KR101265300B1 - Loop antenna for nfc and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A loop antenna manufacturing method for NFC(Near Field Communication) is provided to control the distance between loops and the distance between patterns to be identical, thereby implementing extension of a bandwidth. CONSTITUTION: One surface of a first remove sheet is laminated(S101). An adhesive of a first copper foil is coated on the first remove sheet. A first loop antenna pattern is formed by etching the first copper foil(S102). An insulator adheres to an initial end and an end of the first loop antenna pattern(S103). A terminal unit is plated with a conductive metal(S104). [Reference numerals] (AA) Start; (BB) End; (S101) Laminate a cooper foil and a remove sheet; (S102) Form a pattern; (S103) Adhere an insulator; (S104) Jump and plate a terminal unit; (S105) Laminate a ferrite sheet; (S106) Remove the remove sheet; (S107) Attach a release paper

Description

Loop antenna for NFC and manufacturing method

The present invention relates to a method for manufacturing a loop antenna for NFC, and more particularly, to produce a loop antenna for NFC, which is manufactured on both sides, in a cross-section, and to simplify the configuration to reduce manufacturing labor and material costs It relates to a method of manufacturing a loop antenna for NFC.

A mobile terminal for mobile communication is a terminal for wirelessly communicating with a desired party anytime and anywhere while moving freely in a service area formed by a base station for mobile communication, and will be described as a "mobile terminal" in the following description.

The mobile terminal generally includes a plurality of functions such as a camera, an MP3, a recorder, an e-book, etc. in addition to a wireless communication function, and when the mobile terminal has a terrestrial DMB function, it is possible to watch TV broadcasts.

In particular, in recent years, the navigation function to add a GPS antenna and combine with an electronic map to provide the direction of movement and current location information, and the cost of financial transactions by commerce through wireless access in the NFC method at close range. A smart card function for electronic payment, such as a credit card, has been developed and added, and further development may continue, and new functions may be added in the future.

In general, mobile communication uses the frequency bands of 800 MHz and 1.8 GHz, GPS uses the 1.57 GHz and 1.22 GHz frequency bands, and terrestrial DMB uses the 174-214 MHz band, and uses Wi-Fi (WiFi) and The Bluetooth method uses a frequency band of 2.4 GHz, and the NFC of the near field communication uses a frequency of 13.56 MHz.

In particular, the antenna for NFC has been able to minimize the length and volume of the antenna for transmitting and receiving short-range wireless by manufacturing a loop type antenna in recent years. Such conventional loop antennas are manufactured from flexible loop antennas in which ferrite sheets, copper foils, protective films, and double-sided tapes are sequentially stacked, as described in Patent Registration No. 1079838 and Patent Publication No. 2009-0043077. It is becoming.

Such a conventional NFC loop antenna can be easily adhered to the inside of the case of the mobile terminal by the adhesive force of the double-sided tape is preferred by the mobile terminal manufacturers.

Here, the conventional NFC antenna includes a ferrite, a copper foil, a protective film, and a double-sided tape as essential components, and in particular, a first terminal part connected to an end and extending from one side of the substrate to form a loop, starting with Each of the second terminal portion connected to the stage is included.

In order to extend the second terminal portion connected to the start end of the loop, the NFC loop antenna needs to extend the second terminal portion to the opposite surface of the substrate through the through hole.

Therefore, the conventional NPS loop antenna is formed so that the terminal is pulled out through the opposite side through the through hole, and thus the manufacturing labor is increased. As a result, the supply cost is limited due to the increase in manufacturing cost. Due to fierce competition among peers, the profits of companies are gradually decreasing, so it is urgent to develop technologies that can reduce manufacturing costs.

The present invention has been made to solve the conventional problems as described above, an object of the present invention is to construct a loop antenna for the NFC, while at the same time simplify the components to reduce the manufacturing cost of the NFC antenna loop antenna In providing.

In addition, another object of the present invention is to form a loop antenna on the cross-section of the loop antenna for NFC, the gap between the first loop antenna and the second loop antenna, and the copper foil forming the first loop antenna and the second loop antenna It is to provide a method for manufacturing a loop antenna for the NFC that can increase the bandwidth and increase the gain by adjusting the thickness.

The present invention includes the following embodiments in order to achieve the above object.

The first embodiment of the present invention includes a limb lamination step of laminating the first copper foil on one surface of the first removable sheet to which the adhesive liquid is applied; A first pattern forming step of forming a first loop antenna pattern using any one of etching, sputtering, punching, and printing processes of the first copper foil; Bonding the insulating means to the insulating means in a region where terminal portions formed at the start and end portions of the first loop antenna pattern overlap with each other; A terminal part jumping and plating step of attaching a terminal part formed at the end of the first loop antenna pattern to the insulating means after the insulating means bonding step and drawing it to the outside and plating with a conductive metal; A ferrite sheet laminating step of adhering the ferrite sheet to the upper surface of the first loop antenna pattern after the jumping and plating of the terminal unit; A remove sheet removing step of removing the remove sheet; And a release paper bonding step of bonding the release paper on the bottom surface of the antenna pattern.

In a second embodiment of the present invention, the method for manufacturing the loop antenna for NFC is to etching, sputtering, punching the second copper foil after laminating the second copper foil on one surface of the second remove sheet coated with the adhesive liquid. And forming a second loop antenna pattern using any one of printing and laminating the second loop antenna pattern by removing the second rib sheet and laminating the second loop antenna pattern on the first rib sheet. It further includes.

In a third embodiment of the present invention, the first loop antenna pattern and the second loop antenna pattern are preferably formed to have the same thickness.

In a fourth embodiment of the present invention, the first loop antenna pattern is drawn outward while forming a loop at a start end located inside one surface of the first remove sheet to form an end at the outermost side. The second terminal portion formed at the end is attached to the insulating means and is drawn out to the outside where the end is located, and the second loop antenna pattern forms one or more loops starting from the center of the first remove sheet. It is characterized by.

In a fifth embodiment of the present invention, the first loop antenna pattern is drawn outward while forming a loop at a start end located inside one surface of the remove sheet to form an end at the outermost side. The second terminal portion is formed to be bonded to the insulating means to be drawn out to the outside of the end position, the second loop antenna pattern is characterized in that the patch-shaped antenna patch-shaped bonded to the center of one surface of the first remove sheet It is done.

In the sixth embodiment of the present invention, the inter-loop distance L1, which is a distance between the first loop antenna pattern and the second loop antenna pattern, is the same as the distance L2 between the first loop antenna patterns. .

In the seventh embodiment of the present invention, the inter-loop distance L1 is a distance from the innermost pattern of the first loop antenna pattern to the outermost pattern of the second loop antenna and is within 0.12 to 2.05 mm. It is preferable to form.

In the eighth embodiment of the present invention, the second loop antenna pattern is characterized in that the closed area corresponding to 60 to 80% in proportion to the closed area of the first loop antenna pattern.

The present invention can reduce the raw material cost because the loop antenna can be manufactured using a low-cost remove sheet instead of the expensive protective film, and also the terminal part of the loop antenna can be drawn out through the insulating means instead of the through-hole, so that the manufacturing labor time and time are increased. There is an effect that can save the manufacturing cost.

In addition, the present invention adjusts the distance between loops, which is the distance between the first loop antenna pattern and the second loop antenna pattern, and the distance between the pattern and the pattern in the first loop antenna pattern to increase the bandwidth and increase the gain. It works.

1 is a flow chart showing a first embodiment in a method of manufacturing an NFC loop antenna according to the present invention,
Figure 2 is a cross-sectional view showing a first embodiment in the method of manufacturing an NFC loop antenna according to the present invention,
3A to 3C are plan views showing step-by-step jumping steps of the terminal of the first embodiment in the method of manufacturing an NFC loop antenna according to the present invention;
Figure 4 is a flow chart showing a second embodiment in the method of manufacturing a loop antenna for NFC in accordance with the present invention,
5 is a cross-sectional view showing a second embodiment step by step in the manufacturing method of the NFC loop antenna according to the present invention;
FIG. 6 is a view illustrating a first loop antenna pattern and a second loop antenna pattern in a method of manufacturing an NFC loop antenna according to the present invention.

Hereinafter, an NFC loop antenna and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a flow chart showing a first embodiment in a method of manufacturing an NFC loop antenna according to the present invention, Figure 2 is a cross-sectional view showing a first embodiment in the method for manufacturing a loop antenna for NFC according to the present invention. .

The loop antenna for NFC in accordance with the present invention starts from one side of the substrate and extends outward to form one or more loops, and the beginning and end of the loop are, for example, an NFC controller (shown in the drawing). And the first terminal part 111 and the second terminal part 112 are respectively formed to conduct an electrical signal.

In the present invention, the second terminal portion 112 extending at the start end is drawn out to the outside of the loop in which the first terminal portion 111 is located. In this case, in the related art, in order to draw the second terminal portion 112 to the outside of the loop as described above, a second terminal portion is formed on the opposite side of the substrate by forming a through hole (not shown).

The present invention bonds the insulating means 12 between the start end and the end of the antenna pattern 11 in place of the through hole, and the second terminal portion 112 connected to the start end through an upper surface of the insulation means 12. It is characterized in that the withdrawn to the outside.

Such an NFC loop antenna is manufactured through a process according to the flowchart illustrated in FIG. 1.

1 and 2, a method of manufacturing an NFC loop antenna according to the present invention includes a removal lamination step (S101) of laminating a copper foil 10 to a rib, and an antenna pattern on the copper foil 10. 11) to form a pattern forming step (S102), the insulating means bonding step (S103) for bonding the insulating means 12 to the region where the terminal portion overlaps in the antenna pattern 11, and jumps the terminal portions (111, 112) After the jump and plating step (S104), and the ferrite sheet lamination step (S105) for adhering the ferrite sheet 30 to the upper surface of the antenna pattern 11, and removing the remove sheet 20 The sheet removal step (S106), and the release paper bonding step (S107) for bonding the release paper 42 on the lower surface of the antenna pattern (11).

The remove lamination step (S101) is a step of adhering the copper foil 10 to one surface of the remove sheet 20 to which the adhesive liquid is applied to one surface. Here, the remover sheet (Remover sheet) is a detachable adhesive sheet having a paper material or a metal material in which an adhesive layer on which one side of the copper foil 10 is bonded is formed. In addition, the copper foil 10 is bonded to one surface on which the adhesive layer of the remove sheet 20 is formed after being cut into a predetermined size and shape according to the area of the remove sheet 20 by a cutting and forming apparatus.

The pattern forming step (S102) is a step of forming the pattern 11 of the loop antenna as one of etching, sputtering, punching, and printing techniques of the copper foil 10 laminated with the remove sheet 20. The copper foil 10 is formed by the pattern 11 of the loop antenna as shown in (b) of FIG. 2 and in FIGS. 3A and 3B. Here, the pattern 11 of the loop antenna starts at the inner side and forms a loop at the outer side so that the end thereof is located at the outer side. The loop antenna pattern 11 forms a first terminal portion 111 and a second terminal portion 112 at the start end and the end end, respectively. The first terminal portion 111 is formed at the end of the loop antenna and is located outside the loop antenna pattern 11, and the second terminal portion 112 is formed at the start end and positioned inside the loop antenna.

Insulating means attaching step (S103) is the insulating means so that the second terminal portion 112 is not in contact with the pattern 11 of the loop antenna when the second terminal portion 112 to jump out to the outside of the loop antenna. Step 12 is attached. The insulating means 12 is, for example, an insulating tape, which is attached to an upper surface of an area that can be in contact with the antenna pattern 11 when the second terminal portion 112 jumps outward. Electrical contact between 112 and the antenna pattern 11 is prevented.

That is, the present invention improves the technique of conventionally drawing out the second terminal portion 112 to the outside to draw out to the opposite side by attaching the insulating means 12 instead of the through hole to the other side of the side Can be withdrawn from the outside.

The terminal jumping and plating step (S104) is to switch the second terminal portion 112 located in the inside of the loop antenna pattern 11 in the opposite direction after the attaching step (S103) of the insulating means 12 to the insulating means The step of drawing out to the outside while in close contact with the upper surface of (12). This is as shown in Figure 3c.

Referring to FIG. 3C, the second terminal part 112 is bent in an opposite direction by an operator or a tool in a state in which the second terminal part 112 is located in close contact with an upper surface of the insulating means 12 bonded to the loop antenna pattern 11. It is drawn outward. In this case, since the second terminal portion 112 is electrically energized by the insulating means 12, the through hole forming process may be omitted. When the jump of the second terminal portion 112 is completed as described above, the first terminal portion 111 and the second terminal portion 112 are plated. In this case, the plating is performed by using lead, tin, and gold, which are conductive metals, in order to increase the electrical conductivity of the terminal part, and the description thereof is omitted according to a generally known technique.

As described above, the ferrite lamination step S105 is performed when the drawing and plating of the second terminal portion 112 are completed, and the ferrite sheet is formed on the upper surface of the antenna pattern 11 on the opposite side of the remove sheet 20. 30 is the step of laminating.

The remove the remove sheet (S106) is a step of removing the remove sheet 20 adhered to the bottom surface of the antenna pattern 11 on the opposite side of the ferrite sheet 30 after the ferrite lamination step S105. . Here, the remove sheet 20 is removed from the loop antenna pattern 11 when the operator grasps the tip and applies a force as the adhesive sheet is made of paper or a metal material coated with an adhesive solution. This is as shown in (d) of FIG.

The release paper bonding step (S107) is to adhere the release paper 42 to form the adhesive layer 41 by applying the adhesive liquid on one surface after the removal of the removable sheet (S106) to the lower surface of the loop antenna pattern 11 Step, which is as shown in step (e) of FIG. Here, the release paper 42 is a double-sided tape 40, the loop antenna pattern 11 completed through the same process as described above in close contact and fixed inside the case of the terminal for NFC.

An operator grasps the end of the release paper 42 to release the release paper 41 from the adhesive layer 41, and expose the adhesive layer 41 to air. Therefore, the operator adheres and presses the adhesive layer 41 exposed after the release paper 42 is removed to the inner surface of the NFC terminal, thereby fixing the loop antenna to the NFC terminal.

As described above, the method of manufacturing the loop antenna for NFC according to the present invention does not use the protective film as in the prior art, and removes the ferrite sheet lamination step (S105) using the removable sheet 20 bonded in the first step. Therefore, the protective film can be omitted in the construction of the loop antenna, thereby contributing to the reduction of manufacturing labor and manufacturing cost.

In addition, although the present invention has been described with one loop antenna pattern 11 as an example in the above-described first embodiment, it is also applicable to the case where two loop antenna patterns 11, 13 are formed on the same surface. This will be described with reference to FIGS. 4 to 6 attached as a second embodiment of the present invention.

Figure 4 is a flow chart showing a second embodiment in the method of manufacturing a loop antenna for NFC according to the present invention, Figure 5 is a flow chart showing a second embodiment in a method of manufacturing a loop antenna for NFC in accordance with the present invention step by step It is a cross section.

4 and 5, a second loop pattern forming step of forming a pattern 11 of a first loop antenna by laminating a copper foil 10 and a removable sheet 20 ( S201, the first loop terminal jump step (S202) and the copper foil (10) and the removable sheet (20) are laminated together after the terminal parts (111, 112) are jumped in the first loop antenna pattern (11). The second loop pattern forming step (S203) of forming a pattern of the second loop antenna, and removing the remove sheet 20 from the second loop antenna pattern 13 and the first loop antenna pattern 11 is The second loop pattern installation step (S204) of laminating the second loop antenna pattern 13 on the removed sheet 20, and the first loop antenna pattern 11 and the second loop antenna pattern 13 Ferrite sheet bonding step (S205) for adhering the ferrite sheet 30 to the upper surface, the remove sheet removal step (S206) for removing the remove sheet 20, and the adhesive liquid is applied to one surface It includes a release paper bonding step (S207) for bonding the release paper 42 to be.

The first loop pattern forming step (S201) may be performed by etching, printing, sputtering, or punching the copper foil 10 after laminating the copper foil 10 to the first remove sheet 20. 1 loop antenna pattern 11 is formed. In this case, the first loop antenna pattern 11 extends from the start end located inside and extends outward so that the end is located outside. In addition, a first terminal portion 111 and a second terminal portion 112 are formed at the start and end of the first loop antenna pattern 11, respectively.

The first loop terminal jump and plating step (S202) may be performed by insulating means 12 (for example, a portion of the first loop antenna pattern 11 contacted when the second terminal portion 112 is folded outwardly). After attaching the insulating tape, the second terminal part 112 is pulled outward so as to overlap the region where the insulating means 12 is located, and the plating is performed by using a conductive metal.

In the forming of the second loop pattern (S203), the second copper foil 10 'is laminated on the second remove sheet 20', and the second loop antenna pattern is formed by any one of etching, sputtering, punching, and printing. (13) to form. In this case, the second loop antenna pattern 13 and the first loop antenna pattern 11 respectively form a pattern after being laminated with the different remove sheets 20 and 20 ', respectively. That is, the first remove sheet 20 and the second remove sheet 20 'are separate from each other.

The second loop pattern installation step (S204) removes the second remove sheet 20 'on which the second loop antenna pattern 13 is laminated, and then removes the second loop antenna pattern 13 from the first remove. The step of laminating to the sheet 20. Here, an empty area is maintained in the center of the first remove sheet 20 on which the first loop antenna pattern 11 is laminated. Accordingly, the second loop antenna pattern 13 is laminated at the center of the first removable sheet 20 laminated on the first loop antenna pattern 11.

Here, the first loop antenna pattern 11 and the second loop antenna pattern 13 are formed to have the same thickness, and instead of the second loop antenna pattern 13, a patch antenna (not shown) Not applicable) is also applicable to any one of various applications of the present invention.

The ferrite sheet adhering step (S205) is a step of adhering the ferrite sheet 30 on the upper surfaces of the first loop antenna pattern 11 and the second loop antenna pattern 13.

The remove sheet removing step (S206) is a step of removing the first remove sheet 20 adhered to one surface of the first loop antenna pattern 11 and the second loop antenna pattern 13.

The release paper removing step S207 may include the release paper 42 having the adhesive layer 41 formed on one surface after the removal of the remove sheet S206, and the first loop antenna pattern 11 and the second loop antenna pattern 13. It is a step of bonding to one side.

As described above, the second embodiment of the present invention is a loop antenna pattern in the process of manufacturing the loop antenna for the NFC in which the first loop antenna pattern 11 and the second loop antenna pattern 13 (or patch-type copper foil 10) are formed. The protective film (eg, polyimide film, polycarbonate film), which is a conventional component, may be removed through the remove sheet 20, which may be removed after the formation and adhesion of the ferrite sheet 30.

In addition, in the configuration of the second embodiment described above, the distance between the first loop antenna pattern 11 and the distance between the first loop antenna pattern and the second loop antenna pattern 13 are adjusted to inductance values of the NF loop antenna. By adjusting the bandwidth and gain value could be adjusted. This will be described with reference to FIGS. 6 and 7A to 7C.

FIG. 6 is a view illustrating a loop antenna for an NFC in which a distance between the first loop antenna pattern 11 and the second loop antenna pattern 13 is adjusted in the configuration of the second embodiment of the present invention, and FIGS. 7A to 7C. Is a graph comparing with and without adjusting the distance between patterns.

Referring to FIG. 6, a spaced apart distance L1 (hereinafter referred to as a distance between loops L1) and a first loop antenna pattern 11 ′ between the first loop antenna pattern 11 and the second loop antenna pattern 13. , 11 "), is equal to the distance L2 (hereinafter referred to as the distance between patterns L2). Preferably the distance between loops (L1) is formed within 0.12 ~ 2.05mm, more preferably to maintain 0.3mm.

Here, the inter-loop distance L1 is a distance from the pattern 11 ′ positioned at the innermost side of the first loop antenna pattern 11 to the outermost pattern 13 of the second loop antenna pattern 13. .

In addition, in the present invention, the closed area in which the pattern 13 of the second loop antenna is formed is preferably 60 to 80% of the closed area in which the pattern 11 of the first loop antenna is formed.

Therefore, in the present invention, the mutual interference between the first loop antenna pattern 11 and the second loop antenna pattern 13 is maximized to maximize the gain and the extension of the frequency band. This will be explained using Figs. 7A to 7C.

7A to 7C are graphs for checking the change in gain according to the inter-pattern distance L2 of the NFC loop antenna according to the present invention, and FIG. 7A illustrates gain and frequency before and after resonance of an antenna having a single loop. FIG. 7B is a graph measuring the frequency bandwidth and the gain when the interval between the first loop antenna and the second loop antenna is greater than or equal to 3 mm, and FIG. 7C is the first loop antenna pattern 11 and the second loop. The inter-loop distance L1 of the antenna pattern 13 is disposed within 0.12 to 2.05 mm to measure the frequency bandwidth and the gain.

First, referring to FIG. 7A, the antenna to be measured is a single loop antenna, and the frequency bands and gains before (F2) and after (F1) of tuning the frequency are measured. As a result, the frequency (F2) of the single loop before tuning was 30 MHz, and the frequency (F1) after tuning was 13.56 MHz, and there were variations in the frequency and gain. However, the improved gain of such a single loop antenna is less effective than an antenna with two loops that are measured later.

Referring to FIG. 7B, a loop antenna to be measured is formed with a first loop antenna pattern 11 and a second loop antenna pattern 13, and the first loop antenna pattern 11 ′ and the second loop antenna are respectively formed. The inter-loop distance L1 of the pattern 13 was spaced at 3 mm or more to confirm the expansion of the bandwidth and the improvement of the gain. At this time, the frequency F3 of the inner second loop antenna pattern 13 is 14.15 MHz, and the frequency F4 of the outer first loop antenna pattern 11 is 12 to 13 MHz. In addition, the gain peak value of the combined frequency F5 corresponds to a center point of the portion where the frequency band of the second loop antenna and the frequency band of the first loop antenna overlap on the graph. In conclusion, when the distance between the loops L1 of the first loop antenna pattern 11 ′ and the second loop antenna pattern 13 of FIG. 7B is separated by 3 mm or more, gain improvement and bandwidth of the single loop are compared with those of the single loop. It shows higher efficiency at magnification.

Referring to FIG. 7C, the distance between the loops L1 of the second loop antenna inside the loop antenna to be measured and the first loop antenna outside and the patterns 11 ′ and 11 ″ of the first loop antenna. (L2) is arranged to be the same, but the distance between loops (L1) is set to 0.12 ~ 2.05mm or less, and most preferably set to 0.3mm.

In this case, the frequency of the second loop antenna is selected in the range of 15.5 to 17.5 MHz, and most preferably, 17 MHz. In addition, the frequency of the first loop antenna is selected within a range in which bandwidths do not overlap each other, as shown as being selected in a range of 20 MHz or more. More preferably, the first frequency F3 is selected to be 17 MHz and the second frequency is set to 20 MHz, and both the first frequency F3 and the second frequency F4 are 4 MHz or more at a resonance frequency. Match to fall.

As a result of improving the bandwidth and the gain by combining the frequencies of the first loop antenna and the second loop antenna, as shown in FIG. 7C, the gain value g1 when the inter-loop distance L1 is 3 mm or more is higher. It is confirmed that the gain value g2 can be obtained. In addition, compared to the graph of FIG. 7B, the expanded bandwidth of FIG. 7C may be visually confirmed that the width is expanded.

As described above, the present invention provides the second loop antenna 32 positioned at the outer loop distance L1 and the outer shell at the same thickness (that is, the height) of the first loop antenna pattern 11 and the second loop antenna pattern 13. The distance L2 between the patterns 11 'and 11' 'of the N1) or the distance L1 between the loops is set within 0.12 to 2.05 mm to increase the mutual interference between the first loop antenna and the second loop antenna. The gain value and the bandwidth can be greatly enlarged, and the advanced effect can be obtained as compared with the known technology.

In addition, in the present invention, the second loop antenna pattern 13 may be applied to a patch antenna (not shown) made of one copper foil. When the distance L1 between the patch antenna and the first loop antenna pattern 11 is set equal to the distance L2 between the first loop antenna pattern 11 'and the pattern 11' ', the above-described distance L1 is the same. As can be seen, efficiency of bandwidth expansion and gain increase can be obtained.

Although the present invention has been described in detail with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and variations belong to the appended claims.

10: copper foil 11: first loop antenna pattern
12 insulation means 13 second loop antenna pattern
20: remove sheet 30: ferrite sheet
40: double-sided tape 41: adhesive layer
42: release paper 111: first terminal portion
112: second terminal portion

Claims (8)

A limb lamination step of laminating the first copper foil on one surface of the first removable sheet to which the adhesive liquid is applied;
A first pattern forming step of forming a first loop antenna pattern using any one of etching, sputtering, punching, and printing processes of the first copper foil;
Bonding the insulating means to the insulating means in a region where terminal portions formed at the start and end portions of the first loop antenna pattern overlap with each other;
A terminal part jumping and plating step of attaching a terminal part formed at the end of the first loop antenna pattern to the insulating means after the insulating means bonding step and drawing it to the outside and plating with a conductive metal;
A ferrite sheet laminating step of adhering the ferrite sheet to the upper surface of the first loop antenna pattern after the jumping and plating of the terminal unit;
A remove sheet removing step of removing the remove sheet; And
And a release paper bonding step of bonding the release paper on the lower surface of the antenna pattern. The method of claim 1, wherein the NFC loop antenna manufacturing method
A second loop for forming the second loop antenna pattern by using any one of etching, sputtering, punching, and printing the second copper foil after laminating the second copper foil to one surface of the second removable sheet coated with the adhesive liquid Pattern forming step; And
And removing a second loop sheet by laminating the second loop antenna pattern on the first removable sheet by removing the second rib sheet. The method of claim 2, wherein the first loop antenna pattern and the second loop antenna pattern are formed to have the same thickness. The method of claim 2, wherein the first loop antenna pattern is
The end is formed on the outermost side by forming a loop at the start end located inside one surface of the first remove sheet, and the end is formed at the outermost side, and the end is bonded to the insulating means. Is formed to be drawn outwardly located,
And the second loop antenna pattern forms one or more loops starting from the center of the first remove sheet. The method of claim 2, wherein the first loop antenna pattern is
The end is formed on the outermost side by forming a loop at the start end located inside one surface of the first remove sheet, and the end is formed at the outermost side, and the end is bonded to the insulating means. Is formed to be drawn outwardly located,
And the second loop antenna pattern is a plate-shaped patch antenna bonded to the center of one surface of the first remove sheet. The inter-loop distance L1 according to any one of claims 2 to 5, which is a distance between the first loop antenna pattern and the second loop antenna pattern, is equal to the distance L2 between the first loop antenna patterns. Loop antenna manufacturing method for the NFC. The method of claim 6, wherein the inter-loop distance (L1) is
The loop antenna manufacturing method of the NFC is formed within 0.12 ~ 2.05mm as the distance from the innermost pattern of the first loop antenna pattern to the outermost pattern of the second loop antenna. The method of claim 7, wherein the second loop antenna pattern
A loop antenna manufacturing method for NFC, which comprises a closed area corresponding to 60 to 80% in proportion to the closed area of the first loop antenna pattern.

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