Wireless device having electromagnetic shielding

Abstract

A wireless device having electromagnetic shielding for a coil includes a composite magnetic sheet. The composite magnetic sheet includes first and second magnetic sheet parts. The first magnetic sheet part has a stacked structure of magnetic sheets including a surface which is an outermost surface of the first magnetic sheet part. The second magnetic sheet part is disposed on the outermost surface of the first magnetic sheet part. At least one magnetic sheet of the first magnetic sheet part includes a cracked structure and the second magnetic sheet part does not include a cracked structure. A protective member is disposed above the composite magnetic sheet. A coil is disposed below the composite magnetic sheet. A magnetic sheet of the first magnetic sheet part with a cracked structure has a surface roughness or porosity greater than that of the second magnetic sheet part without a cracked structure.

1 - 10 . (canceled) 
     
     
         11 . A wireless device having electromagnetic shielding comprising:
 a composite magnetic sheet; and   a coil coupled to the composite magnetic sheet,   wherein the composite magnetic sheet includes:
 a first magnetic sheet part having a stacked structure of two or more magnetic sheets including a surface on one of the magnetic sheets which is an outermost surface of the first magnetic sheet part, and 
 a second magnetic sheet part disposed on the outermost surface of the first magnetic sheet part, 
   wherein at least one magnetic sheet of the first magnetic sheet part includes a cracked structure and the second magnetic sheet part does not include a cracked structure.   
     
     
         12 . The wireless device of  claim 11 , wherein the composite magnetic sheet includes an upper portion and further comprising a protective member disposed on the upper portion of the composite magnetic sheet. 
     
     
         13 . The wireless device of  claim 12 , wherein at least one magnetic sheet of the first magnetic sheet part with a cracked structure has a porosity greater than the porosity of the second magnetic sheet part without a cracked structure. 
     
     
         14 . The wireless device of  claim 12 , wherein at least one magnetic sheet of the first magnetic sheet part with a cracked structure has a surface roughness greater than the surface roughness of the second magnetic sheet part without a cracked structure. 
     
     
         15 . The wireless device of  claim 12 , wherein all magnetic sheets of the first magnetic sheet part have a cracked structure. 
     
     
         16 . The wireless device of  claim 12 , wherein the coil is disposed on the first magnetic sheet part, and the first magnetic sheet part is disposed between the coil and the second magnetic sheet part. 
     
     
         17 . The wireless device of  claim 11 , wherein the second magnetic sheet part includes a magnetic sheet having a same material as the two or more magnetic sheets in the first magnetic sheet part. 
     
     
         18 . The wireless device of  claim 11 , further comprising adhesive members disposed between magnetic sheets of the first magnetic sheet part and between the first magnetic sheet part and the second magnetic sheet part. 
     
     
         19 . The wireless device of  claim 11 , wherein a volume of the first magnetic sheet part is in a range of 70% to 80% of a volume of the composite magnetic sheet. 
     
     
         20 . The wireless device of  claim 11 , wherein a thickness of at least one magnetic sheet of the first magnetic sheet part is 18 μm to 200 μm. 
     
     
         21 . The wireless device of  claim 11 , wherein an air gap is provided between at least two magnetic sheets of the first magnetic sheet part, the air gap having a volume between 1% to 5% of a volume of the composite magnetic sheet. 
     
     
         22 . A wireless device having protective electromagnetic shielding comprising:
 a protective member;   a coil; and   a composite magnetic sheet arranged between the protective member and the coil;   wherein the composite magnetic sheet includes:
 a first magnetic sheet part having a stacked structure of two or more magnetic sheets including a surface on one of the magnetic sheets which is an outermost surface of the first magnetic sheet part, and 
 a second magnetic sheet part disposed above the outermost surface of the first magnetic sheet part and below the protective member, 
   wherein at least one magnetic sheet of the first magnetic sheet part includes a cracked structure and the second magnetic sheet part does not include a cracked structure;   wherein at least one magnetic sheet of the first magnetic sheet part with a cracked structure has a porosity greater than the porosity of the second magnetic sheet part without a cracked structure; and   wherein at least one magnetic sheet of the first magnetic sheet part with a cracked structure has a surface roughness greater than the surface roughness of the second magnetic sheet part without a cracked structure.   
     
     
         23 . The wireless device of  claim 22 , wherein all magnetic sheets of the first magnetic sheet part have a cracked structure. 
     
     
         24 . The wireless device of  claim 22 , wherein the coil is disposed on the first magnetic sheet part, and the first magnetic sheet part is disposed between the coil and the second magnetic sheet part. 
     
     
         25 . The wireless device of  claim 22 , wherein the second magnetic sheet part includes a magnetic sheet having a same material as the two or more magnetic sheets in the first magnetic sheet part. 
     
     
         26 . The wireless device of  claim 22 , further comprising adhesive members disposed between magnetic sheets of the first magnetic sheet part and between the first magnetic sheet part and the second magnetic sheet part. 
     
     
         27 . The wireless device of  claim 22 , wherein a volume of the first magnetic sheet part is in a range of 70% to 80% of a volume of the composite magnetic sheet. 
     
     
         28 . The wireless device of  claim 22 , wherein a thickness of at least one magnetic sheet of the first magnetic sheet part is 18 μm to 200 μm. 
     
     
         29 . The wireless device of  claim 22 , wherein an air gap is provided between at least two magnetic sheets of the first magnetic sheet part, the air gap having a volume between 1% to 5% of a volume of the composite magnetic sheet.