 123Y. In a plan view, the beam portions 123X, 123Y, and the through holes 124 are located inside the frame portion 122. Hereinafter, when the beam portions 123X and 123Y are not to be distinguished from each other, they will be simply referred to as the beam portion 123. The beam portions 123X and 123Y have a holding portion 123A that is wider than other portions of the beam portions 123X and 123Y in a plan view.

[0024] The beam portion 123X is a beam-shaped portion extending in the X direction between the through holes 124 adjacent in the Y direction. The beam portion 123Y is a beam-shaped portion extending in the Y direction between the through holes 124 adjacent in the X direction. The beam portions 123X and 123Y intersect at multiple points in a plan view.

[0025] The holding portion 123A is a portion where the second antenna element 140 is formed on the lower surface 121, and is provided to hold the second antenna element 140. As an example, the holding portion 123A has a square shape in a plan view, and is a portion that is wider than other portions of the beam portions 123X and 123Y. The size of the holding portion 123A in a plan view is approximately equal to the size of the second antenna element 140 in a plan view.

[0026] The retaining portion 123A is provided in approximately half of the portion where the beam portions 123X and 123Y intersect in a plan view. More specifically, the retaining portion 123A is disposed at every other portion where the beam portions 123X and 123Y intersect in the X direction, and is also disposed at every other portion where the beam portions 123X and 123Y intersect in the Y direction.

[0027] Since the number of holding portions 123A is equal to the number of second antenna elements 140, the antenna device 100 has, as an example, 16 holding portions 123A as shown in Fig. 2C. The 16 holding portions 123A are arranged in four rows in the X direction, and four holding portions 123A are arranged in each row in the Y direction.

[0028] The positions in the Y direction of the four holding parts 123A in the first row from the -X direction side are equal to the positions in the Y direction of the four holding parts 123A in the third row from the -X direction side. Also, the positions in the Y direction of the four holding parts 123A in the second row from the -X direction side are equal to the positions in the Y direction of the four holding parts 123A in the fourth row from the -X direction side. As an example, the intervals (pitch) in the Y direction of the four holding parts 123A in each row are equal.

[0029] The positions in the Y direction of the four holding portions 123A in the first and third rows from the -X direction side are shifted by half the pitch of the holding portions 123A in the Y direction from the positions in the Y direction of the four holding portions 123A in the second and fourth rows from the -X direction side.

[0030] In addition, the four holding portions 123A in the first and third rows from the -X direction side, and the four holding portions 123A in the second and fourth rows from the -X direction side are arranged so that the distance between adjacent holding portions 123A in a direction of 30 degrees to the X axis and Y axis in a planar view is equal to the pitch of the holding portions 123A in the Y direction.

[0031] 2C, in the antenna device 100, the centers of the three closest holding parts 123A in a two-dimensional arrangement in a plan view are positioned at the vertices of an equilateral triangle. The length of one side of the equilateral triangle is equal to the pitch of the holding parts 123A in the Y direction.

[0032] The through holes 124 are formed inside the frame portion 122 in a plan view, in a portion excluding the beam portions 123X and 123Y. The holding portion 123A is a portion of the beam portions 123X and 123Y. In other words, the portions remaining after the multiple through holes 124 are formed in the flat substrate 120 are the frame portion 122, the beam portions 123X, and the beam portions 123Y.

[0033] <Patch antenna 130> The patch antenna 130 has a plurality of first antenna elements 131 and one ground layer 132. As shown in Fig. 2A, the plurality of first antenna elements 131 are formed on an upper surface 111 of the substrate 110. Moreover, the ground layer 132 is formed over substantially the entire surface of the lower surface of the substrate 110.

[0034] As described above, each first antenna element 131 and ground layer 132 form a patch antenna, and one ground layer 132 is a common ground layer corresponding to each first antenna element 131, so that patch antenna 130 is a collection of multiple patch antennas.

[0035] The shape of the first antenna element 131 in a plan view is, for example, a square. Here, a form in which the first antenna element 131 is square in a plan view will be described, but the first antenna element 131 may be circular in a plan view. The lengths of the first antenna element 131 in the X direction and the Y direction may be set to appropriate lengths in relation to the wavelength at the operating frequency of the antenna device 100, taking into consideration the shortening rate of the wavelength due to the relative dielectric constant of the substrate 110, etc.

[0036] The shape and size of the first antenna element 131 in a plan view and the shape and size of the second antenna element 140 in a plan view are different as an example, but may be the same. By making the shapes or sizes of the first antenna element 131 and the second antenna element 140 different in a plan view, it is possible to broaden the bandwidth of the antenna device 100. Here, as an example, a form in which the shapes of the first antenna element 131 and the second antenna element 140 are both square and the size of the second antenna element 140 is larger than the size of the first antenna element 131 will be described. Moreover, the number of the first antenna elements 131 is equal to the number of the second antenna elements 140. Moreover, the positions of the multiple first antenna elements 131 and the positions of the multiple second antenna elements 140 are equal.

[0037] As described above, the positions of the second antenna elements 140 are the same as the positions of the holding portions 123A, and therefore the positions of the first antenna elements 131 are the same as the positions of the holding portions 123A in a plan view.

[0038] 2A, the multiple first antenna elements 131 are arranged such that the centers of the three closest first antenna elements 131 in a two-dimensional arrangement in a plan view are located at the vertices of an equilateral triangle. The length of one side of the equilateral triangle is equal to the pitch of the holding portion 123A in the Y direction. In other words, the pitch between the centers of the three closest first antenna elements 131 in a two-dimensional arrangement in a plan view is equal to the pitch of the holding portion 123A in the Y direction.

[0039] Vias 135H and 135V for power supply are connected to each first antenna element 131. Since the vias 135H and 135V are located below the first antenna element 131, the positions of the vias 135H and 135V in a plan view are indicated by dashed lines in Fig. 2A. The two points at which the vias 135H and 135V are connected to the first antenna element 131 are power supply points.

[0040] As an example, the via 135H is located directly below the center in the Y direction of the end portion on the -X direction side of the first antenna element 131 in a plan view. Also, as an example, the via 135V is located directly below the center in the X direction of the end portion on the -Y direction side of the first antenna element 131 in a plan view.

[0041] Here, as an example, when using the antenna device 100, the orientation of the antenna device 100 is specified so that the XZ plane is parallel to the horizontal plane. The feed point where the via 135H is connected to the first antenna element 131 is a feed point that feeds a horizontally polarized signal. Also, the feed point where the via 135V is connected to the first antenna element 131 is a feed point that feeds a vertically polarized signal.

[0042] When power is supplied to the first antenna element 131 through the via 135H, the first antenna element 131 is excited in the X direction and radiates a horizontally polarized radio wave. When power is supplied to the first antenna element 131 through the via 135V, the first antenna element 131 is excited in the Y direction and radiates a vertically polarized radio wave.

[0043] By feeding power to the first antenna element 131 at two feeding points, the patch antenna 130 radiates horizontally polarized radio waves and vertically polarized radio waves in the +Z direction. Note that, here, a form in which the first antenna element 131 radiates horizontally polarized and vertically polarized radio waves will be described as an example, but the radio waves radiated by the first antenna element 131 may be either horizontally polarized or vertically polarized, or may be radio waves of a polarization other than horizontally polarized and vertically polarized. The polarization other than horizontally polarized and vertically polarized waves may be a polarization of ±45 degrees, for example.

[0044] For example, in a plan view, the via 135H may be located directly below the center in the Y direction of the end portion on the +X direction side of the first antenna element 131. Also, for example, the via 135V may be located directly below the center in the X direction of the end portion on the +Y direction side of the first antenna element 131.

[0045] Furthermore, the shape and / or size of the first antenna element 131 in a plan view and the shape and / or size of the second antenna element 140 in a plan view do not have to be equal to each other.

[0046] Although the above describes a configuration in which power is fed to first antenna element 131 through via 135H or via 135V, power may be fed through a microstrip line, a probe, an L-shaped probe bent into an L-shape, or a slot feed section. Also, a feed line extending on upper surface 111 of substrate 110 may be provided.

[0047] Also, an amplifier or the like may be inserted in series into a power supply line extending on the upper surface 111 of the substrate 110. Such an amplifier may then be disposed on the upper surface 111 of the substrate 110. By disposing the amplifier on the upper surface 111 of the substrate 110, heat generated by the amplifier can be efficiently dissipated through the through-hole 124. In particular, by disposing the amplifier directly below the through-hole 124, the heat dissipation efficiency can be further improved.

[0048] Moreover, such an amplifier may be disposed above the first antenna element 131. Heat generated by the amplifier can be efficiently dissipated through the through-hole 124, and in particular, by disposing the amplifier directly below the through-hole 124, the heat dissipation efficiency can be further improved.

[0049] <Second antenna element 140> The second antenna element 140 is formed on the lower surface 121 of the substrate 120, and more specifically, on the lower surface of the holding portion 123A of the surface 121. Note that, although a configuration in which the second antenna element 140 is formed on the lower surface of the holding portion 123A will be described here, it may also be formed on the upper surface of the holding portion 123A. Furthermore, one second antenna element 140 may be formed on each of the lower surface and the upper surface of the holding portion 123A.

[0050] That is, the multiple second antenna elements 140 are arranged along the X direction and the Y direction in a plan view, and the beam portions 123X and 123Y extend along the X direction and the Y direction in a plan view.

[0051] As an example, the second antenna element 140 is square in a plan view and has a size in a plan view equal to the size in a plan view of the first antenna element 131. The number of the second antenna elements 140 is equal to the number of the first antenna elements 131, and the positions of the multiple second antenna elements 140 in a plan view are equal to the positions of the multiple first antenna elements 131 in a plan view.

[0052] The second antenna element 140 does not have a feeding point like the first antenna element 131. Each second antenna element 140 is electromagnetically coupled mainly to the first antenna element 131 located directly below, and is electromagnetically coupled mainly to the first antenna element 131 located directly below. That is, each second antenna element 140 is fed and excited mainly by radio waves radiated in the +Z direction by the first antenna element 131 located directly below. Here, the reason why it is written "mainly" is that each second antenna element 140 is electromagnetically coupled to the first antenna element 131 other than the first antenna element 131 located directly below, but since the first antenna element 131 located directly below is the closest, the electromagnetic coupling with the first antenna element 131 located directly below is dominant. The second antenna element 140 is fed and excited by radio waves radiated from the first antenna element 131, and radiates radio waves in the +Z direction.

[0053] When the first antenna element 131 is powered through the via 135H and excited in the X direction, the second antenna element 140 is excited in the X direction and radiates a horizontally polarized radio wave. When the first antenna element 131 is powered through the via 135V and excited in the Y direction, the second antenna element 140 is excited in the Y direction and radiates a vertically polarized radio wave. That is, the X direction and the Y direction are perpendicular to the excitation direction of the electric field of the multiple second antenna elements 140 in a planar view.

[0054] The positions of the second antenna elements 140 are equal to the positions of the holding parts 123A and the positions of the first antenna elements 131. Therefore, as shown in FIG. 2B, the second antenna elements 140 are arranged such that the centers of the three second antenna elements 140 that are closest in the two-dimensional arrangement in a plan view are located at the apexes of an equilateral triangle. The length of one side of the equilateral triangle is equal to the pitch of the holding part 123A in the Y direction. In other words, the pitch between the centers of the three second antenna elements 140 that are closest in the two-dimensional arrangement in a plan view is equal to the pitch of the holding part 123A in the Y direction.

[0055] In this way, by arranging the three second antenna elements 140 that are closest to each other in a two-dimensional arrangement so that they are located at the vertices of an equilateral triangle in a planar view, the pitch between the second antenna elements 140 can be expanded while minimizing the expansion of the spacing between the second antenna elements 140 in the X and Y directions, and therefore it is possible to reduce mutual coupling between antennas constructed with the first antenna element 131 and the second antenna element 140.

[0056] In addition, by making the pitch between the centers of the three nearest first antenna elements 131 and the three nearest second antenna elements 140 in a two-dimensional arrangement equal in planar view, the mutual coupling between the antennas constructed with the first antenna elements 131 and the second antenna elements 140 can be equalized.

[0057] In addition, in a plan view, the beam portions 123X and 123Y pass through the center of the width (length) in the X and Y directions of the second antenna element 140. That is, the beam portions 123X and 123Y extend on straight lines connecting the centers of the multiple second antenna elements 140 in the X and Y directions in a plan view.

[0058] When the second antenna element 140 is excited in the X direction, the electric field is smallest at the center of the X direction width of the second antenna element 140. Similarly, when the second antenna element 140 is excited in the Y direction, the electric field is smallest at the center of the Y direction width of the second antenna element 140.

[0059] The beam portions 123X and 123Y, which have a higher dielectric constant than the air present in the through hole 124, pass through the position where the electric field is smallest when the second antenna element 140 is excited as described above, and can contribute to reducing mutual coupling between antennas formed by the first antenna element 131 and the second antenna element 140 overlapping vertically. That is, for the second antenna element 140 excited in the X direction and the Y direction, the beam portions 123X and 123Y are passed through the center of the width of the second antenna element 140 in the X direction and the Y direction, thereby reducing mutual coupling between antennas formed by the first antenna element 131 and the second antenna element 140 overlapping vertically.

[0060] The antenna device 100 may be configured to include either the via 135H for horizontal polarization or the via 135V for vertical polarization.

[0061] <Simulation results> Fig. 3A is a diagram showing a simulation result of a comparative antenna device. The comparative antenna device includes a substrate 20 without a through hole 124, instead of the substrate 120. Fig. 3A shows the substrate 110, two adjacent first antenna elements 131, a via 135H, the substrate 20, and two adjacent second antenna elements 140. That is, Fig. 3A shows a simulation result in a state where there are two antennas constructed with the first antenna element 131 and the second antenna element 140. The two antennas are adjacent to each other.

[0062] Fig. 3B is a diagram showing a simulation result of the antenna device 100 of the embodiment. Fig. 3B shows the substrate 110, two adjacent first antenna elements 131, a via 135H, the substrate 120, and two adjacent second antenna elements 140. Two through holes 124 and one beam portion 123X are present between the two adjacent second antenna elements 140. That is, Fig. 3B shows a simulation result in a state where there are two antennas constructed of the first antenna element 131 and the second antenna element 140, similar to Fig. 3A. The two antennas are adjacent to each other.

[0063] 3A and 3B show, as an example, the calculation results of the electric field distribution in a cross section parallel to the XZ plane. In the simulation, power was fed only to the via 135H for horizontal polarization of the first antenna element 131 on the left side, and power was not fed to the first antenna element 131 on the right side. Under these conditions, it was confirmed what kind of electric field distribution was obtained.

[0064] 3A, in the two antennas of the comparative antenna device, it can be seen that the electric field propagates in a rightward direction from the left antenna (the first antenna element 131 and the second antenna element 140) to the right antenna (the first antenna element 131 and the second antenna element 140). It can be seen that the coupling between the two adjacent antennas is strong.

[0065] In contrast, as shown in Fig. 3B, in the two antennas of the antenna device 100 of the embodiment, it can be seen that the electric field propagating in a rightward direction from the left antenna (first antenna element 131 and second antenna element 140) to the right antenna (first antenna element 131 and second antenna element 140) is reduced compared to Fig. 3A. Also, in Fig. 3B, the electric field propagating in an upward direction from the second antenna element 140 is increased compared to Fig. 3A. It is considered that the electric field leaks in the +Z direction due to the through-hole 124 around the second antenna element 140.

[0066] From the above results, it was found that the antenna device 100 of the embodiment can reduce mutual coupling between antennas formed of the first antenna element 131 and the second antenna element 140 overlapping one above the other by providing the through hole 124 in the substrate 120. By reducing the mutual coupling between antennas formed of the first antenna element 131 and the second antenna element 140 overlapping one above the other, it is possible to increase the gain of the antenna device 100. It was also found that the antenna device 100 of the embodiment can reduce mutual coupling between adjacent antennas and increase gain by providing the through hole 124 in the substrate 120, whereby the electric field leaks in the +Z direction and the electric field leaking in the X direction and Y direction is reduced.

[0067] <Effects> The antenna device 100 includes a substrate 110 (first dielectric substrate) having a surface 111, a substrate 120 (second dielectric substrate) facing the substrate 110, a plurality of first radiating elements provided on the surface 111, a power supply unit for feeding power to the first radiating elements, a plurality of second antenna elements 140 provided on the surface 121 of the substrate 120 and coupled to the plurality of first radiating elements, and through holes 124 formed around the plurality of second antenna elements 140 of the substrate 120 in a plan view, and the plurality of first radiating elements are a plurality of first antenna elements 131 for a patch antenna. In this way, in the antenna device 100, the through holes 124 are provided around the second antenna element 140 in a plan view, so that the effective relative dielectric constant of the components around the second antenna element 140 can be reduced. Therefore, the mutual coupling between antennas constructed by the first antenna element 131 and the second antenna element 140 overlapping vertically can be reduced, and the gain of the antenna device 100 can be increased. In addition, in this way, in the antenna device 100, the through hole 124 is provided around the second antenna element 140 in a plan view, so that the electric field leaking in the +Z direction is increased and the electric field leaking in the X direction and Y direction is reduced, thereby reducing mutual coupling between adjacent antennas and increasing the gain. Also, by providing the through hole 124 in the substrate 120, the weight of the antenna can be reduced.

[0068] Therefore, it is possible to provide the antenna device 100 with increased gain.

[0069] The power feed unit may be a slot power feed unit that feeds power at a distance from the first radiating element, a power feed line that feeds power at a distance from the first radiating element, an L-shaped probe that feeds power at a distance from the first radiating element, or a probe feed that is connected to the first radiating element and feeds power. Power may be fed by various power feed units. Specific configurations of these power feed units will be described later.

[0070] Furthermore, the multiple first radiating elements may be multiple first antenna elements 131 for a patch antenna, and the multiple second antenna elements 140 may be arranged at positions overlapping the multiple first antenna elements 131 in a plan view. Therefore, each second antenna element 140 is electromagnetically coupled to each first antenna element 131, and the second antenna element 140 can be efficiently fed with radio waves radiated from the first antenna element 131, making it possible to provide an antenna device 100 with increased gain.

[0071] Furthermore, the shape of the multiple second antenna elements 140 in a plan view may be equal to the shape of the multiple first antenna elements 131 in a plan view. Therefore, each second antenna element 140 is electromagnetically coupled to each first antenna element 131 in a better state, and the second antenna element 140 can be efficiently fed with radio waves radiated from the first antenna element 131, thereby providing an antenna device 100 with increased gain.

[0072] Furthermore, the substrate 120 may have a plurality of through holes 124, and may have a plurality of beam portions 123X and 123Y extending between the plurality of through holes 124 in a plan view and holding a plurality of second antenna elements 140. By holding the plurality of second antenna elements 140 with the plurality of beam portions 123X and 123Y, it is possible to provide an antenna device 100 that can stably hold the plurality of second antenna elements 140 and has an increased gain.

[0073] Furthermore, beam portion 123 may have a plurality of holding portions 123A that are wider than other portions of beam portion 123, and the plurality of second antenna elements 140 may be held by the plurality of holding portions 123A, respectively. By holding the plurality of second antenna elements 140 by the plurality of widened holding portions 123A, it is possible to provide antenna device 100 that can hold the plurality of second antenna elements 140 more stably and has increased gain.

[0074] Furthermore, the multiple second antenna elements 140 are arranged along the X direction (first axis direction) and the Y direction (second axis direction) in plan view, and the multiple beam portions 123 may extend along the X direction (first axis direction) or the Y direction (second axis direction) in plan view. By arranging the multiple second antenna elements 140 in the same direction as the extending direction of the multiple beam portions 123X and 123Y, a configuration can be realized that easily reduces mutual coupling between antennas constructed of the first antenna element 131 and the second antenna element 140 that are stacked vertically.

[0075] Furthermore, the X direction (first axis direction) or the Y direction (second axis direction) may be perpendicular to the excitation direction of the electric field of the second antenna elements 140 in a plan view. By making the extending direction of the beam portions 123X and 123Y perpendicular to the excitation direction of the electric field of the second antenna elements 140, it is possible to realize a configuration that can more easily reduce mutual coupling between antennas formed of the first antenna element 131 and the second antenna element 140 that are stacked vertically.

[0076] Furthermore, the multiple beam portions 123X and 123Y may extend on a straight line connecting the centers of the multiple second antenna elements 140 in the X direction (first axis direction) and the Y direction (second axis direction) in a plan view. The beam portions 123X and 123Y, which have a higher dielectric constant than the air present in the through hole 124, pass through a position where the electric field is smallest when the second antenna element 140 is excited, thereby reducing mutual coupling between antennas formed of the first antenna element 131 and the second antenna element 140 that are stacked vertically.

[0077] Furthermore, the substrate 120 may have a frame portion 122 that is provided along the outer edge of the substrate 120 in a plan view and is connected to the outer edge side ends of the multiple beam portions 123X and 123Y. By having the frame portion 122 hold the outer edge side ends of the multiple beam portions 123X and 123Y, the multiple beam portions 123X and 123Y can hold the second antenna element 140 more stably, and it is possible to provide an antenna device 100 with increased gain.

[0078] Antenna devices according to the first to tenth modified examples of the embodiment will be described below. The following description will focus on the differences from the antenna device 100 shown in Fig. 1. The configurations of the first to tenth modified examples described below can be combined.

[0079] <First Modification> Fig. 4 is a diagram showing an example of the configuration of an antenna device 100A according to a first modified example of the embodiment. The antenna device 100A differs from the antenna device 100 shown in Fig. 1 in the configuration of the substrate 120. In Fig. 4, the vias 135H and 135V are indicated by dashed lines to indicate the positions of the vias 135H and 135V.

[0080] The substrate 120 of the antenna device 100A differs from the substrate 120 of the antenna device 100 shown in Fig. 1 in that the number of beam portions 123Y extending in the Y direction is increased. The substrate 120 shown in Fig. 4 has a configuration in which one beam portion 123Y is added between each of the adjacent beam portions 123Y in the substrate 120 shown in Fig. 1 and Fig. 2C.

[0081] In this way, the number of beam portions 123Y may be increased as necessary to increase the strength of the substrate 120. In the antenna device 100A of the first modification, the substrate 120 has the through-hole 124 provided around the second antenna element 140, so that mutual coupling between antennas formed of the first antenna element 131 and the second antenna element 140 overlapping vertically can be reduced, thereby increasing the gain of the antenna device 100A.

[0082] The antenna device 100A may be configured to include either the via 135H for horizontal polarization or the via 135V for vertical polarization.

[0083] <Second Modification> FIG. 5A is a diagram showing an example of a configuration of a part of an antenna device according to a second modified example of the embodiment. The antenna device according to the second modified example includes a slot power feeder 130B instead of the patch antenna 130. The antenna device according to the second modified example includes an antenna element 140A instead of the second antenna element 140. The slot power feeder 130B is an example of a first radiating element, and the antenna element 140A is an example of a second radiating element. The antenna element 140A has the same configuration as the second antenna element 140 of the antenna device 100 according to the embodiment, and is disposed at the same position. Since the antenna device according to the second modified example of the embodiment does not include a patch antenna 130 having a first antenna element 131, each antenna included in the antenna device according to the second modified example of the embodiment is constructed by one antenna element 140A.

[0084] 5A shows a ground layer 132B arranged on the upper surface 111 of the substrate 110 and a feed line 133B arranged on the lower surface of the substrate 110 in a portion corresponding to one antenna element 140A of the antenna device of the second modified example. The feed line 133B and the ground layer 132B form a microstrip line. Two slot feed sections 130B are formed in the ground layer 132B for one antenna element 140A.

[0085] As an example, the two slot power feed sections 130B are located inside the outer edge of the antenna element 140A in a planar view. As an example, one slot power feed section 130B is located along the outer edge extending in the Y direction on the +X direction side of the antenna element 140A in a planar view. Directly below this slot power feed section 130B, a power feed line 133B extending in the X direction is provided. By feeding power to this slot power feed section 130B from the power feed line 133B, the antenna element 140A can be excited in the X direction to radiate horizontally polarized radio waves.

[0086] As an example, the other slot power feeding section 130B is located along the outer edge extending in the X direction on the -Y direction side of antenna element 140A in a plan view. Directly below this slot power feeding section 130B, a power feeding line 133B extending in the Y direction is provided. By feeding power to this slot power feeding section 130B, it is possible to excite antenna element 140A in the Y direction and radiate vertically polarized radio waves.

[0087] An antenna device of a second modified embodiment having a slot power feed section 130B instead of patch antenna 130 shown in Fig. 2A includes a substrate 110 (first dielectric substrate) having a surface 111, a substrate 120 (second dielectric substrate) facing substrate 110, a plurality of first radiating elements provided on surface 111, a plurality of antenna elements 140A provided on surface 121 of substrate 120 and coupled to the plurality of first radiating elements, and through holes 124 formed around the plurality of antenna elements 140A of substrate 120 in a plan view, and the plurality of first radiating elements are a plurality of slot power feed sections 130B. Surface 121 is an example of a second surface.

[0088] In this way, the antenna device of the second modified embodiment has through holes 124 around the antenna element 140A in plan view, so that the effective relative dielectric constant of the components around the antenna element 140A can be reduced. Therefore, the mutual coupling between the antennas constructed with the antenna elements 140A can be reduced, and the gain of the antenna device of the second modified embodiment can be increased. In addition, since the through holes 124 are provided around the antenna element 140A in plan view, the electric field leaking in the +Z direction is increased, and the electric field leaking in the X and Y directions is reduced, so that the mutual coupling between adjacent antennas can be reduced and the gain can be increased.

[0089] Therefore, according to the second modified example of the embodiment, it is possible to provide an antenna device with increased gain.

[0090] The antenna device of the second modified example may be configured to include either slot feeding section 130B for horizontally polarized waves or slot feeding section 130B for vertically polarized waves.

[0091] Moreover, the antenna element 140A may be provided on the surface on the +Z direction side of the substrate 120. In this case, the surface on the +Z direction side of the substrate 120 is an example of a second surface.

[0092] The antenna device of the second modified example may include an antenna element other than antenna element 140A on the surface on the +Z direction side of substrate 120. The antenna device of the second modified example having such a configuration will be described with reference to Figs. 5B to 5C.

[0093] 5B and 5C are diagrams showing an example of the configuration of a portion corresponding to one of the antennas included in the antenna device of the second modified example. FIG. 5B is an exploded view, and FIG. 5C is a cross-sectional view. The cross section shown in FIG. 5C corresponds to the cross section of the substrate 120 taken along the line BB in FIG. 5B. The cross section taken along the line BB is a cross section parallel to the XZ plane passing through the center of the holder 123A in the Y direction.

[0094] The antenna included in the antenna device of the second variant includes a substrate 110 having a feed line 133B formed on its surface on the -Z direction side and a ground layer 132B formed on its surface on the +Z direction side, an antenna element 140A, a substrate 120, and an antenna element 140B, as shown in Figures 5B and 5C.

[0095] Antenna element 140A is provided on the surface on the -Z direction side of holding portion 123A of substrate 120, and antenna element 140B is provided on the surface on the +Z direction side of holding portion 123A of substrate 120. If antenna elements 140A and 140B have different sizes and different resonant frequencies, a wider bandwidth can be achieved compared to a case where antenna element 140B is not included.

[0096] <Third Modification> Fig. 6A and Fig. 6B are diagrams showing an example of a cross-sectional configuration of an antenna device 100C according to a third modified example of the embodiment. Fig. 6A shows an example of a cross-sectional configuration corresponding to the cross section taken along the line A1-A1 in Fig. 1A, similar to Fig. 1B, and Fig. 6B shows an example of a cross-sectional configuration corresponding to the cross section taken along the line A2-A2 in Fig. 1A, similar to Fig. 1C.

[0097] 1, a dielectric member 150 is added between the substrates 110 and 120 of the antenna device 100. The dielectric member 150 is a dielectric member having a relative dielectric constant lower than the relative dielectric constants of the substrates 110 and 120. In other words, the antenna device 100C further includes a dielectric member 150 having a relative dielectric constant lower than the relative dielectric constants of the substrates 110 and 120.

[0098] The dielectric member 150 can be realized, for example, by a plate-like member made of PTFE (polytetrafluoroethylene), a foamed substrate which is a substrate made of expanded polystyrene, or a dielectric or metallic spacer with through holes or holes formed therein. As an example, the relative dielectric constant of epoxy resin usable for the substrates 110 and 120 is 3.3, whereas the relative dielectric constant of PTFE is 2.2 to 3.0 and the relative dielectric constant of a foamed substrate is 1.1 to 1.3.

[0099] 6A and 6B, the dielectric member 150 is located between the substrates 110 and 120, but in addition to or instead of being located between the substrates 110 and 120, the dielectric member 150 may be located inside at least a portion of the through hole 124.

[0100] The dielectric member 150 has a lower relative dielectric constant than the relative dielectric constants of the substrates 110 and 120. Therefore, like the antenna device 100 of the embodiment shown in Figures 1A to 2C, the antenna device 100C of the third modified embodiment can reduce mutual coupling between antennas formed of the first antenna element 131 and the second antenna element 140 that are stacked one on top of the other, thereby increasing the gain of the antenna device 100C.

[0101] The antenna device 100C may include either the via 135H for horizontal polarization or the via 135V for vertical polarization.

[0102] Moreover, the dielectric member 150 may be added to the antenna device 100 of the embodiment and any of the antenna devices 100A and 100C to 100J of the first to tenth modified examples of the embodiment.

[0103] <Fourth Modification> Fig. 7 is a diagram showing an example of the configuration of an antenna device 100D according to a fourth modified example of the embodiment. The antenna device 100D is different from the antenna device 100 shown in Fig. 1 in the configuration of the substrate 120. In Fig. 7, the vias 135H and 135V are indicated by dashed lines to indicate the positions of the vias 135H and 135V.

[0104] The substrate 120 of the antenna device 100D differs from the substrate 120 of the antenna device 100 shown in Fig. 1 in that it has a plurality of beam portions 123 extending in directions having angles with respect to the X direction and the Y direction. The angles of the beam portions 123 with respect to the X direction and the Y direction are greater than 0 degrees in absolute value. The plurality of beam portions 123 of the substrate 120 shown in Fig. 7 extend in directions having angles with respect to the X direction and the Y direction so as to surround a diamond-shaped through hole 124 in a plan view.

[0105] In this manner, by using a substrate 120 having a plurality of beam portions 123 extending in a direction at an angle to the X direction and the Y direction, the mutual coupling between antennas formed by the first antenna element 131 and the second antenna element 140 overlapping one above the other can be reduced, thereby increasing the gain of the antenna device 100D.

[0106] The antenna device 100D may include either the via 135H for horizontal polarization or the via 135V for vertical polarization.

[0107] <Fifth Modification> Fig. 8 is a diagram showing an example of the configuration of an antenna device 100E according to a fifth modified example of the embodiment. The antenna device 100E is different from the antenna device 100 shown in Fig. 1 in the configuration of the substrate 120. In Fig. 8, the vias 135H and 135V are indicated by dashed lines to indicate the positions of the vias 135H and 135V.

[0108] The position of the beam portion 123Y relative to the holding portion 123A of the substrate 120 of the antenna device 100E is different from that of the substrate 120 of the antenna device 100 shown in Fig. 1. In Fig. 8, the beam portion 123Y is shifted toward the +X direction side from the center in the X direction of the holding portion 123A in a plan view, which is different from that of the substrate 120 of the antenna device 100 shown in Fig. 1.

[0109] In this way, the beam portion 123Y of the substrate 120 may be offset in the +X direction from the center in the X direction of the holding portion 123A in a plan view. It is preferable that the offset of the beam portion 123Y in the X direction is to an extent that does not affect the mutual coupling between the antennas formed by the first antenna element 131 and the second antenna element 140 that are stacked vertically.

[0110] Since the antenna device 100E of the fifth modified example has a through hole 124 in the substrate 120, it is possible to reduce the mutual coupling between the antennas formed by the first antenna element 131 and the second antenna element 140 that are stacked vertically, thereby increasing the gain of the antenna device 100E.

[0111] Beam 123Y of substrate 120 may be offset in the -X direction from the center of holder 123A in the X direction in plan view. Beam 123X of substrate 120 may be offset in the +Y direction or the -Y direction from the center of holder 123A in the Y direction in plan view.

[0112] Furthermore, the antenna device 100E may be configured to include either the via 135H for horizontal polarization or the via 135V for vertical polarization.

[0113] <Sixth Modification> Fig. 9 is a diagram showing an example of the configuration of an antenna device 100F according to a sixth modified example of the embodiment. The antenna device 100F differs from the antenna device 100 shown in Fig. 1 in the configuration of the substrate 120. In Fig. 9, the vias 135H and 135V are indicated by dashed lines to indicate the positions of the vias 135H and 135V.

[0114] 1 in that the substrate 120 of the antenna device 100F has a plurality of through holes 124 which are cylindrical through holes formed by drilling, and does not have beam portions 123X and 123Y. In plan view, the periphery of each holding portion 123A is covered with the plurality of through holes 124. That is, for each of the plurality of second antenna elements 140, the plurality of through holes 124 are formed so as to surround the periphery of the second antenna element 140 in plan view.

[0115] In this manner, the substrate 120 may have a configuration having a plurality of through holes 124 formed so as to surround the periphery of each second antenna element 140. By providing the through holes 124 around the periphery of the second antenna element 140, mutual coupling between antennas formed of the first antenna element 131 and the second antenna element 140 that are stacked vertically can be reduced.

[0116] In this way, in the antenna device 100F of the sixth variant, since the substrate 120 has a plurality of through holes 124 surrounding the second antenna element 140, the mutual coupling between the antennas formed by the first antenna element 131 and the second antenna element 140 overlapping one above the other can be reduced, thereby increasing the gain of the antenna device 100F.

[0117] The multiple through holes 124 may be through holes formed by a method other than drilling, and may be through holes having a shape other than a cylindrical shape, such as a square prism.

[0118] Furthermore, the antenna device 100F may be configured to include either the via 135H for horizontal polarization or the via 135V for vertical polarization.

[0119] <Seventh Modification> Fig. 10 is a diagram showing an example of the configuration of an antenna device 100G according to a seventh modified example of the embodiment. The antenna device 100G differs from the antenna device 100 shown in Fig. 1 in the configuration of the substrate 120. In Fig. 10, the via 135V is indicated by a dashed line to indicate the position of the via 135V.

[0120] The substrate 120 of the antenna device 100G differs from the substrate 120 of the antenna device 100 shown in Fig. 1 in that it does not have beam portions 123Y extending in the Y direction. The substrate 120 shown in Fig. 10 has a configuration in which the multiple beam portions 123Y in the substrate 120 shown in Fig. 1 and Fig. 2C are omitted. The antenna device 100G also differs from the antenna device 100 shown in Fig. 1 in that it does not include vias 135H for horizontal polarization.

[0121] In the antenna device 100G of the seventh modification, the substrate 120 has the through hole 124 provided around the second antenna element 140, so that it is possible to reduce mutual coupling between antennas formed of the vertically overlapping first antenna element 131 and second antenna element 140, thereby increasing the gain. Furthermore, since there is no beam portion 123Y, the planar size of the through hole 124 is increased, so that a configuration in which the electric field is more likely to propagate in the upward direction (+Z direction) is obtained.

[0122] The antenna device 100G includes a via 135V for vertical polarization but does not include a via 135H for horizontal polarization. The antenna device 100G does not include a beam 123Y. The beam 123X passes through the center in the Y direction of the holder 123A that holds the second antenna element 140 that radiates vertically polarized radio waves in the X direction. That is, the beam 123X passes through a position where the electric field is smallest when the second antenna element 140 is excited. Therefore, in a configuration in which the antenna device 100G radiates vertically polarized radio waves, the mutual coupling between the antennas formed by the first antenna element 131 and the second antenna element 140 that are stacked vertically can be effectively reduced, and the gain of the antenna device 100G can be increased.

[0123] Alternatively, a via hole 135H for horizontal polarization may be added below each first antenna element 131 of the substrate 110 of the antenna device 100G so as to radiate horizontally polarized radio waves and vertically polarized radio waves.

[0124] <Eighth Modification> Fig. 11 is a diagram showing an example of the configuration of an antenna device 100H according to an eighth modified example of the embodiment. The antenna device 100H is different from the antenna device 100 shown in Fig. 1 in the configuration of the substrate 120. In Fig. 11, the via 135H is indicated by a dashed line to indicate the position of the via 135H.

[0125] The substrate 120 of the antenna device 100H differs from the substrate 120 of the antenna device 100 shown in Fig. 1 in that it does not have beam portions 123X extending in the X direction. The substrate 120 shown in Fig. 11 has a configuration in which the multiple beam portions 123X in the substrate 120 shown in Fig. 1 and Fig. 2C are omitted. The antenna device 100H also differs from the antenna device 100 shown in Fig. 1 in that it does not include a via 135V for vertical polarization.

[0126] In the antenna device 100H of the eighth modification, the substrate 120 has the through hole 124 provided around the second antenna element 140, so that it is possible to reduce mutual coupling between antennas formed of the first antenna element 131 and the second antenna element 140 that are stacked vertically, thereby increasing the gain. Furthermore, since there is no beam portion 123X, the planar size of the through hole 124 is large, so that a configuration in which the electric field is more likely to propagate in the upward direction (+Z direction) is obtained.

[0127] The antenna device 100H includes a via 135H for horizontal polarization but does not include a via 135V for vertical polarization. The antenna device 100H does not include a beam 123X. The beam 123Y passes through the center in the X direction of the holder 123A that holds the second antenna element 140 that radiates horizontally polarized radio waves in the Y direction. That is, the beam 123Y passes through a position where the electric field is smallest when the second antenna element 140 is excited. Therefore, in a configuration in which the antenna device 100H radiates horizontally polarized radio waves, the mutual coupling between the antennas formed by the first antenna element 131 and the second antenna element 140 that are stacked vertically can be effectively reduced, and the gain of the antenna device 100H can be increased.

[0128] Alternatively, the antenna device 100H may be configured to emit horizontally polarized radio waves and vertically polarized radio waves by adding vias 135V for vertical polarization below each first antenna element 131 of the substrate 110.

[0129] <Ninth Variation> Fig. 12 is a diagram showing an example of the configuration of an antenna device 100I according to a ninth modified example of the embodiment. The antenna device 100I has a circular first antenna element 131, which is different in shape from the antenna device 100 shown in Fig. 1. The antenna device 100I also has a circular second antenna element 140, which is different in shape from the antenna device 100 shown in Fig. 1.

[0130] In this way, the first antenna element 131 of the patch antenna 130 may be circular in a plan view. In the antenna device 100I of the ninth modification, the substrate 120 has the through hole 124 provided around the second antenna element 140, and therefore it is possible to reduce mutual coupling between antennas formed of the first antenna element 131 and the second antenna element 140 that are stacked vertically, thereby increasing the gain of the antenna device 100I.

[0131] The circular first antenna element 131 may be applied to any of the antenna device 100 of the embodiment, the antenna device 100A of the first variant of the embodiment, and the antenna devices 100C to 100H and 100J of the third to eighth variants and the tenth variant of the embodiment.

[0132] Furthermore, the antenna device 100I may be configured to include either the via 135H for horizontal polarization or the via 135V for vertical polarization.

[0133] <Tenth Modification> Fig. 13 is a diagram showing an example of the configuration of an antenna device 100J according to a tenth modified example of the embodiment. The antenna device 100J is different from the antenna device 100 shown in Fig. 1 in the arrangement of the first antenna element 131 of the patch antenna 130 arranged on the substrate 110, the shape of the substrate 120, and the arrangement of the second antenna element 140. In Fig. 13, the vias 135H and 135V are shown by dashed lines to indicate the positions of the vias 135H and 135V. Also, the first antenna element 131 and the second antenna element 140 below the holding portion 123A are shown by dashed lines to indicate the positions of the first antenna element 131 and the second antenna element 140.

[0134] The antenna device 100J is configured such that the centers of the first antenna element 131, the holding portion 123A, and the second antenna element 140 in a plan view are disposed at the vertices of a square. The length of one side of the square is equal to the length of one side of the equilateral triangle shown in Figures 2A to 2C. In addition, in the substrate 120, the beam portions 123X and 123Y extend at equal intervals in the X and Y directions in accordance with the arrangement of the holding portion 123A described above.

[0135] In the antenna device 100J, the pitch between the first antenna elements 131 and the second antenna elements 140 adjacent to each other in the X and Y directions is equal to the length of one side of a square. In addition, the distance between the centers of the first antenna elements 131 and the centers of the second antenna elements 140 adjacent to each other in the direction at 45 degrees to the X and Y directions is √2 times the length of one side of a square. In the antenna device 100J, the distance between the centers of the first antenna elements 131 and the centers of the second antenna elements 140 adjacent to each other in the direction at 45 degrees to the X and Y directions is wider than the distance in the antenna device 100 shown in FIG. 1. The arrangement of the first antenna elements 131 and the second antenna elements 140 in a plan view is not limited to a triangular or rectangular arrangement.

[0136] In the antenna device 100J of the tenth variant, since the substrate 120 has a through hole 124 provided around the second antenna element 140, the mutual coupling between the antennas formed by the first antenna element 131 and the second antenna element 140 overlapping one above the other can be reduced, thereby increasing the gain of the antenna device 100J.

[0137] In the antenna device 100J, the length of one side of a square connecting the centers of the first antenna element 131, the holding portion 123A, and the second antenna element 140 may be shorter than the length of one side of an equilateral triangle shown in Figures 2A to 2C. For example, the distance between the centers of the first antenna elements 131, the centers of the holding portions 123A, and the centers of the second antenna elements 140 adjacent to each other in a direction at 45 degrees to the X direction and the Y direction may be equal to the length of one side of the equilateral triangle shown in Figures 2A to 2C.

[0138] Furthermore, the arrangement of the holding portion 123A, the first antenna element 131, and the second antenna element 140 in the antenna device 100J of the tenth variant of the embodiment may be applied to the antenna device 100 of the embodiment, the antenna device 100A of the first variant of the embodiment, and any of the antenna devices 100C to 100I of the third to ninth variants of the embodiment.

[0139] Furthermore, the antenna device 100J may be configured to include either the via 135H for horizontal polarization or the via 135V for vertical polarization.

[0140] In addition, eleventh to fourteenth modified examples of the embodiment will be described below. In the following, the same components as those described above will be given the same reference numerals, and the description thereof may be omitted. In addition, the eleventh to fourteenth modified examples can be combined with the embodiment and the first to tenth modified examples described above.

[0141] <Eleventh Modification> 14A and 14B are diagrams showing an example of the configuration of an antenna included in an antenna device according to an eleventh modified example of the embodiment.

[0142] 14A and 14B are diagrams showing an example of the configuration of a portion corresponding to one of the antennas included in the antenna device of the eleventh modified example. Fig. 14A is an exploded view, and Fig. 14B is a cross-sectional view. The cross section shown in Fig. 14B is a cross section of the antenna corresponding to the cross section of the substrate 120 taken along the arrow CC in Fig. 14A. The cross section taken along the arrow CC is a cross section parallel to the XZ plane passing on the -Y direction side of the center of the holder 123A in the Y direction.

[0143] The antenna device of the eleventh modified example includes a feed line 133K and a ground layer 132B that form a microstrip line, instead of the patch antenna 130. The feed line 133K is an example of a power feeding section. The antenna device of the eleventh modified example also includes an antenna element 140A, instead of the second antenna element 140. The antenna element 140A is an example of a radiating element. The substrate 120 is an example of a dielectric substrate.

[0144] The antenna element 140A has the same configuration as the second antenna element 140 of the antenna device 100 of the embodiment, and is disposed at the same position. That is, the antenna element 140A is disposed on the lower surface of the holder 123A of the substrate 120.

[0145] Since the antenna device of the eleventh modified embodiment does not include the patch antenna 130 having the first antenna element 131, each antenna included in the antenna device of the eleventh modified embodiment is constructed by one antenna element 140A.

[0146] The ground layer 132B is provided on the surface on the -Z direction side of the substrate 110, and the feed line 133K is provided on the surface on the +Z direction side of the substrate 110. On the surface on the +Z direction side of the substrate 110, the feed line 133K extends, for example, from the end on the -Y direction side at the center in the X direction toward the center of the substrate 110 in a planar view. The end on the +Y direction side of the feed line 133K is located directly below the outer edge extending in the X direction on the -Y direction side of the antenna element 140A in a planar view, and is separated from the antenna element 140A in the Z direction.

[0147] When power is supplied using such a power supply line 133K, the antenna element 140A can be excited in the Y direction, and can radiate vertically polarized radio waves.

[0148] In the antenna device of the eleventh modified embodiment, each antenna includes one antenna element 140A. Since the through hole 124 is provided around the antenna element 140A in a plan view, the effective relative dielectric constant of the components around the antenna element 140A can be reduced. Therefore, the mutual coupling between the antennas constructed with the antenna elements 140A can be reduced, and the gain of the antenna device can be increased. In addition, in the antenna device of the eleventh modified embodiment, since the through hole 124 is provided around the antenna element 140A in a plan view, the electric field leaking in the +Z direction is increased, and the electric field leaking in the X direction and Y direction is reduced, so that the mutual coupling between adjacent antennas can be reduced and the gain can be increased.

[0149] In addition, another feed line may be provided on the surface on the +Z direction side of the substrate 110 at the center in the Y direction, extending from the end on the -X direction side or the +X direction side toward the center in the plan view of the substrate 110, and the antenna element 140A may be excited in the X direction to radiate horizontally polarized radio waves. Such a feed line may be provided instead of the feed line 133K, or may be provided in addition to the feed line 133K.

[0150] <Twelfth Modification> 15A to 15C are diagrams showing an example of the configuration of an antenna included in an antenna device according to a twelfth modified example of the embodiment.

[0151] 15A to 15C are diagrams showing an example of the configuration of a portion corresponding to one of a plurality of antennas included in the antenna device of the twelfth modified example. FIG. 15A is an exploded view, and FIG. 15B and FIG. 15C are cross-sectional views. The cross section shown in FIG. 15B is a cross section of the antenna corresponding to a cross section parallel to the XZ plane passing through the through hole 132B1 of the ground layer 132B in FIG. 15A. The through hole 132B1 is offset toward the -Y direction side from the center of the ground layer 132B in a plan view. The cross section shown in FIG. 15C is a cross section of the antenna corresponding to a cross section parallel to the YZ plane passing through the through hole 132B1 of the ground layer 132B.

[0152] The antenna device of the twelfth modification has a configuration in which the microstrip line of the antenna device of the eleventh modification is changed to an L-type probe 133L. The L-type probe 133L is an example of a power feed section. Since the antenna device of the twelfth modification of the embodiment does not include a patch antenna 130 having a first antenna element 131, each antenna included in the antenna device of the twelfth modification of the embodiment is constructed by one antenna element 140A.

[0153] The ground layer 132B is provided on the surface on the +Z direction side of the substrate 110, and has a through hole 132B1 formed at a position offset from the center toward the -Y direction side. The substrate 110 has a through hole that communicates with the through hole 132B1 and passes through the substrate 110 in the Z direction. A portion of the L-shaped probe 133L parallel to the Z direction is inserted into the through hole 132B1 and the through hole of the substrate 110.

[0154] The portion of the L-shaped probe 133L parallel to the Y direction is bent perpendicularly in the +Y direction with respect to the portion parallel to the Z direction, and the tip is located directly below the outer edge extending in the X direction on the -Y direction side of the antenna element 140A in a planar view, and is spaced apart from the antenna element 140A in the Z direction.

[0155] Moreover, an end portion on the -Z direction side of a section of the L-type probe 133L parallel to the Z direction is connected to a power feed line 134L provided on the -Z direction side of the substrate 110. The power feed line 134L and the ground layer 132B form a microstrip line.

[0156] When power is fed using such an L-shaped probe 133L, the antenna element 140A can be excited in the Y direction, and vertically polarized radio waves can be emitted.

[0157] Like the antenna device of the 11th modification example, the antenna device of the twelfth modification example of the embodiment can reduce mutual coupling between antennas formed of the antenna elements 140A, and can increase the gain of the antenna device.

[0158] An L-type probe for horizontal polarization may be provided instead of the L-type probe 133L, or may be provided in addition to the L-type probe 133L.

[0159] <13th Modification> 16A and 16B are diagrams showing an example of the configuration of an antenna included in an antenna device according to a thirteenth modified example of the embodiment.

[0160] 16A and 16B are diagrams showing an example of the configuration of a portion corresponding to one of the antennas included in the antenna device of the thirteenth modified example. FIG. 16A is an exploded view, and FIG. 16B is a cross-sectional view. The cross section shown in FIG. 16B is a cross section of the antenna corresponding to a cross section passing through the through hole 132B1 for vertical polarization of the ground layer 132B in FIG. 16A and parallel to the XZ plane. The through hole 132B1 for vertical polarization is offset toward the -Y direction from the center of the ground layer 132B in a plan view. The through hole 132B2 for horizontal polarization is offset toward the -X direction from the center of the ground layer 132B in a plan view.

[0161] The antenna device of the 13th modified example has a configuration in which the L-shaped probe 133L of the antenna device of the 12th modified example is changed to a probe 133M. The probe 133M is an example of a power feeding section. Since the antenna device of the 13th modified example of the embodiment does not include a patch antenna 130 having a first antenna element 131, each antenna included in the antenna device of the 13th modified example of the embodiment is constructed by one antenna element 140A.

[0162] The ground layer 132B is provided on the surface on the +Z direction side of the substrate 110, and has a through hole 132B1 for vertical polarization formed at a position offset from the center toward the -Y direction, and a through hole 132B2 for horizontal polarization formed at a position offset from the center toward the -X direction. The substrate 110 has two through holes that communicate with the through holes 132B1 and 132B2 and pass through the substrate 110 in the Z direction. Two probes 133M are inserted through the through holes 132B1 and 132B2 and the two through holes of the substrate 110.

[0163] The tip of the vertically polarized probe 133M is connected to the surface on the -Z side of the antenna element 140A near the outer edge extending in the X direction on the -Y side of the antenna element 140A in a planar view. The tip of the horizontally polarized probe 133M is connected to the surface on the -Z side of the antenna element 140A near the outer edge extending in the Y direction on the -X side of the antenna element 140A in a planar view.

[0164] Further, the ends of the two probes 133M on the -Z direction side are connected to two feed lines 134M provided on the -Z direction side of the substrate 110. Each feed line 134M and the ground layer 132B form a microstrip line.

[0165] When power is fed using such a probe 133M, the antenna element 140A can be excited in the Y and X directions, and vertically and horizontally polarized radio waves can be emitted.

[0166] Like the antenna device of the 11th modified example, the antenna device of the thirteenth modified example of the embodiment can reduce mutual coupling between antennas formed of the antenna elements 140A, and can increase the gain of the antenna device.

[0167] In the thirteenth modification, the substrate 110 may be a metal substrate. In this case, the ground layer 132B is not necessary, and a connector or the like may be used instead of the power supply line 134M.

[0168] <14th Variation> 17A and 17B are diagrams showing an example of the configuration of an antenna included in an antenna device according to a fourteenth modified example of the embodiment.

[0169] 17A and 17B are diagrams showing an example of the configuration of a portion corresponding to one of the antennas included in the antenna device of the fourteenth modification. FIG. 17A is an exploded view, and FIG. 17B is a cross-sectional view. The cross-section shown in FIG. 17B is a cross-section of the antenna corresponding to a cross-section passing through the through-hole 132B1 for vertical polarization of the ground layer 132B in FIG. 17A and parallel to the XZ plane. The through-hole 132B1 for vertical polarization is offset toward the -Y direction from the center of the ground layer 132B in a plan view. The through-hole 132B2 for horizontal polarization is offset toward the -X direction from the center of the ground layer 132B in a plan view.

[0170] In the antenna device of the 14th modification, the substrate 110 of the antenna device 100 of the embodiment is changed to two-layer substrates 110A and 110B, and the first antenna element 131 is fed with power using two probes 133N instead of the vias 135H and 135V. The first antenna element 131 is provided on the surface of the substrate 110B in the +Z direction. In the antenna device of the 14th modification, the first antenna element 131 and the second antenna element 140 form an antenna.

[0171] The ground layer 132B is provided between the boards 110A and 110B (inner layer) and has a through hole 132B1 for vertical polarization formed at a position offset from the center toward the -Y direction side, and a through hole 132B2 for horizontal polarization formed at a position offset from the center toward the -X direction side. The boards 110A and 110B have two through holes that communicate with the through holes 132B1 and 132B2 and pass through the boards 110A and 110B in the Z direction. Two probes 133N are inserted through the through holes 132B1 and 132B2 and the two through holes of the boards 110A and 110B.

[0172] The tip of probe 133N for vertical polarization is connected to the surface on the -Z direction side of first antenna element 131 near the outer edge extending in the X direction on the -Y direction side of first antenna element 131 in a plan view. The tip of probe 133N for horizontal polarization is connected to the surface on the -Z direction side of first antenna element 131 near the outer edge extending in the Y direction on the -X direction side of first antenna element 131 in a plan view.

[0173] Further, the ends of the two probes 133N on the -Z direction side are connected to two power feed lines 134N provided on the -Z direction side of the substrate 110A. Each of the power feed lines 134N and the ground layer 132B constitute a microstrip line.

[0174] When power is supplied using such a probe 133N, the first antenna element 131 can be excited in the Y and X directions, and vertically and horizontally polarized radio waves can be emitted. The second antenna element 140 is disposed at a distance from the first antenna element 131 on the +Z direction side and is electromagnetically coupled to the first antenna element 131. Therefore, when the first antenna element 131 is excited, the second antenna element 140 is excited by the first antenna element 131. Therefore, the second antenna element 140 also emits vertically and horizontally polarized radio waves. If the first antenna element 131 and the second antenna element 140 are different in size, a wider band can be achieved.

[0175] The antenna device of the 14th variant of the embodiment, like the antenna device 100 of the embodiment, can reduce the mutual coupling between the antennas constructed of the first antenna element 131 and the second antenna element 140, and can increase the gain of the antenna device.

[0176] The second antenna element 140 may be provided on the surface of the substrate 120 on the +Z direction side.

[0177] The above describes an antenna device according to an exemplary embodiment of the present disclosure. However, the present disclosure is not limited to the specifically disclosed embodiment, and various modifications and variations are possible without departing from the scope of the claims. Regarding the above embodiment, the following supplementary notes are further disclosed. (Appendix 1) a first dielectric substrate having a first surface; a second dielectric substrate facing the first dielectric substrate; A plurality of first radiating elements provided on the first surface; A power supply section that supplies power to the first radiating element; a plurality of second radiating elements provided on a second surface of the second dielectric substrate and coupled to the plurality of first radiating elements; a through hole formed around the plurality of second radiating elements of the second dielectric substrate in a plan view; Including, The antenna device, wherein the first radiating elements are a plurality of antenna elements for a patch antenna. (Appendix 2) The antenna device described in Appendix 1, wherein the power supply section is a slot power supply section that supplies power at a distance from the first radiating element, a power supply line that supplies power at a distance from the first radiating element, an L-shaped probe that supplies power at a distance from the first radiating element, or a probe power supply that is connected to the first radiating element and supplies power. (Appendix 3) 2. The antenna device according to claim 1, wherein the second radiating elements are arranged at positions overlapping the antenna elements in a plan view. (Appendix 4) 4. The antenna device according to claim 3, wherein the shapes of the second radiating elements in a planar view are equal to the shapes of the antenna elements in a planar view. (Appendix 5) The second dielectric substrate is A plurality of the through holes are provided, 2. The antenna device according to claim 1, further comprising a plurality of beam portions extending between the plurality of through holes in a plan view and holding the plurality of second radiating elements. (Appendix 6) The beam portion has a plurality of holding portions each having a width greater than that of the other portions of the beam portion, The antenna device according to claim 5, wherein the second radiating elements are held by the holding portions, respectively. (Appendix 7) The plurality of second radiating elements are arranged along a first axis direction and a second axis direction in a plan view, 6. The antenna device according to claim 5, wherein the beam portions extend along the first axis direction or the second axis direction in a planar view. (Appendix 8) 8. The antenna device according to claim 7, wherein the first axis direction or the second axis direction is a direction perpendicular to an excitation direction of an electric field of the second radiating elements in a planar view. (Appendix 9) The antenna device according to claim 8, wherein the beam portions extend on a straight line connecting centers of the second radiating elements in the first axis direction or the second axis direction in a planar view. (Appendix 10) The plurality of second radiating elements are arranged along a first axis direction and a second axis direction in a plan view, 6. The antenna device according to claim 5, wherein the beam portions extend along a direction having an angle with respect to the first axis direction and the second axis direction in a plan view. (Appendix 11) The antenna device according to any one of claims 5 to 10, wherein the second dielectric substrate has a frame portion that is arranged along an outer edge of the second dielectric substrate in a planar view and is connected to the ends of the multiple beam portions on the outer edge side. (Appendix 12) 2. The antenna device according to claim 1, wherein the through holes are a plurality of through holes formed for each of the plurality of second radiating elements so as to surround a periphery of the second radiating element in a plan view. (Appendix 13) 5. The antenna device according to claim 1, further comprising a dielectric member having a relative dielectric constant lower than the relative dielectric constants of the first dielectric substrate and the second dielectric substrate, the dielectric member being provided between the first dielectric substrate and the second dielectric substrate or inside the through hole. (Appendix 14) A dielectric substrate; A plurality of radiating elements provided on a surface of the dielectric substrate; a through hole formed around the plurality of radiating elements of the dielectric substrate in a plan view; A power supply section that supplies power to the radiating element; 13. An antenna device comprising: (Appendix 15) The antenna device described in Appendix 14, wherein the power supply unit is a slot power supply unit that supplies power at a distance from the radiating element, a power supply line that supplies power at a distance from the radiating element, an L-shaped probe that supplies power at a distance from the radiating element, or a probe that is connected to the radiating element and supplies power. (Appendix 16) The dielectric substrate is A plurality of the through holes are provided, 15. The antenna device according to claim 14, further comprising a plurality of beam portions extending between the plurality of through holes in a plan view and holding the plurality of radiating elements. (Appendix 17) The beam portion has a plurality of holding portions each having a width greater than that of the other portions of the beam portion, 17. The antenna device according to claim 16, wherein the plurality of radiating elements are held by the plurality of holding portions, respectively. (Appendix 18) The plurality of radiating elements are arranged along a first axis direction and a second axis direction in a plan view, 17. The antenna device according to claim 15, wherein the beam portions extend along the first axis direction or the second axis direction in a plan view. (Appendix 19) 19. The antenna device according to claim 18, wherein the first axis direction or the second axis direction is a direction perpendicular to an excitation direction of the electric field of the plurality of radiating elements in a planar view. [Explanation of symbols]

[0178] 100, 100A, 100C~100J Antenna equipment 110 Substrate (an example of a first dielectric substrate) 111 Surface (an example of the first surface) 120 Substrate (an example of a second dielectric substrate) 121 Surface (an example of the second surface) 122 Frame 123X, 123Y beam section 123A Holding part 124 Through hole 130 Patch Antenna 130B Slot power supply 131 First antenna element (an example of a first radiating element, an example of multiple antenna elements for a patch antenna) 132 Ground Layer 140 Second antenna element (an example of a second radiating element) 150 Dielectric materials

Claims

1. a first dielectric substrate having a first surface; a second dielectric substrate facing the first dielectric substrate; A plurality of first radiating elements provided on the first surface; A power supply section that supplies power to the first radiating element; a plurality of second radiating elements provided on a second surface of the second dielectric substrate and coupled to the plurality of first radiating elements; a through hole formed around the plurality of second radiating elements of the second dielectric substrate in a plan view; Including, The antenna device, wherein the first radiating elements are a plurality of antenna elements for a patch antenna.

2. 2. The antenna device according to claim 1, wherein the power supply section is a slot power supply section that supplies power at a distance from the first radiating element, a power supply line that supplies power at a distance from the first radiating element, an L-shaped probe that supplies power at a distance from the first radiating element, or a probe power supply that is connected to the first radiating element and supplies power.

3. The antenna device according to claim 1 , wherein the second radiating elements are arranged at positions overlapping the antenna elements in a plan view.

4. The antenna device according to claim 3 , wherein the second radiating elements have a shape in a plan view that is equal to a shape of the antenna elements in a plan view.

5. The second dielectric substrate is A plurality of the through holes are provided, The antenna device according to claim 1 , further comprising a plurality of beam portions extending between the plurality of through holes in a plan view and holding the plurality of second radiating elements.

6. The beam portion has a plurality of holding portions each having a width greater than that of the other portions of the beam portion, The antenna device according to claim 5 , wherein the second radiating elements are held by the holding portions, respectively.

7. The second radiating elements are arranged along a first axis direction and a second axis direction in a plan view, The antenna device according to claim 5 , wherein the beam portions extend along the first axis direction or the second axis direction in a plan view.

8. The antenna device according to claim 7 , wherein the first axis direction or the second axis direction is a direction perpendicular to an excitation direction of an electric field of the second radiating elements in a plan view.

9. The antenna device according to claim 8 , wherein the beam portions extend on a straight line connecting centers of the second radiating elements in the first axis direction or the second axis direction in a plan view.

10. The second radiating elements are arranged along a first axis direction and a second axis direction in a plan view, The antenna device according to claim 5 , wherein the beam portions extend along a direction having an angle with respect to the first axis direction and the second axis direction in a plan view.

11. The antenna device according to claim 5 , wherein the second dielectric substrate has a frame portion that is provided along an outer edge of the second dielectric substrate in a planar view and is connected to ends of the beam portions on the outer edge side.

12. The antenna device according to claim 1 , wherein the through hole is a plurality of through holes formed for each of the plurality of second radiating elements so as to surround a periphery of the second radiating element in a plan view.

13. 5. The antenna device according to claim 1, further comprising a dielectric member provided between the first dielectric substrate and the second dielectric substrate or inside the through hole, the dielectric member having a relative dielectric constant lower than the relative dielectric constants of the first dielectric substrate and the second dielectric substrate.

14. A dielectric substrate; A plurality of radiating elements provided on a surface of the dielectric substrate; a through hole formed around the plurality of radiating elements in the dielectric substrate in a plan view; A power supply section that supplies power to the radiating element; 13. An antenna device comprising:

15. 15. The antenna device according to claim 14, wherein the power supply section is a slot power supply section that supplies power at a distance from the radiating element, a power supply line that supplies power at a distance from the radiating element, an L-shaped probe that supplies power at a distance from the radiating element, or a probe power supply that is connected to the radiating element and supplies power.

16. The dielectric substrate is A plurality of the through holes are provided, The antenna device according to claim 14 , further comprising a plurality of beam portions extending between the plurality of through holes in a plan view and supporting the plurality of radiating elements.

17. The beam portion has a plurality of holding portions each having a width greater than that of the other portions of the beam portion, The antenna device according to claim 16 , wherein the plurality of radiating elements are held by the plurality of holding portions, respectively.

18. The plurality of radiating elements are arranged along a first axis direction and a second axis direction in a plan view, The antenna device according to claim 16 , wherein the beam portions extend along the first axis direction or the second axis direction in a plan view.

19. The antenna device according to claim 18 , wherein the first axis direction or the second axis direction is a direction perpendicular to an excitation direction of an electric field of the plurality of radiating elements in a plan view.

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