WO2020057236A1

WO2020057236A1 - Terminal

Info

Publication number: WO2020057236A1
Application number: PCT/CN2019/095474
Authority: WO
Inventors: 李渭
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-09-20
Filing date: 2019-07-10
Publication date: 2020-03-26
Also published as: CN110931973A

Abstract

Disclosed is a terminal, comprising: a main board; an antenna support; a first antenna, comprising a first middle grounding isolation wire, a first radiation antenna, and a first side edge grounding isolation wire, wherein the first radiation antenna is located between the first middle grounding isolation wire and the first side edge grounding isolation wire, and the first middle grounding isolation wire and the first side edge grounding isolation wire are grounded at the same time; and a second antenna disposed on the antenna support and comprising a second middle grounding isolation wire, a second radiation antenna, and a second side edge grounding isolation wire, wherein the second radiation antenna is located between the second middle grounding isolation wire and the second side edge grounding isolation wire, and the second middle grounding isolation wire and the second side edge grounding isolation wire are grounded at the same time; wherein the first middle grounding isolation wire and the second middle grounding isolation wire are located between the first radiation antenna and the second radiation antenna.

Description

terminal

cross reference

The present invention claims the priority of a Chinese patent application filed with the Chinese Patent Office on September 20, 2018, with an application number of 201811102825.9 and an invention name of "terminal", the entire contents of which are incorporated herein by reference.

Technical field

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

Background technique

With the rapid development of mobile communications, the development of low-band spectrum resources has become very mature, and the remaining low-band spectrum resources can no longer meet the peak rate requirements of 10Gbps in the 5G era. Therefore, in the future, 5G systems need to find available spectrum in the millimeter wave band Resources. As one of the key technologies of 5G, millimeter-wave technology has become the focus of research by current standards organizations and industry chains. At the same time, the corresponding 5G terminals are also being further implemented. The 5G millimeter wave corresponds to some high directivity and large space loss. And other characteristics, so that the current traditional layout of the main and diversity antennas at the two ends of the motherboard can no longer meet the requirements of 5G, so terminal products will be arranged around the corresponding mimo (multiple-input multiple-output technology) antenna system, but at the same time It also needs to be further compatible with 4G and 3G related product frequency bands, so more mimo antennas and 3G and 4G main and diversity antennas and Wifi antennas will be arranged on the edge of the terminal.

Compared with 4G terminals, the number of 5G terminal antennas is significantly increased, and the distance between the two antennas is obviously closer, and many are mimo antennas at the same frequency. This will inevitably generate mutual interference, affect the antenna radiation effect, and make the terminal The rate drops significantly. Therefore, how to ensure the isolation index between two antennas has become an important factor for the reasonable design of 5G terminal antennas.

At this stage, in the design of the terminal antenna, the improvement of the isolation index in line with the actual situation mainly depends on the following measures:

1. Increase the distance between the two antennas. This measure is greatly affected by the headroom area. Because 5G corresponds to a higher frequency band, a larger antenna headroom will not be given in the antenna layout to ensure antenna radiation efficiency, and there is also a sufficient distance to ensure the distance between the two antennas. Isolation indicators. Because the entire antenna layout is connected in pairs, if the distance between the two mimo antennas is increased, the distance between the two mimo antennas and other antennas will inevitably decrease, and the isolation will also deteriorate. Therefore, in the 5G terminal antenna layout, the measure of increasing the distance between the two antennas cannot solve the isolation problem well.

2. Two adjacent antennas use different antenna forms. This measure was verified in the early stage, and the isolation improvement effect was not very obvious. During the verification of the previous isolation measure, based on the band 41 frequency band, two monopole antennas were verified, one monopole and one IFA (inverted F) antenna, one Isolation between a monopole and a loop antenna, where the isolation between two monopole antennas is -10dB, the isolation between a monopole and an IFA antenna is -12dB, and the isolation between a monopole and a loop antenna is -11dB . From the verification situation, the improvement effect of isolation is not obvious.

3. The two antenna feed points and the radiator are placed orthogonally. This measure is mainly affected by the antenna space and layout. Many mimo antennas are on the side of the terminal, and the antenna cannot be placed orthogonally.

4. Increase the gap between the two antenna feed points on the motherboard. This measure takes into account the actual design of the final terminal. The measures of slitting on the motherboard will cause circuit design such as radio frequency baseband to be impossible to implement, so this measure cannot be applied to the actual design.

5. Reduce the radiation efficiency of an antenna. This measure is mainly an expedient measure taken in the design of 4G terminals in order to reduce the interference of the diversity antenna to the main antenna, appropriately reduce the efficiency of the diversity antenna, and ensure that the main antenna's radiation meets the standards. However, for mimo antenna systems, the main antenna is not distinguished. Diversity antennas, therefore, it is required that the radiation efficiency of each antenna is optimal to prevent a large difference in radiation efficiency between mimo antennas, which will inevitably affect the uplink and download rate of the terminal.

6. A T-shaped ground separation wall is used between the two antennas. Add a T-shaped ground separation wall between the antenna clearance area and the two antennas. The two antennas are on both sides of the T-shaped isolation. This measure cannot guarantee the isolation between the two mimo antennas and other antennas. In addition, this measure is more effective only for monopole antennas, and for IFA antennas or loop antennas, the isolation is not significantly improved. In addition, the T-shaped partition wall of this measure requires a wider trace to effectively improve the isolation. When the headroom is small, it will inevitably occupy more space and affect the normal radiation routing.

7, T-shaped ground isolation plus slot on the motherboard. The measure is to increase the gap on the basis of the T-shaped partition wall. In addition to the shortcomings of the T-shaped partition wall described above, this measure also requires a slot in the middle of the T-shaped ground. The length of the slot must exceed the position of the two antenna feed points, so it is bound to open a slot on the circuit board, resulting in circuits such as RF baseband. Design cannot be achieved.

8. A decoupling balanced line is used between the two antennas, and the isolation index for different frequency bands is improved by changing the electrical length of the neutral line between the two antennas. This measure needs to combine specific antenna working frequency bands and working forms to debug different balance line routing between the two antennas, but the clearance area required to increase the balance line between the two antennas is large. In addition, the form of the balance line is more flexible. How to choose a suitable balance line to effectively improve the isolation index has greater difficulties. In addition, many balance line measures need to increase the decoupling network and corresponding electrical components such as inductors and capacitors. This is the case in 5G terminals with small headroom. It is also more difficult to achieve.

In combination with the above analysis, the existing conventional measures for improving the antenna isolation are subject to corresponding restrictions in 5G terminals, and it is impossible to effectively improve the 5G antenna isolation index.

Summary of the Invention

The main purpose of the present invention is to provide a terminal, which aims to improve the isolation of the antenna in the terminal.

To achieve the above object, the present invention provides a terminal including: a main board; an antenna bracket, the antenna bracket is mounted on the main board; a first antenna, the first antenna is provided on the antenna bracket, and the The first antenna includes a first intermediate ground isolation line, a first radiating antenna, and a first side ground isolation line. The first radiating antenna is located between the first intermediate ground isolation line and the first side ground isolation line. The first intermediate ground isolation line and the first side ground isolation line are simultaneously grounded; a second antenna, the second antenna is disposed on the antenna support, and the second antenna includes a second intermediate ground An isolation line, a second radiating antenna, and a second side ground isolation line, the second radiating antenna is located between the second middle ground isolation line and the second side ground isolation line, and the second middle ground The isolation line and the second side ground 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.

In an exemplary embodiment, on the two sides of the aforementioned terminal, the main board has feed points connected to the first intermediate ground isolation wire and are connected through vias; and / or the two sides of the main board have connections. The feed point of the second intermediate ground isolation line is connected through a via.

In an exemplary embodiment, in the aforementioned terminal, the first side ground isolation line is connected to the first intermediate ground isolation line; and / or the second side ground isolation line is connected to the second Middle ground isolation wire.

In an exemplary embodiment, in the foregoing terminal, the first side ground isolation line is located on a maximum radiation surface of the first radiating antenna; and / or the second side ground isolation line is located in the first The maximum radiation surface of the two-radiation antenna.

In an exemplary embodiment, in the aforementioned terminal, the first intermediate ground isolation line is connected to the second intermediate ground isolation line.

In an exemplary embodiment, in the foregoing terminal, the first radiating antenna and the first intermediate ground isolation line are disposed on planes of different heights on the antenna support; and / or the second radiating antenna and The second intermediate ground isolation line is disposed on planes of different heights on the antenna support.

BRIEF DESCRIPTION OF THE DRAWINGS

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

2 is a schematic diagram of an antenna arrangement in a terminal according to an embodiment of the present invention;

3 is a schematic diagram of an antenna arrangement in a terminal according to an embodiment of the present invention;

4 is a schematic diagram of an antenna arrangement in a terminal according to an embodiment of the present invention;

5 is a schematic diagram of an antenna arrangement in a terminal according to an embodiment of the present invention;

6 is a schematic diagram of an antenna arrangement in a terminal according to an embodiment of the present invention;

7 is a schematic diagram of an antenna arrangement in a terminal according to an embodiment of the present invention;

8 is a schematic diagram of an antenna arrangement in a terminal according to an embodiment of the present invention;

9 is a schematic diagram of an antenna arrangement in a terminal according to an embodiment of the present invention;

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

11 is a schematic diagram of an antenna arrangement in a terminal according to an embodiment of the present invention.

The realization of the purpose, functional characteristics and advantages of the present invention will be further explained with reference to the embodiments and the drawings.

detailed description

It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

In the following description, the use of suffixes such as “module”, “component”, or “unit” for indicating elements is merely for the benefit of the description of the present invention, and it has no unique meaning in itself. Therefore, "modules," "components," or "units" can be used in combination.

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

Motherboard 110;

An antenna bracket 120, which is mounted on the motherboard 110;

The first antenna 130 is disposed on the antenna support 120. The first antenna 130 includes a first intermediate ground isolation line 131, a first radiation antenna 132, and a first side ground isolation line 133. The first radiation antenna 132 is located at Between the first middle ground isolation line 131 and the first side ground isolation line 133, the first middle ground isolation line 131 and the first side ground isolation line 133 are simultaneously grounded;

The second antenna 140 is disposed on the antenna support 120. The second antenna 140 includes a second intermediate ground isolation line 141, a second radiation antenna 142, and a second side ground isolation line 143. The second radiation antenna 142 is located at Between the second middle ground isolation line 141 and the second side ground isolation line 143, the second middle ground isolation line 141 and the second side ground isolation line 143 are simultaneously grounded;

The first intermediate ground isolation line 131 and the second intermediate ground isolation line 141 are located between the first radiation antenna 132 and the second radiation antenna 142.

In this embodiment, the antennas that can be set in the terminal are not limited to the first antenna and the second antenna, and more antennas can be provided. For the case where two or more antennas are isolated from each other, reference may be made between the first antenna and the second antenna. Isolate the situation.

In this embodiment, the first antenna 130 and the second antenna 140 may be monopole, IFA, and loop antenna forms that are currently commonly used.

According to the technical solution of the present invention, the middle of the two antennas and both sides (ie, the sides) of the antenna wiring are grounded at the same time, so that the two antennas will be completely isolated by grounding, and the isolation between the two antennas and the side antennas can be taken into account at the same time. It can be seen from FIG. 1 that the measures taken to improve the isolation in this embodiment do not have too many requirements for the normal radiating antenna headroom, but only improve the isolation by using the grounding trace of the common bracket with the radiating antenna. Measures.

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

According to the technical solution of this embodiment, the middle ground isolation wire of the two antennas can be separated from the motherboard, and where the middle ground isolation wire is connected to the motherboard, feed points can be set on both sides of the motherboard and connected through vias. It can be ensured that the middle ground isolation wire separates the two antennas. This measure can increase redundancy in the initial stage of the motherboard design.

Compared with the foregoing embodiment, 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 middle area. Ground isolation line 141.

According to the technical solution of this embodiment, the ground isolation on both sides (ie, the sides) of the antenna wiring is connected to the ground isolation of the middle of the antenna. The ground isolation wires on both sides can be designed according to the specific radiation wiring, so the technical solution of this embodiment The measures have great flexibility and can be debugged according to the environment where the antenna is located and the radiation traces.

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

In the technical solution of this embodiment, through actual debugging research, it is found that the ground isolation wires on both sides (ie, sides) of the antenna trace must be located on the maximum radiation surface of the antenna radiation trace, so the isolation effect will be more obvious.

Compared with the foregoing embodiment, 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 wires in the middle of the two antennas can be connected at appropriate positions, and the isolation wires are widened as much as possible without affecting the normal radiation wiring, so that the isolation can be further improved.

Compared with the foregoing 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 of different heights on the antenna support 120; and / or the second radiating antenna 142 and The second intermediate ground isolation line 141 is disposed on planes of different heights on the antenna support 120.

According to the technical solution of this embodiment, the height of the bracket where the space between the two antennas is spaced is adjusted at an appropriate position, even if the space between the medium space and the antenna's maximum radiation plane is not in the same plane, which can further improve the isolation.

Based on the technical solution of the above embodiment, the passive fixture is carved and verified according to the 5G terminal size, and the following examples are implemented. The design parameters of the antenna are as follows:

1. The overall size of the main board is 110mm * 60mm, with a single antenna clearance of 22mm * 6mm. The two antennas are placed next to each other. The clearance between the two antennas is 5mm, and the distance between the two antenna feed points is 20mm. Select the bracket antenna method. The overall height of the antenna bracket is 8mm, and the height of the bracket at the ground isolation line between the two antennas is 10mm.

2. The working frequency of the antenna is in accordance with the SUB 6G frequency band, of which band 41: 2496 ～ 2690MHz; n77: 3300 ～ 4200MHz; n78: 3300 ～ 3800MHz; n79: 4400 ～ 5000MHz. From the working frequency band, it covers the three frequency bands n77, n78, and n79. , The antenna needs to cover a wide bandwidth. Before verifying the isolation measures, the efficiency of the two radiating antennas was debugged first, and the isolation index was debugged on the premise that the efficiency was above 50%.

3. First select the LTE band 41 (2496 ～ 2690MHz) frequency band for verification. A monopole antenna is used, as shown in Figure 2 for the single-frequency monopole antenna front wiring. The figure uses the form of a monopole antenna, plus the middle and wiring. Schematic diagram of the feed points and front wiring behind the ground isolation wires on both sides. The efficiency of the monopole antenna in this frequency band is 50% to 55%. Figure 3 shows the back and bottom traces of a single-frequency monopole antenna. This figure is a schematic diagram of ground traces on the back and bottom of the trace. In order to reflect the technical effect of the present invention to the greatest extent, the isolation environment of the two radiating antennas itself is changed to the worst state, that is, the two radiating antennas are selected as monopole antennas with exactly the same symmetrical routing form. The worst-case index of S12 is -6dB. After adding this measure, the worst point of isolation is -16dB, which fully meets the conventional requirement of -15dB.

4. Select the LTE band 41 (2496 ～ 2690MHz) frequency band and use the IFA antenna, as shown in Figure 4 for the top line of the single-frequency IFA antenna. This antenna is in the form of an IFA antenna, so the two isolated wires and the IFA antenna share the same ground point. IFA has a 50% efficiency in band 41. Figure 5 shows the bottom line of a single-frequency IFA antenna. In the figure, the IFA antenna also uses the same routing and symmetrical position. Before no measures are taken, the worst isolation is -9dB. The measures of the present invention are not used, but only Using the T-shaped isolation method in the literature, the isolation can only reach -12dB. The reason is mainly that the IFA antenna has a grounded branch. In this way, the two IFA antennas share the same ground, and the current through the floor will still affect the other antenna. Therefore, according to the characteristics of the present invention, it is necessary to adopt intermediate isolation and isolation on both sides, and simultaneously connect the two intermediate intervals offline at the bottom, and raise the top surface of the intermediate interval offline, so that the worst isolation can reach below -15dB. To meet routine requirements. In order to balance the verification of the isolation effects of the three bands of n77 / n78 / n79, after slightly adjusting the IFA antenna, its S parameters are shown in Figure 6. In the figure, curve 1 represents the return loss value of radiating antenna 1, namely S11; curve 2 represents the return loss value of radiating antenna 2, namely S22; curve 3 represents the isolation between antenna 1 and antenna 2, namely S21. It can be seen in Figure 6 that the S21 results of the four frequency bands such as LTE band 41 and n77 / 78/79 have reached the requirements of -15dB or less.

5. Select the LTE band 41 (2496 ～ 2690MHz), n77 (3300 ～ 4200MHz), n78 (3300 ～ 3800MHz) and n79 (4400 ～ 5000MHz) frequency bands, and use the monopole antenna, as shown in Figure 7 is the top surface of the multi-frequency monopole antenna The wiring uses a monopole antenna, and the frequency band covers a wide range. In particular, the bandwidth of the three frequency bands n77, n78, and n79 reaches nearly 1.7GHz. Through the optimization and debugging of the monopole antenna, the efficiency of the LTE band41 antenna is 50%, and the antenna efficiency of the three frequency bands n77, n78, and n79 is 50% to 55%. Figure 8 shows the wiring on the back of the multi-frequency monopole antenna. The two radiating antennas still use the same wiring and are symmetrical. The bottom of the middle isolation wire is grounded as shown in Figure 9.

Before any measures are taken, the n79 frequency band between the two antennas is basically below -13 to -16dB, the n77 and n78 frequency bands are between -10 to -16dB, and the band 41 frequency band is at -11dB. The results are shown in Figure 10. After adding intermediate isolation and isolation on both sides, and raising the intermediate interval offline height at the same time, the overall frequency band isolation is below -15dB, as shown in Figure 11.

Through the above three examples, it can be seen that the present invention has a significant improvement in the isolation index for the 5G band band 41, n77, n78, n79 and other bands, while it does not have a large impact on antenna efficiency, and uses a routing form Exactly the same form, overcomes the deficiencies brought by measures to improve isolation at this stage. It is worth noting that after the debugging of the radiating antenna is completed, adding the measures of the present invention may cause a frequency offset to the previously adjusted radiating antenna and affect the radiation efficiency of the antenna. Therefore, it is necessary to route the previous radiating wires after adding the measures of the present invention. Combined with antenna efficiency and isolation indicators for optimization.

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

In the present invention, a grounding stub is added between the two antennas, and the middle of the two antennas is isolated from both sides of the antenna wiring at the same time, which completely separates the normal radiation wiring of the antenna, and also prevents the two antennas from being separated from other antennas. The coupling effect effectively improves the isolation between antennas in the terminal.

It should be noted that, in this article, the terms "including", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, It also includes other elements not explicitly listed, or elements inherent to such a process, method, article, or device. Without more restrictions, an element limited by the sentence "including a ..." does not exclude that there are other identical elements in the process, method, article, or device that includes the element.

The sequence numbers of the foregoing embodiments of the present invention are only for description, and do not represent the superiority or inferiority of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods in the above embodiments can be implemented by means of software plus a necessary universal hardware platform, and of course, also by hardware, but in many cases the former is better. Implementation. Based on such an understanding, the technical solution of the present invention, in essence, or a part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, The optical disc) includes several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in the embodiments of the present invention.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above specific implementations, and the above specific implementations are only schematic and not restrictive. Those of ordinary skill in the art at Under the enlightenment of the present invention, many forms can be made without departing from the spirit of the present invention and the scope protected by the claims, and these all fall within the protection of the present invention.

Claims

A terminal, comprising:

Motherboard

An antenna bracket, which is mounted on the motherboard;

A first antenna, the first antenna being disposed on the antenna support, the first antenna including a first intermediate ground isolation line, a first radiating antenna, and a first side ground isolation line; the first radiating antenna is located at Between the first intermediate ground isolation line and the first side ground isolation line, the first intermediate ground isolation line and the first side ground isolation line are simultaneously grounded;

A second antenna, the second antenna being disposed on the antenna support, the second antenna including a second intermediate ground isolation line, a second radiation antenna, and a second side ground isolation line, the second radiation antenna being located at Between the second middle ground isolation line and the second side ground isolation line, the second middle ground isolation line and the second side ground isolation line are grounded at the same time;

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.
The terminal according to claim 1, wherein:

Both sides of the main board have feed points connected to the first intermediate ground isolation wire and are connected through vias; and / or

Feeding points connected to the second intermediate ground isolation line are provided on both sides of the main board, and are connected through via holes.
The terminal according to claim 1, wherein:

The first side ground isolation line is connected to the first intermediate ground isolation line; and / or

The second side ground isolation line is connected to the second intermediate ground isolation line.
The terminal according to claim 1, wherein:

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 located on a maximum radiation surface of the second radiation antenna.
The terminal according to claim 1, wherein:

The first intermediate ground isolation line is connected to the second intermediate ground isolation line.
The terminal according to claim 1, wherein:

The first radiating antenna and the first intermediate ground isolation line are disposed on planes of different heights on the antenna support; and / or

The second radiating antenna and the second intermediate ground isolation line are disposed on planes of different heights on the antenna support.