MOBILE DEVICE AND ANTENNA STRUCTURE THEREIN

• US 20140062815A1
• Filed: 07/11/2013
• Published: 03/06/2014
• Est. Priority Date: 08/29/2012
• Status: Active Grant

• Current Assignee: HTC Corporation
• Original Assignee: HTC Corporation
• Inventors: WU, Wei-Yang, WU, Hsiao-Wei, TSAI, Tiao-Hsing, CHIU, Chien-Pin
• Granted Patent: US 10,027,025 B2
• Time in Patent Office: Days
• US Class Current: 343/745
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H01Q 13/103 with variable reactance for tuning the antenna tuning resonant circuits H03J
• CPC Class Codes: H01Q 5/335 at the feed, e.g. for impedance matching
• CPC Class Codes: H01Q 5/50 Feeding or matching arrangements for broad-band or multi-band operation
• CPC Class Codes: H01Q 9/0442 with particular tuning means
• 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 an antenna structure, a signal source, a tunable circuit element, and a tuner. The antenna structure includes a radiation element. The tunable circuit element is coupled to the radiation element. The antenna structure and the tunable circuit element are disposed in a clearance region of the mobile device. The tuner has a variable impedance value, and is coupled between the tunable circuit element and the signal source. The tuner and the signal source are disposed in a circuit board region of the mobile device.

Claims

1. A mobile device, comprising:

an antenna structure, comprising a radiation element;

a signal source;

a tunable circuit element, coupled to the radiation element, wherein the antenna structure and the tunable circuit element are disposed in a clearance region of the mobile device; and

a tuner, having a variable impedance value, and coupled between the tunable circuit element and the signal source, wherein the tuner and the signal source are disposed in a circuit board region of the mobile device.

2. The mobile device as claimed in claim 1, wherein the tunable circuit element comprises a variable capacitor.

3. The mobile device as claimed in claim 2, wherein a first terminal of the variable capacitor is coupled to the radiation element, and a second terminal of the variable capacitor is coupled to the tuner.

4. The mobile device as claimed in claim 2, wherein the tunable circuit element further comprises an inductor, and the inductor and the variable capacitor are coupled in parallel or coupled in series between the radiation element and the tuner.

5. The mobile device as claimed in claim 2, wherein a first terminal of the variable capacitor is coupled to the radiation element and the tuner, and a second terminal of the variable capacitor is coupled to a ground voltage.

6. The mobile device as claimed in claim 1, wherein the tunable circuit element comprises a variable inductor.

7. The mobile device as claimed in claim 6, wherein a first terminal of the variable inductor is coupled to the radiation element, and a second terminal of the variable inductor is coupled to the tuner.

8. The mobile device as claimed in claim 6, wherein the tunable circuit element further comprises a capacitor, and the capacitor and the variable inductor are coupled in parallel or coupled in series between the radiation element and the tuner.

9. The mobile device as claimed in claim 6, wherein a first terminal of the variable inductor is coupled to the radiation element and the tuner, and a second terminal of the variable inductor is coupled to a ground voltage.

10. The mobile device as claimed in claim 1, wherein the tunable circuit element comprises a variable capacitor and a variable inductor.

11. The mobile device as claimed in claim 10, wherein a first terminal of the variable capacitor is coupled to the radiation element and the tuner, a second terminal of the variable capacitor is coupled to a ground voltage, a first terminal of the variable inductor is coupled to the radiation element and the tuner, and a second terminal of the variable inductor is coupled to the ground voltage.

12. The mobile device as claimed in claim 10, wherein a first terminal of the variable capacitor is coupled to the radiation element and the tuner, a second terminal of the variable capacitor is coupled to a first terminal of the variable inductor, and a second terminal of the variable inductor is coupled to a ground voltage.

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

a processor, disposed in the circuit board region, and configured to control the tunable circuit element and the tuner such that the antenna structure is capable of operating in different bands.

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

a ground plane, disposed in the circuit board region of the mobile device.

15. The mobile device as claimed in claim 14, wherein the antenna structure further comprises:

a grounding branch, coupled to the ground plane, and forming the radiation element, wherein a slot is formed between the ground plane and the grounding branch; and

a feeding element, extending across the slot, wherein the signal source is coupled through the tuner, the tunable circuit element, and the feeding element to the grounding branch.

16. The mobile device as claimed in claim 15, wherein the tunable circuit element is embedded in the feeding element.

17. The mobile device as claimed in claim 15, wherein the tunable circuit element is coupled in series to the feeding element.

18. The mobile device as claimed in claim 15, wherein the tunable circuit element is coupled between the feeding element and the ground plane.

19. The mobile device as claimed in claim 15, further comprising:

a dielectric substrate, wherein the circuit board region and the ground plane are disposed on the dielectric substrate.

20. The mobile device as claimed in claim 15, further comprising:

one or more electronic components, disposed on the grounding branch of the antenna structure, and coupled to the antenna structure.