CN110931973A

CN110931973A - Terminal device

Info

Publication number: CN110931973A
Application number: CN201811102825.9A
Authority: CN
Inventors: 李渭
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2018-09-20
Filing date: 2018-09-20
Publication date: 2020-03-27
Also published as: WO2020057236A1

Abstract

The invention discloses a terminal, comprising: a main board; an antenna mount; the first antenna comprises a first middle grounding isolation wire, a first radiation antenna and a first side grounding isolation wire, wherein the first radiation antenna is positioned between the first middle grounding isolation wire and the first side grounding isolation wire, and the first middle grounding isolation wire and the first side grounding isolation wire are simultaneously grounded; the second antenna is arranged on the antenna bracket and comprises a second middle grounding isolation line, a second radiation antenna and a second side grounding isolation line, the second radiation antenna is positioned between the second middle grounding isolation line and the second side grounding isolation line, and the second middle grounding isolation line and the second side grounding isolation line are simultaneously grounded; the first intermediate grounding isolation line and the second intermediate grounding isolation line are positioned between the first radiating antenna and the second radiating antenna. The technical scheme of the invention effectively improves the isolation between the antennas in the terminal.

Description

Terminal device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a terminal.

Background

With the rapid development of mobile communication, the development of low-frequency band spectrum resources is mature, and the remaining low-frequency band spectrum resources cannot meet the peak rate requirement of 10Gbps in the 5G era, so that the available spectrum resources need to be found on the millimeter wave band in the future 5G system. The millimeter wave technology, which is one of the 5G key technologies, has become the focus of research in each party of the current standard organization and industry chain, and meanwhile, the corresponding 5G terminal is also in further tightening implementation, and the 5G millimeter wave has the characteristics of high directivity, large space loss and the like, so that the traditional layout form of respectively arranging the main antenna and the diversity antenna at the two ends of the mainboard cannot meet the requirement of 5G at present, and therefore, a terminal product can arrange a corresponding mimo (multiple input multiple output) antenna system around the terminal product, but also needs to be further compatible with the related product frequency bands of 4G and 3G, and therefore, more mimo antennas, 3G main diversity antennas, 4G diversity antennas and Wifi antennas can be arranged at the edge of the terminal.

Compared with a 4G terminal, the number of the antennas of the 5G terminal is obviously increased, the distance between the two antennas is obviously short, and the antennas are mimo antennas with the same frequency, so that mutual interference is generated inevitably, the antenna radiation effect is influenced, and the terminal speed is obviously reduced. Therefore, how to ensure the isolation index between every two antennas becomes an important factor for reasonable design of the 5G terminal antenna.

In the present phase, in the design of the terminal antenna, the improvement of the isolation index according with the actual situation mainly depends on the following measures:

1. increasing the distance between the two antennas. The measure is greatly influenced by clearance area, and because 5G corresponds to a higher frequency band, larger antenna clearance can not be provided during antenna layout to ensure the radiation efficiency of the antenna, and meanwhile, enough distance is provided to ensure the isolation index between the two antennas. Because the whole antenna layout is connected with each other pairwise, if the distance between two mimo antennas is increased, the distance between the two mimo antennas and other antennas is necessarily reduced, and the isolation degree is also deteriorated, so that in the 5G terminal antenna layout, the isolation degree problem cannot be well solved by means of a measure of increasing the distance between the two antennas.

2. Two adjacent antennas adopt different antenna forms. The method is verified in the early stage, the isolation improvement effect is not very obvious, and when the isolation measure in the early stage is verified, based on a band41 frequency band, the isolation between two monopole antennas, one monopole-one IFA (inverted F) antenna and one monopole-one loop antenna are verified respectively, wherein the isolation between the two monopole antennas is-10 dB, the isolation between one monopole-one IFA antenna is-12 dB and the isolation between one monopole-one loop antenna is-11 dB. From the verification situation, the isolation improvement effect is not obvious.

3. The two antenna feed points and the radiator are orthogonally arranged. The measure is greatly influenced by the space and the layout of the antennas, and a plurality of mimo antennas are arranged on the side of the terminal, so that the orthogonal arrangement of the antennas cannot be realized.

4. And a gap is added between the two antenna feed points on the main board. In consideration of the actual design of the final terminal, the slotting measure on the main board can cause the design of circuits such as a radio frequency baseband and the like to be impossible to realize, so that the measure can not be applied to the actual design.

5. Reducing the radiation efficiency of one antenna. The measures are mainly taken for reducing the interference of the diversity antenna to the main antenna and properly reducing the efficiency of the diversity antenna and ensuring the radiation of the main antenna to reach the standard when the 4G terminal is designed, but for a mimo antenna system, the main antenna and the diversity antenna are not distinguished, so that the radiation efficiency of each antenna is required to be optimal to prevent the radiation efficiency between the mimo antennas from being greatly different and the uplink and download rates of the terminal are inevitably influenced.

6. A T-shaped grounding isolation wall is adopted between the two antennas. A T-shaped grounding isolation wall is added between the antenna clearance area and the two antennas, the two antennas are positioned on two sides of the T-shaped isolation, and the isolation between the two mimo antennas and other antennas cannot be guaranteed by the aid of the measures. In addition, this measure is only comparatively effective to monopole antenna, and to IFA antenna or loop antenna, the isolation promotes unobviously, and in addition, the T shape isolation wall of this measure needs the line of broad to promote the isolation effectively, and this under the less condition of headroom, must occupy more space, influences normal radiation and walks the line.

7. T-shaped grounding isolation and main board slotting. The measure is that on the basis of the T-shaped isolation wall, gaps are added. The said measure has the disadvantage of T-shaped isolation wall, and needs to open slot in the middle of T-shaped grounding, the length of the slot must exceed the position of two antenna feed points, so it is inevitable to open slot on the circuit main board, which results in that the circuit design of radio frequency base band, etc. can not be realized.

8. A decoupling balance line is adopted between the two antennas, and isolation indexes aiming at different frequency bands are improved by changing the electrical length of a neutralization line between the two antennas. The measures need to be combined with specific antenna working frequency ranges and working forms, different balance wires among two antennas are debugged, the clearance wire routing area required by the balance wires among the two antennas is increased, in addition, the form of the balance wires is flexible, how to select the proper balance wires to ensure effective improvement of isolation indexes is difficult, in addition, decoupling networks need to be added in many balance wire measures, corresponding electric elements such as inductors and capacitors are added, and the measures are difficult to realize in a 5G terminal with small clearance.

By combining the above analysis, the conventional measures for improving the antenna isolation are correspondingly limited in the 5G terminal, and the 5G antenna isolation index cannot be really and effectively improved.

Disclosure of Invention

The invention mainly aims to provide a terminal, aiming at improving the isolation of an antenna in the terminal.

To achieve the above object, the present invention provides a terminal, comprising: a main board; the antenna bracket is mounted on the main board; the first antenna is arranged on the antenna bracket and comprises a first middle grounding isolation wire, a first radiation antenna and a first side grounding isolation wire, the first radiation antenna is positioned between the first middle grounding isolation wire and the first side grounding isolation wire, and the first middle grounding isolation wire and the first side grounding isolation wire are grounded simultaneously; the second antenna is arranged on the antenna bracket and comprises a second middle grounding isolation line, a second radiation antenna and a second side grounding isolation line, the second radiation antenna is positioned between the second middle grounding isolation line and the second side grounding isolation line, and the second middle grounding isolation line and the second side grounding isolation line are simultaneously grounded; the first intermediate ground isolation line and the second intermediate ground isolation line are located between the first radiating antenna and the second radiating antenna.

Optionally, in the terminal, both sides of the main board have feed points connected to the first intermediate ground isolation line, and are connected through via holes; and/or the two sides of the mainboard are provided with feed points connected with the second middle grounding isolation line and are connected through via holes.

Optionally, in the terminal, the first side ground isolation line is connected to the first middle ground isolation line; and/or the second side ground isolation line is connected to the second intermediate ground isolation line.

Optionally, in the terminal, the first side ground isolation line is located on a maximum radiation surface of the first radiation antenna; and/or the second side ground isolation line is positioned on the maximum radiation surface of the second radiation antenna.

Optionally, in the terminal, the first intermediate ground isolation line is connected to the second intermediate ground isolation line.

Optionally, in the terminal, the first radiating antenna and the first intermediate ground isolation line are disposed on planes with different heights on the antenna support; and/or the second radiation antenna and the second intermediate ground isolation line are arranged on planes with different heights on the antenna support.

According to the above technical solutions, it can be known that the terminal of the present invention has at least the following advantages:

according to the invention, the grounding branch sections are added between the two antennas, and the middle of the two antennas and the two sides of the antenna wire are simultaneously grounded and isolated, so that the normal radiation wire of the antenna is thoroughly isolated, meanwhile, the coupling effect between the two antennas and other antennas is also prevented, and the isolation between the antennas in the terminal is effectively improved.

Drawings

Fig. 1 is a schematic diagram of an antenna arrangement in a terminal according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of an antenna arrangement within a terminal according to one embodiment of the present invention;

FIG. 3 is a schematic diagram of an antenna arrangement within a terminal according to one embodiment of the present invention;

FIG. 4 is a schematic diagram of an antenna arrangement within a terminal according to one embodiment of the present invention;

FIG. 5 is a schematic diagram of an antenna arrangement within a terminal according to one embodiment of the present invention;

FIG. 6 is a schematic diagram of an antenna arrangement within a terminal according to one embodiment of the present invention;

FIG. 7 is a schematic diagram of an antenna arrangement within a terminal according to one embodiment of the present invention;

FIG. 8 is a schematic diagram of an antenna arrangement within a terminal according to one embodiment of the present invention;

FIG. 9 is a schematic diagram of an antenna arrangement within a terminal according to one embodiment of the present invention;

fig. 10 is a schematic diagram of an antenna arrangement in a terminal according to an embodiment of the invention;

fig. 11 is a schematic diagram of an antenna arrangement within a terminal according to one embodiment of the invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the following description, suffixes such as "module", "part", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no peculiar meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.

As shown in fig. 1, one embodiment of the present invention provides a terminal, including:

a main board 110;

an antenna mount 120, the antenna mount 120 being mounted on the main board 110;

the first antenna 130 is disposed on the antenna bracket 120, the first antenna 130 includes a first middle ground isolation line 131, a first radiation antenna 132, and a first side ground isolation line 133, the first radiation antenna 132 is located between the first middle ground isolation line 131 and the first side ground isolation line 133, and the first middle ground isolation line 131 and the first side ground isolation line 133 are grounded at the same time;

the second antenna 140 is disposed on the antenna support 120, the second antenna 140 includes a second middle ground isolation line 141, a second radiation antenna 142, and a second side ground isolation line 143, the second radiation antenna 142 is located between the second middle ground isolation line 141 and the second side ground isolation line 143, and the second middle ground isolation line 141 and the second side ground isolation line 143 are grounded at the same time;

the first and second intermediate

ground isolation lines

131 and 141 are located between the first and

second radiation antennas

132 and 142.

In this embodiment, the antennas that can be disposed in the terminal are not limited to the first antenna and the second antenna, and more antennas may be disposed, and the isolation between the first antenna and the second antenna may be referred to when the antennas are isolated from each other.

In this embodiment, the first antenna 130 and the second antenna 140 may be in the form of monopole, IFA, loop and the like commonly used at present,

according to the technical scheme of the invention, the middle of the two antennas and two sides (namely side edges) of the antenna wiring are simultaneously grounded and isolated, so that the two antennas are thoroughly isolated by grounding, and the isolation between the two antennas and the adjacent antennas can be considered. As can be seen from fig. 1, the measure for improving the isolation in this embodiment does not have too much requirement on the normal clearance of the radiation antenna, and the measure for improving the isolation is only performed by the ground trace that is co-located with the radiation antenna.

Compared with the previous embodiment, in another embodiment of the present invention, the two sides of the main board 110 are both provided with a feed point connected to the first intermediate ground isolation line 131 and connected through a via hole; and/or both sides of the main board 110 are provided with feed points connected with the second intermediate ground isolation lines 141 and connected through via holes.

According to the technical scheme of the embodiment, the slot does not need to be formed in the mainboard for the intermediate ground isolation line of the two antennas, feed points can be arranged on two sides of the mainboard at the joint of the intermediate ground isolation line and the mainboard and are connected through the through hole, so that the two antennas can be separated by the intermediate ground isolation line, and the redundancy can be increased at the initial design stage of the mainboard by the aid of the measure.

Compared with the previous embodiments, in another embodiment of the present invention, the first side ground isolation line 133 is connected to the first middle ground isolation line 131; and/or the second side ground isolation line 143 is connected to the second intermediate ground isolation line 141.

According to the technical scheme of the embodiment, the grounding isolation at two sides (namely, the side edges) of the antenna wire is connected with the grounding isolation in the middle of the antenna, and the grounding isolation lines at two sides can be designed according to the specific radiation wire, so the measures of the technical scheme of the embodiment have great flexibility and can be debugged according to the environment where the antenna is located and the radiation wire.

Compared with the previous embodiment, in another embodiment of the present invention, the first side ground isolation line 133 is located on the maximum radiation surface of the first radiation antenna 132; and/or the second side ground isolation line 143 is located on the maximum radiation plane of the second radiation antenna 142.

In the technical scheme of this embodiment, practical debugging research finds that the ground isolation lines on both sides (i.e., lateral sides) of the antenna trace must be located on the maximum radiation surface of the antenna radiation trace, so that the isolation effect is more obvious.

In contrast to the previous embodiments, in another embodiment of the present invention, the first intermediate ground isolation line 131 is connected to the second intermediate ground isolation line 141.

In this embodiment, the ground isolation lines in the middle of the two antennas can be connected at a proper position, and the isolation routing is widened as much as possible on the premise of not affecting the normal radiation routing, so that the isolation can be further improved.

Compared with the previous embodiment, in another embodiment of the present invention, the first radiating antenna 132 and the first intermediate ground isolation line 131 are disposed on planes with different heights on the antenna support 120; and/or the second radiating antenna 142 and the second intermediate ground isolation line 141 are disposed on planes at different heights on the antenna mount 120.

According to the technical scheme of the embodiment, the height of the bracket where the middle isolation wire of the two antennas is located is adjusted at a proper position, even if the middle isolation wire and the maximum radiation surface routing of the antennas are not in the same plane, the isolation can be further improved.

Based on the technical scheme of the embodiment, the passive jig is carved according to the size of the 5G terminal for debugging and verification, and the following examples are realized. The design parameters of the antenna are as follows:

1. the overall size of the main board is 110mm by 60mm, the clearance of a single antenna is 22mm by 6mm, two antennas are closely arranged, the clearance of the two antennas is 5mm, and the distance between the two antenna feed points is 20 mm. And selecting a bracket antenna mode, wherein the overall height of the antenna bracket is 8mm, and the height of the bracket at the position of the grounding isolation line between the two antennas is 10 mm.

2. The working frequency band of the antenna is according to the SUB 6G frequency band, wherein band41 is 2496-2690 MHz;

n77, 3300-4200 MHz; n78, 3300-3800 MHz; 4400-5000 MHz in the number n79, and covering three frequency bands of n77, n78 and n79 from the view of working frequency band, the bandwidth which the antenna needs to cover is wide. On the premise of verifying isolation measures, the efficiency of two radiation antennas is preferentially debugged, and the isolation index is debugged on the premise that the efficiency is guaranteed to be more than 50%.

3. Firstly, an LTE band41 (2496-2690 MHz) frequency band is selected for verification, a monopole antenna is used, and as shown in fig. 2, the front routing of the single-frequency monopole antenna is realized, and the figure is a schematic diagram of a feed point and the front routing after the feed point and the front routing are added by adopting a monopole antenna form and grounding isolation lines in the middle and at two sides of the routing. The efficiency of the monopole antenna in the frequency band is 50% -55%. Fig. 3 is a schematic diagram of the back and bottom traces of the single-frequency monopole antenna, which is a schematic diagram of the back and bottom ground traces. In order to embody the technical effect of the invention to the maximum extent, the isolation environment of the two radiation antennas is changed into the worst state, namely the two radiation antennas select the monopole antennas with the mutually symmetrical wiring forms which are completely the same, thus before no measures are added, the isolation index is verified to be-6 dB at worst by S12, after the measures are added, the isolation is-16 dB at the least, and the conventional requirement of-15 dB is completely met.

4. The LTE band41 (2496-2690 MHz) frequency band is selected, the IFA antenna is used, if figure 4 shows that the top of the single-frequency IFA antenna is wired, the antenna adopts the form of the IFA antenna, and therefore the isolation lines on the two sides and the IFA antenna share the same grounding point. The efficiency of the IFA in the band41 frequency band is 50%. For example, fig. 5 shows a single-frequency IFA antenna bottom trace, in which the IFA antennas also use the same trace and have symmetrical positions, and before no measures are taken, the worst isolation is-9 dB, and the present invention is not used, but only a T-shaped isolation manner in the literature is used, and the isolation can only reach-12 dB, for analysis reasons, the IFA antenna mainly has a grounded branch, so that the two IFA antennas are grounded, and the current passing through the floor still affects the other antenna, therefore, according to the characteristics of the present invention, a middle isolation and two-side isolation are used, and the two middle isolation lines are connected together at the bottom, and the top surface of the middle isolation line is raised, so that the worst isolation can reach-15 dB or less, and the conventional requirements are met. In order to simultaneously verify the isolation effect of the three n77/n78/n79 bands, the S parameters of the IFA antenna are as shown in fig. 6 after being slightly adjusted. Curve 1 in the figure represents the return loss value of the radiating antenna 1, i.e. S11; curve 2 represents the return loss value of the radiating antenna 2, i.e. S22; curve 3 represents the isolation between antenna 1 and antenna 2, i.e., S21. As can be seen in FIG. 6, S21 results of four frequency bands, such as LTE band41 and n77/78/79, have all reached the requirement below-15 dB.

5. The selection of LTE band41 (2496-2690 MHz), n77 (3300-4200 MHz), and n78

In the (3300-3800 MHz) and n79 (4400-5000 MHz) frequency bands, a monopole antenna is used, as shown in fig. 7, the top surface of the multi-frequency monopole antenna is routed, and the monopole antenna is adopted, so that the frequency band coverage is wide, and especially the bandwidths of the three frequency bands n77, n78 and n79 reach nearly 1.7 GHz. Through monopole antenna optimization debugging, the efficiency of an LTE band41 antenna is 50%, and the efficiency of three frequency band antennas of n77, n78 and n79 is 50% -55%. Fig. 8 shows the back trace of the multi-frequency monopole antenna, the two radiation antennas still adopt the same trace and symmetrical form, and the bottom of the middle isolation line is grounded as shown in fig. 9.

Before any measures are not added, the frequency band of the isolation degree n79 of the two antennas is basically below-13 to-16 dB, the frequency bands n77 and n78 are between-10 to-16 dB, and the frequency band41 is at-11 dB, and the result is shown in figure 10. After the middle isolation and the two-side isolation measures are added and the height of the middle isolation line is raised, the overall frequency band isolation is below-15 dB, as shown in figure 11.

The three examples show that the isolation indexes of the frequency bands such as the 5G frequency band41, the n77, the n78 and the n79 are obviously improved, the antenna efficiency is not greatly influenced, the wiring forms are completely the same, and the defects caused by the isolation improving measures in the prior art are overcome. It is worth noting that after the radiation antenna is debugged, the measures of the present invention may generate frequency deviation to the previously debugged radiation antenna to affect the radiation efficiency of the antenna, so that the measures of the present invention need to be added to jointly optimize the previous radiation routing in combination with the antenna efficiency and isolation index

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A terminal, comprising:

a main board;

the antenna bracket is mounted on the main board;

the first antenna is arranged on the antenna bracket and comprises a first middle grounding isolation wire, a first radiation antenna and a first side grounding isolation wire, the first radiation antenna is positioned between the first middle grounding isolation wire and the first side grounding isolation wire, and the first middle grounding isolation wire and the first side grounding isolation wire are grounded simultaneously;

the second antenna is arranged on the antenna bracket and comprises a second middle grounding isolation line, a second radiation antenna and a second side grounding isolation line, the second radiation antenna is positioned between the second middle grounding isolation line and the second side grounding isolation line, and the second middle grounding isolation line and the second side grounding isolation line are simultaneously grounded;

the first intermediate ground isolation line and the second intermediate ground isolation line are located between the first radiating antenna and the second radiating antenna.

2. The terminal of claim 1,

two sides of the mainboard are provided with feed points connected with the first intermediate grounding isolation line and are connected through via holes; and/or

And the two sides of the mainboard are provided with feed points connected with the second intermediate grounding isolation line and are connected through via holes.

3. The terminal of claim 1,

the first side edge grounding isolation line is connected to the first middle grounding isolation line; and/or

The second side ground isolation line is connected to the second intermediate ground isolation line.

4. The terminal of claim 1,

the first side edge grounding isolation line is positioned on the maximum radiation surface of the first radiation antenna; and/or

The second side edge grounding isolation line is positioned on the maximum radiation surface of the second radiation antenna.

5. The terminal of claim 1,

the first intermediate ground isolation line is connected with the second intermediate ground isolation line.

6. The terminal of claim 1,

the first radiation antenna and the first middle grounding isolation line are arranged on planes with different heights on the antenna bracket; and/or

The second radiation antenna and the second middle grounding isolation line are arranged on planes with different heights on the antenna support.