CN220510256U

CN220510256U - Antenna structure for 5G mobile terminal

Info

Publication number: CN220510256U
Application number: CN202321735103.3U
Authority: CN
Inventors: 李博章; 王斌坚; 朱锐彪
Original assignee: Shenzhen Xun Rui Communication Co ltd
Current assignee: Shenzhen Xun Rui Communication Co ltd
Priority date: 2023-07-04
Filing date: 2023-07-04
Publication date: 2024-02-20
Anticipated expiration: 2033-07-04

Abstract

The utility model provides an antenna structure for a 5G mobile terminal, which comprises an MHB+5GNR main antenna, a 5GNR monopole antenna and an MHB+5GNR parasitic antenna, wherein the MHB+5GNR main antenna is arranged in an upper frame of the 5G mobile terminal and is close to a right frame, the 5GNR monopole antenna is arranged in the right frame of the 5G mobile terminal and is close to the upper frame, the MHB+5GNR parasitic antenna is arranged between the MHB+5GNR main antenna and the 5GNR monopole antenna and is not contacted with each other, the MHB+5GNR parasitic antenna is integrally and tightly attached to the inner side of the right upper corner frame of the 5G mobile terminal, and an antenna switch is arranged in one end of the MHB+5GNR parasitic antenna close to the 5GNR monopole antenna. The beneficial effects of the utility model are as follows: good isolation and return loss can be maintained in a limited space, and the total radiation efficiency of the whole antenna structure is improved.

Description

Antenna structure for 5G mobile terminal

Technical Field

The utility model relates to the technical field of communication, in particular to an antenna structure for a 5G mobile terminal.

Background

With the increasing advancement of the fifth generation mobile communication technology (5G), the development of the 5G low frequency (Sub-6 GHz) band is increasingly emphasized, and beginning in 2018, the 5G low frequency (Sub-6 GHz) band is formally determined in china. For the design of the 5G low-frequency band mobile terminal antenna, the design is not very different from the current 4G antenna design in nature, but the current 4G antenna is not capable of meeting the requirement of high-speed transmission of five-generation mobile terminal communication. Therefore, the existing 5G mobile terminal device is basically configured with multiple antennas, each antenna often has multiple frequency bands, and since the current definition of the mobile terminal device is mainly light, thin and high-screen duty ratio, the design space of the antenna is greatly reduced, these factors are fatal to the antenna design, and to meet the performance index requirements (including total radiation efficiency and return loss) of the antenna, the reasonable antenna layout is particularly critical.

In order to meet the performance index design requirement of the antenna in a limited design space, the existing antenna design scheme is a mode that an MHB+5G NR main antenna and a 5G NR monopole antenna are mutually matched and tuned, and a feed foot of the MHB+5G NR main antenna is connected with an antenna switch for tuning. But this approach affects the bandwidth of the overall antenna structure, the overall radiation efficiency is poor, the isolation between the mhb+5g NR main antenna and the 5G NR monopole antenna is poor, and optimizing the isolation takes longer. The reason for poor total radiation efficiency is that the MHB+5G NR main antenna is matched with the 5G NR monopole antenna, excessive loss is brought by the antenna switch of the MHB+5G NR main antenna, and the reason for poor isolation between the MHB+5G NR main antenna and the adjacent 5G NR monopole antenna is that crosstalk occurs on the surface currents of the two antennas.

Therefore, the existing antenna design has a certain design problem. In the use of the 5G mobile terminal, the requirement of high data rate of the 5 th generation mobile communication system needs to be met, interference between antennas needs to be reduced in a limited space, and good isolation and total radiation efficiency need to be maintained, which is a difficult problem to solve.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides an antenna structure for a 5G mobile terminal, which can reduce interference among antennas in a limited space, can keep good isolation and return loss, improves the total radiation efficiency of the whole antenna structure, and solves the problems of low total radiation efficiency, serious interference among antennas and poor isolation of the antenna design of the 5G mobile terminal in the prior art.

The antenna structure for the 5G mobile terminal comprises an MHB+5G NR main antenna, a 5G NR monopole antenna and an MHB+5G NR parasitic antenna which are mutually matched, wherein the MHB+5G NR main antenna, the 5G NR monopole antenna and the MHB+5G NR parasitic antenna are respectively and electrically connected with a main control circuit board in the 5G mobile terminal, the MHB+5G NR main antenna is arranged in an upper frame of the 5G mobile terminal and is close to the right frame, the 5G NR monopole antenna is arranged in the right frame of the 5G mobile terminal and is close to the upper frame, the MHB+5G NR parasitic antenna is arranged between the MHB+5G NR main antenna and the 5G NR monopole antenna and is not in contact with each other, the MHB+5G NR parasitic antenna is integrally and closely attached to the inner side of the upper right corner frame of the 5G mobile terminal, a switch is arranged in one end of the MHB+5G NR parasitic antenna, and the MHB+5G parasitic antenna can be coupled with the MHB+5G mobile terminal to the MHB 5G main antenna and the MHN 1/5G parasitic antenna, and the MHB+5G parasitic antenna can reduce current to the MHB+5G main antenna and the MHN 1/N4/N1N/N4.

According to the utility model, a parasitic antenna feed foot is arranged in one end of the MHB+5G NR parasitic antenna close to the 5G NR monopole antenna, the antenna switch is fixedly arranged at the parasitic antenna feed foot, a parasitic antenna feed point for leading out signals is arranged in one end of the MHB+5G NR parasitic antenna close to the MHB+5G NR main antenna, and the parasitic antenna feed foot and the parasitic antenna feed point extend from the MHB+5G NR parasitic antenna to the inside of the 5G mobile terminal.

According to the utility model, a main antenna feed foot is arranged in one end of the MHB+5G NR main antenna, which is far away from the MHB+5G NR parasitic antenna, a main antenna feed point for leading out signals is arranged in one end of the MHB+5G NR main antenna, which is close to the MHB+5G NR parasitic antenna, and the main antenna feed foot and the main antenna feed point extend from the MHB+5G NR main antenna to the inside of the 5G mobile terminal.

According to the utility model, a monopole antenna feed foot is arranged in one end of the 5G NR monopole antenna far away from the MHB+5G NR parasitic antenna, a monopole antenna feed point for leading out signals is arranged in one end of the 5G NR monopole antenna close to the MHB+5G NR parasitic antenna, and the monopole antenna feed foot and the monopole antenna feed point extend from the 5G NR monopole antenna to the inside of the 5G mobile terminal.

The utility model is further improved, and the length of the MHB+5G NR parasitic antenna is selected to be 1/8 to 1/2 of the length of the wavelength corresponding to the frequency of 1.8GHz in the B3 frequency band.

The utility model is further improved, and the length of the MHB+5G NR main antenna is selected to be 1/8 to 1/2 of the length of the wavelength corresponding to the frequency of 2.09GHz in the B1 frequency band.

The utility model is further improved, and the length selection range of the 5G NR monopole antenna is 1/8 to 1/2 of the length of the corresponding wavelength of the 3.3GHz frequency in the N77 frequency band.

The utility model is further improved, the length of the MHB+5G NR parasitic antenna can be changed by accessing capacitance and/or inductance into the MHB+5G NR parasitic antenna, and the MHB+5G NR main antenna is coupled to B/N1, B/N3, B/N40, B/N41, N77 and N78 frequency bands.

The utility model is further improved, the distance between the MHB+5G NR parasitic antenna and the MHB+5GNR main antenna is less than or equal to 0.5mm and less than or equal to 5mm, and the distance between the MHB+5G NR parasitic antenna and the 5G NR monopole antenna is less than or equal to 0.5mm and less than or equal to 5mm.

The utility model is further improved, and the working frequency band of the MHB+5G NR main antenna comprises B/N1:2.11GHz-2.17GHz, B/N3:1.8GHz-1.88GHz, B/N40:2.3GHz-2.4GHz, B/N41:2.496GHz-2.690GHz, N77:3.3GHz-4.2GHz and N78:3.3GHz-3.8GHz; the working frequency band of the MHB+5GNR parasitic antenna comprises B/N1:2.11GHz-2.17GHz, B/N3:1.8GHz-1.88GHz, B/N40:2.3GHz-2.4GHz, B/N41:2.496GHz-2.690GHz, N77:3.3GHz-4.2GHz and N78:3.3GHz-3.8GHz; the working frequency band of the 5G NR monopole antenna comprises N77:3.3GHz-4.2GHz and N78:3.3GHz-3.8GHz.

Compared with the prior art, the utility model has the beneficial effects that: the utility model provides an antenna structure for a 5G mobile terminal, which is characterized in that an MHB+5G NR main antenna, a 5G NR monopole antenna and an MHB+5G NR parasitic antenna which are mutually matched are arranged in a 5G mobile terminal frame, the MHB+5G NR parasitic antenna can couple the MHB+5GNR main antenna to B/N1, B/N3, B/N40, B/N41, N77 and N78 frequency bands, current crosstalk between the MHB+5G NR main antenna and the 5G NR monopole antenna can be reduced, interference between antennas can be reduced in a limited space, loss caused by antenna switching can be reduced, good isolation and return loss can be kept, the total radiation efficiency of the whole antenna structure is improved, the high-speed multi-data communication requirement of a 5G mobile communication system can be met, the problem that the total radiation efficiency of the antenna design of the 5G mobile terminal is low, the antenna interference and poor isolation in the prior art can be solved.

Drawings

For a clearer description of the present application or of the solutions of the prior art, a brief introduction will be given below to the drawings used in the description of the embodiments or of the prior art, it being apparent that the drawings in the description below are some embodiments of the present application, from which other drawings can be obtained, without the inventive effort for a person skilled in the art.

Fig. 1 is a block diagram of an antenna structure for a 5G mobile terminal according to the present utility model;

FIG. 2 is a return loss plot of the MHB+5G NR main antenna+MHB+5G NR parasitic antenna of the present utility model;

FIG. 3 is a return loss diagram of an MHB+5G NR parasitic antenna access antenna switch of the present utility model cut to different frequency bands;

FIG. 4 is a graph of the total radiation efficiency of the MHB+5G NR parasitic antenna access antenna switch of the present utility model cut into different frequency bands;

FIG. 5 is a return loss plot using only MHB+5G NR main antennas;

FIG. 6 is a graph of return loss for switching the antenna switch to different frequency bands at the main antenna feed leg access when only the MHB+5G NR main antenna is employed;

FIG. 7 is a graph of total radiation efficiency of a main antenna feed leg access antenna switch switched to different frequency bands when only an MHB+5G NR main antenna is employed;

FIG. 8 is a return loss plot of a 5G NR monopole antenna after matching the MHB+5G NR primary antenna according to the present utility model;

FIG. 9 is a graph of the overall radiation efficiency of the 5G NR monopole antenna after matching the MHB+5G NR primary antenna according to the present utility model;

fig. 10 is a graph comparing the isolation between the mhb+5g NR main antenna and the 5G NR monopole antenna with or without the mhb+5g NR parasitic antenna of the present utility model.

In the figure, 1-MHB+5G NR main antenna, 11-main antenna feed leg, 12-main antenna feed point, 2-5G NR monopole antenna, 21-monopole antenna feed leg, 22-monopole antenna feed point 22, 3-MHB+5G NR parasitic antenna, 31-antenna switch, 32-parasitic antenna feed leg, 33-parasitic antenna feed point.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In order to better understand the technical solutions of the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings.

As shown in fig. 1, the antenna structure for a 5G mobile terminal provided by the utility model comprises an mhb+5g NR main antenna 1, a 5g NR monopole antenna 2 and an mhb+5g NR parasitic antenna 3 which are mutually matched, the mhb+5g NR main antenna 1, the 5g NR monopole antenna 2 and the mhb+5g NR parasitic antenna 3 are respectively and electrically connected with a main control circuit board in the 5G mobile terminal, the mhb+5g NR main antenna 1 is arranged in an upper frame of the 5G mobile terminal and is close to the right frame, the 5g NR monopole antenna 2 is arranged in the right frame of the 5G mobile terminal and is close to the upper frame, the mhb+5g NR parasitic antenna 3 is arranged between the mhb+5g NR main antenna 1 and the 5g NR monopole antenna 2 and is not in contact with each other, the mhb+5g NR parasitic antenna 3 is integrally and closely attached to the inner side of the right upper corner frame of the 5G mobile terminal, and an antenna switch 31 is arranged in one end of the mhb+5g parasitic antenna 3 close to the 5G monopole antenna 2. In this embodiment, the mhb+5g NR parasitic antenna can couple the mhb+5g NR main antenna to the B/N1, B/N3, B/N40, B/N41, N77, and N78 frequency bands, and can reduce current crosstalk between the mhb+5gnr main antenna and the 5G NR monopole antenna, so that interference between antennas can be reduced in a limited space, loss caused by antenna switching is reduced, good isolation and return loss can be kept, total radiation efficiency of the whole antenna structure is improved, and requirements of high-rate multi-data communication of a 5 th generation mobile communication system of a 5G mobile terminal can be met. The antenna structure in this embodiment is in a metal frame form, the antenna switch is reasonably connected to the MHB+5GNR parasitic antenna to change the resonance position of the adjacent MHB+5G NR main antenna to cover the required frequency band, so that the main antenna feed foot of the MHB+5G NR main antenna can cover the required frequency band without being connected to the switch, the total radiation efficiency is improved by 2-4dB, the MHB+5G NR parasitic antenna reduces the crosstalk of the MHB+5G NR main antenna and the 5G NR monopole antenna surface current, the optimal isolation is below-15 dB, and the industrial standard is reached, and the design frequency band of the MHB+5GNR parasitic antenna is B/N1, B/N3, B/N40, B/N41, N77 and N78.MHB is an abbreviation for middle high band, meaning medium and high frequency; NR, an abbreviation for New radio, is a generic term for 5G antennas in the antenna arts; MHB and NR are common terms in the antenna arts.

As shown in fig. 1, a parasitic antenna feed leg 32 is arranged in one end of the mhb+5g NR parasitic antenna 3 close to the 5G NR monopole antenna 2, an antenna switch 31 is fixedly arranged at the parasitic antenna feed leg 32, a parasitic antenna feed point 33 for extracting signals is arranged in one end of the mhb+5g NR parasitic antenna 3 close to the mhb+5g NR main antenna 1, and the parasitic antenna feed leg 32 and the parasitic antenna feed point 33 extend from the mhb+5g NR parasitic antenna 3 to the inside of the 5G mobile terminal; the length of the MHB+5GNR parasitic antenna 3 is selected to be 1/8 to 1/2 of the wavelength length corresponding to the frequency of 1.8GHz in the B3 frequency band; the length of the MHB+5G NR parasitic antenna 3 can be changed by accessing a capacitor and/or an inductor, and the MHB+5G NR parasitic antenna 3 is coupled with the frequency bands of the MHB+5G NR main antenna 1 to B/N1, B/N3, B/N40, B/N41, N77 and N78; the distance between the MHB+5G NR parasitic antenna and the MHB+5G NR main antenna is less than or equal to 0.5mm and less than or equal to 5mm, and the distance between the MHB+5G NR parasitic antenna and the 5G NR monopole antenna is less than or equal to 0.5mm and less than or equal to 5mm; the working frequency band of the MHB+5G NR parasitic antenna comprises B/N1:2.11GHz-2.17GHz, B/N3:1.8GHz-1.88GHz, B/N40:2.3GHz-2.4GHz, B/N41:2.496GHz-2.690GHz, N77:3.3GHz-4.2GHz and N78:3.3GHz-3.8GHz. In this embodiment, the main mhb+5g NR antenna is the main radiation antenna in this embodiment, the parasitic mhb+5g NR antenna is the auxiliary antenna in this embodiment, and the length of the parasitic mhb+5gnr antenna is selected to be 1/8 to 1/2 of the wavelength length corresponding to the frequency of 1.8GHz in the B3 band, (c=λ) ₂ f ₂ ，c＝2.97*10^8，f ₂ ＝1.8g，λ ₂ ＝C/f ₂ =0.165 m), the value is 20mm, the occupation space of the MHB+5G NR parasitic antenna is reduced by utilizing the principle, and the MHB+5G NR parasitic antenna and the MHB+5G NR main antenna can be coupled to a 1.8G resonance position in a required B3 frequency band, as shown in figure 2; fig. 3 is a return loss diagram of the switch of the mhb+5g NR parasitic antenna to different frequency bands in the design scheme of the mhb+5g NR main antenna+mhb+5g NR parasitic antenna, and fig. 4 is a design scheme of the mhb+5g NR main antenna+mhb+5g NR parasitic antennaThe total radiation efficiency of the MHB+5G NR parasitic antenna switch cut-in antenna switch to different frequency bands can be seen from the graph, when the MHB+5G NR parasitic antenna switch is cut-in antenna switch, the antenna switch does not bring loss when the main antenna of the MHB+5G NR main antenna is not connected in the ground pin switch, the antenna switch cut-in capacitance and/or inductance of the MHB+5G NR parasitic antenna changes the length of the MHB+5G NR parasitic antenna, and the antenna switch cut-in capacitance and/or inductance of the MHB+5G NR parasitic antenna is used for coupling the MHB+5G NR main antenna to form different resonance positions to cover the required frequency bands. The return loss is also called S11 (generally represented by a negative number in software), and the physical meaning can be understood as the ratio of the power of a signal reflected back to the 1 port through an antenna circuit to the power of the 1 port transmitted, the smaller the signal transmitted back (which indicates that the signal is radiated to space through the antenna), the larger the absolute value of S11, which generally defines that when S11 is smaller than-10 dB, the antenna is in a working state in this frequency band, radiates the signal outwards or when receiving the signal, and sometimes the S11 is required to be smaller than-20 dB by a strict antenna. In the design of the antenna, the ideal antenna is not considered with a feed point, but in order to draw out the signal, the point from which the signal is drawn is called the feed point, the english language is expressed by a feed point, the addition of which generally affects the field distribution of the antenna, and the choice of this point is taught in the present embodiment for improving the overall radiation efficiency of the antenna structure.

As shown in fig. 1, a main antenna feed leg 11 is arranged in one end of the mhb+5g NR main antenna 1, which is far away from the mhb+5g NR parasitic antenna 3, a main antenna feed point 12 for leading out signals is arranged in one end of the mhb+5g NR main antenna 1, which is close to the mhb+5g NR parasitic antenna 3, and the main antenna feed leg 11 and the main antenna feed point 12 extend from the mhb+5g NR main antenna 1 to the inside of the 5G mobile terminal; the length of the MHB+5G NR main antenna 1 is selected to be 1/8 to 1/2 of the wavelength length corresponding to the frequency of 2.09GHz in the B1 frequency band; the working frequency band of the MHB+5G NR main antenna 1 comprises B/N1:2.11GHz-2.17GHz, B/N3:1.8GHz-1.88GHz, B/N40:2.3GHz-2.4GHz, B/N41:2.496GHz-2.690GHz, N77:3.3GHz-4.2GHz and N78:3.3GHz-3.8GHz. In this embodiment, the MHB+5G NR main Antenna essentially forms an IFA Antenna form, and the IFA Antenna (Inverted-F Antenna), also called Inverted-F Antenna, has frequency bands of B/N1, B/N3, B/N40, B/N41, N77 and N78. Length selection range of MHB+5G NR main antennaThe value of the frequency of 2.09GHz in the B1 frequency band is 1/8 to 1/2 of the wavelength length corresponding to the frequency of 2.09GHz, which is 35.5mm in the embodiment, and accords with the characteristic that the IFA antenna receives fundamental waves with about four times of the self length (c=lambda) ₁ f ₁ ，c＝2.97*10^8，λ ₁ =4x35.5=0.142 m, f1=c/λ1≡2.09 GHz), N77, N78 are resonances resulting from three and five times doubling of the antenna. When the initial resonance of the main antenna with mhb+5gnr is shown in fig. 5, that is, S11 of the main antenna with mhb+5g NR is used, fig. 6 is S11 of the main antenna with mhb+5g NR is used when the main antenna with mhb+5g NR is connected to the antenna switch, and fig. 7 is the total radiation efficiency (switching loss is introduced) of the main antenna with mhb+5g NR is connected to the antenna switch. As can be seen from the figure, when only the mhb+5g NR main antenna is adopted, the total radiation efficiency is poor, the isolation between the mhb+5g NR main antenna and the adjacent 5G NR monopole antenna is poor, the reason for the poor total radiation efficiency is that the mhb+5g NR main antenna is matched with the 5G NR monopole antenna, the antenna switch of the mhb+5g NR main antenna brings excessive loss, and the reason for the poor isolation between the mhb+5g NR main antenna and the adjacent 5G NR monopole antenna is that the surface currents of the two antennas are crosstalked.

As shown in fig. 1, a monopole antenna feed leg 21 is arranged in one end of the 5G NR monopole antenna 2 far from the mhb+5g NR parasitic antenna 3, a monopole antenna feed point 22 for leading out signals is arranged in one end of the 5G NR monopole antenna 2 near the mhb+5g NR parasitic antenna 3, and the monopole antenna feed leg 21 and the monopole antenna feed point 22 extend from the 5G NR monopole antenna 2 to the inside of the 5G mobile terminal; the length of the 5G NR monopole antenna is selected to be 1/8 to 1/2 of the length of the wavelength corresponding to the frequency of 3.3GHz in the N77 frequency band; the operating frequency band of the 5G NR monopole antenna 2 includes N77:3.3GHz-4.2GHz and N78:3.3GHz-3.8GHz. In this embodiment, the 5G NR monopole antenna is essentially a monopole antenna, the length selection range is 1/8 to 1/2 of the length of the wavelength corresponding to the 3.3GHz frequency in the N77 frequency band, the value in this embodiment is 22.1mm, the 5G NR monopole antenna S11 after matching the mhb+5g NR main antenna is as shown in fig. 8, the total radiation efficiency of the 5G NR monopole antenna after matching the mhb+5g NR main antenna is as shown in fig. 9, and the isolation between the mhb+5g NR main antenna and the 5G NR monopole antenna is as shown in fig. 10 when there is a mhb+5g NR parasitic antenna, the principle is that the surface current distribution of the mhb+5g NR main antenna and the 5G NR monopole antenna in the N77 frequency band has orthogonal distribution, and the mhb+5g NR parasitic antenna reduces the crosstalk between the surface current distribution graph of the mhb+5g NR main antenna and the 5G NR monopole antenna in the N77 frequency band and the surface current of the 5G NR monopole antenna in the N78 frequency band.

As can be seen from the above, the present utility model provides an antenna structure for a 5G mobile terminal, in which an mhb+5g NR main antenna, a 5G NR monopole antenna, and an mhb+5g NR parasitic antenna are disposed in a 5G mobile terminal frame, the mhb+5g NR parasitic antenna can couple the mhb+5g NR main antenna to B/N1, B/N3, B/N40, B/N41, N77, and N78 frequency bands, and can reduce current crosstalk between the mhb+5g NR main antenna and the 5G NR monopole antenna, so that interference between antennas can be reduced in a limited space, loss caused by antenna switching can be reduced, good isolation and return loss can be maintained, total radiation efficiency of the whole antenna structure can be improved, a requirement of high-rate multi-data communication of a 5G mobile terminal 5 th-generation mobile communication system can be satisfied, a distributed frequency band can satisfy a communication requirement of a domestic frequency band, and problems of low total radiation efficiency, severe interference between antennas, and poor isolation in an antenna design of the 5G mobile terminal in the prior art can be solved.

The above embodiments are preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model, which includes but is not limited to the embodiments, and equivalent modifications according to the present utility model are within the scope of the present utility model.

Claims

1. An antenna structure for a 5G mobile terminal, characterized in that: including the MHB+5GNR main antenna, 5G NR monopole antenna and the MHB+5G NR parasitic antenna of mutually supporting, set up in the right side of 5G mobile terminal is at the side of the upper right corner frame, MHB+5G NR main antenna 5G NR monopole antenna 5G NR parasitic antenna respectively with the main control circuit board electricity in the 5G mobile terminal is connected, MHB+5G NR main antenna sets up in the upper frame of 5G mobile terminal and is close to the right side frame, 5G NR monopole antenna set up in the right side frame of 5G mobile terminal and be close to the upper frame, MHB+5G NR parasitic antenna set up in MHB+5G NR main antenna with between the 5G NR parasitic antenna and each other do not contact, MHB+5G NR parasitic antenna is whole closely laminated in the right side of 5G mobile terminal is inboard, MHB+5G NR parasitic antenna is close to be equipped with the antenna switch in 5G NR monopole antenna's one end, MHB+5G NR parasitic antenna can couple 5 G+5G NR parasitic antenna can couple to MHB+5G 5GNR 5N/5N 4/5G parasitic antenna and MHN 1/N4/N5N/N4/N77.

2. The antenna structure for a 5G mobile terminal according to claim 1, wherein: the antenna comprises an MHB+5G NR parasitic antenna, wherein a parasitic antenna feed foot is arranged in one end of the MHB+5G NR parasitic antenna, which is close to the 5G NR monopole antenna, the antenna switch is fixedly arranged at the parasitic antenna feed foot, a parasitic antenna feed point for leading out signals is arranged in one end of the MHB+5G NR parasitic antenna, which is close to the MHB+5G NR main antenna, and the parasitic antenna feed point extends from the MHB+5G NR parasitic antenna to the inside of the 5G mobile terminal.

3. The antenna structure for a 5G mobile terminal according to claim 2, wherein: the main antenna feeding pin is arranged in one end, far away from the MHB+5G NR parasitic antenna, of the MHB+5G NR main antenna, the main antenna feeding point used for leading out signals is arranged in one end, close to the MHB+5G NR parasitic antenna, of the MHB+5G NR main antenna, and the main antenna feeding pin and the main antenna feeding point extend from the MHB+5G NR main antenna to the inside of the 5G mobile terminal.

4. An antenna structure for a 5G mobile terminal according to claim 3, characterized in that: monopole antenna feed pins are arranged in one end, far away from the MHB+5G NR parasitic antenna, of the 5G NR monopole antenna, monopole antenna feed points used for leading out signals are arranged in one end, close to the MHB+5G NR parasitic antenna, of the 5G NR monopole antenna, and the monopole antenna feed pins and the monopole antenna feed points extend from the 5G NR monopole antenna to the inside of the 5G mobile terminal.

5. The antenna structure for a 5G mobile terminal of claim 4, wherein: the length of the MHB+5G NR parasitic antenna is selected to be 1/8 to 1/2 of the wavelength length corresponding to the frequency of 1.8GHz in the B3 frequency band.

6. The antenna structure for a 5G mobile terminal of claim 5, wherein: the length of the MHB+5G NR main antenna is selected to be 1/8 to 1/2 of the wavelength length corresponding to the frequency of 2.09GHz in the B1 frequency band.

7. The antenna structure for a 5G mobile terminal of claim 6, wherein: the length of the 5G NR monopole antenna is selected from 1/8 to 1/2 of the length of the corresponding wavelength of the 3.3GHz frequency in the N77 frequency band.

8. The antenna structure for a 5G mobile terminal of claim 7, wherein: the length of the MHB+5G NR parasitic antenna can be changed by accessing capacitance and/or inductance into the MHB+5G NR parasitic antenna, and the MHB+5G NR main antenna is coupled to the B/N1, B/N3, B/N40, B/N41, N77 and N78 frequency bands.

9. The antenna structure for a 5G mobile terminal of claim 8, wherein: the distance between the MHB+5GNR parasitic antenna and the MHB+5GNR main antenna is less than or equal to 0.5mm and less than or equal to 5mm, and the distance between the MHB+5GNR parasitic antenna and the 5G NR monopole antenna is less than or equal to 0.5mm and less than or equal to 5mm.

10. The antenna structure for a 5G mobile terminal of claim 9, wherein: the working frequency band of the MHB+5G NR main antenna comprises B/N1:2.11GHz-2.17GHz, B/N3:1.8GHz-1.88GHz, B/N40:2.3GHz-2.4GHz, B/N41:2.496GHz-2.690GHz, N77:3.3GHz-4.2GHz and N78:3.3GHz-3.8GHz; the working frequency band of the MHB+5G NR parasitic antenna comprises B/N1:2.11GHz-2.17GHz, B/N3:1.8GHz-1.88GHz, B/N40:2.3GHz-2.4GHz, B/N41:2.496GHz-2.690GHz, N77:3.3GHz-4.2GHz and N78:3.3GHz-3.8GHz; the working frequency band of the 5G NR monopole antenna comprises N77:3.3GHz-4.2GHz and N78:3.3GHz-3.8GHz.