Electronic device

Patent metadata

Field	Value
Publication number	US-10833396-B2
Application number	US-201916377990-A
Country	US
Kind code	B2
Filing date	Apr 8, 2019
Priority date	Mar 21, 2014
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

An electronic device includes a metal frame, an antenna feeding point, an antenna ground, a feeding branch, a grounding branch, an antenna resonance arm, a variable capacitor, and a control circuit. The antenna resonance arm is a part of the metal frame after segmentation, the antenna feeding point is disposed on the feeding branch, a first connection portion and a second connection portion are disposed on the antenna resonance arm, the feeding branch is disposed between the second connection portion and the antenna ground, the grounding branch is disposed between the first connection portion and the antenna ground, the variable capacitor is disposed on the feeding branch, the variable capacitor is disposed between the antenna feeding point and the second connection portion, and the control circuit is configured to adjust a capacitance of the variable capacitor.

First claim

What is claimed is:

1. An electronic device comprising:
a metal frame;
an antenna ground;
an antenna resonance arm, wherein the antenna resonance arm is a part of the metal frame after segmentation, wherein the antenna resonance arm comprises a first end portion and a second end portion, wherein a first connection portion, a second connection portion, and a third connection portion are disposed on the antenna resonance arm, wherein the first connection portion is disposed on the first end portion of the antenna resonance arm, and wherein the third connection portion is between the first connection portion and the second connection portion;
a feeding branch disposed between the second connection portion and the antenna ground, wherein a feeding point and a variable capacitor are disposed on the feeding branch, and wherein the variable capacitor is disposed between the second connection portion and the feeding point;
a grounding branch disposed between the first connection portion and the antenna ground;
a short grounding branch disposed between the third connection portion and the antenna ground, wherein the short grounding branch is provided with a controlled switch; and
a control circuit configured to:
control the controlled switch to be switched off or switched on; and
when the control switch is switched off,
generate a first resonance frequency by a part of the antenna resonance arm between the first connection portion and the second connection portion; and
generate a second resonance frequency by a part of the antenna resonance arm between the second connection portion and the second end portion of the antenna resonance arm, wherein the first resonance frequency is lower than the second resonance frequency.

2. The electronic device of claim 1 , wherein when the control switch is switched on, a third resonance frequency is generated by a part of the antenna resonance arm between the third connection portion and the second end portion of the antenna resonance arm.

3. The electronic device of claim 1 , wherein the electronic device further comprises a first inductor arranged in parallel to the controlled switch.

4. The electronic device of claim 3 , wherein an inductance of the first inductor comprises 5 nanoHenry (nH), 12 nH, or 11 nH.

5. The electronic device of claim 1 , wherein the control circuit is further configured to adjust a capacitance of the variable capacitor, wherein the capacitance of the variable capacitor comprises 0.7 picoFarad (pF), 1.2 pF, 1.7 pF, 2.2 pF, or 2.7 pF.

6. The electronic device of claim 1 , wherein the electronic device is cuboid, and wherein the metal frame is ring-shaped and is disposed on four side walls of the electronic device.

7. The electronic device of claim 1 , wherein a distance between the first connection portion and the second connection portion is less than one eighth of a wavelength of the first resonance frequency.

8. The electronic device of claim 1 , wherein the electronic device further comprises a first capacitor connected in parallel to the feeding point.

9. The electronic device of claim 1 , wherein the electronic device further comprises a first inductor connected in series with the feeding point and the variable capacitor.

10. The electronic device of claim 9 , wherein the first inductor is disposed between the feeding point and the variable capacitor.

11. The electronic device of claim 1 , wherein the antenna resonance arm further has a fourth connection portion disposed between the first connection portion and the third connection portion, wherein the electronic device further comprises a second capacitor disposed between the fourth connection portion and the antenna ground, and wherein the fourth connection portion is connected to the antenna ground using the second capacitor.

12. An electronic device comprising:
a metal frame;
an antenna ground;
an antenna resonance arm, wherein the antenna resonance arm is a part of the metal frame after segmentation, wherein the antenna resonance arm comprises a first end portion and a second end portion, wherein a first connection portion, a second connection portion, and a third connection portion are disposed on the antenna resonance arm, wherein the first connection portion is disposed on the first end portion of the antenna resonance arm, and wherein the third connection portion is between the first connection portion and the second connection portion;
a feeding branch disposed between the second connection portion and the antenna ground, wherein a feeding point and a variable capacitor are disposed on the feeding branch, and wherein the variable capacitor is disposed between the second connection portion and the feeding point;
a grounding branch disposed between the first connection portion and the antenna ground;
a short grounding branch disposed between the third connection portion and the antenna ground, wherein the short grounding branch is provided with a controlled switch; and
a control circuit configured to:
control the controlled switch to be switched off or switched on;
generate a first resonance frequency and a second resonance frequency by the antenna resonance arm when the controlled switch is switched off, wherein the first resonance frequency is lower than the second resonance frequency; and
generate a third resonance frequency by the antenna resonance arm when the controlled switch is switched on.

13. The electronic device of claim 12 , wherein the electronic device further comprises a first inductor arranged in parallel to the controlled switch.

14. The electronic device of claim 13 , wherein a first inductance of the first inductor comprises 5 nanoHenry (nH), 12 nH, or 11 nH.

15. The electronic device of claim 12 , wherein the control circuit is further configured to adjust a capacitance of the variable capacitor, and wherein the capacitance of the variable capacitor comprises 0.7 picoFarad (pF), 1.2 pF, 1.7 pF, 2.2 pF, or 2.7 pF.

16. The electronic device of claim 12 , wherein the electronic device is cuboid, and wherein the metal frame is ring-shaped and is disposed on four side walls of the electronic device.

17. The electronic device of claim 12 , wherein a distance between the first connection portion and the second connection portion is less than one eighth of a wavelength of the first resonance frequency.

18. The electronic device of claim 12 , wherein the electronic device further comprises a first capacitor connected in parallel to the feeding point.

19. The electronic device of claim 12 , wherein the electronic device further comprises a first inductor connected in series with the feeding point and the variable capacitor.

20. The electronic device of claim 19 , wherein the first inductor is disposed between the feeding point and the variable capacitor.

21. The electronic device of claim 12 , wherein the antenna resonance arm further has a fourth connection portion disposed between the first connection portion and the third connection portion, wherein the electronic device further comprises a second capacitor disposed between the fourth connection portion and the antenna ground, and wherein the fourth connection portion is connected to the antenna ground using the second capacitor.

22. An electronic device comprising:
a metal frame;
an antenna ground;
an antenna resonance arm, wherein the antenna resonance arm is a part of the metal frame after segmentation, wherein the antenna resonance arm comprises a first end portion and

Assignees

• Huawei Device Co Ltd

Inventors

• Li Jianming
• Feng Kun
• Zhang Xuefei
• Wang Hanyang

Classifications

• H01Q5/328

  between a radiating element and ground · CPC title

• H01Q5/335

  at the feed, e.g. for impedance matching · CPC title

• H01Q1/243 Primary

  with built-in antennas · CPC title

• H01Q9/42

  with folded element, the folded parts being spaced apart a small fraction of the operating wavelength · CPC title

• H01Q1/50

  Structural association of antennas with earthing switches, lead-in devices or lightning protectors · CPC title