Non-contact antenna and intelligent POS terminal

Abstract

The utility model discloses a non -contact antenna, through the unique coil layout mode of design in blind area position, increase the coupling degree of PCD antenna and PICC antenna, the magnetic field superposition technology of innovation, effectively eliminated the problem of non -contact read -only card identification blind area that exists in traditional big read -only card area, make the magnetic field distribution in whole read -only card area be more even, stable, has promoted read -only card success rate.

Description

Technical Field

[0001] This utility model belongs to the field of intelligent device technology, and in particular relates to a contactless antenna and an intelligent POS terminal. Background Technology

[0002] With the rapid development of mobile payment and smart card technologies, contactless payment based on Near Field Communication (NFC) and Radio Frequency Identification (RFID) technologies has become one of the mainstream payment methods. POS (Point of Sale) terminals, as the core equipment for completing transactions, generally integrate contactless card reader modules, allowing users to quickly complete payments by "waving their cards," greatly improving transaction efficiency and user experience.

[0003] To improve user convenience and error tolerance, the design trend of modern POS terminals is to maximize the sensing area of ​​contactless card readers (often referred to as the "contactless reading area"). However, in the practical design of achieving a large reading area, a significant technical challenge has become increasingly apparent: the problem of blind spots. Traditional antenna designs (such as a single large coil) optimize blind spots by increasing the field strength, which means that the field strength in all areas will increase accordingly. The magnetic field is often strongest and the recognition effect is best in the physical center area, while the effect deteriorates in areas far from the center. Although users may swipe their cards across the entire large area, the success rate is not uniform, and there are still obvious "hot spots" and "blind spots."

[0004] In summary, existing POS terminals with large contactless card reading areas generally face the problem of recognition blind spots (especially difficulties in recognizing edge / corner areas), and existing solutions (such as a single large coil) have limited effectiveness. Therefore, there is an urgent need for a contactless antenna that can significantly improve recognition sensitivity within the card reading area (especially at the edges and corners) and effectively eliminate or greatly reduce recognition blind spots. Summary of the Invention

[0005] The purpose of this invention is to solve the problem of uneven field strength in the sensing area of ​​contactless card readers, which leads to blind spots in card recognition, and to provide a contactless antenna and a smart POS terminal.

[0006] This utility model provides a non-contact antenna, which is a multi-turn loop antenna made of wire, including a first coil, a second coil, and a third coil. The first coil is located inside the area enclosed by the second coil or the third coil and is connected to the second coil, with the first coil overlapping a portion of the area of ​​the second coil and the third coil; The second coil is located outside the area enclosed by the first coil and is connected to both the first coil and the third coil, with a portion of the second coil overlapping the third coil. The third coil is located outside the area enclosed by the first coil and is connected to the second coil, with a portion of the third coil completely overlapping the first coil; The current flows in the first coil, the second coil, and the third coil in the same direction. The inductance value of the contactless antenna is the sum of the inductance values ​​of the first coil, the second coil, and the third coil, and the inductance value of the contactless antenna satisfies a preset value.

[0007] This utility model also provides an intelligent POS terminal, which includes the aforementioned contactless antenna, which is installed in the internal circuit of the POS terminal.

[0008] The beneficial effects of the technical solution provided by this utility model include at least the following: This utility model provides a contactless antenna and intelligent POS terminal. By designing a unique coil layout in the blind spot area, it increases the coupling between the PCD antenna and the PICC antenna. Innovative magnetic field superposition technology effectively eliminates the blind spot problem inherent in traditional large card-reading areas, resulting in a more uniform and stable magnetic field distribution throughout the entire reading area, thus improving the card reading success rate. Simultaneously, this solution effectively improves the uniformity and coverage of card reading performance without significantly increasing device size or antenna space occupation. Users can obtain highly consistent and reliable recognition results when waving payment devices (bank cards, mobile phones, etc.) throughout the entire reading area (including traditional edges and corners), significantly improving the first-time card-swiping success rate and avoiding transaction failures or repeated operations due to inaccurate placement, thereby enhancing user experience and payment efficiency. Attached Figure Description

[0009] To illustrate this more clearly, the embodiments of the present invention or the prior art will be briefly described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of a non-contact antenna structure provided in Embodiment 2 of this utility model; Figure 2 , Figure 3 This is a schematic diagram of the structure of a non-contact antenna on a PCB board according to Embodiment 2 of this utility model; Figure 4 This is a schematic diagram of a non-contact antenna structure provided in Embodiment 3 of this utility model. Detailed Implementation

[0011] To make the objectives, technical solutions and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0012] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of devices and methods consistent with some aspects of this invention as detailed in the appended claims. Example 1

[0013] Embodiment 1 of this utility model provides a non-contact antenna, which is a multi-turn loop antenna made of wire, including a first coil, a second coil, and a third coil; The first coil is located inside the area enclosed by the second or third coil and is connected to the second coil, with partial overlap between the first coil and the second and third coils; the second coil is located outside the area enclosed by the first coil and is connected to the first and third coils, with partial overlap between the second coil and the third coil; the third coil is located outside the area enclosed by the first coil and is connected to the second coil, with partial overlap between the third coil and the first coil; the current flows in the first, second, and third coils in the same direction, and the inductance value of the unconnected antenna is the sum of the inductance values ​​of the first, second, and third coils, and the inductance value of the unconnected antenna satisfies a preset value to achieve stable matching at a predetermined frequency. Example 2

[0014] Embodiment 2 of this utility model provides a contactless antenna, such as... Figure 1 As shown, the non-contact antenna is a multi-turn loop antenna made of wire, including a first coil 101, a second coil 102 and a third coil 103; The first coil 101 is located inside the area enclosed by the second coil 102 or the third coil 103, and is connected to the second coil 102. The first coil 101 overlaps with a portion of the second coil 102 and the third coil 103. The first coil 101 has a first intersection 104, which includes a first connecting part 105 and a second connecting part 106. The first coil 101 is connected to the second coil through the first connecting part 105 and the second connecting part 106. The second coil 102 is located outside the area enclosed by the first coil 101 and is connected to the first coil 101 and the third coil 103. Parts of the second coil 102 and the third coil 103 overlap. The second coil 102 has a second intersection 107 and a third intersection 110. The second intersection 107 includes a third connecting portion 108 and a fourth connecting portion 109. The third intersection 110 includes a fifth connecting portion 111 and a sixth connecting portion 112. The second coil 102 is connected to the first connecting portion 105 and the second connecting portion 106 of the first coil through the third connecting portion 108 and the fourth connecting portion 109, respectively. The second coil 102 is connected to the third coil 103 through the fifth connecting portion 111 and the sixth connecting portion 112. The third coil 103 is located outside the area enclosed by the first coil 101 and is connected to the second coil 102. A portion of the third coil 103 completely overlaps with either the first coil 101 or the second coil 102. The third coil 103 has a fourth intersection 113, which includes a seventh connecting part 114 and an eighth connecting part 115. The third coil 103 is connected to the fifth connecting part 111 and the sixth connecting part 112 of the second coil 102 through the seventh connecting part 114 and the eighth connecting part 115, respectively. The third coil 103 also includes a ninth connecting part 116 and a tenth connecting part 117, which are connected to other circuit components respectively.

[0015] In this embodiment, the non-contact antenna is specifically a linear coil and is obtained by winding a wire a preset number of turns. The shape obtained by winding is a square or a U-shape. The current flows of the first coil 101, the second coil 102 and the third coil 103 in the non-contact antenna are the same. In this embodiment, the first coil 101 is located in the middle of the second coil 102 or the third coil 103, and the spacing and length between the coils are determined by the inductance and the resonant frequency of the matching circuit. In this embodiment, the current flows in the first coil, the second coil, and the third coil in the same direction; In this embodiment, the inductance value of the non-contact antenna is the sum of the inductance values ​​of the first coil, the second coil, and the third coil, and the inductance value of the non-contact antenna needs to meet a preset value in order to achieve stable matching at a predetermined frequency. Specifically, the predetermined frequency is 13.56MHz; Preferably, such as Figure 1 The contactless antenna shown has an inductance of 900 to 1500 nanohenries. The rectangle formed by the first coil 101 has a length of 50 to 90 mm and a width of 70 to 78 mm; the rectangle formed by the second coil 102 has a length of 100 to 120 mm and a width of 70 to 78 mm; and the rectangle formed by the third coil 103 has a length of 157 to 161 mm and a width of 70 to 78 mm.

[0016] Based on the principle of electromagnetic induction, the generated current will generate a magnetic field around the coil through the wire. The magnetic field generated by the loop coil formed by the wire converges in the area surrounded by the coil. Compared with the prior art, the solution provided in this embodiment reduces the area surrounded by the coil by arranging the first coil in the central area of ​​the antenna, thereby enhancing the field strength in the central area. The arrangement of the second and third coils enhances the field strength in the edge area, thereby reducing the blind spot of the contactless card.

[0017] Specifically, such as Figure 1 As shown, the distance between the relative wires in the first coil cannot be less than the first preset value and cannot be greater than the second preset value, because the current directions between the relative coils are opposite. If the distance is too close, the currents on the coils will cancel each other out. At the same time, the magnetic field strength on the coil is determined by the magnetic field radius. The farther away from the coil, the weaker the magnetic field. So if the distance is too far, the magnetic fields between the coils cannot converge, resulting in a blind spot for recognition. The first and second preset values ​​are determined based on the magnetic field strength on the coil.

[0018] The contactless antenna is made by winding a conductor. Specifically, one feasible method is to use copper wire or a connecting wire on a PCB board, such as... Figure 2 and Figure 3 The diagram shows a non-contact antenna structure on a PCB board. Example 3

[0019] Embodiment 3 of this utility model provides a contactless antenna, such as... Figure 4 As shown, the non-contact antenna is a multi-turn loop antenna made of wire, including a first coil 201, a second coil 202 and a third coil 203; The first coil 201 is located inside the area enclosed by the second coil 202 or the third coil 203, and is connected to the second coil 202. The first coil 201 overlaps with a portion of the second coil 202 and the third coil 203. The first coil 201 has a fifth intersection 204, which includes an eleventh connecting part 205 and a twelfth connecting part 206. The first coil 201 is connected to the second coil 202 through the eleventh connecting part 205 and the twelfth connecting part 206. The second coil 202 is located outside the area enclosed by the first coil 201 and is connected to the first coil 201 and the third coil 203. Parts of the second coil 202 and the third coil 203 overlap. The second coil 202 has a sixth intersection 207 and a seventh intersection 210. The sixth intersection 207 includes a thirteenth connecting part 208 and a fourteenth connecting part 209. The seventh intersection 210 includes a fifteenth connecting part 211 and a sixteenth connecting part 212. The second coil 202 is connected to the eleventh connecting part 205 and the twelfth connecting part 206 of the first coil 201 through the thirteenth connecting part 208 and the fourteenth connecting part 209, respectively. The second coil 202 is connected to the third coil 203 through the fifteenth connecting part 211 and the sixteenth connecting part 212. The second coil 202 also includes a seventeenth connecting part 213 and an eighteenth connecting part 214, which are respectively connected to other circuit components; The third coil 203 is located outside the area enclosed by the first coil 201 and is connected to the second coil 202. Part of the third coil 203 completely overlaps with the first coil 201 and partially overlaps with the second coil 202. The third coil 203 has an eighth intersection 215, which includes a nineteenth connecting part 216 and a twentieth connecting part 217. The third coil 203 is connected to the fifteenth connecting part 211 and the sixteenth connecting part 212 of the second coil 202 through the nineteenth connecting part 216 and the twentieth connecting part 217, respectively.

[0020] In this embodiment, the non-contact antenna is specifically a linear coil and is obtained by winding a wire a preset number of turns. The shape obtained by winding is either a square or a rectangular shape. The current flows of the first coil 201, the second coil 202 and the third coil 203 in the non-contact antenna are the same. In this embodiment, the spacing and length between the first coil 201, the second coil 202, and the third coil 203 are determined by the inductance and the resonant frequency of the matching circuit.

[0021] Preferably, such as Figure 4 The contactless antenna shown has an inductance of 900 to 1500 nanohenries. The rectangle formed by the first coil 201 has a length of 50 to 80 mm and a width of 70 to 78 mm; the rectangle formed by the second coil 202 has a length of 100 to 120 mm and a width of 70 to 78 mm; and the rectangle formed by the third coil 203 has a length of 100 to 120 mm and a width of 70 to 78 mm.

[0022] Based on the principle of electromagnetic induction, the generated current will generate a magnetic field around the coil through the wire. The magnetic field generated by the loop coil formed by the wire converges in the area surrounded by the coil. Compared with the prior art, the solution provided in this embodiment reduces the area surrounded by the coil by arranging the first coil in the central area of ​​the antenna, thereby enhancing the field strength in the central area. The arrangement of the second and third coils enhances the field strength in the edge area, thereby reducing the blind spot of the contactless card.

[0023] This utility model also provides an intelligent POS terminal, which includes the contactless antenna described in the above embodiments, and the contactless antenna is installed in the internal circuit of the POS terminal.

[0024] By employing the contactless antenna provided by this invention, the problem of blind spots in traditional large card reader areas can be effectively eliminated, resulting in a more uniform and stable magnetic field distribution throughout the entire reading area, thus improving the card reading success rate. Simultaneously, this solution effectively improves the uniformity and coverage of card reading performance without significantly increasing device size or antenna space occupation. Users can obtain highly consistent and reliable recognition results when waving payment devices (bank cards, mobile phones, etc.) throughout the entire reading area (including traditional edges and corners), significantly improving the first-time card-swiping success rate and avoiding transaction failures or repeated operations due to inaccurate placement, thereby enhancing user experience and payment efficiency.

[0025] It should be noted that in this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or order; the term "multiple" refers to two or more, unless otherwise explicitly defined. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the referred or unit must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, equivalent variations made according to the claims of this utility model still fall within the scope of this utility model.

Claims

1. A contactless antenna, characterized in that, The non-contact antenna is a multi-turn loop antenna made of wire, including a first coil, a second coil, and a third coil. The first coil is located inside the area enclosed by the second coil or the third coil and is connected to the second coil, with the first coil overlapping a portion of the area of ​​the second coil and the third coil; The second coil is located outside the area enclosed by the first coil and is connected to both the first coil and the third coil, with a portion of the second coil overlapping the third coil. The third coil is located outside the area enclosed by the first coil and is connected to the second coil, with a portion of the third coil completely overlapping the first coil; The current flows in the first coil, the second coil, and the third coil in the same direction. The inductance value of the contactless antenna is the sum of the inductance values ​​of the first coil, the second coil, and the third coil, and the inductance value of the contactless antenna satisfies a preset value.

2. A contactless antenna as described in claim 1, characterized in that, The first coil has a first intersection, the first intersection including a first connecting part and a second connecting part, and the first coil is connected to the second coil through the first connecting part and the second connecting part; The second coil has a second intersection and a third intersection. The second intersection includes a third connecting part and a fourth connecting part. The third intersection includes a fifth connecting part and a sixth connecting part. The second coil is connected to the first connecting part and the second connecting part of the first coil through the third connecting part and the fourth connecting part, respectively. The second coil is connected to the third coil through the fifth connecting part and the sixth connecting part. A portion of the third coil completely overlaps with either the first or the second coil. The third coil has a fourth intersection, which includes a seventh connection and an eighth connection. The third coil is connected to the fifth connection and the sixth connection of the second coil through the seventh connection and the eighth connection, respectively. The third coil also includes a ninth connection part and a tenth connection part, which are respectively connected to other circuit elements.

3. A contactless antenna as described in claim 1, characterized in that, The first coil has a fifth intersection, which includes an eleventh connecting part and a twelfth connecting part. The first coil is connected to the second coil through the eleventh connecting part and the twelfth connecting part. The second coil has a sixth intersection and a seventh intersection. The sixth intersection includes a thirteenth connection and a fourteenth connection. The seventh intersection includes a fifteenth connection and a sixteenth connection. The second coil is connected to the eleventh connection and the twelfth connection of the first coil through the thirteenth connection and the fourteenth connection, respectively. The second coil is connected to the third coil through the fifteenth connection and the sixteenth connection. The second coil also includes a seventeenth connecting portion and an eighteenth connecting portion, which are respectively connected to other circuit elements; A portion of the third coil completely overlaps with the first coil and partially overlaps with the second coil. The third coil has an eighth intersection, which includes a nineteenth connecting part and a twentyth connecting part. The third coil is connected to the fifteenth connecting part and the sixteenth connecting part of the second coil through the nineteenth connecting part and the twentyth connecting part, respectively.

4. A contactless antenna as described in claim 2, characterized in that, The inductance of the contactless antenna is 900 to 1500 nanohenries. The rectangle formed by the first coil has a length of 50 to 90 mm and a width of 70 to 78 mm. The rectangle formed by the second coil has a length of 100 to 120 mm and a width of 70 to 78 mm. The rectangle formed by the third coil has a length of 157 to 161 mm and a width of 70 to 78 mm.

5. A contactless antenna as described in claim 3, characterized in that, The inductance of the contactless antenna is 900 to 1500 nanohenries. The rectangle formed by the first coil has a length of 50 to 80 mm and a width of 70 to 78 mm. The rectangle formed by the second coil has a length of 100 to 120 mm and a width of 70 to 78 mm. The rectangle formed by the third coil has a length of 100 to 120 mm and a width of 70 to 78 mm.

6. A smart POS terminal, characterized in that, The smart POS terminal includes a contactless antenna, which is the contactless antenna as described in any one of claims 1 to 5. The contactless antenna is installed in the internal circuit of the POS terminal, and the POS terminal realizes the identification function of contactless IC cards through the contactless antenna.

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