KR20190058024A - Antenna mudule comprising shielding element - Google Patents

Abstract

According to an embodiment of the present invention, provided is an antenna module, which comprises: a coil layer including a wound first coil and a second coil surrounding a side surface of the first coil and wound coplanar with the first coil; a shield layer disposed on the coil layer, and including a first metal ribbon, a second metal ribbon, and a third metal ribbon which are sequentially stacked; and a protective layer disposed on the shield layer. The first metal ribbon, the second metal ribbon, and the third metal ribbon are configured to have the same composition, and the permeability of at least one metal ribbon among the first metal ribbon, the second metal ribbon, and the third metal ribbon is different from the permeability of the other metal ribbon.

Description

ANTENNA MUDULE COMPRISING SHIELDING ELEMENT < RTI ID = 0.0 >

The present invention relates to an antenna module, and more particularly, to a shielding member applied to an antenna module including a heterogeneous antenna.

With the development of wireless communication technology, there is a growing interest in wireless charging technology that wirelessly supplies power to electronic devices. Such a wireless charging technology can be applied not only to battery charging of portable terminals, but also to power supply for household electric appliances, power supply to electric vehicles and subways.

Typical wireless power transmission and reception techniques utilize the principles of magnetic induction or self-resonance. For example, when electrical energy is applied to a transmission antenna of a wireless power transmission device, the transmission antenna can convert electrical energy into electromagnetic energy and radiate it to the surroundings. The receiving antenna of the wireless power receiving apparatus can receive the electromagnetic energy radiated from the transmitting antenna and convert it into electric energy.

At this time, in order to increase the power transmission / reception efficiency, it is necessary to minimize the energy loss between the wireless power transmission apparatus and the wireless power reception apparatus. To this end, it is necessary to align the transmitting and receiving antennas within the effective distance. In addition, it is necessary to dispose the shielding member around the transmitting antenna and the receiving antenna so that the electromagnetic energy radiated from the transmitting antenna is focused in the direction of the receiving antenna.

The material of such a shielding member may vary depending on the frequency range and principle (for example, magnetic induction, self-resonance).

Meanwhile, as the technology related to the mobile terminal has developed, a wireless charging function, a near field communication (NFC) function, and a magnetic secure transmission (MST) function have been added to the mobile terminal. NFC is a non-contact communication technology that transmits and receives various wireless data within a distance of about 20 cm. And MST is one of the payment technologies.

1 is a cross-sectional view of an antenna module including two types of antennas, and FIG. 2 is a top view of a shielding layer of FIG.

1, the antenna module 1 includes a coil layer 10, a shield layer 20 disposed on one side of the coil layer 10, and a protective layer (not shown) disposed on one side of the shield layer 20 The coil layer 10 includes a wireless charging coil 12 and an NFC coil 14 wound around the side surface of the wireless charging coil 12. At this time, the numbers of turns and widths of the wireless charging coil 12 and the NFC coil 14 are different from each other, so that the magnitude of the magnetic field and the frequency band to be applied may vary. For example, the frequency band of several hundred kHz to several MHz may be applied to the wireless charging coil 12, and the frequency band of 13.56 MHz, which is higher than that of the NFC coil 14, may be applied. Accordingly, the material of the shielding layer suitable for optimizing the charging efficiency of the wireless charging coil 12 and the material of the shielding layer suitable for optimizing the recognition distance of the NFC coil 14 may be different. 1 and 2, the shielding layer 20 includes a metal ribbon layer 22 disposed on the wireless charging coil 12 and a ferrite disposed on the NFC coil 14. [ Layer 24 as shown in FIG. That is, the shielding layer 20 may have a frame shape in which the ferrite layer 24 surrounds the side surface of the metal ribbon layer 22.

However, if the shielding layer 20 is implemented in this form, there is a problem that the manufacturing process cost is added. In addition, since the ferrite is relatively expensive as compared with the metal ribbon, the material cost is also added, and the price competitiveness of the antenna module may be lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shielding member included in an antenna module including a heterogeneous antenna.

An antenna module according to an embodiment of the present invention includes a coil layer including a coiled first coil and a second coil wound around the side surface of the first coil and coiled in the same plane as the first coil, And a protective layer disposed on the shield layer, wherein the shield layer includes a first metal ribbon, a second metal ribbon, and a third metal ribbon that are sequentially stacked, the first metal ribbon, Wherein the second metal ribbon and the third metal ribbon have the same composition and the permeability of at least one metal ribbon among the first metal ribbon, the second metal ribbon and the third metal ribbon is different from the permeability of the remaining metal ribbon It is different.

The permeability of the first metal ribbon may be lower than the permeability of at least one of the second metal ribbon and the third metal ribbon.

Wherein the first metal ribbon, the second metal ribbon and the third metal ribbon are both cracked and the cracking pattern of the first metal ribbon is at least a cracking pattern of the second metal ribbon and a cracking pattern of the third metal ribbon It can be different from one.

The particle size of the first metal ribbon may be less than at least one of the particle size of the second metal ribbon and the particle size of the third metal ribbon.

Wherein the first coil is a wireless charging coil and the second coil is a coil for a near field communication (NFC), and the size of the first metal ribbon is a size of the second metal ribbon and a size of the third metal ribbon Wherein at least one of the second metal ribbon and the third metal ribbon is arranged to overlap the first coil and the first metal ribbon is arranged to overlap the first coil and the second coil, .

The first metal ribbon is disposed on the coil layer and the second metal ribbon, the third metal ribbon and the protective layer are sequentially disposed on the first metal ribbon in a direction away from the coil layer .

The second metal ribbon and the third metal ribbon stacked are disposed on the coil layer, and the first metal ribbon and the protection layer are arranged in a direction away from the coil layer, and the second metal ribbon and the third metal ribbon And the edges of the first metal ribbon and the protective layer may be bent toward the coil layer.

Wherein edges of the first metal ribbon and the protective layer surround the side surfaces of the second metal ribbon and the third metal ribbon and between the side surfaces of the first metal ribbon and the second metal ribbon and the third metal ribbon An air layer may be formed.

An adhesive layer is further disposed between the first metal ribbon and the second metal ribbon and between the second metal ribbon and the third metal ribbon, and the adhesive layer may include magnetic powder.

And a third coil surrounding a side of the first coil between the first coil and the second coil and disposed coplanar with the first coil and the second coil.

According to the embodiment of the present invention, it is possible to obtain a shielding member which can be simultaneously applied to different types of antennas. Particularly, according to the embodiment of the present invention, it is possible to obtain a shielding member which is simple in manufacturing process and low in manufacturing cost while satisfying high wireless charging efficiency and high NFC (near field communication) recognition distance at the same time.

1 is an example of a cross-sectional view of an antenna module including a heterogeneous antenna.
2 is a top view of the shielding layer of FIG.
3 is a block diagram illustrating a wireless power transceiver system in accordance with an embodiment of the present invention.
4 is a diagram showing a part of a wireless power transmission apparatus.
5 is a diagram showing a part of a wireless power receiving apparatus.
6 is a cross-sectional view of an antenna module according to an embodiment of the present invention.
7 (a) and 7 (b) are top views of the shielding layer of Fig.
8 is a cross-sectional view of a coil layer and a shield layer according to one embodiment of the present invention.
9 is a cross-sectional view of a coil layer and a shielding layer according to another embodiment of the present invention.
10 is a cross-sectional view of a coil layer and a shield layer according to another embodiment of the present invention.
11 to 14 are sectional views of a coil layer and a shielding layer according to another embodiment of the present invention.
15 to 16 are examples of metal ribbons on which a cracking pattern is formed.
17 shows a change in permeability according to the particle size of the silver metal ribbon.
18 shows the NFC recognition distance variation according to the particle size of the metal ribbon.
FIG. 19 (a) is a cross-sectional view of an antenna module according to Comparative Example 1, and FIG. 19 (b) is a cross-sectional view of an antenna module according to Comparative Example 2.
20 shows the NFC recognition distance of the antenna module manufactured according to the comparative example and the example.
21 shows the wireless charging efficiency of the antenna module manufactured according to the comparative example and the example.
22 (b) is a cross-sectional view in which 22 (a) is formed of a plurality of layers, and 22 (c) is a cross-sectional view of a plurality of coil layers Is a cross-sectional view according to an embodiment in which a substrate is disposed.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

3 is a block diagram illustrating a wireless power transceiver system in accordance with an embodiment of the present invention.

Referring to FIG. 3, a wireless power transmission / reception system includes a wireless power transmission apparatus 100 and a wireless power reception apparatus 200. The wireless power transmission apparatus 100 applies electrical energy to a transmission antenna, and the transmission antenna converts electrical energy into electromagnetic energy and radiates it to the surroundings. The wireless power receiving apparatus 200 receives electromagnetic energy radiated from a transmitting antenna using a receiving antenna and converts the received electromagnetic energy into electric energy to charge the antenna.

Here, the wireless power transmission apparatus 100 is, for example, a transmission pad. The wireless power receiving apparatus 200 may be a portable terminal to which wireless power transmission / reception technology is applied, a household / personal electronic product, a transportation means, and the like. A mobile terminal to which the wireless power transmission / reception technology is applied, a household / personal electronic product, a transportation means, etc. may include only the wireless power receiving apparatus 200 or may include both the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 Can be set.

Meanwhile, the wireless power receiving apparatus 200 may be configured to include a module having both a wireless power conversion (WPC) function and a near field communication (NFC) function. At this time, the wireless power receiving apparatus 200 may perform short-range wireless communication with the external apparatus 300 including the NFC module.

FIG. 4 is a diagram showing a part of a wireless power transmission apparatus, and FIG. 5 is a diagram showing a part of a wireless power reception apparatus.

4, the wireless power transmission apparatus 100 includes a transmission circuit (not shown), a soft magnetic core 110, a transmission antenna 120, and a permanent magnet 130.

The soft magnetic core 110 may be made of a soft magnetic material having a thickness of several mm. The transmission antenna 120 may be a transmission coil, and the permanent magnet 130 may be surrounded by a transmission antenna 120. The permanent magnet 130 may be omitted depending on the specifications.

Referring to FIG. 5, the wireless power receiving apparatus 200 includes a receiving circuit (not shown), a soft magnetic layer 210, and a receiving coil 220. The soft magnetic layer 210 may be formed on a substrate (not shown). The substrate may be composed of multiple layers of fixed sheets and may be bonded to the soft magnetic layer 210 to fix the soft magnetic layer 210.

The soft magnetic layer 210 concentrates the electromagnetic energy radiated from the transmitting antenna 120 of the wireless power transmission apparatus 100. In this specification, the soft magnetic layer 210 can be mixed with the shielding member.

On the soft magnetic layer 210, a receiving coil 220 is formed. The receiving coil 220 may be wound on the soft magnetic layer 210 in a direction parallel to the plane of the soft magnetic layer 210. For example, a receiving coil applied to a smart phone may be in the form of a spiral coil having an outer diameter of 50 mm or less and an inner diameter of 20 mm or more. The receiving circuit converts the electromagnetic energy received through the receiving coil 220 into electric energy, and charges the battery (not shown) with the converted electric energy.

Although not shown, a heat-radiating layer may be further included between the soft magnetic layer 210 and the receiving coil 220. In this specification, the receiving coil 220 may be used in combination with a wireless charging coil. When the wireless power receiving apparatus 200 has the WPC function and the NFC function at the same time, the NFC coil 230 may be further stacked on the soft magnetic layer 210. The NFC coil 230 may be formed so as to surround the outside of the receiving coil 220.

Each of the reception coil 220 and the NFC coil 230 may be electrically connected to each other through a terminal 240.

According to an embodiment of the present invention, there is provided a shielding member capable of satisfying all frequency characteristics of different types of antennas in an antenna module including different types of antennas.

FIG. 6 is a cross-sectional view of an antenna module according to an embodiment of the present invention, and FIGS. 7 (a) and 7 (b) are top views of the shielding layer of FIG.

6 through 7A, the antenna module 600 includes a coil layer 610, a shielding layer 620, and a protective layer 630.

The coil layer 610 includes a coiled first coil 612 and a second coil 614 that surrounds the sides of the first coil 612 and is wound in the same plane as the first coil 612.

Although not shown, a portion of the second coil 614 may traverse the first coil 612 and may be disposed along a portion of the inner side of the first coil 612.

Although the first coil 612 is wound in a spiral shape and the second coil 614 is wound in a rectangular shape, the shape of the winding is not limited thereto. It should be understood that the first coil 612 and the second coil 614 are both wound in one layer, but not limited thereto, and at least one of the first coil 612 and the second coil 614 may be wound Layer winding. The winding of two or more layers will be described later.

Here, the first coil 612 is a wireless charging coil, and the second coil 614 is a near field coil (NFC) coil. However, the present invention is not limited thereto. The embodiment of the present invention can be applied even when the NFC coil is wound inside the wireless charging coil. The first coil 612 and the second coil 614 are not limited to the first coil 612 and the second coil 614. For example, A third coil (not shown) which is different from the coil 612 and the second coil 614 may be further disposed. The third coil may be, for example, a coil for magnetic secure transmission (MST), and surrounds the side of the first coil 612 between the first coil 612 and the second coil 614, 612 and the second coil 614 and a part of the third coil may be disposed on the outer surface of the second coil 614. [

Next, the shielding layer 620 is disposed on the coil layer 610 and includes a plurality of sequentially stacked metal ribbons. Although the shielding layer 620 is shown and described as including a first metal ribbon 622, a second metal ribbon 624 and a third metal ribbon 626, it is not limited thereto, 620 may comprise a plurality of metal ribbons of two or more. Here, the metal ribbon may be an amorphous metal ribbon or a nanocrystalline metal ribbon. The metal ribbon may be, for example, an alloy ribbon including at least one of Fe, Co, Ni and Cu, or a metal ribbon including one of Fe, Co, Ni and Cu, but is not limited thereto.

The protective layer 630 is disposed on the shield layer 620 and may support the shield layer 620 and may discharge heat generated from the coil layer 610 and the shield layer 620 to the outside have. The protective layer 630 may, for example, be a graphite sheet, but is not limited thereto.

According to an embodiment of the present invention, a plurality of metal ribbons, for example, a first metal ribbon 622, a second metal ribbon 624, and a third metal ribbon 626 have the same composition, The permeability of the metal ribbon of at least one of the second metal ribbon 622, the second metal ribbon 624 and the third metal ribbon 626 may be different from that of the remaining metal ribbon. For example, the permeability of the first metal ribbon 622 has a permeability that is suitable for the frequency band in which one of the first coil 612 and the second coil 614 operates, and the permeability of the second metal ribbon 624 and third The permeability of the metal ribbon 626 may have a permeability suitable for the frequency band in which the other of the first coil 612 and the second coil 614 operates. For example, if the first coil 612 is a wireless charging coil and the second coil 614 is an NFC coil, the magnetic permeability of the first metal ribbon 622 is a frequency that is applied to the second coil 614 And can have a permeability suitable for the frequency range of several hundred kHz to several MHz which is the frequency band applied to the second metal ribbon 624 and the third metal ribbon 626. [ The maximum permeability obtained for the operating frequency is determined by Snoek's limit, and the self-resonant frequency can be inversely proportional to the permeability. That is, the permeability of the first metal ribbon 622 may be lower than the permeability of the second metal ribbon 624 and the third metal ribbon 626. For example, the permeability of the first metal ribbon 622 may be 20 to 200, preferably 50 to 200, more preferably 100 to 200, and the second metal ribbon 624 and the third metal ribbon 626 ) May be 200 to 800, preferably 400 to 800, more preferably 600 to 800.

Accordingly, in the antenna module including the different types of antennas, high wireless charging efficiency and high NFC (near field communication) recognition distance can be satisfied at the same time by using a shielding member having a single composition.

In order for a plurality of metal ribbons having the same composition to have different permeability, the plurality of metal ribbons can be cracked in different patterns.

7 (b) is a top view of a modification of the shielding layer according to an embodiment of the present invention. The same descriptions as those described in Figs. 6 to 7 (a) are not repeated.

7B, a second coil 614 may be extended to a portion of the shield layer 620 where a step is formed so that the shield layer 620 is not present.

8 is a cross-sectional view of a coil layer and a shield layer according to one embodiment of the present invention.

8, the coil layer 610 includes a coiled first coil 612 and a second coil 612 wound around the side of the first coil 612 and coplanar with the first coil 612 614). Here, the first coil 612 is a wireless charging coil and the second coil 614 is a coil for an NFC (near field coil). The shield layer 620 is disposed on the coil layer 610 and includes a plurality of sequentially stacked metal ribbons. Between the coil layer 610 and the shielding layer 620 and between the metal ribbons 622, 624 and 626 included in the shielding layer 620 may be adhered by the adhesive layer 640. At this time, the adhesive layer 640 may further include magnetic powder.

The first metal ribbon 622, the second metal ribbon 624 and the third metal ribbon 626 have the same composition, and the permeability of the first metal ribbon 622 is the same as the second Is lower than the permeability of the metal ribbon 624 and the third metal ribbon 626. The first metal ribbon 622, the second metal ribbon 624 and the third metal ribbon 626 are both cracked while the particle size of the first metal ribbon 622 is larger than the particle size of the second metal ribbon 624 The particle size and the particle size of the third metal ribbon 626 may be cracked. The permeability of the first metal ribbon 622 is 20 to 200, preferably 50 to 200, more preferably 100 to 200, and the permeability of the second metal ribbon 624 and the third metal ribbon 626 is The particle size of the second metal ribbon 624 and the third metal ribbon 626 is greater than the particle size of the first metal ribbon 622 to form the first metal ribbon 624 and the third metal ribbon 626 in the range of 200 to 800, preferably 400 to 800, and more preferably 600 to 800. Cracked to be 1.1 to 6 times, preferably 1.2 to 5.5 times, and more preferably 1.4 to 5.3 times larger than the particle size. Here, the first metal ribbon 622 is disposed on the coil layer 610, and the second metal ribbon 624 and the third metal ribbon 626 are arranged in a direction away from the coil layer 610, 622). ≪ / RTI > The comparison of the particle sizes may be applied equally to the D50.

Alternatively, the total number of particles of the first metal ribbon 622 may be greater than the total number of particles of the second metal ribbon 624 or the third metal ribbon 626, and the second metal ribbon 624, Can be cracked to 1.1 to 10 times, preferably 1.2 to 8 times, and more preferably 1.4 to 6 times as many as the number of particles of the metal ribbon 626.

If some of the plurality of metal ribbons included in the shielding layer 620 have a permeability of about 150 and others have a permeability of about 600, the metal ribbon having a permeability of about 150 may have high frequency response Therefore, the recognition distance of the NFC coil can be improved, and the metal ribbon having the permeability of about 600 can cope with low frequencies, thereby improving the wireless charging efficiency.

9 is a cross-sectional view of a coil layer and a shielding layer according to another embodiment of the present invention. Duplicate descriptions will be omitted for the same contents as those described in Fig.

Referring to FIG. 9, the size of the first metal ribbon 622 may be larger than the size of the second metal ribbon 624 and the third metal ribbon 626. The first metal ribbon 622 is arranged to overlap with the first coil 612 and the second coil 614 and the second metal ribbon 624 and the third metal ribbon 626 are arranged to overlap with the first coil 612 and the second coil 614. [ And may be disposed so as not to overlap the second coil 614. Accordingly, only the first metal ribbon 622 having a permeability of 20 to 200, preferably 50 to 200, and more preferably 100 to 200 affects the second coil 614, which is a NFC coil, and the permeability is 200 The second metal ribbon 624 and the third metal ribbon 626 having a diameter of 800 to 800, preferably 400 to 800 and more preferably 600 to 800 do not affect the first metal ribbon 622, It is possible to improve the recognition distance of the second coil 614, which is the second coil 614.

10 is a cross-sectional view of a coil layer and a shield layer according to another embodiment of the present invention. The same descriptions as those described in Figs. 8 to 9 will not be repeatedly described.

10, the permeability of the first metal ribbon 622 and the permeability of the second metal ribbon 624 are lower than the permeability of the third metal ribbon 626. [ The first metal ribbon 622, the second metal ribbon 624 and the third metal ribbon 626 are all cracked so that the particle size of the first metal ribbon 622 and the particle size of the second metal ribbon 624 The particle size can be cracked smaller than the particle size of the third metal ribbon 626. [ The permeability of the first metal ribbon 622 and the permeability of the second metal ribbon 624 are set to 20 to 200, preferably 50 to 200, more preferably 100 to 200, and the permeability of the third metal ribbon 626 The particle size of the third metal ribbon 626 is selected so that the particle size of the first metal ribbon 622 and the particle size of the second metal ribbon 622 are different from each other. In order to form a permeability of 200 to 800, preferably 400 to 800, more preferably 600 to 800, The ribbons 624 may be cracked to 1.1 to 6 times, preferably 1.2 to 5.5 times, and more preferably 1.4 to 5.3 times larger than the particle size. Alternatively, the total number of particles of the first metal ribbon 622 or the second metal ribbon 624 may be greater than the total number of particles of the third metal ribbon 626, and the number of particles of the third metal ribbon 626 To 1.1 to 10 times, preferably 1.2 to 8 times, and preferably to 1.4 to 6 times more than that of the substrate.

The size of the first metal ribbon 622 and the size of the second metal ribbon 624 may be larger than the size of the third metal ribbon 626. [ The first metal ribbon 622 and the second metal ribbon 624 are arranged to overlap the first coil 612 and the second coil 614 and the third metal ribbon 626 is arranged to overlap the first coil 612 and the second coil 614. [ 612 and may not be overlapped with the second coil 614.

According to this, it is possible to obtain a shielding member in which the recognition distance and the wireless charging efficiency of the NFC coil are improved at the same time.

11 to 14 are sectional views of a coil layer and a shielding layer according to another embodiment of the present invention. Duplicate explanations of the same contents as those described in Figs. 8 to 10 will be omitted.

11 to 14, a shield layer 620 including a plurality of metal ribbons is disposed on a coil layer 610, and a third metal ribbon 626, unlike the embodiment of FIGS. 8 to 10, The second metal ribbon 624 and the first metal ribbon 622 may be disposed on the third metal ribbon 626 in a direction away from the coil layer 610 have.

Referring to FIG. 11, the size of the first metal ribbon 622 may be larger than the size of the second metal ribbon 624 and the third metal ribbon 626, as in the embodiment of FIG. The first metal ribbon 622 is arranged to overlap with the first coil 612 and the second coil 614 and the second metal ribbon 624 and the third metal ribbon 626 are arranged to overlap with the first coil 612 and the second coil 614. [ And may be disposed so as not to overlap the second coil 614.

12, the first metal ribbon 622, the second metal ribbon 624, and the third metal ribbon 626 have the same composition and are all cracked, as in the embodiment of FIG. 8, The particle size of the ribbon 622 may be less than the particle size of the second metal ribbon 624 and the particle size of the third metal ribbon 626. 10, the size of the first metal ribbon 622 may be larger than the size of the second metal ribbon 624 and the size of the third metal ribbon 626. [ The first metal ribbon 622 is arranged to overlap with the first coil 612 and the second coil 614 and the second metal ribbon 624 and the third metal ribbon 626 are arranged to overlap with the first coil 612 and the second coil 614. [ And may be disposed so as not to overlap the second coil 614.

13, the first metal ribbon 622, the second metal ribbon 624, and the third metal ribbon 626 have the same composition and are all cracked, as in the embodiment of FIG. 10, The particle size of the metal ribbon 622 and the particle size of the second metal ribbon 624 may be smaller than the particle size of the third metal ribbon 626. [ The size of the first metal ribbon 622 and the size of the second metal ribbon 624 may be larger than the size of the third metal ribbon 626. [ The first metal ribbon 622 and the second metal ribbon 624 are arranged to overlap the first coil 612 and the second coil 614 and the third metal ribbon 626 is arranged to overlap with the first coil 612 and the second coil 614. [ And may be disposed so as not to overlap the second coil 614.

11 to 13, when a metal ribbon having a small size is disposed on the coil layer 610 and a metal ribbon having a large size is disposed in a direction away from the coil layer 610 as compared with a metal ribbon having a small size, The edge of the large-sized metal ribbon can be bent toward the coil layer 610. [

14, the edges of the first metal ribbon 622 and the protective layer 630 are bent toward the coil layer 610 so that the edges of the first metal ribbon 622 and the protective layer 630 are An air layer is formed between the side surfaces of the second metal ribbon 624 and the third metal ribbon 626 and the first metal ribbon 622 so as to surround the side surfaces of the second metal ribbon 624 and the third metal ribbon 626 .

The distance between the first metal ribbon 622 and the second coil 614 is reduced so that the NFC recognition distance of the second coil 614 is improved as well as the distance between the second metal ribbon 624 and the third metal ribbon 624 Since the side surface of the first metal ribbon 626 is shielded by the first metal ribbon 622, the wireless charging performance can also be improved.

Hereinafter, effects according to the embodiment of the present invention will be described with reference to experimental results.

15 to 16 are examples of metal ribbons on which a cracking pattern is formed.

15 (a), 15 (b), and 15 (c) show an example of a first metal ribbon in which a cracking pattern having a relatively small particle size is formed, Is an example of a third metal ribbon in which a cracking pattern having a relatively large particle size is formed.

To form the cracking pattern shown in FIG. 15, nanocrystalline metal ribbons (VAC vitroperm 800) were cracked 12 times and photographed under an optical microscope. To form a cracking pattern according to FIG. 16, nanocrystalline metal ribbons 800) was photographed with an optical microscope after two cracks. As a result, it can be seen that the particle size of the metal ribbon according to FIG. 16 is 1.4 to 5.3 times the particle size of the metal ribbon according to FIG. 15, and as a result, the particle size decreases as the number of cracking increases .

Table 1 and Fig. 17 show the change in permeability according to the particle size of the silver metal ribbon.

For this purpose, nanocrystalline metal ribbons (VAC vitroperm 800) were cracked twice, four times, eight times, and twelve times under annealing conditions of 495 ° C and 7Bar fixed conditions, and Ls and Q values at 13.56 MHz, Were measured. Experiments were conducted on three samples for each case, and the permeability was calculated as an average value.

Ls Q Investment ratio Number of cracking Sample 1 Sample 2 Sample 3 Average Sample 1 Sample 2 Sample 3 Average Average 2 1.2881E-06 1.29E-06 4.63E + 00 4.63E + 00 660 4 1.2862E-06 1.29E-06 5.55E + 00 5.55E + 00 465 8 1.1478E-06 1.1451E-06 1.1307E-06 1.14E-06 7.68E + 00 7.96E + 00 7.30E + 00 7.65E + 00 250 12 9.8856E-07 9.9639E-07 9.5555E-07 9.80E-07 1.04E + 01 1.07E + 01 1.03E + 01 1.05E + 01 144

Referring to Table 1 and FIG. 17, it can be seen that as the number of cracking increases, that is, as the particle size decreases, the permeability decreases.

18 shows the NFC recognition distance variation according to the particle size of the metal ribbon.

For this purpose, after nanocrystalline metal ribbon (VAC vitroperm 800) was cracked twice, four times, eight times and twelve times under annealing conditions of 495 ° C and 7Bar fixed conditions, the resonance frequency of the shielding member and NFC coupling module was 13.56 MHz , And the distance between the shielding member and the NFC was increased by using a spacer to confirm the recognition distance.

Referring to FIG. 18, it can be seen that the NFC recognition distance increases as the number of cracking increases, that is, as the permeability decreases. Accordingly, it is possible to adjust the permeability by adjusting the number of cracking, that is, the particle size, and accordingly, it can be tuned to an appropriate permeability according to the frequency band.

Next, the experimental results of the NFC recognition distance and the wireless charging efficiency using the antenna module manufactured according to the comparative example and the example will be described.

FIG. 19 (a) is a cross-sectional view of an antenna module according to Comparative Example 1, and FIG. 19 (b) is a cross-sectional view of an antenna module according to Comparative Example 2.

Referring to FIG. 19 (a), in the antenna module according to Comparative Example 1, a shield layer is disposed on a coil layer, and the shield layer has a permeability of 700 and includes three layers of metal ribbon and ferrite .

Referring to FIG. 19 (b), in the antenna module according to Comparative Example 2, a shielding layer is disposed on the coil layer, and the shielding layer has a permeability of 700 and is formed to include a metal ribbon laminated in three layers.

The antenna module according to the first embodiment is fabricated to have the structure of FIG. 9, and the antenna module according to the second embodiment has the structure of FIG.

Table 2 and FIG. 20 show NFC recognition distances of the antenna module manufactured according to the comparative example and the embodiment, and FIG. 21 shows the wireless charging efficiency of the antenna module manufactured according to the comparative example and the example.

Experiment number Frequency (MHz) Recognition distance (mm) Comparative Example 1 13.6 50 Comparative Example 2 13.6 36 Example 1 13.5 39 Example 2 13.6 41

Referring to Table 2 and FIG. 20, the NFC recognition distances of Examples 1 and 2 are shorter than those of Comparative Example 1, but higher than those of Comparative Example 2. That is, the permeability of the first metal ribbon is smaller than the permeability of the second metal ribbon and the third metal ribbon, the size of the first metal ribbon covers not only the wireless charging coil but also the NFC coil, Or when the permeability of the first metal ribbon and the second metal ribbon is smaller than the permeability of the third metal ribbon and the size of the first metal ribbon and the second metal ribbon When the size of the third metal ribbon covers only the wireless charging coil, the magnetic permeability of the plurality of stacked metal ribbons is the same, and the plurality of stacked plurality of metal ribbons It can be seen that the NFC recognition distance is larger than that of Comparative Example 2 in which there is no difference in size between metal ribbons.

21, the transmission efficiency of Comparative Example 1 is 82.7% at 15 W, but the transmission efficiencies of Examples 1 and 2 are 84.2% and 83.2%, respectively. Therefore, compared to Comparative Example 1, It can be seen that the charging efficiency is improved.

As described above, according to the first and second embodiments, it is possible to obtain the shielding member which simultaneously satisfies the NFC recognition distance and the wireless charging efficiency.

22 (b) is a cross-sectional view in which 22 (a) is formed of a plurality of layers, and 22 (c) is a cross-sectional view in which a plurality of coil layers Sectional view according to an embodiment in which a substrate is disposed between the substrates.

22 (a), the first coil 612 and the second coil 614 of the coil layer 610 may have a rectangular shape. Each of the four sides of the first coil 612 and the second coil 614 may all include planes.

Referring to FIG. 22 (b), the first coil 612 and the second coil 614 of the coil layer 610 may be formed of a plurality of layers. Referring to FIG. 22 (c) A base layer (not shown) may be disposed between the first coil 612 and the second coil 614. Further, the first coils 612 formed of a plurality of layers may be electrically connected by holes (not shown) formed in the base layer, and may be connected in parallel or in series. Similarly, the second coils 614 formed of a plurality of layers may be electrically connected by holes (not shown) formed in the base layer, and may be connected in parallel or in series. Further, the first coil 612 and the second coil 614 may be disposed on one substrate layer.

In addition, although the first coil 612 and the second coil 614 are both shown as squares including planes, the sides of the first coil 612 and the second coil 614 may include curved surfaces (not shown) It is possible.

Although the upper and lower surfaces of the first coil 612 and the second coil 612 are shown to have the same length, the surface closer to the substrate with respect to the substrate may be shorter than the surface farther from the substrate.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

Claims (10)

A coil layer including a first coil wound around the first coil and a second coil wound around the side of the first coil and coplanar with the first coil,
A shield layer disposed on the coil layer, the shield layer including a first metal ribbon, a second metal ribbon, and a third metal ribbon sequentially stacked, and
And a protective layer disposed on the shield layer,
Wherein the first metal ribbon, the second metal ribbon and the third metal ribbon have the same composition,
Wherein the permeability of at least one of the first metal ribbon, the second metal ribbon, and the third metal ribbon is different from the permeability of the remaining metal ribbon. The method according to claim 1,
Wherein the permeability of the first metal ribbon is lower than the permeability of at least one of the second metal ribbon and the third metal ribbon. 3. The method of claim 2,
The first metal ribbon, the second metal ribbon and the third metal ribbon are all cracked,
Wherein the cracking pattern of the first metal ribbon is different from at least one of a cracking pattern of the second metal ribbon and a cracking pattern of the third metal ribbon. The method of claim 3,
Wherein a particle size of the first metal ribbon is cracked less than at least one of a particle size of the second metal ribbon and a particle size of the third metal ribbon. 3. The method of claim 2,
The first coil is a wireless charging coil, the second coil is a coil for NFC (near field communication)
Wherein a size of the first metal ribbon is larger than at least one of a size of the second metal ribbon and a size of the third metal ribbon,
Wherein the first metal ribbon is disposed to overlap with the first coil and the second coil, and at least one of the second metal ribbon and the third metal ribbon is disposed to overlap with the first coil. 6. The method of claim 5,
Wherein the first metal ribbon is disposed on the coil layer and the second metal ribbon, the third metal ribbon, and the protective layer are sequentially disposed on the first metal ribbon in a direction away from the coil layer, . 6. The method of claim 5,
The second metal ribbon and the third metal ribbon stacked are disposed on the coil layer, and the first metal ribbon and the protection layer are arranged in a direction away from the coil layer, and the second metal ribbon and the third metal ribbon Respectively,
And the edges of the first metal ribbon and the protective layer are bent toward the coil layer. 8. The method of claim 7,
Wherein edges of the first metal ribbon and the protective layer surround side surfaces of the second metal ribbon and the third metal ribbon,
And an air layer is formed between the first metal ribbon, the second metal ribbon, and the side surfaces of the third metal ribbon. The method according to claim 1,
An adhesive layer is further disposed between the first metal ribbon and the second metal ribbon and between the second metal ribbon and the third metal ribbon,
Wherein the adhesive layer comprises magnetic powder. The method according to claim 1,
And a third coil surrounding a side of the first coil between the first coil and the second coil and coplanar with the first coil and the second coil.

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