Wireless earphone

Patent metadata

Field	Value
Publication number	US-11997441-B2
Application number	US-202017780822-A
Country	US
Kind code	B2
Filing date	Nov 25, 2020
Priority date	Nov 30, 2019
Publication date	May 28, 2024
Grant date	May 28, 2024

Abstract

In an embodiment a wireless earphone includes an earbud portion having a speaker module, a stalk portion having a battery, wherein the earbud portion is connected to one end of the stalk portion, a circuit board and a first antenna being a slot antenna, wherein the circuit board extends from the earbud portion to an end of the stalk portion away from the earbud portion, wherein the circuit board is connected to the speaker module and the battery, wherein the circuit board comprises a reference ground, the reference ground extending from one end of the circuit board to another end of the circuit board, and wherein a slot is disposed on the reference ground forming a radiator of the slot antenna, the slot being located in the stalk portion and extending along a length direction of the stalk portion.

First claim

What is claimed is:

1. A wireless earphone comprising:
an earbud portion comprising a speaker module;
a stalk portion comprising a battery, wherein the earbud portion is connected to one end of the stalk portion;
a circuit board; and
a first antenna being a slot antenna,
wherein the circuit board extends from the earbud portion to an end of the stalk portion away from the earbud portion,
wherein the circuit board is connected to the speaker module and the battery,
wherein the circuit board comprises a reference ground, the reference ground extending from one end of the circuit board to another end of the circuit board, and
wherein a slot is disposed on the reference ground forming a radiator of the slot antenna, the slot being located in the stalk portion and extending along a length direction of the stalk portion.

2. The wireless earphone according to claim 1 ,
wherein the slot antenna further comprises a coupling stub, the coupling stub being located in the slot, and an extension direction of the coupling stub being the same as the extension direction of the slot,
wherein a feed point is disposed on the coupling stub, and
wherein the feed point is configured to provide a radio frequency signal to the radiator of the slot antenna.

3. The wireless earphone according to claim 2 ,
wherein the coupling stub extends from an end of the slot closer to the earbud portion to an end of the slot away from the earbud portion, and
wherein the feed point is located at an end of the coupling stub closer to the earbud portion.

4. The wireless earphone according to claim 2 ,
wherein the wireless earphone comprises a microstrip, one end of the microstrip being electrically connected to the feed point,
wherein the microstrip is configured to transmit the radio frequency signal for the slot antenna, and
wherein the microstrip comprises a transmission portion and a coupling portion connected to the transmission portion, the coupling portion extending in the slot forming the coupling stub of the slot antenna.

5. The wireless earphone according to claim 1 , wherein a length of the slot is a quarter of a wavelength corresponding to an operating frequency band of the slot antenna, and wherein an opening is disposed at one end of the slot.

6. The wireless earphone according to claim 5 , wherein the slot antenna comprises a feed point, wherein the feed point is configured to provide a radio frequency signal to the radiator of the slot antenna, wherein the feed point is located at a periphery of the slot, and wherein a distance between a location of the feed point and an end of the slot, away from the opening, is a 1/20 wavelength.

7. The wireless earphone according to claim 6 ,
wherein the stalk portion comprises:
a connecting segment connected to the earbud portion, and

a bottom segment located on one side of the connecting segment,
wherein an arrangement direction of the earbud portion and the connecting segment intersects an arrangement direction of the connecting segment and the bottom segment,
wherein the battery is located in the bottom segment,
wherein the circuit board comprises a first section, a second section, and a third section that are sequentially connected, the first section being located at the earbud portion, the second section being located at the connecting segment, and the third section being located at the bottom segment,
wherein the slot is arranged, from a location at which the third section is connected to the second section, in a direction in which the third section extends away from the second section,
wherein a sum of electrical lengths of the first section and the second section is greater than or equal to a ¼ wavelength, and
wherein an electrical length of the third section is greater than or equal to the ¼ wavelength.

8. The wireless earphone according to claim 1 , wherein the stalk portion comprises:
a connecting segment connected to the earbud portion, and
a top segment and a bottom segment that are located on two sides of the connecting segment,
wherein an arrangement direction of the earbud portion and the connecting segment intersects an arrangement direction of the connecting segment, the bottom segment and the top segment, the battery being located in the bottom segment, and
wherein the wireless earphone further comprises a second antenna, the second antenna being located in the top segment, a radiator of the second antenna comprising a feeding end and an extreme end away from the feeding end, and the feeding end being closer to the connecting segment than the extreme end.

9. The wireless earphone according to claim 8 ,
wherein the slot antenna is configured to excite the circuit board to generate a first equivalent current from the end of the stalk portion away from the earbud portion to an end of the earbud portion away from the stalk portion, and
wherein the second antenna is configured to excite the circuit board to generate a second equivalent current, a direction of the second equivalent current intersecting a direction of the first equivalent current.

10. The wireless earphone according to claim 9 ,
wherein the circuit board comprises a first section, a second section, and a third section that are sequentially connected, the first section being located at the earbud portion, the second section being located at the connecting segment, the third section being located at the bottom segment,
wherein an electrical length of the radiator of the second antenna is a ¼ wavelength, and
wherein an electrical length of the first section is the ¼ wavelength.

11. The wireless earphone according to claim 10 ,
wherein the slot antenna comprises the feed point, the feed point being located at an end of the third section closer to the second section,
wherein the feeding end of the second antenna is close to an end of the second section away from the third section, and
wherein an electrical length of the second section of the circuit board is the ¼ wavelength.

12. The wireless earphone according to claim 11 , wherein an electrical length of the third section of the circuit board is the ¼ wavelength.

13. The wireless earphone according to claim 12 , wherein the direction of the second equivalent current is a direction from the end of the earbud portion, which is away from the stalk portion to the extreme end, and wherein the direction of the first equivalent current is orthogonal to the direction of the second equivalent current.

14. The wireless earphone according to claim 12 , wherein the second section of the circuit board is disposed in the connecting segment in a bent manner.

15. The wireless earphone according to claim 8 , wherein the wireless earphone comprises an antenna support, the antenna support being located in the top segment, and wherein the radiator of the second antenna is disposed around the antenna support.

16. The wireless earphone according to claim 8 , wherein the second antenna is a monopole antenna or an inverted F antenna.

17. The wireless earphone according to claim 8 , further comprising a radio frequency front-end circuit coupled to the slot antenna and the second antenna, and configured to transmit radio frequency signals to the slot antenna and the second antenna or process radio frequency signals received by the slot antenna and the second antenna, wherein the radio frequency front-end circuit comprises an switching switch, the switching switch configured to switch the radio frequency front-end circuit so that it couples to the slot antenna or the second antenna.

18. The wi

Assignees

• Huawei Tech Co Ltd

Inventors

• Zhang Junhong
• Xu Huiliang
• Long Zhongying

Classifications

• H04R1/1016 Primary

  Earpieces of the intra-aural type · CPC title

• H04R1/1058

  Manufacture or assembly · CPC title

• H01Q1/273

  Adaptation for carrying or wearing by persons or animals · CPC title

• H01Q1/36

  Structural form of radiating elements, e.g. cone, spiral, umbrella; {Particular materials used therewith}(H01Q1/08, H01Q1/14 take precedence) · CPC title

• H04R1/1025

  Accumulators specially adapted for earpieces; Arrangements specially adapted for charging thereof · CPC title