# US 12,191,565 B2 · Magnetic shielding sheet for antenna module and antenna module including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,565 B2 - Document ID: US12191565B2 - Status: Granted - Kind: B2 - Application number: 18/250,956 - Filed: 2021-10-22 - Published: 2023-12-21 - Granted: 2025-01-07 - Earliest claimed: 2020-10-28 - Assignees: Amosense Co., Ltd. - Applicants: Amosense Co., Ltd - Inventors: Kil Jae Jang - Web page: https://patentgrep.com/patent/US12191565B2 ## CPC - H01Q 1/526: {Electromagnetic shields} - H04B 5/79: for data transfer in combination with power transfer - H04B 5/24: Inductive coupling - H04B 5/263: {Multiple coils at either side} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H04B: TRANSMISSION ## Abstract Disclosed is an magnetic field shielding sheet for an antenna module is applied to an antenna module comprising an antenna unit operating in a predetermined frequency band and a magnet for position alignment, and comprises: a main shielding sheet made of a magnetic material so as to be able to shield a magnetic field generated from the antenna unit; and at least one magnetic saturation-prevention member stacked on one side of the main shielding sheet so as to be able to prevent magnetic saturation of the main shielding sheet by inducing a direct magnetic field generated from the magnet, wherein the magnetic saturation-prevention member is provided in a number corresponding to the number of magnets provided in the antenna module and is positioned on one side of the main shielding sheet so as to be positioned at a position corresponding to the magnets provided in the antenna module. ## Claims ### Claim 1 A magnetic field shielding sheet for an antenna module which is applied to an antenna module comprising an antenna unit operating in a predetermined frequency band and a magnet for position alignment, comprising: a main shielding sheet made of a magnetic material so as to shield a magnetic field generated from the antenna unit; and at least one magnetic saturation-prevention member which is stacked on one side of the main shielding sheet so as to prevent magnetic saturation of the main shielding sheet by inducing a direct magnetic field generated from the magnet, wherein the magnetic saturation-prevention member is provided in a number corresponding to the number of magnets provided in the antenna module and is disposed on one surface of the main shielding sheet so as to be positioned at a position corresponding to the magnets provided in the antenna module. ### Claim 2 (depends on 1) The magnetic field shielding sheet of claim 1, wherein the magnetic saturation-prevention member is provided to have a cross-sectional area which is larger than the cross-sectional area of the magnet. ### Claim 3 (depends on 1) The magnetic field shielding sheet of claim 1, wherein the thickness of the magnetic saturation-prevention member is provided to have a thickness of ½ or less with respect to the thickness of the main shielding sheet. ### Claim 4 (depends on 1) The magnetic field shielding sheet of claim 1, wherein the magnetic saturation-prevention member is made of a material having a saturation magnetic flux density of 1.2 Tesla or more. ### Claim 5 (depends on 4) The magnetic field shielding sheet of claim 4, wherein the magnetic saturation-prevention member is a ribbon sheet of an amorphous alloy or a nano-crystalline alloy. ### Claim 6 (depends on 5) The magnetic field shielding sheet of claim 5, wherein the magnetic saturation-prevention member is a multi-layer sheet in which the ribbon sheet is stacked in multiple layers. ### Claim 7 (depends on 1) The magnetic field shielding sheet of claim 1, wherein the magnetic field shielding sheet for an antenna module further comprises a first protective film and a second protective film which are attached to the main shielding sheet so as to surround an exposed surface of the main shielding sheet, and wherein any one of the first protective film and the second protective film is attached to the main shielding sheet so as to surround one surface of the main shielding sheet and an exposed surface of the magnetic saturation-prevention member which is laminated on one surface of the main shielding sheet. ### Claim 8 An antenna module, comprising: an antenna unit comprising a circuit board, at least one antenna which is formed in a pattern on at least one surface of the circuit board and at least one magnet which is disposed on one surface of the circuit board; and a magnetic field shielding sheet which is disposed on one surface of the antenna unit so as to shield a magnetic field generated from the at least one antenna, wherein the magnetic field shielding sheet, comprising: a main shielding sheet made of a magnetic material so as to shield a magnetic field generated from the antenna unit; and at least one magnetic saturation-prevention member which is stacked on one side of the main shielding sheet so as to prevent magnetic saturation of the main shielding sheet by inducing a direct magnetic field generated from the magnet, wherein the magnetic saturation-prevention member is provided in a number corresponding to the number of magnets provided in the antenna module and is disposed on one surface of the main shielding sheet so as to be positioned at a position corresponding to the magnets provided in the antenna module. ### Claim 9 (depends on 8) The antenna module of claim 8, wherein the antenna comprises at least one of an antenna for wireless power transfer, an NFC antenna and an MST antenna. ### Claim 10 (depends on 8) The antenna module of claim 8, wherein the magnetic field shielding sheet is attached to one surface of the circuit board such that the magnetic saturation-prevention member is disposed between the circuit board and the main shielding sheet. ### Claim 11 (depends on 8) The antenna module of claim 8, wherein the magnet is provided in a pair to have different polarities at positions corresponding to the magnetic saturation-prevention member. ### Claim 12 (depends on 8) The antenna module of claim 8, wherein the magnetic saturation-prevention member is provided to have a cross-sectional area which is larger than the cross-sectional area of the magnet. ### Claim 13 (depends on 8) The antenna module of claim 8, wherein the thickness of the magnetic saturation-prevention member is provided to have a thickness of ½ or less with respect to the thickness of the main shielding sheet. ### Claim 14 (depends on 8) The antenna module of claim 8, wherein the magnetic saturation-prevention member is made of a material having a saturation magnetic flux density of 1.2 Tesla or more. ### Claim 15 (depends on 14) The antenna module of claim 14, wherein the magnetic saturation-prevention member is a ribbon sheet of an amorphous alloy or a nano-crystalline alloy. ### Claim 16 (depends on 15) The antenna module of claim 15, wherein the magnetic saturation-prevention member is a multi-layer sheet in which the ribbon sheet is stacked in multiple layers. ### Claim 17 (depends on 8) The antenna module of claim 8, wherein the magnetic field shielding sheet for an antenna module further comprises a first protective film and a second protective film which are attached to the main shielding sheet so as to surround an exposed surface of the main shielding sheet, and wherein any one of the first protective film and the second protective film is attached to the main shielding sheet so as to surround one surface of the main shielding sheet and an exposed surface of the magnetic saturation-prevention member which is laminated on one surface of the main shielding sheet.