MOBILE DEVICE AND MANUFACTURING METHOD THEREOF

• US 20150380820A1
• Filed: 06/26/2014
• Published: 12/31/2015
• Est. Priority Date: 06/26/2014
• Status: Active Grant

• Current Assignee: HTC Corporation
• Original Assignee: HTC Corporation
• Inventors: KUO, Yen-Liang, CHEN, Chien-Chih, WU, Chun-Yih
• Granted Patent: US 9,680,223 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 5/392 the parasitic elements having dual-band or multi-band characteristics
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A mobile device includes a ground plane, a first radiation branch, and a second radiation branch. The second radiation branch is coupled to the ground plane, and is disposed adjacent to the first radiation branch. An antenna structure is formed by the first radiation branch and the second radiation branch. The first radiation branch is fed from a signal source. The second radiation branch is excited by the first radiation branch through coupling therebetween.

Claims

1. A mobile device, comprising:

aground plane;

a first radiation branch; and

a second radiation branch, coupled to the ground plane, and disposed adjacent to the first radiation branch;

wherein an antenna structure is formed by the first radiation branch and the second radiation branch, the first radiation branch is fed from a signal source, and the second radiation branch is excited by the first radiation branch through coupling therebetween.

2. The mobile device as claimed in claim 1, further comprising:

a metal back cover, disposed opposite to the ground plane; and

one or more shorting pins, wherein the metal back cover is coupled through the shorting pins to the ground plane.

3. The mobile device as claimed in claim 2, wherein the metal back cover comprises two separate portions, and at least one opening is formed between the portions of the metal back cover.

4. The mobile device as claimed in claim 3, wherein the opening substantially has a rectangular shape, and the opening is used to accommodate a camera lens, an NFC (Near Field Communication) coil, a flash light module, a biometric identification module, or a wireless charging coil.

5. The mobile device as claimed in claim 1, further comprising:

a first circuit element, embedded in the first radiation branch.

6. The mobile device as claimed in claim 5, wherein the first circuit element comprises a capacitor and a first inductor, and the capacitor is coupled in parallel to the first inductor.

7. The mobile device as claimed in claim 6, wherein the capacitor is a variable capacitor.

8. The mobile device as claimed in claim 1, further comprising:

a second circuit element, wherein one end of the second radiation branch is coupled through the second circuit element to the ground plane.

9. The mobile device as claimed in claim 8, wherein the second circuit element comprises a second inductor.

10. The mobile device as claimed in claim 1, wherein the first radiation branch substantially has an L-shape.

11. The mobile device as claimed in claim 1, wherein the second radiation branch substantially has an L-shape.

12. The mobile device as claimed in claim 1, wherein a width of a coupling gap between the first radiation branch and the second radiation branch is shorter than 6 mm.

13. The mobile device as claimed in claim 1, wherein the ground plane is disposed on a PCB (Printed Circuit Board), or is implemented with a display-carrying element.

14. The mobile device as claimed in claim 1, wherein the ground plane substantially has a rectangular shape with a narrow and long concave region, and the narrow and long concave region is a metal-free region adjacent to the second radiation branch.

15. The mobile device as claimed in claim 14, wherein at least one portion of the second radiation branch is disposed within the narrow and long concave region.

16. The mobile device as claimed in claim 14, further comprising:

a second circuit element, wherein one end of the second radiation branch is coupled through the second circuit element to the ground plane, and spacing between a short edge of the narrow and long concave region and the end of the second radiation branch is at least 3 mm.

17. The mobile device as claimed in claim 1, wherein the first radiation branch is disposed on a first plane, the second radiation branch is disposed on a second plane and a third plane, and the second plane and the third plane are both perpendicular to the first plane.

18. The mobile device as claimed in claim 1, wherein the first radiation branch is disposed on a PCB (Printed Circuit Board).

19. The mobile device as claimed in claim 1, wherein at least one portion of the second radiation branch is implemented with a side appearance element.

20. The mobile device as claimed in claim 19, wherein the side appearance element is an extension portion of a display-carrying element.

21. The mobile device as claimed in claim 19, wherein the side appearance element is an extension portion of a metal back cover.

22. The mobile device as claimed in claim 1, wherein the antenna structure is configured to cover a first band and a second band, the first band is from about 698 MHz to about 960 MHz, and the second band is from about 1710 MHz to about 2690 MHz.

23. A method for manufacturing a mobile device, comprising the steps of:

providing a ground plane, a first radiation branch, and a second radiation branch;

coupling the second radiation branch to the ground plane, wherein the second radiation branch is disposed adjacent to the first radiation branch; and

using the first radiation branch and the second radiation branch to form an antenna structure, wherein the first radiation branch is fed from a signal source, and the second radiation branch is excited by the first radiation branch through coupling therebetween.

24. The method as claimed in claim 23, further comprising:

providing a metal back cover, wherein the metal back cover is disposed opposite to the ground plane; and

coupling the metal back cover through one or more shorted-circuit elements to the ground plane.

25. The method as claimed in claim 23, further comprising:

embedding a first circuit element in the first radiation branch; and

coupling one end of the second radiation branch through a second circuit element to the ground plane.

26. The method as claimed in claim 25, wherein the first circuit element comprises a capacitor and a first inductor, the capacitor is coupled in parallel to the first inductor, and the second circuit element comprises a second inductor.

27. A method for manufacturing a mobile device, comprising the steps of:

providing a first radiation branch, a second radiation branch, and a display-carrying element, wherein a ground plane is formed by the display-carrying element, the display-carrying element at least has a narrow and long concave region, and the first radiation branch is printed on a FPCB (Flexible Printed Circuit Board);

fixing the FPCB on a plastic supporting region of the display-carrying element, wherein the FPCB is disposed adjacent to the second radiation branch; and

using the first radiation branch and the second radiation branch to form an antenna structure, wherein the first radiation branch is fed from a signal source, and the second radiation branch is excited by the first radiation branch through coupling therebetween.