Receiving antenna and wireless power receiving device including the same
A receiving antenna of a wireless power receiving device wirelessly charging electric power according to an embodiment of the present invention includes a substrate, a soft magnetic layer stacked on the substrate, and a receiving coil configured to receive electromagnetic energy emitted from a wireless power transmission device, wound in parallel with a plane of the soft magnetic layer, and formed inside of the soft magnetic layer, and an insulating layer is formed between the soft magnetic layer and the receiving coil.
1. A wireless power receiving antenna comprising:
a substrate;
a soft magnetic layer comprising a first magnetic sheet disposed on the substrate and a second magnetic sheet disposed on the first magnetic sheet;
a receiving coil disposed on the second magnetic sheet; and
an adhesive layer formed between the second magnetic sheet and the receiving coil,
wherein the adhesive layer includes a first adhesive layer in contact with the second magnetic sheet, a second adhesive layer in contact with the receiving coil, and an insulating layer disposed between the first adhesive layer and the second adhesive layer, and
wherein a height of a highest position of the second magnetic sheet from the substrate is higher than a height of a lowest position of the receiving coil from the substrate.
2. The wireless power receiving antenna of claim 1 , wherein the soft magnetic layer includes an Fe—Si based alloy.
3. The wireless power receiving antenna of claim 2 , further comprising a support means stacked on the receiving coil.
4. The wireless power receiving antenna of claim 3 , further comprising an NFC coil disposed so as to surround a side portion of the receiving coil.
5. The wireless power receiving antenna of claim 4 , wherein the insulating layer includes a polyethylene terephthalate (PET).
6. The wireless power receiving antenna of claim 4 , wherein the insulating layer includes a polyimide (PI).
7. The wireless power receiving antenna of claim 4 , wherein a portion of the receiving coil is embedded in a portion of the second magnetic sheet.
8. The wireless power receiving antenna of claim 4 , wherein a portion of a side of the soft magnetic layer on which the NFC coil is disposed is removed.
9. The wireless power receiving antenna of claim 1 , wherein at least one of the first magnetic sheet or the second magnetic sheet includes an Fe—Si based soft magnetic metal powder and a polymer resin.
10. A method of fabricating a wireless power receiving antenna, the method comprising:
preparing a substrate;
disposing a first soft magnetic sheet including a Fe—Si based alloy on the substrate;
stacking a plurality of the soft magnetic sheets by stacking a second soft magnetic sheet including the Fe—Si based alloy on the first soft magnetic sheet;
disposing an adhesive layer on the second soft magnetic sheet;
disposing a receiving coil on the adhesive layer; and
compressing the plurality of the soft magnetic sheets, the adhesive layer, and the receiving coil,
wherein the adhesive layer includes a first adhesive layer in contact with the second soft magnetic sheet, a second adhesive layer in contact with the receiving coil, and an insulating layer disposed between the first adhesive layer and the second adhesive layer, and
wherein compressing the plurality of the soft magnetic sheets, the adhesive layer, and the receiving coil includes forming a height of a highest position of the second magnetic sheet from the substrate so to be higher than a height of a lowest position of the receiving coil from the substrate.
11. The method of fabricating a wireless power receiving antenna of claim 10 , further comprising stacking a support means on the receiving coil.
12. The method of fabricating a wireless power receiving antenna of claim 10 , further disposing an NFC coil to surround a side portion of the receiving coil.
13. The method of fabricating a wireless power receiving antenna of claim 12 , wherein a portion of a side of the plurality of the soft magnetic sheets on which the NFC coil is disposed is removed.
14. The method of fabricating a wireless power receiving antenna of claim 10 , wherein compressing the plurality of the soft magnetic sheets, the adhesive layer, and the receiving coil includes simultaneously compressing the plurality of the soft magnetic sheets, the adhesive layer, and the receiving coil by heating.
15. The method of fabricating a wireless power receiving antenna of claim 14 , wherein the insulating layer includes a polyethylene terephthalate (PET).
16. The method of fabricating a wireless power receiving antenna of claim 14 , wherein a portion of the receiving coil is formed to be embedded in a portion of the second magnetic sheet.
17. The method of fabricating a wireless power receiving antenna of claim 10 , wherein at least one of the first soft magnetic sheet and the second soft magnetic sheet includes an Fe—Si based soft magnetic metal powder and a polymer resin.
18. A wireless power receiving apparatus comprising a receiving circuit and a wireless power receiving antenna, the wireless power receiving antenna comprising:
a substrate;
a soft magnetic layer comprising a first magnetic sheet disposed on the substrate and a second magnetic sheet disposed on the first magnetic sheet;
a receiving coil disposed on the second magnetic sheet, and
an adhesive layer formed between the second magnetic sheet and the receiving coil;
wherein the adhesive layer includes a first adhesive layer in contact with the second magnetic sheet, a second adhesive layer in contact with the receiving coil, and an insulating layer disposed between the first adhesive layer and the second adhesive layer, and
wherein a height of a highest position of the second magnetic sheet from the substrate is higher than a height of a lowest position of the receiving coil from the substrate.
19. The wireless power receiving apparatus of claim 18 , further comprising a NFC coil disposed to surround a side portion of the receiving coil.