EP-4738610-A2 - ANTENNA AND MOBILE TERMINAL

EP4738610A2EP 4738610 A2EP4738610 A2EP 4738610A2EP-4738610-A2

Abstract

This application provides an antenna and a mobile terminal. The antenna may include the following structures: a main stub, a first parasitic stub, and/or a second parasitic stub. The first parasitic stub and the second parasitic stub are respectively arranged on two sides of the main stub. The first parasitic stub and the second parasitic stub are configured to excite resonances to improve main resonance efficiency or expand bandwidth. During specific connection, the first parasitic stub is coupled to the main stub by electric field coupling, and a frequency of the resonance excited by the first parasitic stub is greater than a frequency of a resonance excited by the main stub. The second parasitic stub is coupled to the main stub by electric field and magnetic field coupling, and a frequency of the resonance excited by the second parasitic stub is less than the frequency of the resonance excited by the main stub. In the foregoing technical solution, the first parasitic stub and the second parasitic stub are coupled to the main stub in an electric field coupling manner or an electric field and magnetic field coupling manner, to excite a resonance to improve antenna efficiency, expand bandwidth, and improve antenna performance.

Inventors

XUE, LIANG
WANG, HANYANG
SHI, Chuanbo
GONG, YIWEN
WANG, JIKANG
ZHANG, XIAOWEI
YU, DONG

Assignees

Huawei Technologies Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20210630

Claims (12)

An antenna, comprising a main stub, a first parasitic stub, and a second parasitic stub, wherein the main stub comprises a first end and a second end, a feed point and a first ground point are disposed on the main stub, the feed point is closer to the second end than the first end, and the first ground point is closer to the first end than the second end; the first parasitic stub and the second parasitic stub are respectively arranged on two sides of the main stub; the first parasitic stub comprises a third end and a fourth end, the second parasitic stub comprises a fifth end and a sixth end, wherein the second end and the third end are free ends, and the first parasitic stub is coupled to the main stub via the gap between the second end and the third end; and wherein the first end is a ground end, the fifth end is a free end, and the second parasitic stub is coupled to the main stub via the gap between the first end and the fifth end; a second ground point is disposed at a location that is of the first parasitic stub and that is away from the third end; and a third ground point is disposed at a location that is of the second parasitic stub and that is away from the fifth end.
The antenna according to claim 1, wherein a frequency of a resonance excited by the first parasitic stub is greater than a frequency of a resonance excited by the main stub; and a frequency of a resonance excited by the second parasitic stub is less than the frequency of the resonance excited by the main stub.
The antenna according to claim 1 or 2, wherein the first parasitic stub is configured to excite a resonance in a first mode, and a first current flows from the second ground point of the first parasitic stub to the third end in a first mode; and the second parasitic stub is configured to excite a resonance in a second mode, and a second current flows from the fifth end of the second parasitic stub to the sixth end in the second mode.
The antenna according to claim 3, wherein the first current excites the 1/4 mode of the first parasitic stub; and the second current excites the 1/4 mode of the second parasitic stub.
The antenna according to any one of claims 1 to 4, wherein a main current flows from the first ground point of the main stub to the second end, and the main current excites the 1/4 mode of the main stub.
The antenna according to any one of claims 1 to 5, wherein the first parasitic stub is a parasitic stub configured to excite a resonance in a first mode, the second parasitic stub is a parasitic stub configured to excite a resonance in a second mode, and the first mode is the same as the second mode.
The antenna according to any one of claims 1 to 5, wherein the first parasitic stub is a parasitic stub configured to excite a resonance in a first mode, the second parasitic stub is a parasitic stub configured to excite a resonance in a second mode, and the first mode is different from the second mode.
The antenna according to claim 6 or 7, wherein in the first mode or the second mode is any one of: 1/4λ mode, 1/2λ mode, 3/4λ mode, or λ mode, wherein λ is a wavelength corresponding to an operating frequency of the antenna.
The antenna according to any one of claims 1 to 8, wherein the first parasitic stub is coupled to the main stub via the gap between the second end and the third end by electric filed coupling.
The antenna according to any one of claims 1 to 9, wherein the second parasitic stub is coupled to the main stub via the gap between the first end and the fifth end by electric field and magnetic field coupling.
A mobile terminal, comprising a housing and the antenna according to any one of claims 1 to 10 disposed in the housing.
The mobile terminal according to claim 11, wherein the housing comprises a metal frame, the antenna comprises a main stub, a first parasitic stub, and a second parasitic stub, each of the main stub, the first parasitic stub, and the second parasitic stub is a part of the metal frame.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202010615049.3, filed with the China National Intellectual Property Administration on June 30, 2020 and entitled "ANTENNA AND MOBILE TERMINAL", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of communications technologies, and in particular, to an antenna and a mobile terminal. BACKGROUND In mobile phone industry, a full-ceramic (or glass) appearance becomes a main direction of evolution of a mobile phone. This means that an originally-exposed metal frame (an antenna radiator) is inwardly retracted within a screen or battery cover. Decrease in clearance inside the mobile phone causes sharp deterioration in performance of an antenna. In the conventional technology, performance of an antenna is improved by adding a parasitic stub. However, in the conventional technology, the performance of the antenna is improved by using the parasitic stub to a limited extent. SUMMARY This application provides an antenna and a mobile terminal, to improve antenna performance. According to a first aspect, an antenna is provided. The antenna is applied to a mobile terminal, for example, a common mobile terminal such as a mobile phone, a tablet computer, or a notebook computer. The antenna may include the following structures: a main stub, a first parasitic stub, and/or a second parasitic stub. The first parasitic stub and the second parasitic stub are respectively arranged on two sides of the main stub. The first parasitic stub and the second parasitic stub are configured to excite resonances to improve main resonance efficiency or expand bandwidth. During specific connection, the first parasitic stub is coupled to the main stub by electric field coupling, and a frequency of the resonance excited by the first parasitic stub is greater than a frequency of a resonance excited by the main stub. The second parasitic stub is coupled to the main stub by electric field and magnetic field coupling, and a frequency of the resonance excited by the second parasitic stub is less than the frequency of the resonance excited by the main stub. In the foregoing technical solution, the first parasitic stub and the second parasitic stub are coupled to the main stub in an electric field coupling manner or an electric field and magnetic field coupling manner, to excite a resonance to improve antenna efficiency, expand bandwidth, and improve antenna performance. In a specific implementable solution, the first parasitic stub and the second parasitic stub may be disposed in different manners. For example, the antenna may include both the first parasitic stub and the second parasitic stub. Alternatively, the antenna includes only the first parasitic stub. Alternatively, the antenna includes only the second parasitic stub. In a specific implementable solution, when the antenna includes only the first parasitic stub or the second parasitic stub, the first parasitic stub or the second parasitic stub included in the antenna is a parasitic stub that can be configured to excite resonances in two different modes. Therefore, different resonances are provided to improve the antenna performance. In a specific implementable solution, when the antenna includes the first parasitic stub and the second parasitic stub, the first parasitic stub and the second parasitic stub are parasitic stubs that can be configured to excite resonances in different modes. For example, both the first parasitic stub and the second parasitic stub may excite resonances in two different modes. Alternatively, both the first parasitic stub and the second parasitic stub are parasitic stubs that are configured to excite only one resonance. The antenna performance can be improved by different parasitic stubs. In a specific implementable solution, the first parasitic stub is a parasitic stub configured to excite resonances in two different modes, and the second parasitic stub is a parasitic stub configured to excite resonances in two different modes. Two different resonances are excited by the first parasitic stub and the second parasitic stub, to improve the antenna performance. In a specific implementable solution, the resonances in the two different modes may include any two of a resonance in a 1/4λ mode, a resonance in a 1/2λ mode, a resonance in a 3/4λ mode, or a resonance in a λ mode. λ is a wavelength corresponding to an operating frequency of the antenna. The antenna performance is improved by using resonances in different modes. In a specific implementable solution, the main stub has a first end and a second end. The first parasitic stub is coupled to the first end by electric field coupling, and the second parasitic stub is coupled to the second end by electric field and magnetic field coupling. A first ground point is disposed on the main stub, and the first ground point is close to the second end. A second ground