Antenna device

Abstract

To sufficiently secure isolation between antennas in an antenna device in which a plurality of antenna conductor patterns are provided in a ground clearance region.SOLUTION: An antenna device 1 comprises: a ground conductor 3 which is formed on a surface of a substrate 2; antenna conductor patterns 10 and 20 disposed in a ground clearance region 4, in which the ground conductor 3 is not formed, on the surface of the substrate 2; and a capacitor C to which the antenna conductor pattern 10 and the antenna conductor pattern 20 are connected. The antenna conductor pattern 10 includes a radiation pattern R1 extending from a feeding point F1 in a Y direction. In a case where a wavelength of the antenna conductor pattern 10 in a resonant frequency on the substrate is defined as λ, the capacitor C is connected within a range of ±λ / 20 from a central position P of the radiation pattern R1 in the Y direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an antenna device, and more particularly to an antenna device including a plurality of antenna conductor patterns. [Background technology]

[0002] Patent Document 1 discloses a pattern antenna including a printed circuit board having a ground pattern, and an inverted-F-shaped antenna pattern and an inverted-L-shaped antenna pattern arranged on an end of the surface of the printed circuit board where the ground pattern is not provided. In Patent Document 1, a stub pattern is provided in the inverted-L-shaped antenna pattern to adjust the coupling between the inverted-F-shaped antenna pattern and the inverted-L-shaped antenna pattern. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-201278 Summary of the Invention [Problem to be solved by the invention]

[0004] However, by adjusting the coupling using a stub pattern, it is difficult to reduce the return loss while ensuring sufficient isolation between the antennas.

[0005] This disclosure describes a technique for reducing return loss while ensuring sufficient isolation between antennas in an antenna device in which multiple antenna conductor patterns are provided in a ground clearance area on a substrate. [Means for solving the problem]

[0006] An antenna device according to one aspect of the present disclosure includes a substrate, a ground conductor formed on a surface of the substrate, first and second antenna conductor patterns arranged on the surface of the substrate in a ground clearance area where the ground conductor is cut out, and a capacitive element connecting the first antenna conductor pattern and the second antenna conductor pattern, wherein the first antenna conductor pattern includes a first radiation pattern extending in a first direction from a first feed point, and where λ is the wavelength for a center frequency of an electromagnetic wave in wireless communication using the first antenna conductor pattern, the capacitive element is connected within a range of ±λ / 20 from a center position in the first direction of the first radiation pattern. [Effects of the Invention]

[0007] According to the present disclosure, a technique is provided for reducing return loss while ensuring sufficient isolation between antennas in an antenna device in which multiple antenna conductor patterns are provided in a ground clearance area on a substrate. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic plan view showing the appearance of an antenna device 1 according to an embodiment of the technology disclosed herein. [Figure 2] FIG. 2 is an enlarged view of the ground clearance area 4. [Figure 3] 3(a) to 3(c) are schematic diagrams for explaining several connection methods of the capacitive element C. FIG. [Figure 4] FIG. 4 is a graph showing the return loss of the antenna device 1. As shown in FIG. [Figure 5] FIG. 5 is a graph showing the isolation of the antenna device 1. As shown in FIG. [Figure 6] FIG. 6 is a graph showing the gain of the antenna device 1. As shown in FIG. [Figure 7] FIG. 7 is a graph showing the radiation efficiency of the antenna device 1. As shown in FIG. [Figure 8] FIG. 8 is a schematic plan view showing the appearance of an antenna device 1A according to a first comparative example. [Figure 9]FIG. 9 is a graph showing the return loss of the antenna device 1A. [Figure 10] FIG. 10 is a graph showing the isolation of the antenna device 1A. [Figure 11] FIG. 11 is a schematic plan view showing the appearance of an antenna device 1B according to a second comparative example. [Figure 12] FIG. 12 is a graph showing the return loss of the antenna device 1B. [Figure 13] FIG. 13 is a graph showing the isolation of the antenna device 1B. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the technology according to the present disclosure will be described in detail with reference to the accompanying drawings.

[0010] FIG. 1 is a schematic plan view showing the appearance of an antenna device 1 according to an embodiment of the technology disclosed herein.

[0011] As shown in Fig. 1, the antenna device 1 according to this embodiment includes a substrate 2 made of an insulating material such as resin, a ground conductor 3 formed on the surface of the substrate 2, and antenna conductor patterns 10 and 20 arranged in a ground clearance region 4 on the surface of the substrate 2, where the ground conductor 3 is cut away. The ground clearance region 4 is a region where the ground conductor 3 is not formed. In the example shown in Fig. 1, most of the surface of the substrate 2 is covered with the ground conductor 3. The antenna conductor pattern 10 is, for example, a first antenna conductor pattern, and the antenna conductor pattern 20 is, for example, a second antenna conductor pattern. The antenna conductor pattern 10 and the antenna conductor pattern 20 are arranged side by side in the X direction.

[0012] FIG. 2 is an enlarged view of the ground clearance area 4.

[0013] As shown in FIG. 2 , the ground clearance region 4 is an area surrounded by an edge 2X of the substrate 2 extending in the X direction, an edge 2Y of the substrate 2 extending in the Y direction, an edge 3X of the ground conductor 3 extending in the X direction, and an edge 3Y of the ground conductor 3 extending in the Y direction. The ground clearance region 4 is a rectangular area defined by the edges 2X and 2Y of the substrate and the edges 3X and 3Y of the ground conductor 3. The Y direction is, for example, a first direction, and the X direction is, for example, a second direction. The edge 3Y is, for example, a first edge of the ground conductor 3, and the edge 3X is, for example, a second edge of the ground conductor 3. In this way, in the example shown in FIG. 2 , the ground clearance region 4 is surrounded by the ground conductor 3 on one side in the X direction and one side in the Y direction. However, the ground clearance region 4 may be surrounded by the ground conductor 3 on three sides. For example, the ground clearance region 4 may be surrounded by the ground conductor 3 on one side in the X direction and both sides in the Y direction.

[0014] The antenna conductor pattern 10 includes a conductor pattern 11 and a radiation pattern R1. One end of the conductor pattern 11 in the Y direction is connected to a feed point F1 located at an edge 3X of the ground conductor 3, and the other end of the conductor pattern 11 in the Y direction is connected to the radiation pattern R1 via an inductance element L1. The conductor pattern 11 is, for example, a first conductor pattern, the radiation pattern R1 is, for example, a first radiation pattern, the inductance element L1 is, for example, a first inductance element, and the feed point F1 is, for example, a first feed point. The inductance element L1 may be a two-terminal chip component mounted on the substrate 2, or may be a conductor pattern on the substrate 2.

[0015] Radiation pattern R1 has an open end 12 located on the opposite side of feed point F1 in the Y direction. In the example shown in FIG. 2, open end 12 extends linearly in the X direction. Edge 13 of radiation pattern R1, which connects the end of open end 12 on the −X direction side to the connection connected to inductance element L1, has a convex curved shape. That is, starting from the end of open end 12 on the −X direction side, the position of edge 13 gradually displaces in the −X direction toward the connection connected to inductance element L1, and the position of edge 13 gradually displaces in the +X direction from the portion of edge 13 located furthest in the −X direction toward the connection connected to inductance element L1. The amount of displacement of edge 13 in the X direction per unit Y position gradually decreases from the end of open end 12 on the −X direction side toward the portion of edge 13 located furthest in the −X direction and gradually increases from the portion of edge 13 located furthest in the −X direction toward the connection connected to inductance element L1. The portion of edge 13 located closest to the -X direction may be the center position of radiation pattern R1 in the Y direction. In contrast, in the example shown in Fig. 2, edge 14 of radiation pattern R1 connecting the end of open end 12 on the +X direction side and the connection part connected to inductance element L1 extends linearly in the Y direction.

[0016] As a result, the radiation pattern R1 has a shape including a region R1a located on the -Y direction side, whose width in the X direction gradually increases from the feed point F1 toward the center position of the radiation pattern R1 in the Y direction, and a region R1b whose width in the X direction gradually decreases from the center position of the radiation pattern R1 in the Y direction toward the open end 12. This shape enables the radiation pattern R1 to achieve good characteristics as an antenna for a UWB (Ultra Wide Band) system. Although it is not essential to use the inductance element L1 in the antenna conductor pattern 10, using the inductance element L1 makes it possible to reduce the size of the radiation pattern R1 and the return loss.

[0017] The antenna conductor pattern 20 includes a conductor pattern 22 extending in the −X direction from a feed point F2 located at an edge 3Y of the ground conductor 3 toward the antenna conductor pattern 10, a conductor pattern 23 extending in the −Y direction from an end of the conductor pattern 22 in the −X direction toward the edge 3X of the ground conductor 3, and a radiation pattern R2 extending in the +Y direction from the connection point between the conductor pattern 22 and the conductor pattern 23 toward the side opposite the edge 3X of the ground conductor 3. The conductor pattern 22 is, for example, a second conductor pattern, the conductor pattern 23 is, for example, a third conductor pattern, the radiation pattern R2 is, for example, a second radiation pattern, and the feed point F2 is, for example, a second feed point. The end of the conductor pattern 23 in the −Y direction may be connected to the edge 3X of the ground conductor 3.

[0018] In the example shown in FIG. 2, the pattern widths of the conductor patterns 22 and 23 and the radiation pattern R2 that constitute the antenna conductor pattern 20 are substantially constant and are wider than the pattern width of the conductor pattern 11 included in the antenna conductor pattern 10.

[0019] In the example shown in FIG. 2, an inductance element L2 is arranged with one end connected to the radiation pattern R2 and the other end connected to the connection point between the conductor pattern 22 and the conductor pattern 23. The inductance element L2 may be a two-terminal chip component mounted on the substrate 2, or may be a conductor pattern on the substrate 2. The inductance of the inductance element L2 may be larger than the inductance of the inductance element L1. In this case, using a two-terminal chip component as the inductance element L2 makes it possible to ensure sufficient inductance. Although it is not essential to use the inductance element L2 in the antenna conductor pattern 20, using the inductance element L2 makes it possible to reduce the size of the radiation pattern R2 and the return loss.

[0020] The radiation pattern R2 includes a first portion R2a extending in the +Y direction from the inductance element L2, and a second portion R2b extending in the +X direction from the tip of the first portion R2a in the +Y direction toward the edge 3Y of the ground conductor 3. The tip of the second portion R2b in the +X direction is spaced apart from the edge 3Y of the ground conductor 3.

[0021] With this shape, the antenna conductor pattern 20 forms an inverted-F antenna, which can obtain good characteristics as an antenna for Bluetooth (registered trademark). Although it is not essential that the radiation pattern R2 has a bent shape consisting of the first portion R2a and the second portion R2b, by using such a bent shape, the length of the radiation pattern R2 in the Y direction can be shortened.

[0022] Furthermore, the antenna device 1 according to this embodiment includes a capacitance element C connecting the antenna conductor pattern 10 and the antenna conductor pattern 20. The capacitance element C may be a two-terminal chip component mounted on the substrate 2, or may be a conductor pattern on the substrate 2. One end of the capacitance element C is connected to the radiation pattern R1 of the antenna conductor pattern 10, and the other end of the capacitance element C is connected to the connection point between the conductor pattern 22 and the conductor pattern 23 of the antenna conductor pattern 20. The connection point between the conductor pattern 22 and the conductor pattern 23 is located between the inductance element L2 and the feed point F2.

[0023] The capacitance element C plays a role in canceling the inductive coupling that occurs when the antenna conductor pattern 10 and the antenna conductor pattern 20 are adjacent to each other. This reduces the inductive coupling between the antenna conductor pattern 10 and the antenna conductor pattern 20, thereby improving the isolation between the antenna conductor pattern 10 and the antenna conductor pattern 20. The effect of the capacitance element C is maximized by connecting the capacitance element C to the center position P of the radiation pattern R1 in the X direction. However, it is not essential to connect the capacitance element C to the center position P. If the wavelength of the electromagnetic wave corresponding to the center frequency in wireless communication using the antenna conductor pattern 10 is λ, the effect of the capacitance element C can be fully exhibited by connecting the capacitance element C within a range of ±λ / 20 from the center position P of the radiation pattern R1 in the X direction. The portion of the radiation pattern R1 where the width in the X direction is greatest may also be located within a range of ±λ / 20 from the center position P.

[0024] As an example, if the length of the radiation pattern R1 in the Y direction is 7.4 mm and λ is 41 mm, connecting the capacitance element C within a range of ±2.05 mm from the center position P can have the effect of canceling inductive coupling.

[0025] One end and the other end of the capacitance element C may be directly connected to the antenna conductor patterns 10 and 20, respectively, or may be connected via a connection pattern 30. For example, as shown in FIG. 3(a), a connection pattern 30 extending in the X direction may be provided on the antenna conductor pattern 10, and the capacitance element C may be connected between the connection pattern 30 and the antenna conductor pattern 20. Alternatively, as shown in FIG. 3(b), a connection pattern 30 extending in the X direction may be provided on the antenna conductor pattern 20, and the capacitance element C may be connected between the connection pattern 30 and the antenna conductor pattern 10. Alternatively, as shown in FIG. 3(c), connection patterns 31 and 32 extending in the X direction may be provided on both the antenna conductor pattern 10 and the antenna conductor pattern 20, respectively, and the capacitance element C may be connected between the connection pattern 31 and the connection pattern 32.

[0026] The pattern width of the connection patterns 30 to 32 may be narrower than the pattern width of the antenna conductor pattern 20. This makes it possible to suppress the influence of the connection patterns 30 to 32 on the characteristics of the antenna conductor patterns 10 and 20.

[0027] 4 to 7 are graphs showing the characteristics of the antenna device 1 according to this embodiment. In each of Figs. 4, 6, and 7, (a) shows the characteristics of the antenna conductor pattern 20, and (b) shows the characteristics of the antenna conductor pattern 10. Fig. 5(a) shows the characteristics of the antenna conductor patterns 10 and 20, and (b) shows the characteristics of the antenna conductor pattern 20. Here, Fig. 4 shows the return loss, Fig. 5 shows the isolation, Fig. 6 shows the gain, and Fig. 7 shows the radiation efficiency. The band of the antenna conductor pattern 20 is 2.4 to 2.484 GHz, and the band of the antenna conductor pattern 10 is 6.2 to 8.3 GHz. As shown in Figs. 4 to 7, the antenna device 1 according to this embodiment has good return loss, isolation, gain, and radiation efficiency for both the antenna conductor patterns 10 and 20.

[0028] FIG. 8 is a schematic plan view showing the appearance of an antenna device 1A according to a first comparative example.

[0029] 8, the antenna device 1A according to the first comparative example differs from the antenna device 1 according to the above embodiment in that the capacitance element C is connected near the end of the radiation pattern R1 on the -Y direction side. In the antenna device 1A according to the first comparative example, the capacitance element C is connected outside the range of ±λ / 20 from the central position P.

[0030] 9 and 10 are graphs showing the characteristics of the antenna device 1A according to the first comparative example. Of these, Fig. 9(a) shows the return loss of the antenna conductor pattern 20, Fig. 9(b) shows the return loss of the antenna conductor pattern 10, and Fig. 10 shows the isolation between the antenna conductor patterns 10 and 20. As shown in Fig. 9 and 10, the antenna device 1A according to the first comparative example is good in terms of the return loss of the antenna conductor pattern 20 and the isolation between the antenna conductor patterns 10 and 20, but the return loss of the antenna conductor pattern 10 is inferior to that of the antenna device 1 according to the above embodiment.

[0031] FIG. 11 is a schematic plan view showing the appearance of an antenna device 1B according to a second comparative example.

[0032] 11, the antenna device 1B according to the second comparative example differs from the antenna device 1 according to the above embodiment in that the capacitance element C is connected near the end of the radiation pattern R1 on the +Y direction side. In the antenna device 1B according to the second comparative example, the capacitance element C is connected outside the range of ±λ / 20 from the central position P.

[0033] Figures 12 and 13 are graphs showing the characteristics of an antenna device 1B according to a second comparative example. Of these, Figure 12(a) shows the return loss of the antenna conductor pattern 20, Figure 12(b) shows the return loss of the antenna conductor pattern 10, and Figure 13 shows the isolation between the antenna conductor patterns 10 and 20. As shown in Figures 12 and 13, the antenna device 1B according to the second comparative example has good isolation between the antenna conductor patterns 10 and 20, but the return loss of the antenna conductor patterns 10 and 20 is inferior to that of the antenna device 1 according to the above embodiment.

[0034] As described above, the antenna device 1 according to this embodiment has a configuration in which the antenna conductor patterns 10 and 20 having different resonant frequencies are provided in the ground clearance area 4, and the capacitive element C connecting the antenna conductor patterns 10 and 20 is inserted within a range of ±λ / 20 from the central position P, thereby canceling the inductive coupling occurring between the antenna conductor patterns 10 and 20. This makes it possible to ensure high isolation while satisfying various characteristics such as return loss, gain, and radiation efficiency.

[0035] The above describes embodiments of the technology according to the present disclosure, but the technology according to the present disclosure is not limited to the above embodiments, and various modifications are possible within the scope of the gist of the technology, and it goes without saying that these modifications are also included within the scope of the technology according to the present disclosure.

[0036] The technology according to the present disclosure includes, but is not limited to, the following configuration examples.

[0037] An antenna device according to one aspect of the present disclosure includes a substrate, a ground conductor formed on a surface of the substrate, first and second antenna conductor patterns arranged on the surface of the substrate in a ground clearance area where the ground conductor is cut out, and a capacitive element connecting the first antenna conductor pattern and the second antenna conductor pattern. The first antenna conductor pattern includes a first radiation pattern extending in a first direction from a first feed point. When λ is the wavelength of the center frequency of the electromagnetic wave in wireless communication using the first antenna conductor pattern, the capacitive element is connected within a range of ±λ / 20 from the center position of the first radiation pattern in the first direction. This cancels inductive coupling between the first antenna conductor pattern and the second antenna conductor pattern, thereby improving isolation between the first antenna conductor pattern and the second antenna conductor pattern. Furthermore, since the capacitive element is connected within a range of ±λ / 20 from the center position of the first radiation pattern in the first direction, excellent return loss characteristics can be obtained. Therefore, an antenna device can be obtained that satisfies the return loss characteristics while ensuring sufficient isolation between the antennas.

[0038] In the above antenna device, the ground clearance region may be a region surrounded by a first edge of the ground conductor extending in a first direction, a second edge of the ground conductor extending in a second direction perpendicular to the first direction, and an edge of the substrate, which makes it possible to arrange the first and second antenna conductor patterns near the edge of the substrate, thereby facilitating the miniaturization of the entire antenna device.

[0039] In the above antenna device, the first radiation pattern may have an open end located on the opposite side of the first feed point in the first direction, and the first radiation pattern may include a region whose width in the second direction gradually increases from the first feed point toward a central position, and a region whose width in the second direction gradually decreases from the central position toward the open end. This makes it possible to broaden the bandwidth of the first radiation pattern.

[0040] In the above antenna device, the portion of the first radiation pattern where the width in the second direction is greatest may be located within a range of ±λ / 20 from the center position, thereby making it possible to further broaden the bandwidth of the first radiation pattern.

[0041] In the above antenna device, the first antenna conductor pattern may further include a first conductor pattern connected to the first feeding point, and a first inductance element may be connected between the first conductor pattern and the first radiation pattern, thereby reducing the return loss of the first antenna conductor pattern.

[0042] In the above antenna device, the second antenna conductor pattern may include a second conductor pattern extending in a second direction from the second feed point toward the first antenna conductor pattern, a third conductor pattern extending in a first direction from the second conductor pattern toward the second edge of the ground conductor, and a second radiation pattern extending in the first direction from the connection point between the second conductor pattern and the third conductor pattern toward the side of the ground conductor opposite to the second edge, thereby improving the radiation efficiency of the second antenna conductor pattern.

[0043] The antenna device may further include a second inductance element connected to the second radiation pattern, thereby reducing the return loss of the second antenna conductor pattern.

[0044] In the above antenna device, one end of the capacitance element may be connected to the first radiation pattern, and the other end of the capacitance element may be connected between the second inductance element and the second feed point, thereby making it possible to adjust the return losses of the first and second antenna conductor patterns and the isolation between the first and second antenna conductor patterns.

[0045] In the above antenna device, the second inductance element may be a two-terminal chip component mounted on a substrate and having first and second terminals, the first terminal of the second inductance element being connected to the second radiation pattern and the second terminal of the second inductance element being connected to a connection point between the second conductor pattern and the third conductor pattern. This makes it possible to obtain a sufficient inductance value despite the small size and reduce variation in the inductance value.

[0046] In the above antenna device, one end of the capacitive element may be connected to the first radiation pattern, and the other end of the capacitive element may be connected to a connection point between the second conductor pattern and the third conductor pattern, thereby making it possible to adjust the return losses of the first and second antenna conductor patterns and the isolation between the first and second antenna conductor patterns.

[0047] In the above antenna device, the second radiation pattern may include a first portion extending in a first direction and a second portion extending in a second direction from a tip of the first portion toward a first edge of the ground conductor, which makes it possible to reduce the size of the antenna device while suppressing the influence of the second antenna conductor pattern on the radiation characteristics of the first antenna conductor pattern.

[0048] In the above antenna device, the third conductor pattern may be connected to a second edge of the ground conductor, whereby the second antenna conductor pattern forms an inverted-F antenna.

[0049] In the above antenna device, at least one of the first antenna conductor pattern and the second antenna conductor pattern has a connection pattern, the capacitance element is connected to the first antenna conductor pattern or the second antenna conductor pattern via the connection pattern, and the pattern width of the connection pattern may be narrower than the pattern width of the second antenna conductor pattern, thereby making it possible to suppress the influence of the connection pattern on the antenna characteristics. [Explanation of symbols]

[0050] 1, 1A, 1B Antenna Device 2 boards 2X, 2Y board edge 3 Ground Conductor 3X, 3Y Ground conductor edges 4. Ground Clearance Area 10,20 Antenna conductor pattern 11, 22, 23 Conductor pattern 12 Open end 13,14 Radiation pattern edges 30~32 Connection Pattern C Capacitor element F1, F2 feeding points L reverse L1, L2 inductance elements P center position R1,R2 radiation pattern R1a,R1b area

Claims

1. A substrate; a ground conductor formed on a surface of the substrate; a first antenna conductor pattern and a second antenna conductor pattern disposed on a surface of the substrate in a ground clearance area where the ground conductor is cut out; a capacitive element connecting the first antenna conductor pattern and the second antenna conductor pattern; Equipped with the first antenna conductor pattern includes a first radiation pattern extending in a first direction from a first feed point; where λ is a wavelength corresponding to a center frequency of an electromagnetic wave in wireless communication using the first antenna conductor pattern, the capacitive element is connected within a range of ±λ / 20 from a center position of the first radiation pattern in the first direction. Antenna device.

2. the ground clearance region is a region surrounded by a first edge of the ground conductor extending in the first direction, a second edge of the ground conductor extending in a second direction perpendicular to the first direction, and an edge of the substrate. The antenna device according to claim 1 .

3. the first radiation pattern has an open end located opposite the first feed point in the first direction; the first radiation pattern includes a region whose width in the second direction gradually increases from the first feed point toward the central position, and a region whose width in the second direction gradually decreases from the central position toward the open end. The antenna device according to claim 2 .

4. a portion of the first radiation pattern where the width in the second direction is maximum is located within a range of ±λ / 20 from the central position; The antenna device according to claim 3 .

5. the first antenna conductor pattern further includes a first conductor pattern connected to the first feeding point; a first inductance element is connected between the first conductor pattern and the first radiation pattern; The antenna device according to claim 1 .

6. the second antenna conductor pattern includes a second conductor pattern extending in the second direction from a second feeding point toward the first antenna conductor pattern, a third conductor pattern extending in the first direction from the second conductor pattern toward the second edge of the ground conductor, and a second radiation pattern extending in the first direction from a connection point between the second conductor pattern and the third conductor pattern toward a side of the ground conductor opposite to the second edge. The antenna device according to claim 2 .

7. further comprising a second inductance element connected to the second radiation pattern; 7. The antenna device according to claim 6.

8. one end of the capacitive element is connected to the first radiation pattern; the other end of the capacitance element is connected between the second inductance element and the second feeding point.

8. The antenna device according to claim 7.

9. the second inductance element is a two-terminal chip component mounted on the substrate and having first and second terminals, the first terminal of the second inductance element is connected to the second radiation pattern; the second terminal of the second inductance element is connected to a connection point between the second conductor pattern and the third conductor pattern; 9. The antenna device according to claim 8.

10. one end of the capacitive element is connected to the first radiation pattern; the other end of the capacitive element is connected to a connection point between the second conductor pattern and the third conductor pattern; 7. The antenna device according to claim 6.

11. the second radiation pattern includes a first portion extending in the first direction and a second portion extending in the second direction from a tip of the first portion toward the first edge of the ground conductor.

7. The antenna device according to claim 6.

12. the third conductor pattern is connected to the second edge of the ground conductor.

7. The antenna device according to claim 6.

13. At least one of the first antenna conductor pattern and the second antenna conductor pattern has a connection pattern, the capacitance element is connected to the first antenna conductor pattern or the second antenna conductor pattern via the connection pattern; a pattern width of the connection pattern being narrower than a pattern width of the second antenna conductor pattern; The antenna device according to any one of claims 1 to 12.

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