KR20160100786A - Shielding unit for combo antenna and wireless charging module having the same - Google Patents

Abstract

Provided are a shielding unit for a combo antenna and a wireless power charging module having the same. The shielding unit for a combo antenna according to an exemplary embodiment of the present invention comprises: a first sheet which improves the characteristics of a wireless charging antenna; and a second sheet which improves the characteristics of a local area antenna and includes a receiving unit for receiving a partial thickness or entire thickness of the first sheet, wherein the first sheet is separated by a plurality of minute pieces after the ribbon sheet of amorphous alloy or nano-crystal grain alloy is processed by flakes and is arranged in the receiving unit. According to this, if a shielding unit is composed of a plurality of sheets in order to improve each of the characteristics of a plurality of antennas performing each different roles, one sheet is inserted and arranged in different sheets, and thus slimming can be realized by reducing the entire thickness, and the characteristic change can be reduced by securing the flexibility of a sheet itself.

Description

Technical Field [0001] The present invention relates to a shielding unit for a combo antenna and a wireless power charging module including the shielding unit.

The present invention relates to wireless charging, and more particularly, to a shielding unit for a combo antenna and a wireless power charging module including the shielding unit, which can reduce the overall thickness while improving all characteristics of the antenna.

Recently, various functions such as RFID (Radio Frequency Identification), short range wireless communication (NFC), wireless charging (WPT) and interactive pen tablet have been added to portable terminals including mobile phones and tablet PCs.

NFC is a non-contact type short-range wireless communication module that uses 13.56MHz frequency band as one of RFID tags, and it is a technology to transmit data between terminals at a distance of 10cm. NFC is widely used not only for mobile payments, but also for transferring travel information, transportation, and access control locks for goods information and visitors in supermarkets and general shops, as well as for file transfer.

In addition, recently announced by Google, 'Android Beam' included in the smart phone is a near-field wireless communication (NFC) -based short distance information transmission and reception function that not only allows mobile payment but also photo, business card, file, map, To other phones.

Meanwhile, the portable terminal has a wireless charging function for wirelessly charging a built-in battery. The wireless charging includes a wireless power receiving module built in the portable terminal, a wireless power transmitting module for supplying power to the wireless power receiving module, Module.

In addition, the wireless charging may be classified into a magnetic induction type and a self-resonance type, and may be classified into a PMA type and a Qi type depending on a method of detecting a wireless power receiving module accessing the wireless power transmitting module.

In recent years, the thickness of the wireless power receiving module built in the portable terminal has been reduced as the size of the wireless terminal has become smaller and smaller. For example, the total thickness of the wireless power receiving module has to be designed to 0.6m or less, or even 0.3mm or less Faced.

When the thickness of the wireless power receiving module is designed to be 0.6 mm or less, or even 0.3 mm or less, it is difficult to realize the characteristics required for the wireless charging method.

That is, when the antenna unit is provided with a plurality of antennas serving different roles, it is general to construct a shielding unit by stacking a plurality of sheets in order to improve characteristics of the antenna. Accordingly, since the shielding unit is constructed by stacking a plurality of sheets, there is a limit in reducing the overall thickness of the shielding unit.

Accordingly, there is an urgent need to develop a shielding unit capable of satisfying the requirements required for wireless charging while meeting the demand for compact size and compactness of the portable terminal.

KR 10-2013-0045306 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a shielding unit in which, when a plurality of sheets are formed in order to improve the characteristics of a plurality of antennas, And it is an object of the present invention to provide a shielding unit for a combo antenna which can reduce the overall thickness.

Further, according to the present invention, it is possible to constitute a sheet such that a sheet disposed outside the plurality of sheets constituting the shielding unit has a curved shape of at least one side including a predetermined ratio or more, Another object is to provide a shielding unit for a combo antenna.

It is another object of the present invention to provide a wireless power charging module capable of reducing the total thickness while satisfying the charging characteristics required in the wireless charging system by providing the shielding unit.

In order to solve the above-mentioned problems, the present invention provides a wireless communication device, comprising: a first sheet for improving characteristics of a wireless charging antenna; And a second sheet provided with a receiving portion for improving the characteristics of the antenna for short-range communication and accommodating a thickness of the first sheet or a total thickness of the first sheet, wherein the first sheet is flaked and divided into a plurality of micro- The present invention provides a shielding unit for a combo antenna comprising a ferrite sheet formed of a ribbon sheet of an amorphous alloy or a nano-crystal alloy and disposed in the receiving portion, and the second sheet is flaked and divided into a plurality of fine pieces.

In addition, the first sheet may include protrusions protruding from the one surface of the second sheet to the outside to a certain thickness.

The protruding portion may include a first portion disposed in a region corresponding to the receiving portion and a second portion extending from the first portion, and the second portion may have a first surface and a second surface, have. At this time, the second portion may be entirely or partially provided along the rim of the first portion.

The receiving portion may be formed as a receiving groove recessed from a surface of the second sheet to a predetermined depth or may be formed as a through hole penetrating the second sheet, and the first sheet may be inserted into the receiving portion to reduce the overall thickness.

The ferrite sheet may be made of Mn-Zn ferrite or Ni-Zn ferrite.

In a preferred embodiment of the present invention, the plurality of micro pieces may be irregular, and the plurality of micro pieces may be entirely insulated or partially insulated among neighboring micro pieces, and at least one side may be a curved shape And the like. At this time, the number of fine pieces having at least one curved shape among the total number of the plurality of fine pieces may be 50% or more, preferably 70% or more.

The average particle diameter of the fine particles constituting the second sheet may be formed to be larger than the average particle diameter of the minute particles constituting the first sheet. The average particle diameter of the fine particles constituting the second sheet May be 1.2 to 2 times larger than the average particle diameter of the fine particles constituting the first sheet.

In addition, the wireless recharging antenna may be disposed in a region corresponding to one surface of the first sheet, and the short-range communication antenna may be disposed in a region corresponding to one surface of the second sheet, The sheet may be provided to have different permeability.

The first sheet may be formed by stacking a plurality of layers of a ribbon sheet of an amorphous alloy or a nano-crystal alloy.

According to another aspect of the present invention, there is provided an antenna unit comprising: a combinable antenna unit including a wireless charging antenna and a short-range communication antenna; And a shielding unit disposed on one surface of the antenna unit to induce a magnetic field, the shielding unit comprising: a first sheet for improving characteristics of a wireless charging antenna; And a second sheet provided with a receiving portion for improving the characteristics of the antenna for short-range communication and accommodating a thickness of the first sheet or a total thickness of the first sheet, wherein the first sheet is flaked and divided into a plurality of micro- The present invention provides a wireless power charging module comprising a ferrite sheet formed of a ribbon sheet of an amorphous alloy or a nano-crystal alloy and disposed in the receiving portion, the second sheet being flaked and divided into a plurality of fine pieces.

According to the present invention, when the shielding unit is composed of a plurality of sheets in order to improve the characteristics of a plurality of antennas that play different roles, one sheet can be inserted into another sheet, thereby reducing the overall thickness and realizing thinning .

Further, according to the present invention, the sheet disposed outside the plurality of sheets constituting the shielding unit is configured to include at least a predetermined number of minute pieces each having a curved shape, thereby securing the flexibility of the sheet itself, have.

1 is a cross-sectional view illustrating a shielding unit for a combo antenna according to an embodiment of the present invention,
Fig. 2 is a sectional view showing another form of the accommodating portion in Fig. 1,
Fig. 3 is an enlarged view showing a detailed configuration of the first sheet and the second sheet in Fig. 1,
4 is a schematic view showing various forms of protrusions when a protrusion is provided on a first sheet in a shielding unit for a combo antenna according to an embodiment of the present invention;
5 is a view schematically showing the shape of a microstructure when a first sheet and a second sheet are separately formed into a plurality of microstructures in a shielding unit for a combo antenna according to an embodiment of the present invention,
6 is a diagram illustrating a wireless power charging module to which a shielding unit for a combo antenna according to an embodiment of the present invention is applied,
Fig. 7 is a sectional view of Fig. 6. Fig.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

6 and 7, the wireless power charging module 100 includes an antenna unit 110 and a shielding unit 120 according to an embodiment of the present invention.

The antenna unit 110 is for transmitting or receiving a radio signal with a portable electronic device such as a cellular phone, a PDA, a PMP, a tablet, a multimedia device, and the like.

The antenna unit 110 includes a plurality of antennas 114a and 114c operating at different operating frequencies and is provided in a combo type having different roles.

That is, the plurality of antennas include a wireless charging antenna 114a for transmitting and receiving a wireless signal at a corresponding operating frequency to transmit power for wireless charging, and a short-range communication antenna 114c for transmitting and receiving near data do.

Here, the wireless charging antenna 114a may serve as a receiving antenna for transmitting power using an inductive coupling scheme based on electromagnetic induction through a wireless power signal transmitted or received, and may serve as a transmitting antenna .

The plurality of antennas 114a and 114c may be formed of a flat coil of circular, elliptical or quadrangular shape in which a conductive member having a predetermined length is wound a plurality of times in a clockwise or counterclockwise direction, or a metal foil such as a copper foil Or may be formed by etching.

At this time, the conductive member may be made of a conductive metal such as copper, and may have a plurality of strands having predetermined diameters twisted along the longitudinal direction.

The plurality of antennas 114a and 114c may be formed by patterning a conductor such as a copper foil on at least one surface of a circuit board made of a synthetic resin such as polyimide (PI) or PET in the form of a loop, May be formed. Although the plurality of antennas 114a and 114c are illustrated as being patterned on the upper surface of the circuit board, the present invention is not limited thereto. The antenna may be patterned on the lower surface of the circuit board, .

In addition, the plurality of antennas 114a and 114c may be provided in a form in which antenna patterns patterned on at least one surface of a circuit board and a plate-like coil in which a conductive member is wound a plurality of times are combined with each other.

The antenna unit 110 is fixed to one surface of the shielding unit 120 through an adhesive layer. Here, the adhesive layer may be a bond having adhesive properties, PVC, rubber, double-sided tape or the like, and may include a conductive component.

On the other hand, when the near-field communication antenna 114c and the wireless charging antenna 114a are patterned on the circuit board 112, since the short-range communication antenna 114c has a higher operating frequency band than the wireless charging antenna 114a Since the wireless charging antenna 114a is required to transmit electric power and uses a lower frequency band than the antenna 114c for short-range communication, the antenna for short-range communication 114a is formed in a rectangular shape with a small line width along the outer periphery of the circuit board 112, Can be formed with a line width that is wider than the line width of the antenna for short range communication 114c on the inner side of the antenna 114c.

In addition, the antenna unit 110 may further include an MST (Magnetic Secure Transmission) antenna 114b capable of performing settlement between the short-range communication antenna 114c and the wireless charging antenna 114a have.

The shielding unit 120 is formed of a plate-shaped member having a predetermined area, and functions to collect the magnetic field generated by the antenna unit 110 and focus it in a desired direction.

The shielding unit 120 may include a first sheet 121 and a second sheet 121 which are different from each other so as to increase the characteristics of the antennas corresponding to the plurality of antennas 114a and 114c, 122).

That is, the first sheet 121 is for improving the characteristics of the wireless antenna 114a among the plurality of antennas 114a and 114c, and the second sheet 122 is for improving the characteristics of the antenna 114c for short- To improve the characteristics.

To this end, the first sheet 121 is disposed in an area corresponding to the wireless charging antenna 114a, and the second sheet 122 is disposed in an area corresponding to the antenna for short-range communication 114c .

At this time, the first sheet 121 is provided to have a size including a region for wireless charging antenna 114a disposed inside the short-range communication antenna 114c. Thus, the entire area of the wireless charging antenna 114a is covered with the first sheet 121, thereby effectively improving the characteristics of the wireless charging antenna.

In addition, the first sheet 121 is provided so as not to exceed the inner area of the antenna for short range communication 114c so as not to deteriorate the characteristics of the antenna for short range communication 114c. That is, the first sheet 121 includes an inner area of the antenna 110c for short-range communication, and has an appropriate area not including the area directly above the antenna for short-range communication 114c.

Here, it is noted that the first sheet 121 may or may not include an area immediately above the MST antenna 114b when the antenna unit 110 is provided with the MST antenna 114b .

Although not shown in the drawing, the short-range communication antenna 114c is disposed inside the wireless-re- cording antenna 114a, and the receiving portions 124 and 124 ' It is noted that the second sheet 122 formed on the seat 121 and improving the characteristics of the antenna for short range communication 114c may be inserted into the receiving portions 124 and 124 '.

At this time, the first sheet 121 and the second sheet 122 may have different permeabilities in a predetermined frequency band. That is, the first sheet 121 may be made of a material having a relatively higher permeability than the second sheet 122 in a band of 100 to 350 kHz. For example, the first sheet 121 may be a ribbon sheet of an amorphous + alloy or a nanocrystalline alloy having a permeability of 600 to 950 at 100 kHz, and the second sheet 122 may be a sheet of 250 - A ferrite sheet having a permeability of 750 can be used.

When the first sheet 121 is formed of a ribbon sheet of an amorphous alloy or a nano-crystal alloy, a ribbon sheet 121c of a plurality of amorphous alloys or nanocrystalline alloys is stacked as shown in FIG. 3 .

Here, the amorphous alloy or the nanocrystalline alloy may be an Fe-based or a Co-based magnetic alloy. In addition, the ferrite sheet may be composed of a sintered ferrite sheet, and the ferrite may be Mn-Zn ferrite or Ni-Zn ferrite.

In addition, it should be noted that the first sheet 121 and the second sheet 122 are not limited to the above-mentioned types, and any material having magnetic properties can be used.

Meanwhile, the shielding unit 120 according to an embodiment of the present invention can improve the characteristics of each antenna that plays a different role and reduce the overall thickness of the shielding unit.

To this end, accommodating portions 124 and 124 'for accommodating a part of the thickness or total thickness of the first sheet 121 are provided inside the second sheet 122, and the accommodating portions 124 and 124' 1 sheet 121 is inserted and disposed, the entire thickness of the shielding unit can be reduced.

As shown in FIG. 2, the receiving portion may be provided in the form of a receiving groove 124 'that is formed at a predetermined depth inward from one surface of the second sheet 122, And may be provided in the form of a through hole 124 passing through the two sheets 122.

Here, the receiving groove 124 'and the through hole 124 are formed to have an area corresponding to one surface of the first sheet 121.

The first sheet 121 is inserted into the receiving portions 124 and 124 'so that the thickness of the first sheet 121 is partially or entirely received by the receiving portions 124 and 124' Has a relatively thin thickness as compared with the case where the first sheet 121 and the second sheet 122 are laminated.

Accordingly, at least a part of the thickness of the first sheet 121 inserted into the receiving portions 124 and 124 'is omitted because it is included in the thickness of the second sheet 122, The total thickness of the wireless power charging module 100 can be reduced as well.

Therefore, even if the entire thickness of the wireless power charging module 100 is designed to be 0.6 mm or less, or even 0.3 mm or less, the characteristics required in the wireless charging system can be satisfied. Here, the total thickness of the wireless power charging module 100 is 0.6 mm. However, it should be understood that the wireless power charging module 100 is of a very thin thickness.

In addition, a separate adhesive layer 123 is disposed on at least one of the upper and lower surfaces of the shielding unit 120, and a separate protective film 125 is provided on one surface of the adhesive layer 123, It is possible to prevent the first sheet 121 inserted into the through hole from deviating to the outside. Preferably, the adhesive layer 123 and the protective film 125 may be provided on the upper surface and the lower surface of the shielding unit 120, respectively.

Here, the adhesive layer 123 may be made of a non-conductive material. When the first sheet 121 and the second sheet 122 are flaked and separated into fine pieces, they are absorbed between the fine pieces, It may also play a role of insulation. In addition, the adhesive layer 123 may be provided as an adhesive or in the form of a film-like substrate and a protective film coated with an adhesive on one or both sides of the substrate.

At this time, the first sheet 121 inserted into the receiving portions 124 and 124 'may be provided so as to form a horizontal plane on the same plane as the one surface of the second sheet 122, 121b protruding outside at a predetermined height, and may be formed to be stepped with respect to one surface of the second sheet 122.

The protrusions 121a and 121b may include a first portion 121a disposed in a region corresponding to the accommodating portion 124 or 124 'and a second portion 121b extending outwardly from the first portion 121a. . Here, the second portion 121b may be entirely or partially provided along the rim of the first portion 121a (see FIG. 4), and the first sheet 121 may be provided in the receiving portions 124 and 124 ' And one surface of the second portion 121b may be disposed to be in contact with one surface of the second sheet 122.

Accordingly, the first sheet 121 may have a stepped structure partially or entirely through the second portion 121b extending from the first portion 121a, so that when the first sheet 121 is inserted into the receiving portion 124 or 124 ' The depth to be inserted by the second portion 121b is limited.

Accordingly, when the first sheet 121 and the second sheet 122 are coupled, the insertion depth is limited by the second portion 121b, thereby facilitating the coupling. In addition, the second portion 121b and the second portion 121b An adhesive layer (not shown) is disposed on the contact surface of the sheet 122 so that one surface of the second portion 121b is fixed to one surface of the second sheet 122 so that the first sheet 121 and the second sheet 122 ) Can be increased.

At least one of the first sheet 121 and the second sheet 122 constituting the shielding unit 120 or 120 'may be flaked and separated into a plurality of micro-pieces. Preferably, as shown in FIG. 3, both the first sheet 121 and the second sheet 122 may be flaked and separated into a plurality of micro-pieces.

At this time, the plurality of microparts may be entirely insulated or partially insulated from neighboring microparts, and may have a size of 1 to 7 mm, and each of the pieces may be irregularly randomized .

This is because the first sheet 121 and the second sheet 122 are separated into a plurality of minute pieces so that the first sheet 121 and the second sheet 122 are prevented from being broken during the course of use or transportation, Or deterioration of characteristics which may occur during the separation, as well as to increase the overall resistance and suppress the occurrence of eddy currents. As a result, it is possible to prevent a change in the initial characteristic value due to cracking and breakage of the sheet, and to increase the Q (quality factor) value at each antenna through increase of the resistance value, thereby improving the overall efficiency.

When the first sheet 121 and the second sheet 122 are flaked to form a fine piece and a plurality of sheets separated into fine pieces are laminated, the sheet is formed of a nonconductive material The adhesive layer 121d may be disposed. The adhesive layer 121d may function to insulate a plurality of microparts constituting each sheet by being seeped into the respective sheet side to be laminated to each other and disposed between the microparticles. Here, the adhesive layer may be formed of an adhesive or may be provided on one side or both sides of a substrate in the form of a film with an adhesive applied thereto.

At this time, when the first sheet 121 and the second sheet 122 are flaked to be divided into a plurality of pieces, they may include micro-pieces having at least one curved shape rather than a straight line (see FIG. 5) . That is, the total number of the micro-pieces in which at least one of the total number of the micro-pieces constituting each sheet is curved may be a ratio of 50% or more of the total number, and preferably 70% or more.

This is to make it possible to improve the flexibility of the sheet itself by constructing a sheet made of fine pieces, the minute pieces comprising a curved shape, at least one side of which is not a straight line, at a predetermined ratio.

Accordingly, even if the first sheet 121 and the second sheet 122 constituting the shielding unit are bent or bent by an external force during the use process or the conveying process, the flexibility of the sheet itself is improved, Or a crack can be prevented from occurring in advance. Thus, the initial design value of the sheet itself can always be maintained.

On the other hand, the results of testing the flexibility according to the ratio of the minute pieces having at least one curved shape to the total number of all the minute pieces constituting the sheet are shown in Table 1 below.

That is, when the sheet is bent 100 times at an angle of 30 degrees with respect to the horizontal plane, the average number of protruded fine pieces pressed by the protective film 125 is 10 or more, and less than 10 are classified as acceptable products.

The average number of fine pieces protruding by pressing the protective film when the sheet is bent 100 times at a 30 degree angle with respect to the horizontal plane Curvature Shape Microstructure Ratio 30% 50% 70% Average number of fine pieces 20 9 3 Bad X O O

As can be seen from Table 1 above, when the ratio of the minute pieces having at least one curved shape to the total number of all the minute pieces constituting the sheet is less than 50%, the total number of the minute pieces protruding toward the protective film side is 10 , And it was confirmed that the total number of fine protrusions protruding to the protective film side was less than 10 when the thickness was 50% or more.

In other words, when the sheet is bent 100 times at an angle of 30 degrees with respect to the horizontal plane, the average number of the minute pieces to be pressed on the protective film is small, the flexibility of the sheet itself is improved and the possibility of breakage of the minute pieces by bending or bending is low , Meaning that the change in the initial characteristic value of the sheet itself is insignificant.

Particularly, in the case of the second sheet 122 arranged to surround the first sheet 121, a relatively large amount of warping or bending due to an external force is generated as compared with the first sheet 121, It is preferable that the ratio of the minute pieces composed of at least one curved shape to the total number of all the minute pieces constituting the sheet is 70% or more.

When the first sheet 121 and the second sheet 122 are flaked and separated into fine pieces, the average particle size of the fine pieces constituting the second sheet 122 is greater than the average diameter of the first sheet 121, The size of the microparticles may be larger than the average particle size of the microparticles. Preferably, the average particle diameter of the minute particles constituting the second sheet 122 is 1.2 to 2 times larger than the average particle diameter of the minute particles constituting the first sheet 121. For example, the average particle size of the minute pieces constituting the first sheet 121 may be 1 to 4 mm, and the average particle size of the minute pieces constituting the second sheet 122 may be 4 to 6 mm.

Here, the average particle diameter refers to a volume average diameter measured by a laser diffraction particle size distribution meter.

For example, when the first sheet 121 is composed of a ribbon sheet of an amorphous alloy or a nanocrystalline alloy and the second sheet 122 is composed of a ferrite sheet, the ferrite pieces constituting the second sheet 122 May be provided so as to have a size larger than an average particle size of the ribbon pieces constituting the first sheet 121.

This is because, if the size of the ferrite pieces becomes too large, for example, if the size of the ferrite pieces is twice or more than the average grain size of the ribbon pieces constituting the first sheet 121, If the average grain size of the ferrite pieces is 1.2 times or less than the average grain size of the ribbon pieces constituting the ferrite pieces 121, the magnetic path is blocked by the clearance between the ferrite pieces, so that the function of the ferrite can not be sufficiently exhibited. This is because the reception sensitivity of the antenna for short range communication 114c is lowered.

It is noted that the shielding unit 120 for a combo antenna according to an embodiment of the present invention and the wireless power charging module 100 including the shielding unit 120 may be applied to a Qi scheme or a PMA wireless scheme. In addition, when the wireless power charging module 100 is used as a receiving module, the wireless power charging module 100 may be attached to a back cover of an electronic device such as a portable terminal.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: wireless power charging module 110: antenna unit
112: circuit board 114a: antenna for short range communication
114b: Antenna for MST 114c: Wireless charging antenna
120, 120 ': shielding unit 121: first sheet
121a: first part 121b: second part
121c: ribbon sheet of amorphous alloy or nano-crystal alloy
121d: adhesive layer 122: second sheet
123: adhesive layer 124:
124 ': receiving groove 125: protective film

Claims (32)

A first sheet for improving characteristics of a wireless rechargeable antenna; And
And a second sheet having a receiving portion for improving the characteristics of the antenna for short-range communication and accommodating a part of the first sheet or an entire thickness of the first sheet,
Wherein the first sheet is formed of a ribbon sheet of an amorphous alloy or a nano-crystal alloy alloy which is flaked and divided into a plurality of micro-pieces and disposed in the receiving portion, and the second sheet is flaked to form a plurality of micro- Shielding unit for a combo antenna. The method according to claim 1,
Wherein the first sheet includes protrusions protruding outwardly from one surface of the second sheet to a predetermined thickness. 3. The method of claim 2,
Wherein the projecting portion includes a first portion disposed in a region corresponding to the accommodating portion and a second portion extending from the first portion, the second portion having a first surface and a second surface, Shielding unit. The method of claim 3,
And the second portion is entirely or partially provided along the rim of the first portion. The method according to claim 1,
Wherein the receiving portion is formed as a receiving groove recessed from a surface of the second sheet to a predetermined depth or is formed as a through hole penetrating the second sheet. The method according to claim 1,
Wherein the plurality of minute pieces include minute pieces each of which has a curved shape, at least one side of which is not a straight line. The method according to claim 6,
Wherein the number of fine pieces of at least one of the total number of the plurality of micro pieces is curved is 50% or more. 8. The method of claim 7,
Wherein the number of fine pieces of at least one of the total number of the plurality of micro pieces is curved is 70% or more. The method according to claim 1,
Wherein the average particle size of the minute pieces constituting the second sheet is formed to be larger than the average particle size of the minute pieces constituting the first sheet. 10. The method of claim 9,
Wherein the average particle diameter of the minute pieces constituting the second sheet is 1.2 to 2 times the average particle diameter of the minute pieces constituting the first sheet. The method according to claim 1,
Wherein the plurality of minute pieces are formed at an irregular shape. The method according to claim 1,
Wherein the wireless recharging antenna is disposed in a region corresponding to one surface of the first sheet and the short-range communication antenna is disposed in a region corresponding to one surface of the second sheet. The method according to claim 1,
Wherein the first sheet and the second sheet are provided so as to have different permeabilities in a predetermined frequency band. The method according to claim 1,
Wherein the first sheet is laminated with a plurality of layers of a ribbon sheet of an amorphous alloy or a nano-crystal alloy. The method according to claim 1,
Wherein the ferrite sheet is made of Mn-Zn ferrite or Ni-Zn ferrite. The method according to claim 1,
Wherein the plurality of micro pieces are entirely insulated or partially insulated between neighboring micro pieces. An antenna unit provided in a combo type including a wireless charging antenna and a short-range communication antenna; And
And a shielding unit disposed on one side of the antenna unit for inducing a magnetic field, the wireless power charging module comprising:
The shielding unit includes:
A first sheet for improving characteristics of a wireless rechargeable antenna; And
And a second sheet having a receiving portion for improving the characteristics of the antenna for short-range communication and accommodating a part of the first sheet or an entire thickness of the first sheet,
Wherein the first sheet is formed of a ribbon sheet of an amorphous alloy or a nano-crystal alloy alloy which is flaked and divided into a plurality of micro-pieces and disposed in the receiving portion, and the second sheet is flaked to form a plurality of micro- The wireless power charging module comprising: 18. The method of claim 17,
Wherein the first sheet comprises protrusions protruding a certain thickness outward from one surface of the second sheet. 19. The method of claim 18,
Wherein the protruding portion includes a first portion disposed in a region corresponding to the receiving portion and a second portion extending from the first portion, the second portion having a first surface and a second surface, module. 20. The method of claim 19,
Wherein the second portion is entirely or partially provided along a rim of the first portion. 18. The method of claim 17,
Wherein the receiving portion is formed as a receiving groove which is recessed at a predetermined depth from one surface of the second sheet or a through hole penetrating the second sheet. 18. The method of claim 17,
Wherein the plurality of microparts comprises a microstructure in which at least one side is curved rather than straight. 23. The method of claim 22,
Wherein the number of fine pieces of at least one of the total number of the plurality of minute pieces is 50% or more. 24. The method of claim 23,
Wherein the number of fine pieces having at least one of the total number of the plurality of minute pieces in a curved shape is 70% or more. 18. The method of claim 17,
Wherein the average particle diameter of the microstructures constituting the second sheet is formed to have a size larger than an average particle diameter of the microstructures constituting the first sheet. 26. The method of claim 25,
Wherein the average particle diameter of the microstructures constituting the second sheet is 1.2 to 2 times the average particle diameter of the microstructures constituting the first sheet. 18. The method of claim 17,
Wherein the plurality of micro-pieces are atypical. 18. The method of claim 17,
Wherein the wireless charging antenna is disposed in a region corresponding to one surface of the first sheet and the short-range communication antenna is disposed in a region corresponding to one surface of the second sheet. 18. The method of claim 17,
Wherein the first sheet and the second sheet are provided to have different permeabilities in a predetermined frequency band. 18. The method of claim 17,
Wherein the first sheet is laminated with a plurality of layers of a ribbon sheet of an amorphous alloy or a nanocrystalline alloy. 18. The method of claim 17,
Wherein the ferrite sheet is made of Mn-Zn ferrite or Ni-Zn ferrite. 18. The method of claim 17,
Wherein the plurality of microparts are totally insulated or partially insulated between neighboring microparts.

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