CN114464994A

CN114464994A - Mobile phone antenna

Info

Publication number: CN114464994A
Application number: CN202210116864.4A
Authority: CN
Inventors: 周玮玮; 李品辉; 赵鲁豫; 陈绍武; 林海烽
Original assignee: Zhejiang Haitong Communication Electronics Co ltd
Current assignee: Zhejiang Haitong Communication Electronics Co ltd
Priority date: 2022-02-07
Filing date: 2022-02-07
Publication date: 2022-05-10

Abstract

The invention relates to a mobile phone antenna, which comprises a dielectric substrate and a metal floor layer positioned on one side of the dielectric substrate, wherein the dielectric substrate is provided with an antenna, and the antenna comprises a T-shaped monopole, a terminal open-circuit branch loaded on the metal floor layer and a gap etched on the metal floor layer. The invention has the advantages of better coverage of 1.7-2.7 GHz and low frequency band of 0.69-0.96 GHz.

Description

Mobile phone antenna

Technical Field

The invention relates to the technical field of mobile phone antennas, in particular to a mobile phone antenna.

Background

Mobile communication has been one of the most rapidly growing areas in today's society and is also one of the most important areas in people's lives, which have not been able to leave mobile communication. Mobile communication has undergone several generations of revolution, providing unprecedented high efficiency and convenience for people from mobile phones and the internet, and especially in the field of mobile communication, the appearance of electromagnetic waves realizes the leap development from wired communication to wireless communication, and current multimedia communication realizes the transmission of single voice data to integrated image, data, audio and other comprehensive business data. In recent years, with more and more terminal users and wireless data communication services, communication systems provide wider frequency band bandwidth and higher rate data communication services to the wireless, high speed and diversified demands, so that the wireless communication systems play more and more important roles in human life.

In the 4G and 5G communication era, intelligent terminals become main tools for people to connect with the Internet, and particularly in the Internet of things and the Internet of vehicles, the intelligent terminals are required to realize high-reliability and high-speed data transmission. Multiple Input Multiple Output (MIMO) technology is a key technology to solve this problem, and is widely used in base stations and mobile terminals for 4G communication. The MIMO system is characterized in that a transmitter or a receiver has a plurality of antennas, and transmission quality and system capacity can be improved by using multipath properties of a wireless channel without increasing transmission power and system spectrum. For a MIMO system to have good performance, the antenna elements must be uncorrelated (low coupling), however, the space that can be reserved for antennas in a mobile device is very limited, so that the spatial distance between antennas cannot be greater than or equal to one wavelength. Integrating multiple broadband antennas with low coupling in a portable device is then a relatively difficult problem, especially to reduce the coupling between multiple antennas in a limited space.

The appearance of miniaturized mobile products such as smart phones and the like presents higher challenges for antenna design, the design is objectively limited by physical dimensions, and the performance of the antenna, particularly the frequency band below a low frequency band (1 GHz), is a difficult point designed in the industry at present.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a mobile phone antenna which has the advantages of better coverage of 1.7-2.7 GHz and low frequency band of 0.69-0.96 GHz.

In order to achieve the purpose, the invention provides the following technical scheme: a mobile phone antenna comprises a dielectric substrate and a metal floor layer arranged on one side of the dielectric substrate, wherein the dielectric substrate is provided with an antenna, and the antenna comprises a T-shaped monopole, a terminal open-circuit branch loaded on the metal floor layer and a gap etched on the metal floor layer.

By adopting the technical scheme, aiming at the platform of the smart phone terminal, due to the limited geometrical size and the complex structural form of the antenna, the frequency band requirements of general products are basically that the frequency bands of GSM 850 (0.82-0.89 GHz), GSM 900 (0.88-0.96 GHz), DCS 1800 (1.71-1.88 GHz), PCS 1900 (1.85-1.99 GHz) and UMTS (1.9-2.17 GHz) required by 3G and 2G need to be covered, and the frequency bands of LTE 700 (0.69-0.78 GHz), LTE 2300 (2.3-2.4 GHz) and LTE 2500 (2.5-2.69 GHz) newly proposed by 4G need to be covered. The design space of the antenna is also greatly limited and the electromagnetic environment around the antenna becomes extremely complex, which also greatly increases the design difficulty of the antenna. Therefore, under the condition of ensuring that the performance is not influenced, designing an antenna capable of covering multiple frequency bands or a wide frequency band in a limited space is a main challenge of designing the antenna of the mobile phone at present. The covering of the multi-band or wide-band of the antenna is realized: if a conventional antenna is required to cover low frequency (700 MHz-960 MHz), the conventional antenna is difficult to cover, the conventional antenna is realized by a mode of switching an antenna switch commonly used at present, the cost is increased invisibly, meanwhile, the routing form of the antenna is fixed and single, and the performance cannot reach the optimal state. According to the mobile phone antenna designed by the invention, the traditional T-shaped monopole is improved by applying the multi-mode resonator theory, so that a new resonance mode is obtained, and the coverage of 1.7-2.7 GHz is realized. And secondly, the coverage of the antenna on 0.69-0.96 GHz is finished by loading quarter-wavelength terminal open-circuit branches on the floor and etching gaps on the floor. And finally, the antenna is fully covered.

The invention is further configured to: the T-shaped monopole is composed of a bent branch and a widened branch.

By adopting the technical scheme, the traditional T-shaped monopole is improved to obtain a new resonance mode, and the coverage of 1.7-2.7 GHz is realized.

The invention is further configured to: the antenna adopts a feedback mode to feed, and the feeding point is positioned at the lowest end of the T-shaped monopole.

By adopting the technical scheme, the feed is carried out by adopting a feedback mode.

The invention is further configured to: the terminal open-circuit branch and the T-shaped monopole are positioned on the same side of the antenna, the terminal open-circuit branch and a metalized through hole point of the T-shaped monopole penetrate through the dielectric substrate to be connected to the metal floor layer, and the distance between the metalized through hole point and the feeding position of the T-shaped monopole is one tenth of the wavelength.

By adopting the technical scheme, the terminal open-circuit branch and the T-shaped monopole are connected with the antenna

The invention is further configured to: the dielectric substrate is made of FR4, the dielectric constant of the dielectric substrate is 4.4, the tangent loss angle of the dielectric substrate is 0.02, the thickness of the dielectric substrate is 0.8 mm, and the overall dimension of the dielectric substrate is 40 multiplied by 120 mm.

By adopting the technical scheme, the shape of the medium substrate is limited, so that a better effect is achieved.

In conclusion, the invention has the following beneficial effects:

according to the mobile phone antenna designed by the invention, the traditional T-shaped monopole is improved by applying the multi-mode resonator theory, so that a new resonance mode is obtained, and the coverage of 1.7-2.7 GHz is realized. And secondly, the coverage of the antenna on 0.69-0.96 GHz is finished by a method of loading quarter-wavelength terminal open-circuit branches on the metal floor layer and etching gaps on the floor. And finally, the antenna is fully covered.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment;

fig. 2 is a diagram of the simulation result of S parameter.

Reference numerals: 1. a metal floor layer; 2. an antenna clearance area; 3. a T-shaped monopole; 4. a terminal open circuit branch; 5. a gap; 6. a feed point; 7. a dielectric substrate.

Detailed Description

The invention is further described with reference to the accompanying drawings.

A mobile phone antenna comprises a dielectric substrate 7 and a metal floor layer 1 positioned on one side of the dielectric substrate 7, wherein an antenna is arranged on the dielectric substrate 7 and comprises a T-shaped monopole 3, a terminal open-circuit branch 4 loaded on the metal floor layer 1 and a gap 5 etched on the metal floor layer 1. The dielectric substrate 7 is provided with an antenna clearance area 2.

The T-shaped monopole 3 is composed of a bent branch and a widened branch.

The antenna adopts a feedback mode to feed, and the feeding point is 6 at the lowest end of the T-shaped monopole 3.

The open-circuit terminal branch 4 and the T-shaped monopole 3 are located on the same side of the antenna, the open-circuit terminal branch 4 and the metallized through hole point of the T-shaped monopole 3 penetrate through the dielectric substrate 7 to be connected to the metal floor layer 1, and the distance between the metallized through hole point and the feed position of the T-shaped monopole 3 is one tenth of the wavelength.

The dielectric substrate 7 is made of FR4, and has a dielectric constant of 4.4, a tangent loss angle of 0.02, a thickness of 0.8 mm and an overall dimension of 40 × 120 mm.

The wavelength is 0.73 GHz. The opening gap 5 etched on the metal floor layer 1 is positioned near the T-shaped bending branch.

The antenna is simple in overall structure, free of a three-dimensional structure and an impedance matching network, and finally capable of comprehensively covering 0.69-0.96 GHz and 1.7-2.71 GHz frequency bands.

The result of fig. 2 shows that the designed antenna has a wider bandwidth, good radiation omnidirectionality and higher radiation efficiency, and completely meets the requirements of the actual work of the smart phone.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.

Claims

1. A mobile phone antenna comprises a dielectric substrate (7) and a metal floor layer (1) on one side of the dielectric substrate (7), and is characterized in that: the antenna is arranged on the dielectric substrate (7) and comprises a T-shaped monopole (3), a terminal open-circuit branch (4) loaded on the metal floor layer (1) and a gap (5) etched on the metal floor layer (1).

2. The handset antenna of claim 1, wherein: the T-shaped monopole (3) is composed of a bent branch and a widened branch.

3. A handset antenna according to claim 1, wherein: the antenna adopts a back feed mode for feeding, and the feeding point (6) is positioned at the lowest end of the T-shaped monopole (3).

4. The handset antenna of claim 1, wherein: the terminal open-circuit branch (4) and the T-shaped monopole (3) are located on the same side of the antenna, the terminal open-circuit branch (4) and a metalized through hole point of the T-shaped monopole penetrate through the dielectric substrate (7) to be connected to the metal floor layer (1), and the distance between the metalized through hole point and the feeding position of the T-shaped monopole is one tenth of the wavelength.

5. The handset antenna of claim 1, wherein: the dielectric substrate (7) is made of FR4, the dielectric constant of the dielectric substrate is 4.4, the tangent loss angle of the dielectric substrate is 0.02, the thickness of the dielectric substrate (7) is 0.8 mm, and the overall dimension of the dielectric substrate is 40 multiplied by 120 mm.