KR101775502B1 - A subminiature nfc antenna for mobile phone - Google Patents

Abstract

The present invention relates to a miniature NFC antenna for a wireless communication terminal, and a miniature NFC antenna for a wireless communication terminal according to the present invention includes a ferrite sheet (110), a dam (240) protruding along the edge of the ferrite sheet And a loop pattern 130 inserted into the insert concave portion Sa inside the dam. According to this structure, it is possible to miniaturize the size and improve the performance.

Description

TECHNICAL FIELD [0001] The present invention relates to an ultra-small NFC antenna for a wireless communication terminal,

Field of the Invention [0002] The present invention relates to an NFC (Near Field Communication) antenna, and more particularly, to a miniature NFC antenna for a wireless communication terminal that can be reduced to 50% or less of a conventional size and can be improved in performance.

2. Description of the Related Art [0002] In recent years, wireless communication terminals have added various functions other than communication functions, which are inherent functions, and NFC functions that can be applied to a non-contact type traffic card, electronic payment, and identification are added.

Such NFC is a short-range wireless communication technology for data communication at a distance of about 10 centimeters (cm) or less, is low in power consumption, compatible with non-contact RFID technology and uses radio signals in the 13.56 MHz band, An antenna shall be provided.

For example, an NFC antenna provided to support an NFC communication system includes an NFC circuit portion that is an FPCB (Flexible Printed Circuit Board) that configures an NFC antenna so that it can be easily mounted inside a terminal, And the antenna pattern is constituted by a loop antenna along the rim of the FPCB.

1 (a) and 1 (b), the loop pattern 11 is formed of a ferrite material, and the ferrite material is a ferrite material. FIG. 1 is a plan view of a conventional NFC antenna for a wireless communication terminal. And Fig.

As shown in FIG. 1, an NFC antenna for a short distance communication applied to a wireless communication terminal is composed of a ferrite sheet 11, a loop pattern 12, and an NFC circuit portion 13 (usually implemented on an FPCB circuit board).

The NFC antenna generally has a size of about one-half to one-third of that of the wireless communication terminal.

However, the conventional NFC antenna for a wireless communication terminal has the following problems.

First, the NFC antenna is implemented to have a large area due to the limitation of performance. As the size of the NFC antenna for the wireless communication terminal is increased, there is a problem that the mounting position in the wireless communication terminal and the spatial restriction at the time of mounting occur .

In addition, since the size of the NFC antenna for the wireless communication terminal increases, a problem of interference with other antennas occurs.

Secondly, in the case of an NFC antenna for a wireless communication terminal according to the related art, a technique capable of minimizing the occurrence of eddy current has not been developed.

Literature 1. Patent Registration No. 10-1170045 (public announcement date: July 31, 2012) Document 2. Japanese Patent Application Laid-Open No. 10-2014-0109488 (Published on September 15, 2014)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the conventional technology, and it is an object of the present invention to provide a miniature NFC antenna for a wireless communication terminal,

First, by adopting the structure in which the loop pattern is inserted into the insert groove of the dam, that is, the structure in which the dam covers the loop pattern, the size can be reduced to 50% or less of the conventional NFC antenna on the basis of the same performance, The NFC antenna can be miniaturized to improve the mounting performance to the wireless communication terminal and the space occupied by the NFC antenna inside the wireless communication terminal is reduced so that the space utilization inside the wireless communication terminal can be increased,

Second, by making it possible to miniaturize the size, it is possible to secure price competitiveness due to reduction of material cost and ease of inventory management,

Third, by adopting a configuration in which a loop pattern is inserted into an insert groove of a dam, that is, a configuration in which a dam covers a loop pattern, it is possible to increase the gain by improving the cross- Thereby minimizing the loss of eddy currents and improving performance,

Fourth, it is possible to prevent interference with other antennas,

Fifth, by adopting the structure of the ferrite core, it is possible to increase the magnetic field intensity to improve the straightness and to make the working distance farther,

Sixth, since the loop pattern can be fitted to the insert groove of the dam, it is possible to quickly and easily attach the loop pattern to the ferrite sheet without adopting another bonding means (double-faced tape, adhesive or the like) The present invention is to provide a miniature NFC antenna for a wireless communication terminal, which is suitable for reducing assembly costs and improving assembling workability so as to reduce the cost of the product as a whole.

According to an aspect of the present invention, there is provided a miniature NFC antenna for a wireless communication terminal, the antenna comprising: a thin ferrite sheet; and an upper surface of the ferrite sheet, A dam formed to protrude upward from the upper surface of the ferrite sheet and to form an insert recess groove so as to insert the loop pattern therein; and a dam inserted in the insert recess, placed on the upper surface of the ferrite sheet, And a loop pattern to be used as a loop pattern.

The ultra miniature NFC antenna for a wireless communication terminal according to the present invention is characterized by further comprising a ferrite core protruding upward from the center of the upper surface of the ferrite sheet inside the dam.

The small NFC antenna for a wireless communication terminal according to the present invention is characterized in that the dam is formed at a height equal to or higher than the height of the loop pattern.

The miniature NFC antenna for a wireless communication terminal according to the present invention is characterized in that the dam is formed in a closed loop form.

Characterized in that the loop pattern is inserted and placed in the insert groove of the dam.

A method of manufacturing an ultra-small NFC antenna for a wireless communication terminal according to the present invention includes the steps of preparing a ferrite sheet preform having a thickness greater than that of a ferrite sheet, forming an insert recess groove by irradiating a laser beam inside the edge of the ferrite plate, Forming a ferrite sheet and forming a dam on an edge of the ferrite plate; and inserting a loop pattern into the insert groove to be mounted.

The present invention provides a method of manufacturing a miniature NFC antenna for a wireless communication terminal, the method comprising the steps of: preparing a ferrite sheet; forming a hollow hole in the ferrite sheet, Comprising the steps of: preparing an adapter ring having a size larger than that of the ferrite sheet; applying an adhesive to at least one of the upper surface of the ferrite sheet or the lower surface of the adapter ring; And cutting the adapter ring out of the ferrite sheet along the edge of the ferrite sheet.

The miniature NFC antenna for a wireless communication terminal according to the present invention having the above-described configuration has the following effects.

First, by adopting the configuration in which the loop pattern is inserted into the insert groove of the dam, that is, the structure in which the dam covers the loop pattern, the size can be reduced to 50% or less as compared with the conventional one. As a result, It is possible to improve the mounting performance to the terminal and to reduce the space occupied by the NFC antenna inside the wireless communication terminal, thereby increasing the space utilization inside the wireless communication terminal.

Secondly, by making the size small, it is possible to secure price competitiveness due to reduction of material cost and ease of inventory management.

Third, by adopting a configuration in which a loop pattern is inserted in an insert groove of a dam, that is, a configuration in which a dam covers a loop pattern, the cross-directional nature of the NFC antenna can be improved to increase gain, Thereby reducing the loss of the eddy current and improving the performance.

Fourth, there is an effect of preventing interference with other antennas.

Fifth, by adopting the structure of the ferrite core, the strength of the magnetic field is further increased to improve the linearity, and as a result, the operation distance can be further increased.

Sixth, since the loop pattern can be fitted to the insert groove of the dam, it is possible to quickly and easily attach the loop pattern to the ferrite sheet without adopting another bonding means (double-faced tape, adhesive or the like) As a result, it is possible to reduce assembly costs and improve assembling workability, thereby reducing the overall cost of the product.

1 is a conceptual diagram of a conventional NFC antenna for a wireless communication terminal according to the prior art. FIG. 1 (a) is a plan view and FIG. 1 (b) is a side view of a side view in which a loop pattern is attached to a ferrite sheet.
2 is a plan view of a module configuration of a ferrite sheet 100 in which a dam 120 is formed in a miniature NFC antenna for a wireless communication terminal according to an embodiment of the present invention.
Figure 3 is a cross-sectional view of Figure 2;
Fig. 4 is a plan view of the insert groove Sa of Fig. 2 with the insert pattern of the loop pattern 130 inserted therein.
Figure 5 is a cross-sectional view of Figure 4;
FIG. 6 is a plan view of a main part of a miniature NFC antenna for a wireless communication terminal according to another embodiment of the present invention.
Figure 7 is a cross-sectional view of Figure 6;
8 is a process diagram of a method for fabricating a miniature NFC antenna for a wireless communication terminal according to an embodiment of the present invention.
9 is a process diagram of a method for fabricating a miniature NFC antenna for a wireless communication terminal according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a miniature NFC antenna for a wireless communication terminal according to the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 2 is a plan view of a module configuration of a ferrite sheet 100 in which a dam 120 is formed in a miniature NFC antenna for a wireless communication terminal according to an embodiment of the present invention. FIG. 3 is a cross- And FIG. 4 is a plan view of the insert recess Sa of FIG. 2 with the insert of the loop pattern 130 inserted therein. FIG. 5 is a cross-sectional view of FIG.

2 to 5, a miniature NFC antenna for a wireless communication terminal according to an exemplary embodiment of the present invention includes a thin plate-like ferrite sheet (Ferrite The ferrite sheet 100 includes a ferrite sheet 100 and a ferrite sheet 100. The ferrite sheet 100 has a top surface 110a and a top surface 110a of the ferrite sheet 100, A dam 120 forming an insert groove S so that the pattern 130 is inserted thereinto and a dam 120 inserted into the insert groove Sa and placed on the upper surface 100a of the ferrite sheet 100 And a loop pattern 130 connected to an NFC circuit part (specifically, one end and the other end of the loop pattern part 121 are connected to the NFC circuit part).

The NFC circuit unit is connected to an NFC connection terminal (not shown) of the main PCB (not shown) of the wireless communication terminal.

As described above, by the structure in which the loop pattern 130 is inserted into the insert concave groove Sa of the dam 120, that is, the structure in which the dam 120 covers the loop pattern 130, the NFC The antenna size can be reduced to less than 50% of the conventional size.

The reason why the size of the loop pattern 130 can be reduced in this way is that when the outer periphery of the loop pattern is shielded by the dam 120, the loss of the current flowing to the outside of the loop pattern 130 is reduced and the performance is improved. .

Since the size of the NFC antenna can be reduced as described above, it is possible to miniaturize the NFC antenna, thereby improving the mounting of the NFC antenna in the wireless communication terminal and reducing the occupancy space of the NFC antenna inside the wireless communication terminal. There is an advantage to increase.

For example, as a standard for achieving the same performance, it was conventionally about 40 mm * 50 mm, but it can be downsized to 20 mm * 20 mm.

The applicant of the present invention has tested the NFC antenna having the conventional size of 33 * 35 and the present invention having the size of 19 * 29 to which the technique of the present invention is applied, and the results are summarized in Table 1 below.

Terminal Tag

Vivo Pay
Type B
DES Fire
Reference working distance

25 mm or more
5 mm or more
15 mm or more Conventional technology
(33 * 35 mm)

58 mm
14 mm
23 mm Invention of the present invention
(19 * 29)

85 mm
35 mm
50 mm

In Table 1, it can be seen that the operation performance (motion detection distance) is improved even though the size is reduced by 30% or more.

As the size becomes smaller, there is an advantage that price competitiveness can be ensured due to reduction of material cost and ease of inventory management.

As described above, the loop pattern 130 is inserted into the insert concave groove Sa of the dam 120, that is, by the structure in which the dam 120 covers the loop pattern 130, the nature of the NFC antenna There is an advantage in that the gain can be increased by improving the cross sectional directivity of the loop pattern 130 and the loss of the eddy current induced in the loop pattern 130 can be minimized to improve the performance.

In addition, there is an advantage that the interference phenomenon with other antennas can be blocked.

In addition, in the miniature NFC antenna for a wireless communication terminal according to an embodiment of the present invention, the dam 120 may be integrally formed with the ferrite sheet 110, but may be attached with an adhesive or an adhesive tape.

FIG. 6 is a plan view of a main portion of a miniature NFC antenna for a wireless communication terminal according to another embodiment of the present invention, and FIG. 7 is a cross-sectional view of FIG.

6 and 7, the microminiature NFC antenna for a wireless communication terminal according to another embodiment of the present invention includes an upper surface 100a of the ferrite sheet 100 inside the dam 120, And a ferrite core (150) protruding from the ferrite core (150).

According to this, there is an advantage that the intensity of the magnetic field can be made larger, the straightness can be improved, and the working distance can be further increased.

The dam 120 may have a height equal to or higher than the height of the loop pattern 130.

The dam 120 is formed in a closed loop shape.

The loop pattern 130 is inserted into the insert groove Sa of the dam 120 and is placed thereon.

According to this structure, there is an advantage that it is possible to quickly and easily mount the loop pattern 130 on the ferrite sheet 100 without employing another bonding means (double-faced tape, adhesive, etc.) It is possible to reduce the airflow and improve the assembly workability, thereby reducing the cost of the product as a whole.

A method of fabricating a miniature NFC antenna for a wireless communication terminal according to an embodiment of the present invention will now be described.

8 is a process diagram of a method for fabricating a miniature NFC antenna for a wireless communication terminal according to an embodiment of the present invention.

First, a ferrite sheet preform 110 'having a thickness (for example, 80 .mu.m) thicker than the ferrite sheet 100 is prepared (FIG. 8 (a)).

A ferrite sheet 100 is formed on the upper surface of the ferrite sheet parent material 100 'by irradiating a laser beam to the inner side of the edge of the ferrite sheet parent material 100' to form insert grooves Sa having a depth of, for example, At the same time, the dam 120 is formed on the edge of the ferrite sheet parent material 100 '(Fig. 8 (b)).

Then, the loop pattern 130 is inserted into the insert groove Sa and placed thereon (Fig. 8 (b)).

Needless to say, the loop pattern 130 must be connected to the NFC circuit (FPCB circuit board), which is the same as in the prior art.

Wherein the laser beam is irradiated while measuring the depth of processing to be etched.

The laser may be processed, for example, using an IR, UV source, or the like.

FIG. 9 is a process diagram of a method of manufacturing a miniature NFC antenna for a wireless communication terminal according to another embodiment of the present invention.

First, a ferrite sheet 100 is prepared (Fig. 9 (a)).

9 (a-1) is a plan view and FIG. 9 (a-2) is a cross-sectional view of (a-1).

The width (w2) and the height (h2) of the hollow hole 210a formed in the inside (the square is the width w2 and the height h2 and the radius is the radius) (the width w3 and the height h3 in the case of a quadrangle and the radius in the case of a circle) are smaller than the size of the ferrite sheet 100 (circular ring or square ring) larger than the radius [w1] and the height h1, and in the case of the circular shape, the radius] (Fig. 9 (b)).

9 (b-1) is a plan view and FIG. 9 (b-2) is a cross-sectional view of (b-1).

Adhesives g1 and g2 are applied to at least one of the upper surface of the ferrite sheet 100 or the lower surface of the adapter ring 210 (Fig. 9 (c)).

Instead of the adhesives g1 and g2, an adhesive tape may be equivalently substituted.

Next, the ferrite sheet 100 and the adapter ring 210 are joined together to adhere the lower surface of the adapter ring 210 to the upper surface of the ferrite sheet 100 (Fig. 9 (d)).

9 (d-1) is a plan view and FIG. 9 (d-2) is a cross-sectional view of (d-1).

Finally, the adapter ring 210 deviating from the ferrite sheet 100 is cut along the edge of the ferrite sheet 100 (Fig. 9 (e)).

9 (e-1) is a plan view and Fig. 9 (e-2) is a cross-sectional view of (e-1).

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is self-evident to those who have.

Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

110: ferrite sheet 110a: upper surface of ferrite sheet
120: Dam Sa: Insertion groove
130: Loop pattern 150: Ferrite core
110 ': ferrite sheet base material 210: adapter ring
210a: hollow hole of adapter ring

Claims (4)

1. An NFC antenna for a short distance communication provided in a wireless communication terminal,
A thin ferrite sheet 110,
The ferrite sheet 110 is formed by projecting upwardly from the upper surface 110a of the ferrite sheet 110 along the edge of the upper surface 110a of the ferrite sheet 110 and having insert insert recesses Sa , A dam (120) forming a dam (120)
A loop pattern 130 inserted in the insert groove Sa and mounted on the upper surface 110a of the ferrite sheet 110 and connected to the NFC circuit portion,
And a ferrite core 150 protruding upward from a center of an upper surface 110a of the ferrite sheet 110 inside the dam 120,
The dam 120 is formed integrally with the ferrite sheet 110,
The dam 120 may have a height equal to or higher than the height of the loop pattern 130,
The dam 120 is formed in a closed loop shape,
Wherein the loop pattern (130) is inserted and placed in the insert groove (Sa) of the dam (120). delete delete delete

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