Dual-frequency antenna structure for 5G metal frame mobile phone terminal

Abstract

The invention relates to a dual-frequency antenna structure for a 5G metal frame mobile phone terminal. The antenna structure comprises a metal frame and a metal front shell disposed in the metal frame. The side of the metal frame, corresponding to the metal front shell, is provided with an insulating bracket. The metal front shell is provided with a mainboard. The side of the mainboard, oppositeto the metal front shell, is covered with a copper layer. The mainboard is provided with a plurality of antenna units on the copper layer side. Each antenna unit includes a feed port and a feeder line. One end of the feed port is connected to the mainboard, and the other end is connected to the feeder line. The feeder line is an L-shaped structure, and the feeder line is mounted on the insulatingbracket. The metal front shell is provided with a first gap matched with the antenna unit. The first gap is parallel to the feeder line. The metal frame is provided with a second gap which is used foradjusting resonance length of the antenna unit to quarter wavelength. The dual-frequency antenna structure achieves purposes of miniaturization, dual frequency band and high isolation of an antenna,and provides a feasible technical scheme for design of a MIMO antenna of a 5G metal frame mobile phone terminal.

Description

technical field [0001] The invention relates to the field of antenna structure design for 5G mobile phone terminals, in particular to a dual-frequency MIMO (Multiple-input Multiple-output) antenna structure for 5G metal frame mobile phone terminals. Background technique [0002] With the advancement of the fifth-generation mobile communication technology (5G), the Ministry of Industry and Information Technology of China officially issued a statement on November 15, 2017, confirming that the 3300-3600MHz and 4800-5000MHz frequency bands will be used as low-frequency operating frequency bands for 5G systems. . The low-frequency working frequency band of the 5G system is also regarded as the pioneer frequency band of the 5G network, and the antenna design of 5G mobile phone terminals based on this low-frequency frequency band has gradually attracted widespread attention. However, due to the limitations of the size, material and antenna layout of existing mobile phones, the dif...

AI Technical Summary

Problems solved by technology

The document "Conceptual design and implementation of a four‐element MIMO antenna system packaged within a metallic handset" discloses a 4×4 MIMO antenna design scheme for a 5G metal frame mobile phone terminal. The antenna scheme consists of four identical slot-shaped microstrip magnetic couples Composed of poles, the antenna achieves good working characteristics, but the size of the antenna in this solution is too large, and it is not easy to arrange it in the mobile terminal

The document "Compacteight-antenna array in the smartphone for the 3.5-GHz LTE 8 × 8 MIMOoperation" further proposes to design 8 × 8 MIMO metal frame mobile phone antennas by means of coupled feeding, and to improve the isolation between antennas by adding a neutral line , the antenna works in the 3.5GHz frequency band. Although the isolation of the antenna structure is greater than -12dB, the size of the antenna occupying the side of the mobile phone is only 1×60mm 2 However, the antenna structure of this solution also works in the 3.5GHz single frequency band, and the card slot and volume keys in the mobile phone have great conflicts with the final realization of the solution

[0005] In summary, the above design schemes of 5G mobile phone terminal antennas all have certain design problems, which are divorced from actual engineering applications.

Images