Magnetic field shielding sheet for antenna module and antenna module including the same

Abstract

The present invention provides a magnetic field shielding sheet for an antenna module. The magnetic field shielding sheet for an antenna module according to an exemplary embodiment of the present invention is applicable to an antenna module including a magnet for an alignment position and an antenna unit operating in a prescribed frequency band, wherein the magnetic field shielding sheet for an antenna module includes a main shielding sheet made of a magnetic material to shield a magnetic field generated from the antenna unit, and at least one magnetic saturation preventing member laminated on a surface of the main shielding sheet to prevent magnetic saturation of the main shielding sheet by inducing a direct current magnetic field generated from the magnet. The magnetic saturation preventing member has a number corresponding to the magnet provided in the antenna module, and is disposed on a surface of the main shielding sheet in a manner to be located in a position corresponding to the magnet provided in the antenna module.

Description

Technical Field

[0001] This invention relates to a magnetic field shielding sheet for an antenna module and an antenna module including the same. Background Technology

[0002] Near Field Communication (NFC) and wireless power transmission are essentially contactless transmission methods.

[0003] This non-contact transmission method is achieved through an antenna and a magnetic field shield, wherein the antenna is used to transmit or receive magnetic fields, and the magnetic field shield is disposed on one surface of the antenna to stably transmit or receive magnetic fields.

[0004] Typically, sheets made of magnetic materials, such as amorphous ribbon sheets, ferrite sheets, or polymer sheets, are used as magnetic shielding sheets.

[0005] On the other hand, in contactless transmission methods, stable transmission efficiency can be ensured when the receiving module and the transmitting module are aligned with each other. For example, wireless power transmission exhibits high efficiency when the wireless power receiving module and the wireless power transmitting module are aligned with each other.

[0006] Therefore, a scheme is proposed to stably align the wireless power receiving module and the wireless power transmitting module by including magnets for alignment in the wireless power receiving module and the wireless power transmitting module, respectively.

[0007] However, this scheme has the following problem: the magnets included in the wireless power receiving module and the wireless power transmitting module will generate a DC magnetic field, and the DC magnetic field generated from the magnets will cause the magnetic field shielding sheet used to improve the antenna performance to become magnetically saturated.

[0008] To address this issue, using a thicker magnetic field shield would increase the overall thickness of the wireless power receiving module or wireless power transmitting module.

[0009] Therefore, a solution is needed that can minimize the effects of the DC magnetic field generated from the magnet without increasing the total thickness. Summary of the Invention

[0010] The technical problem to be solved by the present invention

[0011] The present invention addresses the above-mentioned problems and aims to provide a magnetic field shielding sheet for an antenna module and an antenna module including the sheet, which can prevent magnetic saturation caused by a DC magnetic field generated from a magnet.

[0012] Technical solution

[0013] To achieve the above objectives, the present invention provides a magnetic field shielding sheet for an antenna module, suitable for an antenna module including magnets for alignment and antenna elements operating in a specified frequency band. The magnetic field shielding sheet for the antenna module includes: a main shielding sheet made of a magnetic material to shield magnetic fields generated from the antenna elements; and at least one anti-magnetic saturation member stacked on a surface of the main shielding sheet to prevent magnetic saturation of the main shielding sheet by inducing a DC magnetic field generated from the magnets. The anti-magnetic saturation member has a number corresponding to the magnets disposed in the antenna module and is configured to be located at positions corresponding to the magnets disposed in the antenna module.

[0014] Furthermore, the antimagnetic saturation member can be configured to have a cross-sectional area that is relatively wider than that of the magnet.

[0015] Furthermore, the thickness of the antimagnetic saturation member can be configured to have a thickness of less than 1 / 2 relative to the thickness of the main shielding sheet.

[0016] Furthermore, the antimagnetic saturation component can be made of a material having a saturation magnetic flux density of 1.2 Tesla or higher. As an example, the antimagnetic saturation component can be a strip of amorphous alloy or nanocrystalline alloy. In this case, the antimagnetic saturation component can be a multilayer sheet formed by stacking multiple layers of the strip sheet.

[0017] Furthermore, the magnetic field shielding sheet for the antenna module may further include a first protective film and a second protective film attached to the main shielding sheet in a manner that covers the exposed surface of the main shielding sheet. Either the first protective film or the second protective film is attached to the main shielding sheet in a manner that covers one surface of the main shielding sheet and the exposed surface of the anti-magnetic saturation member layered on one surface of the main shielding sheet.

[0018] On the other hand, the present invention provides an antenna module comprising: an antenna unit including a circuit board, at least one antenna patterned on at least one surface of the circuit board, and at least one magnet disposed on one surface of the circuit board; and a magnetic field shielding sheet disposed on one surface of the antenna unit to shield magnetic fields generated from the at least one antenna. The magnetic field shielding sheet is the antenna module described above for use with a magnetic field shielding sheet in an antenna module.

[0019] In addition, the antenna may include one or more of the following: wireless power transmission antenna, near field communication (NFC) antenna, and magnetic secure transmission (MST) antenna.

[0020] Furthermore, the magnetic field shielding sheet can be attached to a surface of the circuit board in such a way that the antimagnetic saturation member is disposed between the circuit board and the main shielding sheet.

[0021] Furthermore, the magnets can be configured as a pair with different polarities at positions corresponding to the antimagnetic saturation member.

[0022] Beneficial effects

[0023] According to the present invention, even if the antenna element includes a magnet for alignment, magnetic saturation of the main shielding sheet due to the DC magnetic field generated in the magnet can be prevented. Thus, the magnetic field shielding sheet for antenna modules of the present invention can minimize the influence of the DC magnetic field generated from the magnet while maintaining the same thickness as conventional shielding sheets. Attached Figure Description

[0024] Figure 1 This is a diagram illustrating a magnetic field shielding sheet for an antenna module according to an embodiment of the present invention.

[0025] Figure 2 It shows along Figure 1 A sectional view taken along the AA direction.

[0026] Figure 3 It is along Figure 1 A cross-sectional view taken along the AA direction, and a diagram showing another form of the main shielding sheet.

[0027] Figure 4 This is a diagram illustrating an antenna module according to an embodiment of the present invention.

[0028] Figure 5 It is along Figure 4 A cross-sectional view taken along the BB direction, showing the antenna element and the magnetic field shield in a combined state.

[0029] Figure 6 It shows that it can be applied to Figure 4 A diagram of another form of the antenna element.

[0030] Figure 7 It shows that it can be applied to Figure 4 A diagram showing another form of the antenna element in the diagram. Detailed Implementation

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings to enable those skilled in the art to readily implement the present invention. The present invention can be implemented in various different forms and is not limited to the embodiments described herein. For the purpose of clearly describing the present invention in the drawings, parts irrelevant to the description will be omitted, and throughout the specification, the same reference numerals are assigned to the same or similar constituent elements.

[0032] like Figure 1 As shown, a magnetic field shielding sheet 100 for an antenna module according to an embodiment of the present invention includes a main shielding sheet 110, an anti-magnetic saturation component 120, and a protective film 130.

[0033] like Figures 4 to 7 As shown, this magnetic field shielding sheet 100 for antenna modules can be applied to antenna elements 210, 210', 210" which include at least one magnet 218 for alignment.

[0034] In other words, when the magnetic field shielding sheet 100 for the antenna module according to an embodiment of the present invention, together with the antenna units 210, 210', 210" to form an antenna module 200, the magnetic field shielding sheet 100 can be disposed on a surface of the antenna units 210, 210', 210" and the anti-magnetic saturation member 120 can be disposed at a position corresponding to the magnets 218, 218' disposed on the antenna units 210, 210', 210".

[0035] The antenna units 210, 210', and 210" may include: a circuit board 212; at least one antenna 214 and 216 patterned on at least one surface of the circuit board 212; and a magnet 218 disposed on one surface of the circuit board 212 for alignment.

[0036] In this case, the at least one antenna 214, 216 can perform a specified function in a non-contact manner using a magnetic field of a specified frequency band, and the magnet 218 for alignment can be disposed on a surface of the circuit board 212 in a manner that does not overlap with the at least one antenna 214, 216.

[0037] Furthermore, the at least one antenna 214, 216 can be configured as any one of a wireless power transmission antenna for transmitting wireless power, an NFC antenna for wireless communication, and a magnetically secure transmission (MST) antenna for magnetically secure payments, and can also be configured to include two or more antennas of the wireless power transmission antenna, the NFC antenna, and the MST antenna.

[0038] Meanwhile, the antenna module 200 can be implemented as a wireless power transmission module, NFC module, MST module, etc., depending on the type of the antennas 214 and 216 constituting the antenna units 210, 210', and 210" that constitute the antenna units 210, 210', and 210" respectively.

[0039] The main shielding sheet 110 may be made of a magnetic material to shield the magnetic field generated from the antenna elements 210, 210', 210".

[0040] As an example, the main shielding sheet 110 can be made of a strip of amorphous alloy or nanocrystalline alloy, or it can be made of ferrite sheet or polymer sheet, or it can be made in the form of a combination of the strip, ferrite sheet and polymer sheet.

[0041] Meanwhile, the main shielding sheet 110 can be a multilayer sheet with an adhesive layer as the medium, and the main shielding sheet 110 can also be composed of sheets separated into multiple small pieces, so as to suppress the generation of eddy currents or improve flexibility by increasing the total resistance.

[0042] As a non-restrictive example, such as Figure 2 As shown, the main shielding sheet 110 can be a sheet composed of the strip sheet, ferrite sheet, polymer sheet, etc. in a single layer.

[0043] As an alternative, such as Figure 3 As shown, the main shielding sheet 110 can be composed of strips 111 of amorphous alloy or nanocrystalline alloy, and can be a multilayer sheet in which multiple strips 111 are stacked with an adhesive layer 112 as the medium. Furthermore, each strip 111 constituting the multilayer sheet can be a sheet separated into multiple small pieces.

[0044] However, the material of the main shielding sheet 110 is not limited to this; all known shielding sheets commonly used for shielding magnetic fields are applicable. Furthermore, the main shielding sheet 110 may also include at least one through-hole (not shown), which is formed with a predetermined length or area, so that the main shielding sheet 110 achieves high magnetic permeability while reducing the effects of eddy currents.

[0045] When the antenna elements 210, 210', 210" include magnets 218 for alignment, the anti-magnetic saturation member 120 can prevent magnetic saturation of the main shielding sheet 110 caused by a DC magnetic field by inducing a DC magnetic field generated from the magnets 218.

[0046] For this purpose, the antimagnetic saturation component 120 can be stacked on one surface of the main shield 110 and can be made of a magnetic material in order to induce a DC magnetic field generated from the magnet 218.

[0047] Meanwhile, the antimagnetic saturation member 120 can be configured to have a relatively wider area than the cross-sectional area of ​​the magnet 218.

[0048] As an example, the antimagnetic saturation member 120 may be stacked on a surface of the main shield 110 in such a manner that it is located at a position corresponding to the magnet 218 included in the antenna elements 210, 210', 210" and has a number corresponding one-to-one with the magnet 218 included in the antenna elements 210, 210', 210" and the antimagnetic saturation member 120 may be configured to have an area that is relatively wider than the cross-sectional area of ​​the corresponding magnet 218.

[0049] Specifically, the anti-magnetic saturation member 120 can be disposed between the circuit board 212 constituting the antenna units 210, 210', 210" and the main shielding sheet 110 in a manner that corresponds one-to-one with the magnet 218 disposed on a surface of the circuit board 212.

[0050] In other words, the antimagnetic saturation member 120 and the magnet 218 can be respectively disposed on two surfaces of the circuit board 212 constituting the antenna units 210, 210', and 210"; the antimagnetic saturation member 120 can be stacked on one surface of the main shielding sheet 110 in a manner located directly below the magnet 218; and the antimagnetic saturation member 120 can be configured to have a relatively wider cross-sectional area than the magnet 218.

[0051] Therefore, as Figure 4 and Figure 5 As shown, when the magnetic field shielding sheet 100 according to an embodiment of the present invention, together with the antenna unit 210 including the magnet 218 for alignment, constitutes an antenna module 200, at least a portion of the DC magnetic field generated from the magnet 218 can be stably induced to the side of the antimagnetic saturation member 120, and the DC magnetic field induced by the antimagnetic saturation member 120 can form a closed loop in the antenna module 200 through the magnet 218 and the antimagnetic saturation member 120.

[0052] Therefore, even if a DC magnetic field is generated from the magnet 218, at least a portion of the DC magnetic field generated from the magnet 218 can be induced to the antimagnetic saturation member 120 side, thereby preventing it from moving to the main shielding plate 110 side.

[0053] Therefore, the main shield 110 can prevent magnetic saturation caused by the DC magnetic field generated from the magnet 218, thereby preventing performance degradation due to magnetic saturation.

[0054] At this time, the anti-magnetic saturation member 120 can be made of a material with a saturation magnetic flux density of 1.2 Tesla or higher, so as to prevent saturation caused by the DC magnetic field induced from the magnet 218 while having a thin thickness t2.

[0055] As an example, the antimagnetic saturation member 120 may be composed of a strip 121 of amorphous alloy or nanocrystalline alloy, and may be configured to have a thickness t2 of less than 1 / 2 of the thickness t1 of the main shielding sheet 110.

[0056] Wherein, when the antimagnetic saturation component 120 is composed of amorphous alloy or nanocrystalline alloy strip 121, the antimagnetic saturation component 120 can be composed not only as a single layer of strip 121, but also, as Figure 2 and Figure 3 As shown, the antimagnetic saturation component 120 can also be constructed in the form of multiple layers, wherein the multiple layers are formed by stacking multiple strips 121 with an adhesive layer 122 as the medium. Furthermore, the strips 121 can be formed from multiple separate small pieces.

[0057] Therefore, in the magnetic field shield 100 according to an embodiment of the present invention, even if the anti-magnetic saturation member 120 is stacked on one surface of the main shield 110, the increase in the total thickness of the magnetic field shield 100 can be minimized, and magnetic saturation of the main shield 110 caused by the DC magnetic field generated from the magnet 218 can be prevented.

[0058] However, the material of the antimagnetic saturation component 120 is not limited to this. As long as the saturation magnetic flux density is 1.2 Tesla or above, a variety of known materials can be used without restriction.

[0059] The protective film 130 can be attached to the main shielding sheet 110 in a manner that uses the adhesive layer 133 as a medium and wraps around the exposed surface of the main shielding sheet 110.

[0060] As an example, such as Figures 1 to 3 As shown, the protective film 130 may include a first protective film 131 covering the upper surface of the main shielding sheet 110 and a second protective film 132 covering the lower surface of the main shielding sheet 110.

[0061] At this time, the first protective film 131 can be attached to the upper surface of the main shielding sheet 110 to cover the upper surface of the main shielding sheet 110 and the exposed surface of the antimagnetic saturation member 120 stacked on the upper surface of the main shielding sheet 110.

[0062] Thus, the protective film 130 can prevent the main shielding sheet 110 and the antimagnetic saturation component 120 from being exposed to the outside, so as to avoid external forces.

[0063] Meanwhile, according to an embodiment of the present invention, the magnetic field shielding sheet 100 for the antenna module can simultaneously cover one surface of the main shielding sheet 110 and the antimagnetic saturation member 120 through the first protective film 131, so as to significantly reduce the possibility of the antimagnetic saturation member 120 detaching from the main shielding sheet 110.

[0064] Either the first protective film 131 or the second protective film 132 can be removed, so that when the magnetic field shielding sheet 100 for the antenna module according to an embodiment of the present invention is used together with the antenna units 210, 210', 210" to form an antenna module 200, the adhesive layer 133 can be exposed to the outside and attached to a surface of the antenna units 210, 210', 210".

[0065] As an example, the first protective film 131 can be removed so that when the magnetic field shielding sheet 100 for the antenna module according to an embodiment of the present invention, together with the antenna elements 210, 210', 210" to form the antenna module 200, a surface of the antenna elements 210, 210', 210" can be attached to the upper surface of the main shielding sheet 110.

[0066] Therefore, when the magnetic field shielding sheet 100 for the antenna module according to an embodiment of the present invention, together with the antenna elements 210, 210', 210" to form an antenna module 200, the anti-magnetic saturation member 120 can be configured to be located between a surface of the antenna elements 210, 210', 210" and a surface of the main shielding sheet 110.

[0067] Therefore, even if the first protective film 131 (which is used to cover one surface of both the main shielding sheet 110 and the antimagnetic saturation member 120) is removed, the antimagnetic saturation member 120 is located between one surface of the antenna elements 210, 210', 210" that are attached to each other and the main shielding sheet 110 and is fixed thereto, thus maintaining its original position.

[0068] At this time, the protective film 130 can not only cover the upper and lower surfaces of the main shielding sheet 110 respectively, but also cover all exposed surfaces of the main shielding sheet 110 and the antimagnetic saturation component 120.

[0069] In other words, the protective film 130 can be attached to the main shielding sheet 110 in such a way that it covers the upper and lower surfaces and the side surfaces of the main shielding sheet 110.

[0070] Specifically, such as Figure 2 and Figure 3 As shown, the first protective film 131 can cover part of the upper surface and side surface of the main shielding sheet 110 and the side surface and upper surface of the antimagnetic saturation member 120, and the second protective film 132 can cover the bottom surface of the main shielding sheet 110 and the remaining side surface of the main shielding sheet 110 not covered by the first protective film 131.

[0071] Therefore, according to an embodiment of the present invention, the magnetic field shielding sheet 100 can be configured such that the main shielding sheet 110 and the antimagnetic saturation member 120 are sealed inside the protective film 130.

[0072] Therefore, even if particles or powder fall off from the side surfaces of the main shielding sheet 110 and the antimagnetic saturation member 120, the movement of the fallen particles or powder to other components such as antenna elements 210, 210', and 210" can be prevented from the source.

[0073] Therefore, even if the main shielding sheet 110 and / or the antimagnetic saturation member 120 are made of a material including metallic components, electrical short circuits of antenna elements 210, 210', 210" caused by detached particles or powder can be prevented from the source.

[0074] At the same time, even if the main shielding sheet 110 and / or the antimagnetic saturation member 120 are configured as a sheet formed by a plurality of separate small pieces, it can prevent some of the small pieces from detaching to the outside from the source.

[0075] According to the above embodiment of the present invention, the magnetic field shielding sheet 100 for an antenna module can be implemented together with antenna elements 210, 210', 210" in the form of an antenna module 200, wherein the antenna elements 210, 210', 210" include a wireless power transmission antenna (first antenna 214) for transmitting wireless power.

[0076] As an example, such as Figure 4 and Figure 5 As shown, the antenna module 200 may include an antenna unit 210 and the magnetic field shield 100. The antenna unit 210 includes at least one antenna (a first antenna 214 and / or a second antenna 216) patterned on at least one surface of a circuit board 212; and a magnet 218 for alignment. The magnetic field shield 100 is disposed on one surface of the antenna unit 210.

[0077] The antennas (first antenna 214 and second antenna 216) can be configured as any one of wireless power transmission antenna, NFC antenna and MST antenna, or as a combination of two or more of the wireless power transmission antenna, NFC antenna and MST antenna.

[0078] As an example, such as Figure 4 , Figure 5 and Figure 7 As shown, the antenna units 210, 210" can be configured to include: a first antenna 214 and a second antenna 216 patterned on the circuit board 212; and at least one magnet 218, 218' disposed on a surface of the circuit board 212.

[0079] In this case, the first antenna 214 may be a wireless power transmission antenna, the second antenna 216 may be an NFC antenna, and the second antenna 216 may be formed on the circuit board 212 in a manner that surrounds the periphery of the first antenna 214.

[0080] The wireless power transmission antenna can be either a wireless power receiving antenna that receives wireless power from the wireless power transmitting module, or a wireless power transmitting antenna that transmits wireless power to the wireless power receiving antenna. In other words, in the antenna module 200, when antenna elements 210, 210', and 210" include wireless power transmission antennas, depending on the function of these antennas, the antenna module 200 can function as either a wireless power receiving module or a wireless power transmitting module.

[0081] As another example, such as Figure 6 As shown, the antenna unit 210' can also be configured to include: a first antenna 214 patterned on the circuit board 212; and at least one magnet 218 disposed on a surface of the circuit board 212.

[0082] In this case, the first antenna 214 can perform the function of any one of the following antennas: wireless power transmission antenna, NFC antenna, and MST antenna, and preferably, it can perform the function of wireless power transmission antenna.

[0083] At this time, as described above, the magnetic field shielding sheet 100 can be attached to a surface of the circuit board 212 in such a way that the antimagnetic saturation member 120 is disposed between the circuit board 212 and the main shielding sheet 110.

[0084] Furthermore, in the magnetic field shielding sheet 100, the anti-magnetic saturation member 120 can be configured to correspond one-to-one with at least one magnet 218 disposed on a surface of the circuit board 212.

[0085] In other words, the anti-magnetic saturation component 120 and the magnet 218 can be respectively disposed on two surfaces of the circuit board 212 constituting the antenna units 210, 210', and 210" and the anti-magnetic saturation component 120 can be disposed directly below the magnet 218 and the anti-magnetic saturation component 120 can be disposed with a relatively wider cross-sectional area than the magnet 218.

[0086] Therefore, at least a portion of the DC magnetic field generated from the magnet 218 can be stably induced to the antimagnetic saturation member 120 side, and the DC magnetic field induced by the antimagnetic saturation member 120 can form a closed loop within the antenna module 200 through the magnet 218 and the antimagnetic saturation member 120.

[0087] Therefore, even if a DC magnetic field is generated in the magnet 218, at least a portion of the DC magnetic field generated from the magnet 218 can be induced to the antimagnetic saturation member 120 side, thereby preventing it from moving to the main shielding plate 110 side.

[0088] Therefore, the main shield 110 can prevent magnetic saturation caused by the DC magnetic field generated from the magnet 218, thereby preventing performance degradation due to magnetic saturation.

[0089] On the other hand, in an antenna module 200 according to an embodiment of the present invention, at least one magnet 218' included in the antenna unit 210" can also be configured as a pair of magnets 218' with different polarities.

[0090] In other words, such as Figure 7 As shown, the antenna unit 210" may include at least one antenna 214, 216 patterned on the circuit board 212, and magnets 218" disposed on a surface of the circuit board 212 at a position corresponding to the antimagnetic saturation member 120 may be configured as a pair with different polarities.

[0091] As an example, in Figure 7 In this context, the pair of magnets 218' with different polarities can be a first magnet 218a with the N pole facing upward and a second magnet 218b with the S pole facing upward.

[0092] Therefore, when the antenna module 200 according to an embodiment of the present invention is aligned with another antenna module (including a magnet for alignment), regardless of the polarity of the magnet for alignment provided in the other antenna module, the antenna module 200 according to an embodiment of the present invention can stably align with the other antenna module using either a first magnet 218a or a second magnet 218b with different polarities.

[0093] Although one embodiment of the present invention has been described above, the concept of the present invention is not limited to the embodiment shown in this specification. Those skilled in the art who understand the concept of the present invention can easily propose other embodiments by adding, changing, deleting, or adding elements within the same scope of the concept, and these also fall within the scope of the present invention.

Claims

1. A magnetic field shielding sheet for an antenna module, suitable for an antenna module comprising an antenna patterned on at least one surface of a circuit board, and a plurality of magnets disposed on the surface of the circuit board in a manner that does not overlap with the antenna and for alignment purposes, wherein, The magnetic field shielding sheet for the antenna module includes: The main shielding plate, made of magnetic material, is capable of shielding the magnetic field generated from the antenna element, and Multiple antimagnetic saturation components, each made of a material having a saturation magnetic flux density of 1.2 Tesla or higher, are stacked on one surface of the main shielding sheet to induce a DC magnetic field generated from the multiple magnets, thereby preventing magnetic saturation of the main shielding sheet; The plurality of antimagnetic saturation components have a number corresponding to the plurality of magnets. The plurality of antimagnetic saturation components are respectively disposed on one surface of the main shielding sheet so as to be located at positions corresponding one-to-one with the plurality of magnets, and Each of the plurality of antimagnetic saturation components has a cross-sectional area that is relatively wider than that of the corresponding magnet.

2. The magnetic field shielding sheet for an antenna module according to claim 1, wherein, The thickness of the antimagnetic saturation member is configured to be less than 1 / 2 of the thickness of the main shielding sheet.

3. The magnetic field shielding sheet for an antenna module according to claim 1, wherein, The antimagnetic saturation component is a strip of amorphous alloy or nanocrystalline alloy.

4. The magnetic field shielding sheet for an antenna module according to claim 3, wherein, The antimagnetic saturation component is a multilayer sheet composed of multiple layers of the strip sheet.

5. The magnetic field shielding sheet for an antenna module according to claim 1, wherein, The magnetic field shielding sheet for the antenna module further includes: a first protective film and a second protective film attached to the main shielding sheet in a manner that covers the exposed surface of the main shielding sheet; Either the first protective film or the second protective film is attached to the main shielding sheet in such a way that it covers one surface of the main shielding sheet and the exposed surface of the antimagnetic saturation member stacked on one surface of the main shielding sheet.

6. An antenna module, wherein, The antenna module includes: An antenna unit includes a circuit board, an antenna patterned on at least one surface of the circuit board, and a plurality of magnets disposed on one surface of the circuit board in a manner that does not overlap with the antenna and for alignment purposes; and A magnetic field shielding sheet is disposed on a surface of the antenna element in a manner capable of shielding the magnetic field generated from the antenna. The magnetic field shielding sheet is the magnetic field shielding sheet for an antenna module as described in any one of claims 1 to 5.

7. The antenna module according to claim 6, wherein, The antenna includes one or more of the following: wireless power transmission antenna, short-range wireless communication antenna, and magnetically secure transmission antenna.

8. The antenna module according to claim 6, wherein, The magnetic field shielding sheet is attached to a surface of the circuit board in such a way that the antimagnetic saturation member is disposed between the circuit board and the main shielding sheet.

9. The antenna module according to claim 6, wherein, At the location corresponding to the antimagnetic saturation member, the magnets can be configured as a pair with different polarities.

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