Optimal antenna module for uniform current distribution based on conductor line structure

Abstract

An antenna module according to one embodiment comprises: a printed circuit board; first to nth conductive lines (n is a natural number greater than or equal to 2) arranged in parallel in a spiral structure on the upper and lower surfaces of the printed circuit board; and vias formed in the inner diameter region of the spiral structure of the printed circuit board so as to electrically connect the first to nth conductive lines between the upper surface and the lower surface. When the first to nth conductive lines are divided into a first group and a second group according to the order in which they are arranged from the outer diameter to the inner diameter direction of the spiral structure on the upper surface, the first group is arranged to extend and rotate further toward the inner diameter side than the second group on the upper surface, thereby reversing the arrangement order of the first group and the second group in the inner diameter region of the upper surface, and the first to nth conductive lines are arranged in a spiral structure opposite to the upper surface on the lower surface, so that the arrangement order of the first group and the second group from the outer diameter to the inner diameter direction of the lower surface is opposite to that of the upper surface.

Description

Technology Field

[0001] The present invention relates to wireless power transmission technology, and more specifically, to an antenna module designed to ensure uniformity of current distribution for a plurality of conductive lines by optimizing the structure of conductive lines formed on a printed circuit board by configuring the lengths and sequences of the upper and lower conductive lines of the printed circuit board in an alternating manner. Background Technology

[0002] Wireless power transmission technology is bringing innovation to the charging methods of various electronic devices, based on recent advancements in electromagnetic induction and resonance methods. In particular, the printed circuit board (PCB) placed inside the wireless charging pad serves as a core component of the transmitting coil and directly influences power efficiency, thermal stability, and electromagnetic interference levels. Such PCBs typically contain one or more conductive pattern lines, each formed along the path of the transmitting coil; the performance of wireless charging is determined by their electrical characteristics and structural arrangement.

[0003] The pattern structure of conventional wireless charging printed circuit boards generally features multiple conductive lines formed on the top and bottom surfaces, and methods of connecting these lines in series or parallel have been utilized. In this case, the conductive lines arranged in a parallel structure on the same plane are fundamentally designed to maintain an overall uniform width to ensure uniform current distribution.

[0004] However, conventional printed circuit boards have a limitation in structural asymmetry, where the lengths of each conductive line differ due to conditions such as outer and inner diameters and the insertion of slit structures during the manufacturing process.

[0005] This structural asymmetry causes an imbalance in the current flowing through each conductive line. As such, since the resistance value changes depending on the length of each conductive line, more current flows through the line with relatively lower resistance, and less current flows through the line with higher resistance.

[0006] This causes current to concentrate on specific conduction lines, resulting in unnecessary power loss due to overheating and overload, which lowers the overall system efficiency. In addition, the imbalance of current causes asymmetry in the electromagnetic field, which can be a factor in increasing electromagnetic interference throughout the system.

[0007] To solve such problems, the present invention proposes a new design capable of improving line-specific resistance characteristics by considering structural characteristics such as the arrangement order of each conductive line. Prior art literature

[0008] Korean Registered Patent Publication No. 10-2601640 The problem to be solved

[0009] The present invention aims to solve the aforementioned problems by providing an antenna module capable of improving the phenomenon of uneven current distribution among a plurality of conductive lines formed on a printed circuit board and ensuring uniformity of current distribution. To this end, the present invention proposes a new pattern design that maintains a uniform overall path length of each line by configuring the arrangement order of conductive lines on the upper and lower surfaces asymmetrically, thereby structurally correcting the imbalance in resistance values ​​caused by differences in the lengths of the conductive lines.

[0010] The objective is to realize a structure that can improve the efficiency and stability of a wireless power transmission system by preventing excessive concentration of current in specific conduction lines, minimizing power loss and heat generation, and reducing electromagnetic interference.

[0011] Meanwhile, the technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by a person skilled in the art from the description below. means of solving the problem

[0012] An antenna module according to one embodiment comprises: a printed circuit board; first to nth conductive lines (n is a natural number greater than or equal to 2) arranged in parallel in a spiral structure on the upper and lower surfaces of the printed circuit board; and vias formed in the inner diameter region of the spiral structure of the printed circuit board so as to electrically connect the first to nth conductive lines between the upper surface and the lower surface. When the first to nth conductive lines are divided into a first group and a second group according to the order in which they are arranged from the outer diameter to the inner diameter direction of the spiral structure on the upper surface, the first group is arranged to extend and rotate further toward the inner diameter side than the second group on the upper surface, thereby reversing the arrangement order of the first group and the second group in the inner diameter region of the upper surface, and the first to nth conductive lines are arranged in a spiral structure opposite to the upper surface on the lower surface, so that the arrangement order of the first group and the second group from the outer diameter to the inner diameter direction of the lower surface is opposite to that of the upper surface.

[0013] Additionally, on the upper surface, the width of the conductive line of the first group may be formed to be wider than or equal to the width of the conductive line of the second group, and on the lower surface, the width of the conductive line of the second group may be formed to be wider than or equal to the width of the conductive line of the first group.

[0014] In addition, the first to nth conductive lines may be configured to allow adjustment of the LS (Inductance Series) value of the antenna module by forming the position of the contact point where the inner diameter end of the first to nth conductive line formed on the upper surface and the inner diameter end of the first to nth conductive line formed on the lower surface are connected to each other.

[0015] In addition, the first to nth conductive lines may be formed such that the standard deviation for each length extending from the upper surface to the lower surface is 1.5 mm or less.

[0016] Additionally, the first group may include k predetermined conductive lines (where k is a natural number smaller than n) arranged in the direction from the outermost diameter of the upper surface to the inner diameter among the first to n conductive lines, and the second group may include the remaining conductive lines among the first to n conductive lines excluding the first group. Effects of the invention

[0017] According to the present invention, by arranging a plurality of conductive lines formed on the upper and lower surfaces of a printed circuit board in an asymmetrical order, the total path length of each conductive line can be configured to be substantially uniform. Accordingly, the distribution of current flowing through each line can be maintained evenly, thereby effectively preventing risks such as overheating, overloading, and insulation breakdown that may occur due to the concentration of current in a specific line.

[0018] In addition, even for internal structures on the top or bottom surfaces where the physical length of each conduction line inevitably varies, resistance values ​​can be precisely corrected by adjusting the width per line, thereby resolving current imbalance issues that may occur within the same surface.

[0019] As such, the uniformization of current distribution minimizes power loss and contributes to reducing electromagnetic interference that may occur due to magnetic field asymmetry, thereby ensuring both the efficiency and electromagnetic stability of the entire wireless power transmission system. Furthermore, as heat is evenly distributed, thermal stress on system components is alleviated, which can be expected to improve the durability and lifespan of the device.

[0020] Meanwhile, the effects of the present invention are not limited to those mentioned above, and other unmentioned technical effects will be clearly understood by a person skilled in the art from the description below. Brief explanation of the drawing

[0021] FIG. 1 is a diagram illustrating a pattern structure of conductive lines formed spirally on the upper and lower surfaces of a printed circuit board according to the prior art. FIG. 2 is a diagram illustrating the arrangement structure of conductive lines formed on the upper and lower surfaces of a printed circuit board according to the prior art, and the total path length of each pair of conductive lines. FIGS. 3 and FIGS. 4 are configuration diagrams illustrating the configuration of an antenna module according to an embodiment of the present invention with respect to the top and bottom surfaces, respectively. FIG. 5 is a diagram illustrating the arrangement structure of conductive lines formed on the upper and lower surfaces of an antenna module according to one embodiment, and the total path length of each pair of conductive lines. FIGS. 6 and 7 are drawings illustrating a structure in which the total length of the conductive lines is balanced by configuring the width of each conductive line differently in an antenna module according to one embodiment. FIGS. 8 and 9 are drawings illustrating a structure for adjusting an LS value by adjusting the via contact position of a conductive line in an antenna module according to an embodiment of the present invention. FIG. 10 is a diagram showing the current and current distribution ratio of an antenna module according to the prior art. FIG. 11 is a diagram showing the current flowing through each conductive line and the current distribution ratio in an antenna module according to an embodiment of the present invention in which the width of each conductive line is the same. FIG. 12 is a diagram showing the current flowing through each conductive line and the current distribution ratio in an antenna module according to the present invention, in which the width of each conductive line is adjusted differently according to the group. Specific details for implementing the invention

[0022] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the attached drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0023] Unless otherwise defined, all terms used herein (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which the present invention pertains. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise. The terms used herein are for describing embodiments and are not intended to limit the present invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text.

[0024] As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0025] FIG. 1 is a diagram illustrating a pattern structure of conductive lines formed spirally on the upper and lower surfaces of a printed circuit board according to the prior art.

[0026] Referring to FIG. 1, a plurality of conductive lines are arranged in parallel on the upper and lower surfaces of a printed circuit board, respectively, and each conductive line is formed to rotate in a spiral structure in the same direction. At this time, the left side of FIG. 1 illustrates the upper surface of the printed circuit board, and the right side of FIG. 1 illustrates the lower surface of the printed circuit board. Both the upper and lower surfaces are images drawn from a view looking down vertically from above.

[0027] The structure of the conventional antenna module shown in Fig. 1 contains a problem in which the total length of each conductive line is formed differently depending on the position of the conductive line. For example, a conductive line positioned closer to the outer diameter of the spiral structure (e.g., red conductive line) has a large radius of rotation and a long path length, while a conductive line positioned relatively farther from the outer diameter of the spiral structure (e.g., yellow conductive line) has a relatively short path. Since this imbalance is repeated identically on the upper and lower surfaces, the total sum of the lengths of the upper and lower surfaces becomes longer for conductive lines positioned closer to the outer diameter, and the total sum of the lengths of the upper and lower surfaces becomes relatively shorter for conductive lines positioned farther from the outer diameter, resulting in a structure where the length variation between the entire conductive lines accumulates. This imbalance is examined in more detail as shown in Fig. 2 below.

[0028] FIG. 2 is a diagram illustrating the arrangement structure of conductive lines formed on the upper and lower surfaces of a printed circuit board according to the prior art, and the total path length of each pair of conductive lines.

[0029] Referring to FIG. 2, in the prior art, spiral conductive lines are arranged in the same direction on both the upper and lower surfaces, and corresponding lines are connected at the same location in a 1:1 ratio. As a result, both the upper and lower surfaces have the same arrangement structure, and the lengths between the conductive lines are configured to be the same on both the upper and lower surfaces.

[0030] However, in this configuration, the outermost conductive lines have larger rotational radii and longer reachable distances, so the total length of the upper and lower surfaces combined is formed to be longer. For example, as shown in FIG. 2, the outermost conductive line (e.g., red conductive line) is 625 mm on the upper surface and 625 mm on the lower surface, totaling 1250 mm, while the innermost conductive line (e.g., yellow conductive line) is 559 mm on the upper and lower surfaces, totaling 1118 mm.

[0031] As such, a deviation of approximately 130 mm or more occurs in the total path length between the conduction lines, which causes a difference in resistance between the conduction lines and results in an uneven current distribution. Consequently, the current becomes concentrated in the line with relatively lower resistance, and the symmetry of the electromagnetic field is disrupted.

[0032] Therefore, to solve these problems, the present invention proposes an antenna module (100) capable of providing uniformity of current distribution and heat stability by adjusting the arrangement of conductive lines on the upper and lower surfaces and optimizing the design up to the width of each line. Below, the configuration and operation of the antenna module (100) of the present invention are examined through FIGS. 3 and 4.

[0033] FIGS. 3 and FIGS. 4 are configuration diagrams illustrating the configuration of an antenna module (100) according to an embodiment of the present invention with respect to the upper and lower surfaces, respectively.

[0034] An antenna module (100) is a device configured to perform wireless power transmission or reception, and performs the role of forming a magnetic field through a plurality of conductive lines formed on a printed circuit board (110). The present invention focuses on the technical features regarding the arrangement structure and connection method of the conductive lines among the configurations of the antenna module (100), and other components included in the antenna module (100) (e.g., protective layer, insulating layer, electronic components, matching circuit, etc.) may utilize known technologies that can be easily applied by a person with ordinary knowledge in the technical field.

[0035] Meanwhile, FIG. 3 shows a conductive line arranged on the upper surface of a printed circuit board (110) from a view looking at the ground from above, and FIG. 4 shows a conductive line arranged on the lower surface of a printed circuit board (110) by viewing it through the same view looking at the ground from above. The colors of each conductive line are visually different to distinguish the arrangement order of the conductive lines.

[0036] Referring to FIGS. 3 and 4, the antenna module (100) may include a printed circuit board (110), a plurality of conductive lines (120) and vias (130).

[0037] The printed circuit board (110) serves as a support forming the substrate structure of the antenna module (100) and can be utilized as a base layer for forming conductive lines on the upper and lower surfaces. The printed circuit board (110) is made of an insulating material, and, for example, insulating substrate materials such as polyimide, epoxy resin, or FR-4 may be used. Additionally, vias (130) are formed to electrically connect the conductive lines on the upper and lower surfaces of the printed circuit board (110), thereby enabling the conductive lines arranged on both the upper and lower surfaces to be connected in a single loop structure.

[0038] A plurality of conductive lines (120) are conductive patterns arranged in parallel in a spiral structure on the upper and lower surfaces of the printed circuit board (110), respectively, and can form a circuit path formed to allow current to flow. For example, the conductive lines can be formed from a conductive metal material such as copper (Cu), gold (Au), aluminum (Al), or silver (Ag), and in particular, can be formed by a printing process using a metal thin film or metal ink to minimize electrical loss and increase the magnetic field formation efficiency of the antenna module. The plurality of conductive lines (120) can perform the role of forming a magnetic field for the transmission function of the antenna module (100) or receiving a magnetic field induced from the outside and converting it into current. In addition, the conductive lines on the upper surface and the conductive lines on the lower surface can be electrically connected through vias (130) formed on the printed circuit board (110).

[0039] In the case where there are n conductive lines (120) arranged in the antenna module (100) of one embodiment (n is a natural number greater than or equal to 2), each conductive line may be distinguished by terms such as 'first conductive line' to 'n-th conductive line' in the description of the present invention. For convenience of understanding, the invention is described based on four conductive lines using the case where n=4 as an example; however, this is merely for ease of explanation, and the number of conductive lines to which the present invention can be applied is not limited thereto. That is, even if the number of conductive lines increases or decreases, the technical concept of the present invention can be applied in the same way.

[0040] Referring to the upper enlarged area of ​​FIG. 3, the first to fourth conductive lines can be divided into a first group and a second group according to the order in which they are arranged from the outer diameter to the inner diameter of the spiral structure on the upper surface.

[0041] In the present invention, "outer diameter" refers to the radial edge region furthest from the center among the arrangement structures of conductive lines formed spirally on a printed circuit board (110). In other words, it is the starting point or the outermost region of the conductive line, and generally includes the point where the radius of rotation of the conductive line is largest.

[0042] Additionally, "inner diameter" refers to an area close to the center of the arrangement structure of conductive lines formed spirally on a printed circuit board (110), and can be understood as the end point of the conductive line or the innermost area. The inner diameter area can be utilized as a connection point where vias (130) are formed to electrically connect the conductive lines on the upper and lower surfaces, and is a location where changes in the extension rotation direction and arrangement order of multiple conductive lines occur intensively.

[0043] To explain the classification of the aforementioned groups in a general case, k predetermined conductive lines (where k is a natural number smaller than n) arranged in the direction from the outermost diameter to the inner diameter of the upper surface among the first to n conductive lines can be classified as the first group, and in this case, the remaining conductive lines excluding the first group are classified as the second group.

[0044] In the present invention, the example is given with n=4 and k=2. Accordingly, the first and second conductive lines corresponding to the two (k=2) conductive lines that are counted first in the arrangement order from the outer diameter to the inner diameter of the upper surface are classified into the first group, and the remaining third and fourth conductive lines are classified into the second group.

[0045] Referring to the lower enlarged area of ​​FIG. 3, an example antenna module (100) may be formed such that the first group is arranged to extend further inward than the second group on the upper surface, and the arrangement order of the first group and the second group is reversed in the inner diameter area of ​​the upper surface.

[0046] To implement this structure, each conductive line of the first group on the upper surface may be formed to rotate at least one more time than the conductive line of the second group in the inner diameter direction. According to the example in FIG. 3, the first group is formed to rotate seven times and the second group is formed to rotate six times, so the first group is formed to rotate one more time than the second group. Through this structure, the first group is positioned first and rotates on the outer diameter side of the upper surface, and the conductive line of the first group is positioned further inside than the second group in the inner diameter region of the upper surface, so that the arrangement order between groups in the upper enlarged area of ​​FIG. 3 and the arrangement order between groups in the lower enlarged area of ​​FIG. 3 are reversed.

[0047] At this time, the via (130) may be formed in the inner diameter region of the spiral structure formed by a plurality of conductive lines (120) of the printed circuit board (110) so that the first to fourth conductive lines are electrically connected between the upper surface and the lower surface. By electrically connecting the inner diameter end of each conductive line formed on the upper surface and the inner diameter end of the corresponding conductive line formed on the lower surface, the continuity of the circuit can be ensured.

[0048] Additionally, referring to FIG. 4, in one example, the antenna module (100) may have first to fourth conductive lines arranged in a spiral structure opposite to that of the upper surface on the lower surface, based on the view looking from above toward the ground. That is, if the conductive lines formed on the upper surface in FIG. 3 are arranged in a spiral direction in a counterclockwise direction, the conductive lines formed on the lower surface in FIG. 4 are arranged in a spiral direction in a clockwise direction, so that the spiral directions between the upper surface and the lower surface are opposite to each other. Accordingly, the antenna module (100) has the characteristic that the arrangement order of the first group and the second group from the outer diameter to the inner diameter direction on the lower surface is opposite to that of the upper surface.

[0049] According to the structure of FIGS. 3 and 4, the antenna module (100) of the present invention is designed such that the arrangement order of the first group and the second group is reversed in the inner diameter region, and by reversing the arrangement order of each group on the upper and lower surfaces, the total length of each conductive line can be substantially the same across the upper and lower surfaces. That is, the conductive line of the first group, which is relatively long on the upper surface, is arranged short on the lower surface, and the conductive line of the second group, which is relatively short on the upper surface, is arranged long on the lower surface, thereby minimizing the variation in the length of the entire conductive line. The length and current characteristics of each conductive line are examined in more detail as shown in FIG. 5.

[0050] FIG. 5 is a diagram illustrating the arrangement structure of conductive lines formed on the upper and lower surfaces of an antenna module (100) according to one embodiment, and the total path length of each pair of conductive lines.

[0051] Referring to FIG. 5, the first conductive line (R) and the fourth conductive line (Y) each have a total length of 1,124 mm, the second conductive line (B) has a length of 1,121 mm, and the third conductive line (G) also has a length of 1,121 mm. As such, the antenna module (100) of the present invention is designed so that the arrangement order of the first group and the second group is reversed in the inner diameter area, so that the length of each conductive line extending from the upper surface to the lower surface is configured within a deviation range of about 3 mm.

[0052] That is, on the upper surface, the first group (first and second conductive lines) is extended relatively long and the second group (third and fourth conductive lines) is formed short, but on the lower surface, conversely, the first group (first and second conductive lines) is short and the second group (third and fourth conductive lines) is arranged long, so that the total length of each conductive line is adjusted to a similar level. In this way, the antenna module (100) according to one embodiment of the present invention is configured such that the standard deviation of the total length of each conductive line formed across the upper and lower surfaces is 1.5 mm or less, and is designed to minimize the resistance deviation between each conductive line and to distribute the current evenly. Such a configuration allows current to flow within a uniform range for each conductive line, thereby contributing to high-efficiency wireless power transmission without unbalanced heat generation or power loss.

[0053] Meanwhile, when measuring the length of the conductive lines based on a single surface (either the upper or lower surface) of the antenna module (100), the lengths of each conductive line measured based on the single surface are different from each other. For example, according to the example of FIG. 5, the lengths of the first to fourth conductive lines measured based on the upper surface are formed differently from each other, at 617 mm, 592 mm, 529 mm, and 507 mm, respectively.

[0054] Accordingly, additional embodiments of the present invention can minimize deviation in overall resistance by forming the widths of each conductive line differently as shown in FIGS. 6 and 7, thereby correcting the imbalance in length between conductive lines that occurs based on a specific plane.

[0055] FIGS. 6 and 7 are drawings illustrating a structure in which the total length of the conductive lines is balanced by configuring the width of each conductive line differently in an antenna module (100) according to one embodiment.

[0056] Referring to FIGS. 6 and 7, the total length of the conductive lines on a specific surface may vary depending on the arrangement order and the number of rotations. For example, based on the top surface, the conductive lines of the first group are formed to start from the outermost diameter and extend one more turn in the inner diameter direction, so they are formed to be relatively longer than the second group.

[0057] Such differences in length can affect the electrical characteristics of each conductive line, particularly the resistance value. Accordingly, in order to compensate for resistance deviations caused by differences in the length of the conductive lines, the present invention may form a first group of conductive lines that are relatively long on the upper surface with a wide width (e.g., 0.50 ± 0.1 mm) and a second group that is relatively short with a narrow width (e.g., 0.40 ± 0.1 mm).

[0058] In addition, since the conductive lines are arranged in a spiral structure opposite to that of the top surface on the bottom surface, the width of the second group is formed relatively wide and the width of the first group is formed relatively narrow on the bottom surface, so that the resistance characteristics for each conductive line can be uniformly matched overall.

[0059] Through this, electrical imbalances due to the length and position characteristics of each challenge line can be resolved, and more uniform resistance characteristics and stable current distribution can be secured throughout the antenna module (100).

[0060] FIGS. 8 and 9 illustrate a structure for adjusting the Series Inductance (LS) value by adjusting the contact position of the via (130) of the conductive line in an antenna module (100) according to an embodiment of the present invention. Each of FIGS. 8 and 9 shows an integrated structure in which the conductive line of the upper surface is shown in red on the left, the conductive line of the lower surface is shown in yellow in the center, and the structures of the upper and lower surfaces are overlapped and arranged on the right.

[0061] Referring to FIG. 8, the via (130) contact of each conductive line is formed at the 6 o'clock position relative to the inner diameter of the upper surface. Accordingly, the conductive line on the upper surface reaches the contact via a relatively short path, and the overall effective length also tends to be shorter.

[0062] Referring to FIG. 9, the via (130) contact of each conductive line is positioned at the 9 o'clock direction relative to the inner diameter of the upper surface, so that the conductive line on the upper surface is extended and rotated further before reaching the contact. In this case, the effective path of the entire conductive line is increased, and consequently, the LS value can also be increased.

[0063] Thus, the present invention is designed so that the position where the extension rotation is performed on the upper surface and the position where the extension rotation is performed on the lower surface are selectively adjusted, thereby changing the position of the end contact on the inner diameter side of each conductive line (= the position of the via (130)), and accordingly, the entire conductive path of the antenna module (100) is changed, so that the LS value of the entire antenna module (100) can be finely adjusted through the selection of the position of the end contact.

[0064] Here, the LS value is, Therefore, the LS value is determined by N (number of turns of each conductive line), A (effective cross-sectional area of ​​the coil formed by the conductive line - adjusted according to the width of the conductive line), l (average path length of the magnetic field), and u (magnetic field factor). Accordingly, the width of each conductive line and the contact positions of the conductive lines on the upper and lower surfaces can act as important design elements for controlling the LS value. Accordingly, the present invention can provide a technical effect that enables not only the balance of the lengths of each conductive line but also the precise control of the LS value by utilizing the contact positions of the vias (130) as design parameters.

[0065] FIG. 10 is a diagram showing the current and current distribution ratio of an antenna module according to the prior art, FIG. 11 is a diagram showing the current and current distribution ratio flowing in each conductive line in an antenna module (100) according to an embodiment of the present invention in which the width of each conductive line is the same, FIG. 12 is a diagram showing the current and current distribution ratio flowing in each conductive line in an antenna module (100) according to an embodiment of the present invention in which the width of each conductive line is adjusted differently according to the group.

[0066] Referring to FIG. 10, in an antenna module according to the prior art, all conductive lines are configured with the same width and different overall lengths, so the resistance values ​​of each conductive line are different. This indicates that current may be excessively concentrated in some conductive lines, which may cause heat generation or loss and potentially reduce the stability and efficiency of the entire system.

[0067] Referring to FIG. 11, the embodiment of FIG. 11 is configured such that each conductive line has the same width (e.g., 0.5 mm), and the arrangement order of the conductive lines on the upper and lower surfaces is controlled to minimize the variation in the overall length. Accordingly, it can be confirmed that the variation in resistance between conductive lines is reduced, and the flow of current is distributed more evenly compared to the prior art.

[0068] Referring to FIG. 12, the embodiment of FIG. 12 is a structure in which the resistance is adjusted more precisely by adjusting the width of the conductive lines formed on the upper and lower surfaces differently for each group, in addition to the arrangement order-based structure of FIG. 11. For example, the first and second conductive lines are configured to be 0.51 mm on the upper surface and 0.41 mm on the lower surface, and the third and fourth conductive lines are configured to be 0.41 mm on the upper surface and 0.51 mm on the lower surface, so that the total resistance of each conductive line can be designed to be almost identical through the reversal of the arrangement order and width adjustment together. As a result, the configuration of FIG. 12 is the best in terms of the balance of current distribution, and it can be confirmed that the current distribution ratio is actually maintained almost completely uniformly within the range of 24.99% to 25.01%.

[0069] Accordingly, through a comparison of FIGS. 10 to 12, it can be seen that the present invention can precisely control the resistance and current distribution of each conductive line by designing not only the arrangement order of the conductive lines but also the width control, thereby minimizing heat generation or loss and significantly improving the efficiency and stability of the system.

[0070] According to the above-described embodiment, the present invention can configure the total path length of each conductive line substantially uniformly by arranging a plurality of conductive lines (120) formed on the upper and lower surfaces of a printed circuit board (110) in an asymmetrical order. Accordingly, the distribution of current flowing through each line can be maintained evenly, thereby effectively preventing risks such as overheating, overloading, and insulation breakdown that may occur due to current concentration in a specific line.

[0071] In addition, even for internal structures on the top or bottom surfaces where the physical length of each conduction line inevitably varies, resistance values ​​can be precisely corrected by adjusting the width per line, thereby resolving current imbalance issues that may occur within the same surface.

[0072] As such, the uniformization of current distribution minimizes power loss and contributes to reducing electromagnetic interference that may occur due to magnetic field asymmetry, thereby ensuring both the efficiency and electromagnetic stability of the entire wireless power transmission system. Furthermore, as heat is evenly distributed, thermal stress on system components is alleviated, which can be expected to improve the durability and lifespan of the device.

[0073] The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more items unless the relevant context clearly indicates otherwise.

[0074] In this document, each of the phrases such as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B or C,” “at least one of A, B and C,” and “at least one of A, B, or C” may include all possible combinations of items listed together in the corresponding phrase. Terms such as “1,” “2,” or “first” or “second” may be used simply to distinguish a component from another component and do not limit the components in any other aspect (e.g., importance or order). Where any (e.g., 1st) component is referred to as “coupled” or “connected” to another (e.g., 2nd) component, with or without the terms “functionally” or “communicationly,” it means that the component may be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0075] As used in this document, the term "module" may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be a component formed integrally, or a minimum unit of a component or part thereof that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0076] According to various embodiments, each component (e.g., module or program) of the described components may include a singular or multiple entities. According to various embodiments, one or more of the components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Generally or additionally, multiple components (e.g., module or program) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the components of the multiple components in the same or similar manner as they were performed by the corresponding component among the multiple components prior to integration. According to various embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically; one or more of the operations may be executed in a different order; omitted; or one or more other operations may be added. Explanation of the symbols

[0077] 100: Antenna module 110: Printed circuit board 120: Multiple Challenge Lines 130: Via

Claims

Claim 1 An antenna module comprising: a printed circuit board; first to n conductive lines (n is a natural number greater than or equal to 2) arranged in parallel in a spiral structure on the upper and lower surfaces of the printed circuit board; and vias formed in the inner diameter region of the spiral structure of the printed circuit board so as to electrically connect the first to n conductive lines between the upper surface and the lower surface, wherein when the first to n conductive lines are divided into a first group and a second group according to the order in which they are arranged from the outer diameter to the inner diameter direction of the spiral structure on the upper surface, the first group is arranged to extend and rotate further toward the inner diameter side than the second group on the upper surface so as to reverse the arrangement order of the first group and the second group in the inner diameter region of the upper surface, and the first to n conductive lines are arranged in a spiral structure opposite to the direction of the upper surface on the lower surface so as to reverse the arrangement order of the first group and the second group from the outer diameter to the inner diameter direction of the lower surface. Claim 2 An antenna module according to claim 1, wherein on the upper surface, the width of the conductive line of the first group is formed to be wider than or equal to the width of the conductive line of the second group, and on the lower surface, the width of the conductive line of the second group is formed to be wider than or equal to the width of the conductive line of the first group. Claim 3 An antenna module according to claim 1, wherein the first to nth conductive lines are formed such that the position of the contact point where the inner diameter end of the first to nth conductive lines formed on the upper surface and the inner diameter end of the first to nth conductive lines formed on the lower surface are connected to each other is adjusted, thereby enabling adjustment of the LS (Inductance Series) value of the antenna module. Claim 4 An antenna module according to claim 1, wherein the first to nth conductive lines are formed such that the standard deviation for each length extending from the upper surface to the lower surface is 1.5 mm or less. Claim 5 An antenna module according to claim 1, wherein the first group comprises k predetermined conductive lines (k is a natural number smaller than n) arranged in the direction from the outermost diameter of the upper surface to the inner diameter among the first to n conductive lines, and the second group comprises the remaining conductive lines among the first to n conductive lines excluding the first group.

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