Antenna device

Abstract

The present invention addresses the problem of sufficiently ensuring isolation between antennas in an antenna device in which a plurality of antenna conductor patterns are provided in a ground gap region. This antenna device (1) is provided with: a ground conductor (3) that is formed on the surface of a substrate (2); antenna conductor patterns (10, 20) that are arranged on the surface of the substrate (2) and that do not form a ground gap region (4) in which the ground conductor (3) is formed; and a capacitor element (C) that connects the antenna conductor pattern (10) and the antenna conductor pattern (20). The antenna conductor pattern (10) includes a radiation pattern (R1) extending in the Y direction from the feed point (F1). When the wavelength on the substrate at the resonance frequency of the antenna conductor pattern (10) is lambda, the capacitor element (C) is connected within the range of + / -lambda / 20 from the center position (P) in the Y direction of the radiation pattern (R1).

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 Art

[0002] Patent Document 1 discloses a pattern antenna comprising: a printed circuit board having a ground pattern; and an inverted-F antenna pattern and an inverted-L antenna pattern arranged at an end of the printed circuit board's surface where the ground pattern is not provided. Patent Document 1 adjusts the coupling between the inverted-F and inverted-L antenna patterns by providing a stub pattern in the inverted-L antenna pattern.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2004-201278 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] However, it is difficult to reduce return loss and ensure sufficient isolation between antennas by adjusting the coupling using the stub pattern.

[0008] The present disclosure describes a technique for reducing return loss and ensuring sufficient isolation between antennas in an antenna device having a plurality of antenna conductor patterns provided in a ground gap region on a substrate.

[0009] Technical solutions to solve problems

[0010] An antenna device according to one aspect of the present disclosure includes: a substrate; a ground conductor formed on a surface of the substrate; a first antenna conductor pattern and a second antenna conductor pattern arranged on the surface of the substrate in a ground gap region where the ground conductor is interrupted; and a capacitor 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 from a first feed point in a first direction, and wherein, when the wavelength of electromagnetic waves relative to a center frequency of wireless communication using the first antenna conductor pattern is λ, the capacitor element is connected within a range of ±λ / 20 from a center position in the first direction of the first radiation pattern.

[0011] Effects of the Invention

[0012] According to the present disclosure, a technology is provided for reducing return loss and ensuring sufficient isolation between antennas in an antenna device having a plurality of antenna conductor patterns provided in a ground gap region on a substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic plan view showing the appearance of an antenna device 1 according to one embodiment of the technology disclosed herein.

[0014] Figure 2 It is an enlarged view of the ground gap area 4.

[0015] Figure 3 (a)~ Figure 3 (c) is a schematic diagram for explaining some connection methods of the capacitor element C.

[0016] Figure 4 It is a graph showing the return loss of the antenna device 1 .

[0017] Figure 5 It is a graph showing the isolation of the antenna device 1 .

[0018] Figure 6 It is a graph showing the gain of the antenna device 1 .

[0019] Figure 7 It is a graph showing the radiation efficiency of the antenna device 1 .

[0020] Figure 8 It is a schematic plan view showing the appearance of an antenna device 1A according to a first comparative example.

[0021] Figure 9 It is a graph showing the return loss of the antenna device 1A.

[0022] Figure 10 It is a graph showing the isolation of the antenna device 1A.

[0023] Figure 11 It is a schematic plan view showing the appearance of an antenna device 1B according to a second comparative example.

[0024] Figure 12 It is a graph showing the return loss of the antenna device 1B.

[0025] Figure 13 It is a graph showing the isolation of the antenna device 1B.

[0026] Description of Reference Numerals

[0027] 1. 1A and 1B antenna devices

[0028] 2 substrates

[0029] Edges of 2X and 2Y substrates

[0030] 3 grounding conductor

[0031] Edges of 3X and 3Y grounding conductors

[0032] 4Ground clearance area

[0033] 10, 20 antenna conductor pattern

[0034] 11, 22, 23 conductor patterns

[0035] 12 open end

[0036] 13, 14 Radial pattern edges

[0037] 30~32 connection pattern

[0038] C capacitor element

[0039] F1, F2 power supply points

[0040] L inverse

[0041] L1, L2 inductor components

[0042] P Central Position

[0043] R1, R2 radial pattern

[0044] R1a and R1b regions DETAILED DESCRIPTION

[0045] Hereinafter, embodiments of the technology disclosed herein will be described in detail with reference to the accompanying drawings.

[0046] Figure 1 It is a schematic plan view showing the appearance of an antenna device 1 according to one embodiment of the technology disclosed herein.

[0047] like Figure 1 As shown, the antenna device 1 of 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 on the surface of the substrate 2 and having a ground gap area 4 where the ground conductor is cut off 3. The ground gap area 4 is an area where the ground conductor 3 is not formed. Figure 1 In the example shown, most of the surface of the substrate 2 is covered by 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 patterns 10 and 20 are arranged side by side in the X direction.

[0048] Figure 2 It is an enlarged view of the ground gap area 4.

[0049] like Figure 2As shown, the ground gap area 4 is an area surrounded by the edge 2X of the substrate 2 extending in the X direction, the edge 2Y of the substrate 2 extending in the Y direction, the edge 3X of the ground conductor 3 extending in the X direction, and the edge 3Y of the ground conductor 3 extending in the Y direction. The ground gap area 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, the first direction, and the X direction is, for example, the second direction. The edge 3Y is, for example, the first edge of the ground conductor 3, and the edge 3X is, for example, the second edge of the ground conductor 3. In this way, Figure 2 In the illustrated example, the ground gap area 4 is surrounded by the ground conductor 3 from one side in the X direction and one side in the Y direction. However, the ground gap area 4 may be surrounded by the ground conductor 3 from three directions. As an example, the ground gap area 4 may be surrounded by the ground conductor 3 from one side in the X direction and from both sides in the Y direction.

[0050] The antenna conductor pattern 10 includes a conductor pattern 11 and a radiating pattern R1. One end of the conductor pattern 11 in the Y direction is connected to a feed point F1 located at the edge 3X of the ground conductor 3, and the other end in the Y direction is connected to the radiating pattern R1 via an inductor element L1. The conductor pattern 11 is, for example, a first conductor pattern, the radiating pattern R1 is, for example, a first radiating pattern, the inductor element L1 is, for example, a first inductor element, and the feed point F1 is, for example, a first feed point. The inductor element L1 may be a two-terminal chip component mounted on the substrate 2 or a conductor pattern on the substrate 2.

[0051] The radiation pattern R1 has an open end 12 located on the opposite side of the feed point F1 in the Y direction. Figure 2 In the example shown, the open end 12 extends straight along the X direction. The edge 13 of the radiation pattern R1 connecting the end of the open end 12 on the -X direction side and the connection portion connected to the inductor element L1 has a convex curved shape. That is, when the end of the open end 12 on the -X direction side is set as the starting point, the position of the edge 13 gradually shifts in the -X direction toward the connection portion connected to the inductor element L1, and the position of the edge 13 gradually shifts in the +X direction from the portion of the edge 13 located closest to the -X direction side toward the connection portion connected to the inductor element L1. The displacement amount of the X direction position of the edge 13 relative to the unit Y direction position gradually decreases from the end of the open end 12 on the -X direction side toward the portion of the edge 13 located closest to the -X direction side, and gradually increases from the portion of the edge 13 located closest to the -X direction side toward the connection portion connected to the inductor element L1. The portion of the edge 13 located closest to the -X direction side may also be the center position of the radiation pattern R1 in the Y direction. In contrast, in Figure 2In the illustrated example, an edge 14 of the radiation pattern R1 connecting the end portion of the open end 12 on the +X direction side and the connection portion to the inductance element L1 extends linearly in the Y direction.

[0052] As a result, radiation pattern R1 has a shape that includes region R1a, located on the -Y side, and region R1b. Region R1a's width in the X direction gradually increases from feed point F1 toward the center of radiation pattern R1 in the Y direction, while the width in the X direction of region R1b gradually decreases from the center of radiation pattern R1 in the Y direction toward open end 12. This shape enables radiation pattern R1 to achieve excellent characteristics as an antenna for UWB (Ultra Wide Band) systems. While the antenna conductor pattern 10 does not necessarily require the use of inductor element L1, its use can reduce the size of radiation pattern R1 and reduce return loss.

[0053] 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 an 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 opposite side of the edge 3X of the ground conductor 3. The conductor pattern 22 is, for example, the second conductor pattern, the conductor pattern 23 is, for example, the third conductor pattern, the radiation pattern R2 is, for example, the second radiation pattern, and the feed point F2 is, for example, the 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.

[0054] exist Figure 2 In the illustrated example, the pattern widths of the conductor patterns 22 and 23 and the radiation pattern R2 constituting 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 .

[0055] exist Figure 2 In the example shown, an inductor element L2 is configured, one end of which is connected to the radiation pattern R2 and the other end of which is connected to the connection point between the conductor pattern 22 and the conductor pattern 23. The inductor element L2 can be a two-terminal chip component mounted on the substrate 2, or it can be a conductor pattern on the substrate 2. The inductance of the inductor element L2 can also be greater than the inductance of the inductor element L1. In this case, using a two-terminal chip component as the inductor element L2 ensures sufficient inductance. While the antenna conductor pattern 20 does not necessarily require the inductor element L2, using it can reduce the size of the radiation pattern R2 and reduce return loss.

[0056] Radiation pattern R2 includes a first portion R2a extending in the +Y direction from inductor element L2, and a second portion R2b extending in the +X direction from the leading end of first portion R2a in the +Y direction toward edge 3Y of ground conductor 3. The leading end of second portion R2b in the +X direction is spaced apart from edge 3Y of ground conductor 3.

[0057] With this shape, antenna conductor pattern 20 forms an inverted-F antenna, achieving excellent characteristics as a Bluetooth (registered trademark) antenna. While it is not essential that radiation pattern R2 be formed into a folded shape consisting of first portion R2a and second portion R2b, such a folded shape can shorten the length of radiation pattern R2 in the Y direction.

[0058] Furthermore, the antenna device 1 of this embodiment includes a capacitor element C that connects the antenna conductor pattern 10 and the antenna conductor pattern 20. The capacitor 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 capacitor element C is connected to the radiation pattern R1 of the antenna conductor pattern 10, and the other end of the capacitor 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 inductor element L2 and the feed point F2.

[0059] Capacitor element C cancels the inductive coupling caused by the adjacent arrangement of antenna conductor patterns 10 and 20. This reduces inductive coupling between antenna conductor patterns 10 and 20, improving isolation between them. The effect of capacitor element C is maximized by connecting capacitor element C at center position P in the X direction of radiation pattern R1. However, connecting capacitor element C at center position P is not essential. If the wavelength of electromagnetic waves relative to the center frequency of wireless communication using antenna conductor pattern 10 is λ, the effect of capacitor element C can be maximized by connecting capacitor element C within a range of ±λ / 20 from center position P in the X direction of radiation pattern R1. The portion of radiation pattern R1 with its largest width in the X direction may also be located within a range of ±λ / 20 from center position P.

[0060] As an example, when the length of the radiation pattern R1 in the Y direction is 7.4 mm and λ is 41 mm, the effect of canceling inductive coupling is achieved by connecting the capacitive element C within a range of ±2.05 mm from the center position P.

[0061] One end and the other end of the capacitor element C may be directly connected to the antenna conductor patterns 10 and 20, respectively, or may be connected via the connection pattern 30. For example, Figure 3As shown in (a), a connection pattern 30 extending in the X direction is provided on the antenna conductor pattern 10, and a capacitance element C is connected between the connection pattern 30 and the antenna conductor pattern 20. Figure 3 As shown in (b), a connection pattern 30 extending in the X direction is provided on the antenna conductor pattern 20, and a capacitance element C is connected between the connection pattern 30 and the antenna conductor pattern 10. Alternatively, as Figure 3 As shown in (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 a capacitive element C may be connected between the connection pattern 31 and the connection pattern 32.

[0062] The pattern widths of the connection patterns 30 to 32 may be narrower than the pattern width of the antenna conductor pattern 20 . This can suppress the influence of the connection patterns 30 to 32 on the characteristics of the antenna conductor patterns 10 and 20 .

[0063] Figures 4 to 7 This is a graph showing the characteristics of the antenna device 1 according to the present embodiment. Figure 4 、 6 In 7 and 8, (a) shows the characteristics of the antenna conductor pattern 20, and (b) shows the characteristics of the antenna conductor pattern 10. Figure 5 In FIG. 1 , (a) shows the characteristics of the antenna conductor patterns 10 and 20, and (b) shows the characteristics of the antenna conductor pattern 20. Figure 4 represents the return loss, Figure 5 Indicates isolation, Figure 6 represents the gain, Figure 7 The frequency band of the antenna conductor pattern 20 is 2.4 to 2.484 GHz, and the frequency band of the antenna conductor pattern 10 is 6.2 to 8.3 GHz. Figures 4 to 7 As shown, in the antenna device 1 of the present embodiment, the antenna conductor patterns 10 and 20 all have excellent return loss, isolation, gain, and radiation efficiency.

[0064] Figure 8 It is a schematic plan view showing the appearance of an antenna device 1A according to a first comparative example.

[0065] like Figure 8 As shown, the antenna device 1A of the first comparative example differs from the antenna device 1 of the above-described embodiment in that the capacitive element C is connected near the end of the radiation pattern R1 on the -Y direction side. In the antenna device 1A of the first comparative example, the capacitive element C is connected outside the range of ±λ / 20 from the center position P.

[0066] Figure 9 and Figure 10 is a graph showing the characteristics of the antenna device 1A of the first comparative example. Figure 9(a) represents the return loss of the antenna conductor pattern 20, Figure 9 (b) shows the return loss of the antenna conductor pattern 10. Figure 10 Indicates the separation of the antenna conductor patterns 10 and 20. Figure 9 and Figure 10 As shown, in the antenna device 1A of the first comparative example, the return loss of the antenna conductor pattern 20 and the isolation between the antenna conductor patterns 10 and 20 are good, but the return loss of the antenna conductor pattern 10 is inferior to that of the antenna device 1 of the above embodiment.

[0067] Figure 11 It is a schematic plan view showing the appearance of an antenna device 1B according to a second comparative example.

[0068] like Figure 11 As shown, the antenna device 1B of the second comparative example differs from the antenna device 1 of the above-described embodiment in that the capacitive element C is connected near the end of the radiation pattern R1 on the +Y direction side. In the antenna device 1B of the second comparative example, the capacitive element C is connected outside the range of ±λ / 20 from the center position P.

[0069] Figure 12 and Figure 13 is a graph showing the characteristics of the antenna device 1B of the second comparative example. Figure 12 (a) represents the return loss of the antenna conductor pattern 20, Figure 12 (b) shows the return loss of the antenna conductor pattern 10. Figure 13 Indicates the separation of the antenna conductor patterns 10 and 20. Figure 12 and Figure 13 As shown, in the antenna device 1B of the second comparative example, the isolation between the antenna conductor patterns 10 and 20 is good, but the return loss of the antenna conductor patterns 10 and 20 is inferior to that of the antenna device 1 of the above embodiment.

[0070] As described above, antenna device 1 of this embodiment has a structure in which antenna conductor patterns 10 and 20 having mutually different resonant frequencies are provided in ground gap region 4. Furthermore, a capacitor element C connecting antenna conductor pattern 10 and antenna conductor pattern 20 is inserted within a range of ±λ / 20 from a center position P. This eliminates inductive coupling occurring between antenna conductor pattern 10 and antenna conductor pattern 20. This ensures that various characteristics such as return loss, gain, and radiation efficiency are met while ensuring high isolation.

[0071] While the embodiments of the technology disclosed herein have been described above, the technology disclosed herein is not limited to the above embodiments, and various modifications can be made without departing from the spirit and scope thereof, which are naturally also included in the scope of the technology disclosed herein.

[0072] The technology disclosed herein includes the following configuration examples, but is not limited thereto.

[0073] An antenna device according to one aspect of the present disclosure includes: a substrate; a ground conductor formed on a surface of the substrate; a first antenna conductor pattern and a second antenna conductor pattern arranged on the surface of the substrate in a ground gap region where the ground conductor is interrupted; and a capacitor 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 the wavelength of electromagnetic waves relative to a center frequency of wireless communication using the first antenna conductor pattern is λ, the capacitor element is connected within a range of ±λ / 20 from the center position of the first radiation pattern in the first direction. Consequently, inductive coupling between the first and second antenna conductor patterns is eliminated by the capacitor element, thereby improving isolation between the first and second antenna conductor patterns. Furthermore, since the capacitor element is connected within a range of ±λ / 20 from the center position of the first radiation pattern in the first direction, good return loss characteristics can be achieved. Consequently, an antenna device that satisfies the return loss characteristics while ensuring sufficient isolation between the antennas can be achieved.

[0074] In the above-described antenna device, the ground gap region may be an area enclosed by a first edge of a ground conductor extending in a first direction, a second edge of the ground conductor extending in a second direction orthogonal to the first direction, and an edge of the substrate. This allows the first and second antenna conductor patterns to be positioned near the ends of the substrate, facilitating overall miniaturization of the antenna device.

[0075] In the above-described antenna device, the first radiation pattern may have an open end located opposite the first feed point in the first direction, and the first radiation pattern may include a region whose width gradually increases in the second direction from the first feed point toward the center, and a region whose width gradually decreases in the second direction from the center toward the open end. This allows the first radiation pattern to have a wider bandwidth.

[0076] In the above antenna device, the portion of the first radiation pattern having the largest width in the second direction may be located within a range of ±λ / 20 from the center position. This allows the first radiation pattern to have a further wide bandwidth.

[0077] In the above antenna device, the first antenna conductor pattern may further include a first conductor pattern connected to the first feed point, and a first inductor element may be connected between the first conductor pattern and the first radiation pattern.

[0078] In the above-described antenna device, the second antenna conductor pattern may include a second conductor pattern extending in the second direction from the second feed 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 and third conductor patterns toward a side opposite the second edge of the ground conductor. This improves the radiation efficiency of the second antenna conductor pattern.

[0079] The antenna device may further include a second inductor element connected to the second radiation pattern. This can reduce the return loss of the second antenna conductor pattern.

[0080] In the above antenna device, one end of the capacitor element may be connected to the first radiating pattern, and the other end of the capacitor element may be connected between the second inductor element and the second feed point. This allows adjustment of the return loss of the first and second antenna conductor patterns and the isolation between the first and second antenna conductor patterns.

[0081] In the above-described antenna device, the second inductor element may be a two-terminal chip component mounted on a substrate and having a first terminal and a second terminal. The first terminal of the second inductor element may be connected to the second radiation pattern, and the second terminal of the second inductor element may be connected to a connection point between the second conductor pattern and the third conductor pattern. This allows for a compact antenna to achieve a sufficient inductance value and reduces variations in the inductance value.

[0082] In the above antenna device, one end of the capacitor element may be connected to the first radiating pattern, and the other end of the capacitor element may be connected to a connection point between the second and third conductor patterns. This allows adjustment of the return loss of the first and second antenna conductor patterns, as well as the isolation between the first and second antenna conductor patterns.

[0083] In the above-described 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 distal end of the first portion toward a first edge of the ground conductor. This can suppress the effect of the second antenna conductor pattern on the radiation characteristics of the first antenna conductor pattern and reduce the size of the antenna device.

[0084] In the above antenna device, the third conductor pattern may be connected to the second edge of the ground conductor. In this way, the second antenna conductor pattern forms an inverted-F antenna.

[0085] In the above-described antenna device, at least one of the first antenna conductor pattern and the second antenna conductor pattern may include a connection pattern, the capacitor element may be connected to the first antenna conductor pattern or the second antenna conductor pattern via the connection pattern, and the connection pattern may have a narrower pattern width than the second antenna conductor pattern. This can suppress the influence of the connection pattern on the antenna characteristics.

Claims

1. An antenna device comprising: substrate; a ground conductor formed on a surface of the substrate; a first antenna conductor pattern and a second antenna conductor pattern arranged on the surface of the substrate in a ground gap region where the ground conductor is cut off; and a capacitor element connecting the first antenna conductor pattern and the second antenna conductor pattern, The first antenna conductor pattern includes a first radiation pattern extending from a first feeding point in a first direction. When the wavelength of electromagnetic waves in wireless communication using the first antenna conductor pattern relative to the center frequency is λ, the capacitive element is connected within a range of ±λ / 20 from the center position of the first radiation pattern in the first direction.

2. The antenna device according to claim 1, wherein The ground gap 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.

3. The antenna device according to claim 2, wherein: The first radiation pattern has an open end located on the opposite side of the first power feeding point in the first direction. The first radiation pattern includes a region whose width in the second direction gradually increases from the first feeding point toward the center position, and a region whose width in the second direction gradually decreases from the center position toward the open end. The antenna device according to claim 3 , wherein: A portion of the first radiation pattern having the largest width in the second direction is located within a range of ±λ / 20 from the center position.

5. The antenna device according to claim 1, wherein The first antenna conductor pattern further includes a first conductor pattern connected to the first feed point. A first inductor element is connected between the first conductor pattern and the first radiation pattern. The antenna device according to claim 2 , wherein: The second antenna conductor pattern includes: a second conductor pattern extending along the second direction from a second feeding point toward the first antenna conductor pattern, a third conductor pattern extending along the first direction from the second conductor pattern toward the second edge of the ground conductor, and a second radiation pattern extending along the first direction from a connection point between the second conductor pattern and the third conductor pattern toward the opposite side of the second edge of the ground conductor.

7. The antenna device according to claim 6, wherein: A second inductance element connected to the second radiation pattern is further provided.

8. The antenna device according to claim 7, wherein: One end of the capacitor is connected to the first radiation pattern. The other end of the capacitive element is connected between the second inductive element and the second power supply point.

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

10. The antenna device according to claim 6, wherein One end of the capacitor 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.

11. The antenna device according to claim 6, wherein The second radiation pattern includes a first portion extending along the first direction and a second portion extending along the second direction from a front end of the first portion toward the first edge of the ground conductor.

12. The antenna device according to claim 6, wherein The third conductor pattern is connected to the second edge of the ground conductor.

13. The antenna device according to any one of claims 1 to 12, wherein: At least one of the first antenna conductor pattern and the second antenna conductor pattern has a connection pattern. The capacitive 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 is narrower than a pattern width of the second antenna conductor pattern.

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