Flexible printed circuit board and mobile terminal comprising same

Patent metadata

Field	Value
Publication number	US-11089677-B2
Application number	US-201816979448-A
Country	US
Kind code	B2
Filing date	May 17, 2018
Priority date	Apr 9, 2018
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A mobile terminal includes a case; a circuit board disposed inside the case; a flexible printed circuit board electrically connected to the circuit board, and having insulating layers and conductive layers stacked in an alternating manner; a first antenna disposed on a first region of the flexible printed circuit board and facing an end surface of the case and configured to transmit radio signals in a direction toward the end surface of the case; a plurality of microstrip lines disposed on a bent second region of the flexible printed circuit board at a side portion of the first region; and a copper clad laminate stacked second antenna disposed on a third region of the flexible printed circuit board positioned on another side portion of the second region and configured to transmit radio signals in a direction toward a side surface of the case.

First claim

The invention claimed is:

1. A mobile terminal comprising:
a case;
a circuit board disposed inside the case;
a flexible printed circuit board electrically connected to the circuit board, and having insulating layers and conductive layers stacked in an alternating manner;
a first antenna disposed on a first region of the flexible printed circuit board and facing an end surface of the case and configured to transmit radio signals in a direction toward the end surface of the case;
a plurality of microstrip lines disposed on a bent second region of the flexible printed circuit board at a side portion of the first region; and
a copper clad laminate stacked second antenna disposed on a third region of the flexible printed circuit board positioned on another side portion of the second region and configured to transmit radio signals in a direction toward a side surface of the case;
wherein the flexible printed circuit board includes a plurality of through holes in the first region and the third region, and
wherein the microstrip lines are disposed on an outermost conductive layer of the flexible printed circuit board.

2. The mobile terminal of claim 1 , wherein the second antenna comprises an array antenna disposed on an outer surface of the third region.

3. The mobile terminal of claim 1 , wherein the second region includes a conductive signal layer on a conductive ground layer.

4. The mobile terminal of claim 1 , further comprising:
a connector installed on one side of the first region to be connected to the circuit board.

5. The mobile terminal of claim 4 , wherein the connector includes a first connector mounted on a lower surface of the first region, and a second connector inserted into the first connector and mounted on the circuit board.

6. The mobile terminal of claim 1 , further comprising:
a ground layer on a lower end surface of the flexible printed circuit board; and
a shielding sheet coupled to a lower surface of the ground layer.

7. The mobile terminal of claim 1 , further comprising:
a ground layer on a lower end surface of the flexible printed circuit board; and
a cover layer on a lower surface of the ground layer to prevent oxidation.

8. The mobile terminal of claim 7 , wherein the cover layer covers a lower end portion of the second region.

9. The mobile terminal of claim 1 , wherein the radio signals transmitted by the first antenna are substantially perpendicular to the radio signals transmitted by the second antenna.

10. The mobile terminal of claim 1 , further comprising:
a wireless communication module configured to process the radio signals and being mounted on any one side of the first region.

11. The mobile terminal of claim 1 , wherein the end surface of the case is a top end surface or a bottom end surface such that the end surface and the side surface of the case are substantially perpendicular to each other.

12. A flexible printed circuit board located inside a mobile terminal, the flexible printed circuit board comprising:
a plurality of insulating layer and conductive layers stacked in an alternating manner;
a first region including a first antenna disposed thereon, the first antenna facing an end surface of the mobile terminal and configured to transmit radio signals in a direction toward the end surface of the mobile terminal;
a bent second region at a side portion of the first region, and including a plurality of microstrip lines; and
a third region positioned on an opposite side of the first region with respect to the second region, and having a copper clad laminate stacked second antenna to transmit radio signals in a direction toward a side surface of the mobile terminal,
wherein the flexible printed circuit board includes a plurality of through holes in the first region and the third region, and
wherein the microstrip lines are disposed on an outermost conductive layer of the flexible printed circuit board.

13. The flexible printed circuit board of claim 12 , wherein the second antenna comprises an array antenna on an outer surface of the third region.

14. The flexible printed circuit board of claim 12 , further comprising:
a ground layer formed on a lower end surface of the flexible printed circuit board; and
a shielding sheet coupled to a lower surface of the ground layer.

15. The flexible printed circuit board of claim 12 , further comprising:
a ground layer formed on a lower end surface of the flexible printed circuit board; and
a cover layer formed on a lower surface of the ground layer to prevent oxidation.

16. The flexible printed circuit board of claim 12 , wherein the end surface of the mobile terminal is a top end surface or a bottom end surface such that the end surface and the side surface of the mobile terminal are substantially perpendicular to each other.

17. The flexible printed circuit board of claim 12 , further comprising:
a wireless communication module configured to process the radio signals and being mounted on any one side of the first region.

Assignees

• Lg Electronics Inc

Inventors

• Ryu Seungwoo
• Lee Joohee
• Jung Junyoung
• Park Sangjo
• Lee Youngjik
• Lee Jaewon

Classifications

• H05K2201/046

  Planar parts of folded PCBs making an angle relative to each other · CPC title

• H01Q21/08

  the units being spaced along or adjacent to a rectilinear path {(waveguide fed H01Q21/0037)} · CPC title

• H05K2201/10098

  Components for radio transmission, e.g. radio frequency identification [RFID] tag, printed or non-printed antennas · CPC title

• H05K2201/0715

  provided by an outer layer of PCB · CPC title

• H05K1/025

  Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance (H05K1/024 and H05K1/0243 take precedence; for semiconductor devices H10W44/20) · CPC title