Antenna module and wireless power transmission device including same

Abstract

To provide an antenna module capable of obtaining good communication characteristics regardless of the position of an antenna coil built in an IC card.SOLUTION: An antenna module 1 includes a first coil pattern CP1 including first and second turns T1 and T2. Openings of the first and second turns T1 and T2 have a shape in which the opening width in an x direction is larger than the opening width in a y direction when viewed from a coil axis direction. The opening width of the opening of the second turn T2 in the y direction is larger than the opening width in the y direction of the opening of the first turn T1. Sections 51 and 52 extending in the x direction of the second turn T2 have protruding sections A1 and A2 in which distances D2 and D4 in the y-direction from sections 41 and 42 extending in the x direction of the first turn T1 becomes longer.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an antenna module and a wireless power transmission device including the same. [Background technology]

[0002] Patent Document 1 discloses a reader / writer that performs contactless data communication with an IC card. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-298095 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when communication is performed while the IC card is housed in a case together with the mobile terminal, the communication characteristics deteriorate due to the influence of the metal casing and built-in battery of the mobile terminal, so there has been a demand for an antenna module that has high coupling with the antenna coil built into the IC card.In addition, because the antenna coil of the reader / writer described in Patent Document 1 is circular, there has been a problem in that communication becomes unstable if the IC card is misaligned with the reader / writer.

[0005] Therefore, an object of the present disclosure is to provide an antenna module that has high coupling with an antenna coil built into an IC card and can obtain good communication characteristics even if the position of the antenna coil built into the IC card is shifted. [Means for solving the problem]

[0006] An antenna module according to one embodiment of the present disclosure comprises a first coil pattern including at least first and second turns, wherein the openings of the first and second turns have a shape in which the opening width in the first direction, as viewed from the coil axis direction, is larger than the opening width in a second direction perpendicular to the first direction, the opening width of the opening of the second turn in the second direction is larger than the opening width of the opening of the first turn in the second direction, and the section of the second turn extending in the first direction has a protruding section that is spaced apart in the second direction from the section of the first turn extending in the first direction. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an antenna module that has high coupling with an antenna coil built into an IC card and can obtain good communication characteristics even if the position of the antenna coil built into the IC card is shifted. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic cross-sectional view illustrating the structure of an antenna module 1 according to an embodiment. [Figure 2] FIG. 2 is a schematic plan view showing the pattern shape of the first coil pattern CP1. [Figure 3] FIG. 3 is a schematic plan view showing the shape of the conductor pattern formed on one surface 21 of the second base material 20. As shown in FIG. [Figure 4] FIG. 4 is a schematic plan view showing the shape of the conductor pattern formed on the other surface 22 of the second substrate 20. As shown in FIG. [Figure 5] FIG. 5 is a block diagram of a wireless power transmission device 90 using the antenna module 1. [Figure 6] FIG. 6 is a schematic plan view showing the pattern shape of the first coil pattern CP1 according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Preferred embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.

[0010] FIG. 1 is a schematic cross-sectional view illustrating the structure of an antenna module 1 according to an embodiment.

[0011] As shown in FIG. 1 , an antenna module 1 according to one embodiment includes a first substrate 10 and a second substrate 20 made of a PET (polyethylene terephthalate) film or the like, a first coil pattern CP1 that is a conductor pattern made of a good conductor such as Cu and provided on one and the other surfaces 11 and 12 of the first substrate 10, a second coil pattern CP2 that is a conductor pattern made of a good conductor such as Cu and provided on one and the other surfaces 21 and 22 of the second substrate 20, and a magnetic sheet 30. The first coil pattern CP1 is an antenna coil for NFC (near field communication), and the second coil pattern CP2 is a power transmission coil for wireless power transmission. The first coil pattern CP1 and the second coil pattern CP2 overlap in the coil axis direction. The coil axis direction of the first and second coil patterns CP1 and CP2 is the z direction, and the first substrate 10, the second substrate 20, and the magnetic sheet 30 are arranged in this order so as to overlap in the z direction. In other words, the second substrate 20 is positioned between the first substrate 10 and the magnetic sheet 30, and the distance in the z direction between the magnetic sheet 30 and the first substrate 10 is greater than the distance in the z direction between the magnetic sheet 30 and the second substrate 20.

[0012] FIG. 2 is a schematic plan view showing the pattern shape of the first coil pattern CP1.

[0013] As shown in FIG. 2, conductor patterns P1 and P2 are formed on one surface 11 of the first substrate 10, and a conductor pattern P3 is formed on the other surface 12 of the first substrate 10. These conductor patterns P1 to P3 constitute the first coil pattern CP1. One end of the conductor pattern P1 is connected to the terminal electrode E1, and the other end of the conductor pattern P1 is connected to one end of the conductor pattern P3 through a via conductor 71 provided through the first substrate 10. Also, one end of the conductor pattern P2 is connected to the terminal electrode E2, and the other end of the conductor pattern P2 is connected to the other end of the conductor pattern P3 through a via conductor 72 provided through the first substrate 10.

[0014] The first coil pattern CP1 constituted by the conductor patterns P1 to P3 includes a first turn T1, a second turn T2, and a third turn T3 that circulate in a substantially rectangular shape. The first turn T1 is the innermost turn of the first coil pattern CP1, the opening width in the y direction of its opening is Y1, and the opening width in the x direction is X1. The x direction is, for example, the first direction, and the y direction is, for example, the second direction. The second turn T2 is located on the outer periphery of the first turn T1, the opening width in the y direction of its opening is Y2, and it is larger than the opening width Y1 of the first turn T1 (Y2>Y1). The third turn T3 is located on the outer periphery of the second turn T2, the opening width in the y direction of its opening is Y3, it is larger than the opening width Y2 of the second turn T2 (Y3>Y2), and smaller than the opening width X1 of the first turn T1 (Y3<X1). The opening widths in the x direction of the openings of the second turn T2 and the third turn T3 are substantially the same as the opening width X1 of the first turn T1. Therefore, each of the first turn T1, the second turn T2, and the third turn T3 has a horizontally long shape in which the section extending in the x direction is the long side and the section extending in the y direction is the short side. And when the first coil pattern CP1 starts from the terminal electrode E1 and ends at the terminal electrode E2, it circulates in the order of a part of the third turn T3, the second turn T2, the first turn T1, and the remaining part of the third turn T3. The third turn T3 includes the conductor pattern P3 formed on the other surface 12 of the first substrate 10. In contrast, the first turn T1 and the second turn T2 are both constituted by the conductor pattern P1 formed on one surface 11 of the first substrate 10.

[0015] The first turn T1 has sections 41 and 42 extending in the x direction and sections 43 and 44 extending in the y direction. Sections 41 and 42 extend linearly in the x direction, and sections 43 and 44 extend linearly in the y direction. Therefore, the planar shape of the first turn T1 is approximately rectangular except for the curved corners. The third turn T3 also has a shape similar to that of the first turn T1. That is, the third turn T3 has sections 61 and 62 extending in the x direction and sections 63 and 64 extending in the y direction. Sections 61 and 62 extend linearly in the x direction, and sections 63 and 64 extend linearly in the y direction. Therefore, the planar shape of the third turn T3 is approximately rectangular except for the curved corners.

[0016] In contrast, the second turn T2 has a different planar shape from the first and third turns T1 and T3. As shown in FIG. 2 , the second turn T2 has sections 51 and 52 extending in the x direction and sections 53 and 54 extending in the y direction. Here, sections 53 and 54 extend linearly in the y direction, while sections 51 and 52 have sections whose positions in the y direction vary. Specifically, section 51 has straight sections 510 and 511 extending linearly in the x direction and a protruding section A1 located between the straight sections 510 and 511 and bulging outward in the y direction. Therefore, the distance D1 in the y direction between section 41 of the first turn T1 and straight sections 510 and 511 of the second turn T2 is constant, whereas the distance D2 in the y direction between section 41 of the first turn T1 and protruding section A1 of the second turn T2 is greater than the distance D1, and the value of the distance D2 varies depending on the position in the x direction. Similarly, section 52 has straight sections 520, 521 that extend linearly in the x direction and a protruding section A2 that is located between straight sections 520, 521 and bulges outward in the y direction. Therefore, the distance D3 in the y direction between section 42 of second turn T2 and straight sections 520, 521 of second turn T2 is constant, whereas the distance D4 in the y direction between section 42 of first turn T1 and protruding section A2 of second turn T2 is greater than the distance D3, and the value of distance D4 varies depending on the position in the x direction. Distances D1 and D3 may be the same, or distances D2 and D4 may be the same.

[0017] The protruding section A1 has an inclined section 512 that protrudes in the y direction while inclining relative to the x direction so that the distance D2 in the y direction from section 41 of the first turn T1 gradually increases when the straight section 510 is the starting point and the straight section 511 is the end point, an inclined section 513 that protrudes in the y direction while inclining relative to the x direction so that the distance D2 in the y direction from section 41 of the first turn T1 gradually increases when the straight section 511 is the starting point and the straight section 510 is the end point, and a connecting section 514 located between the inclined sections 512 and 513. Similarly, protruding section A2 has an inclined section 522 that inclines relative to the x direction and protrudes in the y direction so that, when straight section 520 is the start point and straight section 521 is the end point, a distance D4 in the y direction from section 42 of first turn T1 gradually increases, an inclined section 523 that inclines relative to the x direction and protrudes in the y direction so that, when straight section 521 is the start point and straight section 520 is the end point, a connection section 524 located between inclined sections 522 and 523. The connection sections 514 and 524 are the radially outermost parts of protruding sections A1 and A2, and may be linear or gently curved relative to the x direction.

[0018] Even if the opening width Y2 in the y direction of the opening of the second turn T2 is set to the width (Y1+D2+D4) between the connection section 514 and the connection section 524, this opening width (Y1+D2+D4) is larger than the opening width Y1 of the first turn T1 and smaller than the opening width Y3 of the third turn T3. Moreover, the radial direction is the direction from the inner periphery to the outer periphery or from the outer periphery to the inner periphery, centered on the coil axis of the coil pattern.

[0019] As described above, the first coil pattern CP1, which functions as an antenna coil, has a first turn T1 with an opening width Y1 in the y direction, a second turn T2 with an opening width Y2 (>Y1), and a third turn T3 with an opening width Y3 (>Y2). Because the opening width Y3 in the y direction of the third turn T3 is smaller than the opening width X1 in the x direction of the first turn T1, coupling to an antenna coil built into an IC card with a horizontally elongated shape such as a credit card is enhanced, improving communication characteristics. Furthermore, because the protruding sections A1 and A2 are provided on the second turn T2, good communication characteristics can be obtained even if the position of the antenna coil built into the IC card in the y direction is shifted. This is because the y-direction positions of the protruding sections A1 and A2 of the second turn T2 change depending on the x-direction position, thereby expanding the communication range in the y direction.

[0020] To obtain better communication characteristics, it is preferable to design the length of the protruding sections A1 and A2 in the x direction to be longer than the total length of the straight sections 510 and 511 in the x direction and the total length of the straight sections 520 and 521 in the x direction. This enables correct communication even if the position of the antenna coil built into the IC card is shifted in the y direction. In particular, by positioning the connection section 514 in the y direction closer to the section 61 of the third turn T3 than the straight sections 510 and 511 of the second turn T2, and by positioning the connection section 524 in the y direction closer to the section 62 of the third turn T3 than the straight sections 520 and 521 of the second turn T2, the tolerance for positional shift in the y direction can be increased.

[0021] FIG. 3 is a schematic plan view showing the shape of the conductor pattern formed on one surface 21 of the second base material 20. As shown in FIG.

[0022] As shown in FIG. 3, a spiral conductor pattern 100 that constitutes the second coil pattern CP2 is formed on one surface 21 of the second substrate 20.

[0023] The conductor pattern 100 constituting the second coil pattern CP2 has a six-turn configuration consisting of turns 110, 120, 130, 140, 150, and 160, with turn 110 located on the outermost periphery and turn 160 located on the innermost periphery. Of these, turns 110, 120, 130, 140, and 150 are radially divided into four by three spiral slits. Meanwhile, turn 160 is radially divided into two by one spiral slit. As a result, turn 110 is divided into four lines 111-114, turn 120 is divided into four lines 121-124, turn 130 is divided into four lines 131-134, turn 140 is divided into four lines 141-144, turn 150 is divided into four lines 151-154, and turn 160 is divided into two lines 161 and 162.

[0024] Lines 111, 121, 131, 141, 151, and 161 are continuous lines wound in a spiral for six turns, and are located at the outermost periphery of each turn. Lines 112, 122, 132, 142, 152, and 162 are continuous lines wound in a spiral for six turns, and are located at the second outermost periphery of each turn. Lines 113, 123, 133, 143, and 153 are continuous lines wound in a spiral for five turns, and are located at the second innermost periphery of each turn. Lines 114, 124, 134, 144, and 154 are continuous lines wound in a spiral for five turns, and are located at the innermost periphery of each turn.

[0025] The outer peripheral ends of the lines 111 to 114 are commonly connected to the terminal electrode E3, while the inner peripheral ends of the lines 161, 162, 153, and 154 are connected to through-hole conductors 301 to 304 that penetrate the second base material 20, respectively.

[0026] Figure 4 is a schematic plan view showing the shape of the conductor pattern formed on the other surface 22 of the second substrate 20, and shows the state when viewed from one surface 21 side of the second substrate 20, that is, the state when viewed through the second substrate 20.

[0027] 4, a spiral conductor pattern 200 constituting the second coil pattern CP2 is formed on the other surface 22 of the second substrate 20. In this embodiment, the other surface 22 of the second substrate 20 is disposed facing the surface of the magnetic sheet 30, but one surface 21 of the second substrate 20 may be disposed facing the surface of the magnetic sheet 30.

[0028] The pattern shape of the main part of the conductor pattern 200 constituting the second coil pattern CP2 is the same as the pattern shape of the conductor pattern 100. The conductor pattern 200 is a six-turn configuration consisting of turns 210, 220, 230, 240, 250, and 260, with turn 210 located on the outermost periphery and turn 260 located on the innermost periphery. Of these, turns 210, 220, 230, 240, and 250 are divided radially into four by three spiral slits. Meanwhile, turn 260 is divided radially into two by one spiral slit. As a result, turn 210 is divided into four parts into lines 211 to 214, turn 220 is divided into four parts into lines 221 to 224, turn 230 is divided into four parts into lines 231 to 234, turn 240 is divided into four parts into lines 241 to 244, turn 250 is divided into four parts into lines 251 to 254, and turn 260 is divided into two parts into lines 261 and 262.

[0029] Lines 211, 221, 231, 241, 251, and 261 are continuous lines wound spirally for six turns, and are located at the outermost periphery of each turn. Lines 212, 222, 232, 242, 252, and 262 are continuous lines wound spirally for six turns, and are located at the second outermost periphery of each turn. Lines 213, 223, 233, 243, and 253 are continuous lines wound spirally for five turns, and are located at the second innermost periphery of each turn. Lines 214, 224, 234, 244, and 254 are continuous lines wound spirally for five turns, and are located at the innermost periphery of each turn.

[0030] The outer peripheral ends of lines 211 to 214 are commonly connected to terminal electrode E4 via through-hole conductors. Meanwhile, the inner peripheral ends of lines 261, 262, 253, and 254 are respectively connected to through-hole conductors 304, 303, 302, and 301. As a result, four 11-turn lines are connected in parallel between terminal electrode E3 and terminal electrode E4.

[0031] Fig. 2 shows the planar positional relationship between the first coil pattern CP1 and the second coil pattern CP2 when the first substrate 10 and the second substrate 20 are overlapped. In Fig. 2, the inner shape ID defined by the innermost turn of the second coil pattern CP2 and the outer shape OD defined by the outermost turn of the second coil pattern CP2 are shown by dashed lines. The area between the inner shape ID and the outer shape OD is a coil area where multiple lines constituting the second coil pattern CP2 are arranged, and its radial width is the winding width of the second coil pattern CP2.

[0032] 2, the opening width Yi in the y direction of the inner form ID of the second coil pattern CP2 is approximately the same as or slightly smaller than the opening width Y1 in the y direction of the first turn T1 of the first coil pattern CP1. Meanwhile, the opening width Yo in the y direction of the outer form OD of the second coil pattern CP2 is larger than the opening width Y2 in the y direction of the second turn T2 of the first coil pattern CP1 and smaller than the opening width Y3 in the y direction of the third turn T3 of the first coil pattern CP1. Therefore, most of the second turn T2 of the first coil pattern CP1 overlaps with the coil region of the second coil pattern CP2.

[0033] Here, the positions in the y direction of the connection sections 514, 524 included in the second turn T2 are preferably closer to the outer diameter OD of the second coil pattern CP2, i.e., the outermost turn, than to the inner diameter ID of the second coil pattern CP2, i.e., the innermost turn. In other words, it is preferable to position the connection sections 514, 524 outside the middle position of the winding width of the second coil pattern CP2. This is because the magnetic field generated by the second coil pattern CP2 is strongest at the inner diameter ID, and by positioning the protruding sections A1, A2 as far as possible from the inner diameter ID and close to the outer diameter OD, it is possible to suppress an increase in the AC resistance of the second coil pattern CP2 due to overlap with the first coil pattern CP1.

[0034] FIG. 5 is a block diagram of a wireless power transmission device 90 using the antenna module 1 according to this embodiment.

[0035] 5 includes an antenna module 1 having first and second coil patterns CP1 and CP2, a communication circuit 91 connected to the first coil pattern CP1, and a power transmission circuit 92 connected to the second coil pattern CP2. A capacitor C1 is connected between the communication circuit 91 and the first coil pattern CP1. The communication circuit 91 and the power transmission circuit 92 are connected to a control circuit 93. As a result, data transmitted and received via a communication line 94 can be communicated via the first coil pattern CP1 for NFC, and power supplied by a power source 95 can be transmitted wirelessly via the second coil pattern CP2 for wireless power transmission.

[0036] FIG. 6 is a schematic plan view showing the pattern shape of the first coil pattern CP1 according to a modified example.

[0037] The first coil pattern CP1 according to the modified example shown in Fig. 6 differs from the first coil pattern CP1 shown in Fig. 2 in that the protruding section A1 is made up of straight sections 515 to 517, and the protruding section A2 is made up of straight sections 525 to 527. Since the other basic configurations are the same as those of the first coil pattern CP1 shown in Fig. 2, the same elements are given the same reference numerals and redundant explanations will be omitted.

[0038] As shown in FIG. 6 , straight sections 515, 516, 525, and 526 are sections that extend linearly in the y direction, and straight sections 517 and 527 are sections that extend linearly in the x direction. Straight section 515 connects one end of straight section 510 to one end of straight section 517, and straight section 516 connects one end of straight section 511 to the other end of straight section 517. Straight section 525 connects one end of straight section 520 to one end of straight section 527, and straight section 526 connects one end of straight section 521 to the other end of straight section 527. In this case, distance D2 is defined by the distance in the y direction between section 41 of the first turn T1 and straight section 517 of the second turn T2, and distance D4 is defined by the distance in the y direction between section 42 of the first turn T1 and straight section 527 of the second turn T2.

[0039] As illustrated in the first coil pattern CP1 according to a modified example shown in FIG. 6, it is not essential that the protruding sections A1 and A2 include an inclined section.

[0040] The above describes preferred embodiments of the present disclosure, but the present disclosure is not limited to the above embodiments, and various modifications are possible within the scope of the present disclosure, and it goes without saying that these modifications are also included within the scope of the present disclosure.

[0041] For example, in the above embodiment, the first coil pattern CP1 is configured by the first turn T1, the second turn T2, and the third turn T3, but the third turn T3 may be omitted, or a fourth turn may be added to the first coil pattern CP1.

[0042] The technology according to the present disclosure includes, but is not limited to, the following configuration examples.

[0043] The antenna module according to the present disclosure includes a first coil pattern including at least first and second turns, wherein the openings of the first and second turns have a shape in which the opening width in the first direction as viewed from the coil axis direction is larger than the opening width in a second direction perpendicular to the first direction, the opening width of the opening of the second turn in the second direction is larger than the opening width of the opening of the first turn in the second direction, and the section of the second turn extending in the first direction has a protruding section that is spaced apart in the second direction from the section of the first turn extending in the first direction. This makes it possible to obtain good communication characteristics even when the position of the antenna coil to be communicated with is shifted in the second direction.

[0044] The protruding section may have an inclined section that protrudes radially while being inclined with respect to the first direction, which prevents a sudden change in communication characteristics when the antenna coil to be communicated with is displaced in the second direction, as compared to when the protruding section protrudes linearly in the second direction, making it possible to obtain good communication characteristics.

[0045] The section of the second turn extending in the first direction may further include a straight section extending linearly in the first direction. This enhances coupling when there is no misalignment of the antenna coil to be communicated with, making it possible to obtain good communication characteristics. In this case, the length of the protruding section in the first direction may be longer than the length of the straight section in the first direction. This expands the allowable range of misalignment of the antenna coil to be communicated with in the second direction.

[0046] The first coil pattern may further include a third turn, and the opening width of the third turn in the second direction may be larger than the opening width of the second turn in the second direction. This allows for a wider communication range. In this case, when viewed from the coil axis direction of the first coil pattern, the radially outermost portion of the protruding section may be closer to the third turn in the second direction than the straight section. This increases the tolerance for misalignment of the antenna coil to be used for communication in the second direction.

[0047] The antenna module according to the present disclosure may further include a second coil pattern that overlaps the first coil pattern when viewed in the coil axis direction of the first coil pattern. This enables wireless power transmission in addition to communication via NFC or the like. In this case, when viewed in the coil axis direction, the radially outermost portion of the protruding section may be closer to the outermost turn of the second coil pattern than to the innermost turn of the second coil pattern. This makes it possible to suppress an increase in AC resistance of the second coil pattern.

[0048] Furthermore, a wireless power transmission device according to the present disclosure may include the antenna module, a communication circuit connected to the first coil pattern, and a power transmission circuit connected to the second coil pattern, thereby enabling wireless power transmission and NFC communication. [Explanation of symbols]

[0049] 1 Antenna Module 10 First base material 11 One surface of the first substrate 12 other surface of the first substrate 20 Second base material 21 One surface of the second substrate 22 other surface of second substrate 30 Magnetic Sheet Sections 41-44, 51-54, 61-64 510,511,520,521 Straight section 512,513,522,523 Inclined section 514,524 connecting sections 71,72 Via conductor 90 Wireless power transmission device 91 Communication Circuit 92 Power Transmission Circuit 93 Control circuit 94 Communication Lines 95 Power supply 100,200 conductor patterns 110,120,130,140,150,160,210,220,230,240,250,260 turns 111~114, 121~124, 131~134, 141~144, 151~154, 161, 162, 211~214, 221~224, 231~234, 241~244, 251~254, 261, 262 Lines 301~304 Through-hole conductors A1,A2 protruding section C1 capacitor CP1 First coil pattern CP2 Second coil pattern D1~D4 distance E1~E4 terminal electrode ID inner shape OD external shape P1~P3 Conductor patterns T1 Turn 1 T2 Turn 2 T3 Turn 3 X1, Y1 to Y3, Yi, Yo opening width

Claims

1. a first coil pattern including at least first, second, and third turns; the openings of the first and second turns have a shape in which the opening width in a first direction as viewed from the coil axis direction is larger than the opening width in a second direction perpendicular to the first direction, an opening width of the opening of the second turn in the second direction is larger than an opening width of the opening of the first turn in the second direction; an opening width of the opening of the third turn in the second direction is larger than an opening width of the opening of the second turn in the second direction; the section of the second turn extending in the first direction includes a straight section extending linearly in the first direction and a protruding section bulging outward in the second direction, a first distance in the second direction between the section of the first turn extending in the first direction and the protruding section of the second turn at the same position in the first direction is greater than a second distance in the second direction between the section of the first turn extending in the first direction and the straight section of the second turn at the same position in the first direction, An antenna module wherein a third distance in the second direction between the section of the third turn extending in the first direction and the protruding section of the second turn at the same position in the first direction is closer than a fourth distance in the second direction between the section of the third turn extending in the first direction and the straight section of the second turn at the same position in the first direction.

2. The antenna module according to claim 1 , wherein the protruding section has an inclined section that protrudes in a radial direction while being inclined with respect to the first direction.

3. The antenna module according to claim 1 , wherein the length of the protruding section in the first direction is longer than the length of the straight section in the first direction.

4. An antenna module described in any one of claims 1 to 3, wherein the first distance is greater than the third distance.

5. 5. The antenna module according to claim 1, wherein, when viewed from the coil axis direction of the first coil pattern, the radially outermost portion of the protruding section is positioned closer to the third turn in the second direction than the straight section.

6. The antenna module according to claim 1 , further comprising a second coil pattern that overlaps with the first coil pattern when viewed in a coil axis direction of the first coil pattern.

7. 7. The antenna module according to claim 6, wherein, when viewed from the coil axis direction, the radially outermost portion of the protruding section is closer to the outermost turn of the second coil pattern than to the innermost turn of the second coil pattern.

8. The antenna module according to claim 6 or 7; a communication circuit connected to the first coil pattern; a power transmission circuit connected to the second coil pattern.

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