Flexible printed circuit board with near-field communication (NFC) coil integration
A flexible printed circuit board includes a coil for near-field communication (NFC) and circuit components for performing other functions such as driving a display panel. By integrating the NFC coil into the flexible printed circuit board, the number of components in an electronic device may be reduced. A ferrite sheet is provided below the NFC coil to enhance the performance of NFC signal reception and transmission. A conductive layer is provided below the ferrite sheet to prevent interference with circuits on a printed circuit board below the flexible printed circuit board.
1 . A flexible printed circuit board in an electronic device, the flexible printed circuit board comprising:
a conductive coil in a first region of a body of the flexible printed circuit board, the conductive coil configured to receive or send data via near-field communication (NFC);
one or more circuit components in a second region of the flexible printed circuit board;
a ferrite sheet on a side of the flexible printed circuit board opposing a first surface, wherein the ferrite sheet overlaps the first region including the conductive coil; and
an insulating layer disposed between the conductive coil and the ferrite sheet, the insulating layer being positioned adjacent a conductive bridge such that the insulating layer contacts at least a portion of the conductive bridge, the insulating layer configured to secure the ferrite sheet to a portion of the body of the flexible printed circuit board.
2 . The flexible printed circuit board of claim 1 , wherein the one or more circuit components are electrically connected to a display circuit board for operating a display panel.
3 . The flexible printed circuit board of claim 2 ,
wherein the one or more circuit components comprise capacitors in the second region.
4 . The flexible printed circuit board of claim 1 , further comprising a first conductive layer extending at least under the ferrite sheet.
5 . The flexible printed circuit board of claim 4 , wherein the first conductive layer comprises a copper film.
6 . The flexible printed circuit board of claim 5 , further comprising an adhesive layer between the copper film to secure the copper film to the first region.
7 . The flexible printed circuit board of claim 4 , further comprising a second conductive layer below the second region, and a conductive bridge between the first conductive layer and the second conductive layer.
8 . The flexible printed circuit board of claim 1 , further comprising a socket configured to receive a connector to another printed circuit board, the socket connected to at least one of the conductive coil or the one or more circuit components.
9 . A portable electronic device, comprising: a flexible printed circuit board comprising:
a conductive coil in a first region of a body of the flexible printed circuit board, the conductive coil configured to receive or send data via near-field communication (NFC), one or more circuit components in a second region of the flexible printed circuit board;
a ferrite sheet on a side of the flexible printed circuit board opposing a first surface, wherein the ferrite sheet overlaps the first region including the conductive coil; and
an insulating layer disposed between the conductive coil and the ferrite sheet, the insulating layer being positioned adjacent a conductive bridge such that the insulating layer contacts at least a portion of the conductive bridge, the insulating layer being configured to secure the ferrite sheet to a portion of the body the flexible printed circuit board;
a first printed circuit board comprising a first circuit coupled to the one or more circuit components to perform a function of the portable electronic device; and
a second printed circuit board comprising a second circuit coupled to the conductive coil to process a wireless signal received or sent via the conductive coil.
10 . The portable electronic device of claim 9 , further comprising a display panel that is operated by the first circuit and the one or more circuit components.
11 . The portable electronic device of claim 10 , wherein the one or more circuit components comprise capacitors in the second region.
12 . The portable electronic device of claim 9 , wherein the flexible printed circuit board further comprises a first conductive layer extending at least under the ferrite sheet.
13 . The portable electronic device of claim 12 , wherein the first conductive layer comprises a copper film.
14 . The portable electronic device of claim 13 , wherein the flexible printed circuit board further comprises an adhesive layer between the copper film to secure the copper film to the first region.
15 . The portable electronic device of claim 12 , wherein the flexible printed circuit board further comprises a second conductive layer below the second region, and a conductive bridge between the first conductive layer and the second conductive layer.
16 . The portable electronic device of claim 12 , wherein the flexible printed circuit board further comprises a socket configured to receive a connector to another printed circuit board, the socket connected to at least one of the conductive coil or the one or more circuit components.
17 . The portable electronic device of claim 9 , further comprising a fabric over foam gasket between the flexible printed circuit board and the second printed circuit board.
18 . The flexible printed circuit board of claim 1 , wherein
the portion of the body corresponds to a bottom side of the body.
19 . The portable electronic device of claim 9 , wherein
the portion of the body corresponds to a bottom side of the body.