Composite ferrite magnetic field shielding sheet, method for manufacturing same, and antenna module using same
AssigneeEmw Co., Ltd.
InventorsWon Mo SEONG, In Seung BAEK
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Abstract
A composite ferrite magnetic field shielding sheet is divided into at least two regions. The at least two regions have different properties by adjusting raw ferrite particles suitable for forming at least two functional coil patterns from among wireless power charging (WPC), near field wireless communication (NFC), and magnetic security transmission (MST) coil patterns.
Claims21
A composite ferrite magnetic field shielding sheet in which two or more functional coil patterns are formed, the sheet comprising:
- a first magnetic sheet including a first region in which a first coil pattern is formed;
- and
- a second magnetic sheet including a second region in which a second coil pattern is formed,
- wherein a resonance frequency according to the first coil pattern is lower than a resonance frequency according to the second coil pattern, and magnetic permeability of the first region is higher than that of the second region, and
- wherein the first magnetic sheet and the second magnetic sheet are ferrite sheets, and shapes of ferrite particles which are raw materials of the magnetic sheet and the second magnetic sheet are different.
A method of manufacturing a composite ferrite magnetic field shielding sheet in which two or more functional coil patterns are formed, the method comprising:
- (a) manufacturing a first green sheet and a second green sheet in order to manufacture a first magnetic sheet including a first region in which a first coil pattern is formed and a second magnetic sheet including a second region in which a second coil pattern is formed;
- and
- (b) simultaneously sintering the first green sheet and the second green sheet to manufacture a composite ferrite magnetic field shielding sheet in which the first magnetic sheet and the second magnetic sheet are coupled,
- wherein a resonance frequency according to the first coil pattern is lower than a resonance frequency according to the second coil pattern, and a magnetic permeability of the first region is higher than that of the second region, and
- wherein the first magnetic sheet and the second magnetic sheet are ferrite sheets, and shapes of ferrite particles which are raw materials of the magnetic sheet and the second magnetic sheet are different.
Dependencies are inferred from the claim text.