Antenna structure and electronic device

Patent metadata

Field	Value
Publication number	US-11637375-B2
Application number	US-202117204043-A
Country	US
Kind code	B2
Filing date	Mar 17, 2021
Priority date	Jul 29, 2020
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

An antenna structure includes: a branching radiator, including a plurality of first radiation modes; a ring-shaped radiator surrounding the branching radiator, and including a plurality of second radiation modes; a feeding point and a grounding point, one of which is connected to the ring-shaped radiator, and the other is connected to the branching radiator; an antenna gap, which is provided between the branching radiator and the ring-shaped radiator. The ring-shaped radiator and the branching radiator are coupled through the antenna gap to form coupled radiation modes. A coupling among the first radiation modes, the second radiation modes and the coupled radiation modes broaden a radiation bandwidth of the antenna structure. The antenna structure may be incorporated in an electronic device.

First claim

What is claimed is:

1. An antenna structure, comprising:
a branching radiator comprising a plurality of first radiation modes;
a ring-shaped radiator surrounding the branching radiator, and comprising a plurality of second radiation modes;
a feeding point and a grounding point, one of which is connected to the ring-shaped radiator, and the other is connected to the branching radiator;
an antenna gap, which is provided between the branching radiator and the ring-shaped radiator, the ring-shaped radiator and the branching radiator being coupled through the antenna gap to form coupled radiation modes, a coupling among the first radiation modes, the second radiation modes and the coupled radiation modes broadening a radiation bandwidth of the antenna structure;
wherein the branching radiator is connected to the feeding point, and the branching radiator comprises a first radiation branch located at one side of the feeding point and a second radiation branch located at the other side of the feeding point, resonance frequencies generated by the first radiation branch and the second radiation branch being different;
the grounding point is connected to the ring-shaped radiator, and the first radiation mode comprises a radiation mode of two times a quarter wavelength, the radiation mode of two times a quarter wavelength generating a resonance in a frequency band of Wifi 2.4G, and the wavelength being a free space wavelength corresponding to a center frequency of Wifi 2.4G, and
the grounding point is provided at an intersection of a symmetric line of the ring-shaped radiator and any side of the ring-shaped radiator, the intersection being a point with a high electric current when the first radiation mode is a radiation mode of two times a quarter wavelength or a point with a high electric current when the second radiation mode is a radiation mode of two times a half wavelength, the feeding point is provided at the symmetric line of the ring-shaped radiator.

2. The antenna structure according to claim 1 , wherein the antenna structure covers a frequency band of Wifi 6E.

3. The antenna structure according to claim 1 , wherein the ring-shaped radiator comprises one of a rectangular radiator, a circular ring-shaped radiator, a diamond-shaped radiator, and a triangular radiator.

4. The antenna structure according to claim 1 , wherein the ring-shaped radiator comprises a rectangular radiator, a length of each side of the rectangular radiator being 0.09 wavelengths, and the wavelength being a free space wavelength corresponding to a center frequency of Wifi 2.4G.

5. The antenna structure according to claim 1 , wherein the branching radiator comprises a T-shaped radiation branch.

6. The antenna structure according to claim 5 , wherein the T-shaped radiation branch comprises a first radiation branch and a second radiation branch, a length of the first radiation branch being 0.06 wavelengths, a length of the second radiation branch being 0.025 wavelengths, and the wavelength being a free space wavelength corresponding to a center frequency of Wifi 2.4G.

7. The antenna structure according to claim 1 , wherein lengths of the first radiation branch and the second radiation branch are different.

8. The antenna structure according to claim 1 , wherein the first radiation branch is a L-shaped radiation branch, and the second radiation branch is a T-shaped radiation branch.

9. An electronic device comprising an antenna structure, the antenna structure comprising:
a branching radiator comprising a plurality of first radiation modes;
a ring-shaped radiator surrounding the branching radiator, and comprising a plurality of second radiation modes;
a feeding point and a grounding point, one of which is connected to the ring-shaped radiator, and the other is connected to the branching radiator;
an antenna gap, which is provided between the branching radiator and the ring-shaped radiator, the ring-shaped radiator and the branching radiator being coupled through the antenna gap to form coupled radiation modes, a coupling among the first radiation modes, the second radiation modes and the coupled radiation modes broadening a radiation bandwidth of the antenna structure;
wherein the branching radiator is connected to the feeding point, and the branching radiator comprises a first radiation branch located at one side of the feeding point and a second radiation branch located at the other side of the feeding point, resonance frequencies generated by the first radiation branch and the second radiation branch being different;
the grounding point is connected to the ring-shaped radiator, and the first radiation mode comprises a radiation mode of two times a quarter wavelength, the radiation mode of two times a quarter wavelength generating a resonance in a frequency band of Wifi 2.4G, and the wavelength being a free space wavelength corresponding to a center frequency of Wifi 2.4G, and
the grounding point is provided at an intersection of a symmetric line of the ring-shaped radiator and any side of the ring-shaped radiator, the intersection being a point with a high electric current when the first radiation mode is a radiation mode of two times a quarter wavelength or a point with a high electric current when the second radiation mode is a radiation mode of two times a half wavelength, the feeding point is provided at the symmetric line of the ring-shaped radiator.

10. The electronic device according to claim 9 , wherein the antenna structure covers a frequency band of Wifi 6E.

11. The electronic device according to claim 9 , wherein the ring-shaped radiator comprises one of a rectangular radiator, a circular ring-shaped radiator, a diamond-shaped radiator, and a triangular radiator.

12. The electronic device according to claim 9 , wherein the ring-shaped radiator comprises a rectangular radiator, a length of each side of the rectangular radiator being 0.09 wavelengths, and the wavelength being a free space wavelength corresponding to a center frequency of Wifi 2.4G.

13. The electronic device according to claim 9 , wherein the branching radiator comprises a T-shaped radiation branch.

14. The electronic device according to claim 13 , wherein the T-shaped radiation branch comprises a first radiation branch and a second radiation branch, a length of the first radiation branch being 0.06 wavelengths, a length of the second radiation branch being 0.025 wavelengths, and the wavelength being a free space wavelength corresponding to a center frequency of Wifi 2.4G.

15. The electronic device according to claim 9 , further comprising:
a housing, wherein the antenna structure is disposed inside the housing.

16. The electronic device according to claim 15 , further comprising:
a battery compartment and a rear camera both disposed inside the housing, wherein the antenna structure is disposed between the battery compartment and the rear camera.

Assignees

• Beijing Xiaomi Mobile Software Co Ltd

Inventors

• Zhao Yarui
• Zhou Mingming
• Su Yuchuan

Classifications

• H01Q5/371

  Branching current paths · CPC title

• H01Q1/2291

  used in Bluetooth® or Wi-Fi® devices of Wireless Local Area Networks [WLAN] (H01Q1/241 takes precedence; WLAN in general H04W) · CPC title

• H01Q9/0414 Primary

  in a stacked or folded configuration · CPC title

• H01Q5/25

  Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems · CPC title

• H01Q9/04

  Resonant antennas · CPC title