WO2014194588A1

WO2014194588A1 - Antenna system and terminal

Info

Publication number: WO2014194588A1
Application number: PCT/CN2013/083841
Authority: WO
Inventors: 田超; 刘洋; 舒超凡
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-06-05
Filing date: 2013-09-18
Publication date: 2014-12-11
Also published as: CN104218327A

Abstract

Disclosed are an antenna system and a terminal for improving the isolation between antennas of a multi-antenna system. The antenna system of the present invention comprises at least two antennas, and also comprises: a first metal arm, the first metal arm passing between any first antenna and a second antenna of the at least two antennas and surrounding the first antenna by half; and a second metal arm, the second metal arm passing between the first antenna and the second antenna and surrounding the second antenna by half. Meanwhile, a groove is arranged between the two metal arms. By using the technical solution of the present invention, the isolation between antennas can be effectively improved, which is adaptable to technical requirements for a current multi-antenna system.

Description

Antenna system and terminal

The present invention relates to the field of wireless antennas, and more particularly to an antenna system and a terminal. Background technique

MIMO (Multi-Input Multiple-Output) or multi-shot multi-receiver antenna technology is a major breakthrough in antenna technology in the field of wireless mobile communications. This technology can double the capacity and spectrum utilization of a communication system without increasing bandwidth, and is a key technology that must be adopted in a new generation of mobile communication systems. MIMO technology allows multiple antennas to simultaneously transmit and receive multiple spatial streams, and is capable of distributing signals to or from different spatial orientations. The application of multiple antenna systems allows parallel data streams to be transmitted simultaneously. At the same time, using multiple antennas at the transmitting end or the receiving end can significantly overcome the fading of the channel and reduce the bit error rate.

However, in the terminal device, especially the handheld terminal is limited by the appearance and size of the product, the implementation of multiple antennas in the terminal product has certain difficulty. In order to solve this technical problem, the traditional layout is that the position of the antenna is placed as far as possible, and the isolation of the antenna is large enough, so that the layout can achieve a certain effect. However, the current appearance requirements of terminal products are getting higher and higher, and the miniaturization of products has become an inevitable trend in the future. This stipulates that it is ideal to place the distance between the antennas, and the isolation of the antenna cannot meet the requirements. Since the physical distance between the antenna and the antenna is very close, interference between the antenna and the antenna inevitably occurs.

Therefore, there are technical problems in the prior art how to implement a multi-antenna system with a small physical size. Summary of the invention

The embodiments of the present invention provide an antenna system and a terminal, which are used to solve the technical problem of how to implement a multi-antenna system in a small physical size in the prior art. To achieve the above objective, according to an aspect of an embodiment of the present invention, an antenna system is provided, and the following technical solutions are adopted:

The antenna system, including at least two antennas, further includes:

a first metal arm, the first metal arm passing between any one of the at least two antennas and the second antenna, and half surrounding the first antenna; the second metal arm, the second A metal arm passes between the first antenna and the second antenna and half surrounds the second antenna.

Preferably, a groove is disposed between the first metal arm and the second metal arm, the groove is for spacing the first metal arm and the second metal arm.

Preferably, the length of the trench is one quarter of the wavelength.

Preferably, the width of the groove is adjustable.

Preferably, the first metal arm and the second metal arm are both L-shaped.

Preferably, the first antenna and the second antenna respectively have independent feeding points, and may also adopt a coupling feeding mode.

According to still another aspect of the embodiments of the present invention, a terminal is provided, and the following technical solution is adopted:

The terminal includes the antenna system described above.

According to still another aspect of an embodiment of the present invention, a terminal is provided, and the following technical solution is adopted:

The terminal includes four antennas, and the four antennas are respectively located at four corners of the printed circuit board PCB of the terminal; the terminal further includes: a first metal arm, the first metal arm passes through the Between the first antenna and the second antenna of the four antennas, and half surrounding the first antenna; a second metal arm, the second metal arm passing through the first antenna of the four antennas and the Between the second antennas, and half surrounding the second antenna; a third metal arm, the third metal arm passing between the third antenna and the fourth antenna of the four antennas, and partially enclosing the a third antenna; a fourth metal arm passing between a third antenna of the four antennas and the fourth antenna, and half surrounding the fourth antenna. Preferably, a first trench is disposed between the first metal arm and the second metal arm, the first trench is used to separate the first metal arm and the second metal arm; A second groove is disposed between the third metal arm and the fourth metal arm, and the second groove is configured to partition the third metal arm from the fourth metal arm.

The embodiment of the invention effectively improves the isolation between the antennas by providing the metal arms of the semi-surrounding antennas, solves the interference problem between the multiple antennas, and satisfies the requirements for miniaturization of the terminal products such as mobile phones. DRAWINGS

The drawings are intended to provide a further understanding of the embodiments of the invention, and are intended to be a In the drawing:

1 is a schematic structural diagram of an antenna system according to Embodiment 1 of the present invention;

2 is a schematic structural diagram of an antenna system according to Embodiment 2 of the present invention;

3 is a diagram showing an isolation curve of a first antenna and a second antenna in an original state in an antenna system according to Embodiment 2 of the present invention;

Figure 4 is a diagram showing the isolation curves of the first antenna and the second antenna in the antenna system according to the second embodiment of the present invention in the state of the embodiment of the present invention. detailed description

The embodiments of the present invention are described in detail below with reference to the drawings, but the embodiments of the present invention can be implemented in various different ways as defined and covered by the claims.

FIG. 1 is a schematic structural diagram of an antenna system according to Embodiment 1 of the present invention.

As shown in FIG. 1 , an antenna system includes at least two antennas, a first antenna 1 and a second antenna 2, the antenna system further includes: a first metal arm 5, the first metal arm 5 passing through the first antenna 1 Between the second antenna 2 and the second antenna 1; the second metal arm 10, the second A metal 10 arm passes between the first antenna 1 and the second antenna 2 and partially surrounds the second antenna 2.

In this embodiment, the metal arm that surrounds the antenna is disposed between the two antennas, so that the isolation between the two antennas reaches the setting requirement.

Preferably, a first groove 6 is provided between the first metal arm 5 and the second metal arm 10, the first groove 6 is configured to separate the first metal arm 5 from the Second metal arm 10.

In the present embodiment, the isolation between the two antennas can be further increased by providing a groove between the two metal arms.

Preferably, the length of the first trench 6 is one quarter of the wavelength.

Referring to FIG. 1, two metal arms are taken from the main ground of the PCB 9, and the two arms are slotted. The length of the slot can be a quarter wavelength, or about a quarter wavelength, and the width is It can be adjusted according to the performance of the antenna to improve the overall performance of the antenna system.

Preferably, the first metal arm 5 and the second metal arm 10 are both L-shaped.

As shown in Fig. 1, the metal grounds of the first antenna 1 and the second antenna 2 each adopt an L-shaped semi-surrounding structure. Two L-shaped metal arms are drawn from the main ground of the entire PCB 9, and the arm length and arm width of the L-shaped metal ground can be adjusted to match the performance of the antenna to improve the isolation.

Preferably, the first antenna 1 and the second antenna 2 respectively have feeding points.

Preferably, the feeding point of the first antenna 1 is located away from the first metal arm 5, and the feeding point of the second antenna 2 is located away from the second metal arm 10.

Referring to FIG. 1 , the antennas are respectively fed on both sides 7 . At this time, although the first antenna 1 and the second antenna 2 are still in a common structure, due to the use of the semi-enclosed ground and the slotted isolation technology, the two antennas have been greatly weakened. The influence of ground current between the people is greatly improved.

Embodiments of the present invention provide a terminal, including the antenna system described above.

The embodiment of the present invention further provides a terminal. As shown in FIG. 2, the terminal includes four antennas, and the four antennas are respectively located at four corners of the printed circuit board PCB 9 of the terminal. The terminal further includes a first metal 5, the first metal arm 5 passing through a first one of the four antennas 1 and the second antenna 2, and half surrounding the first antenna 1; the second metal arm 10, the second metal arm 10 passing through the first antenna 1 and the second of the four antennas Between the antennas 2, and half surrounding the second antenna 2; a third metal arm 11, the third metal arm 11 passing between the third antenna 3 and the fourth antenna 4 of the four antennas, and Half surrounded by the third antenna 3; a fourth metal arm 12 passing between the third antenna 3 and the fourth antenna 4 of the four antennas, and semi-enclosed Fourth antenna 4.

Preferably, a first groove 6 is provided between the first metal arm 5 and the second metal arm 10, the first groove 6 is configured to separate the first metal arm 5 from the a second metal arm 10; a second groove 13 is disposed between the third metal arm 11 and the fourth metal arm 12, and the second groove 13 is used to partition the third metal arm 11 And the fourth metal arm 12.

The above embodiment is a wireless access terminal with a size of 140mm*60mm, working in the LTE frequency band, supporting MIMO technology, requiring four antennas, and isolation design between the four antennas is a key technology. Limited by the size of the PCB 9, the isolation of the antenna cannot be improved by pulling the physical position between the antennas. As shown in FIG. 2, four antennas are respectively placed at the four corners of the PCB 9, and the second antenna 2 and the third antenna 3 are separated by a long distance, so that the first antenna 1 and the first antenna are the same. The three antennas 3, the second antenna 2 and the fourth antenna 4 have a relatively wide isolation, and can directly meet the requirements without any measures. The isolation between the first antenna 1 and the second antenna 2, and between the third antenna 3 and the fourth antenna 4 is a difficulty in the design.

If no other measures are taken, take 960Mhz as an example to test the isolation between the first antenna 1 and the second antenna 2 as -6.7dB according to the actual test. The curve is as shown in FIG. 3, and the second antenna 2 and the third antenna 3 are shown. The isolation between the two is -21dB, the isolation between the third antenna 3 and the fourth antenna 4 is -7.2dB, the isolation between the first antenna 1 and the third antenna 3, and between the second antenna 2 and the fourth antenna 4 are both At around -20 dB. The isolation between the two antennas is generally required to be about 15 dB, so that the isolation between the first antenna 1 and the second antenna 2, and between the third antenna 3 and the fourth antenna 4 is obviously not satisfactory.

The isolation is improved by an L-type semi-enclosed isolation scheme, as shown in Figure 2, the first antenna 1 The metal ground of the second antenna 2 is each formed with an L-shaped half-surrounding structure. An L-shaped first metal arm 5 and a second metal arm 10 are drawn from the main ground of the entire PCB 9, and the two arms are slotted and cut, the length of the slot is about a quarter wavelength, and the width is adjusted according to the performance of the antenna. . The arm length and arm width of the L-shaped metal ground can be adjusted to match the performance of the antenna. The antennas are fed 7 on both sides. The third antenna 3 and the fourth antenna 4 can employ the same technique to improve the isolation.

At this time, according to the actual test, after using this technology, the isolation between the first antenna 1 and the second antenna 2 reaches -23.6 dB, which can be seen in FIG. 4, which is improved by about 16 dB on the basis of the previous one, and basically satisfies the isolation. Requirements.

For antennas operating in different frequency bands, the impedance bandwidth of the antenna can be adjusted by the antenna matching, feeding position, slot size, arm width of the L-shaped metal arm, and arm length.

It should be noted that the wireless device includes but is not limited to a mobile phone, and may also be applied to all places where the antenna technology can be applied, such as wireless access.

The above description is only one embodiment of the present invention applied to the wireless access product, and any modifications made in the slot size, the arm width of the L-shaped metal arm, the arm length, etc. within the spirit and principles of the method. , equivalent replacement, improvement, etc., should be included in the protection of the present invention.

Claims

Claim

An antenna system comprising at least two antennas, further comprising:

a first metal arm, the first metal arm passing between any one of the at least two antennas and the second antenna, and half surrounding the first antenna;

a second metal arm, the second metal arm passing between the first antenna and the second antenna, and half surrounding the second antenna.

The antenna system according to claim 1, wherein a groove is provided between the first metal arm and the second metal arm, the groove is for spacing the first metal arm and The second metal arm.

The antenna system according to claim 2, wherein the length of the groove is one quarter of a wavelength.

4. The antenna system according to claim 2, wherein a width of the groove is adjustable.

The antenna system according to claim 1, wherein the first metal arm and the second metal arm are both L-shaped.

6. A terminal comprising the antenna system of any one of claims 1 to 5.

A terminal comprising four antennas, the four antennas being respectively located at four corners of the printed circuit board PCB of the terminal; the terminal further comprising:

a first metal arm, the first metal arm passing between the first antenna and the second antenna of the four antennas, and half surrounding the first antenna;

a second metal arm, the second metal arm passing between the first antenna of the four antennas and the second antenna, and half surrounding the second antenna;

a third metal arm, the third metal arm passing between the third antenna and the fourth antenna of the four antennas, and half surrounding the third antenna;

a fourth metal arm, the fourth metal arm passing between the third antenna and the fourth antenna of the four antennas, and half surrounding the fourth antenna.

The terminal according to claim 7, wherein a first groove is disposed between the first metal arm and the second metal arm, and the first groove is used to separate the first a metal arm and the second metal arm;

A second groove is disposed between the third metal arm and the fourth metal arm, and the second groove is for spacing the third metal arm from the fourth metal arm.