CN211700569U

CN211700569U - Antenna with adjustable isolation

Info

Publication number: CN211700569U
Application number: CN202020343395.6U
Authority: CN
Inventors: 谢驰
Original assignee: SHENZHEN CHINO-E COMMUNICATION CO LTD
Current assignee: SHENZHEN CHINO-E COMMUNICATION CO LTD
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-10-16
Anticipated expiration: 2030-03-18

Abstract

The utility model provides an antenna of adjustable isolation, the antenna includes first antenna, second antenna, keeps apart minor matters and tuning switch, first antenna is established in one side of keeping apart minor matters, the second antenna is established in the opposite side of keeping apart minor matters, the first antenna with the structure of second antenna is the same; and the isolation branch is grounded through the tuning switch. Different matching circuit can be inserted through the tuning switch who connects isolation minor matters, and the size that changes tuning switch matching circuit can the dynamic adjustment keep apart the operating frequency of minor matters, the utility model discloses the reality has the advantage of dynamic promotion antenna at different frequency performance.

Description

Antenna with adjustable isolation

Technical Field

The utility model belongs to the technical field of the antenna, especially, relate to an antenna of adjustable isolation.

Background

With the continuous development of mobile internet of things and internet technology, the demand of people on communication networks is continuously increased, and therefore a fifth generation communication technology is produced; the fifth generation communication technology has the characteristics of high speed, wide connection, low time delay, high reliability and the like, and the key technology mainly relates to a large-scale antenna array, an ultra-dense network, novel waveform multiplexing and channel coding and decoding, full duplex communication, a non-orthogonal multiple access technology, high-frequency-band communication and the like; the mobile terminal can improve the communication frequency of the antennas on the original basis and greatly increase the number of the antennas in order to realize higher transmission rate, but the distance of each antenna is determined to be close when the antennas are distributed due to the size of the mobile terminal, so that the antennas are influenced mutually and the performance of the antennas is reduced.

The existing antenna design mostly supports the scattered layout of antennas in the same frequency band, and the distance between the antennas is increased to improve the performance of the antennas; however, because the number of the antennas is large and the frequencies are close, the distance between the two antennas is difficult to ensure that the antennas do not influence each other, especially at the frequency of 1.7 GHz-6 GHz.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above problems, the utility model provides an antenna of dynamic promotion antenna at the adjustable isolation of different frequency performance to solve the defect that exists among the prior art.

In order to achieve the purpose, the utility model adopts the following technical proposal:

an antenna with adjustable isolation degree comprises a first antenna, a second antenna, an isolation branch and a tuning switch, wherein the first antenna is arranged on one side of the isolation branch, the second antenna is arranged on the other side of the isolation branch, and the first antenna and the second antenna have the same structure; the isolation branch is grounded through the tuning switch.

To the improvement of the utility model, keep apart the minor matters for T font keeps apart the minor matters.

To the improvement of the present invention, the distance between the first antenna and the second antenna is 5 mm.

To the improvement of the present invention, the first antenna includes a long branch and a short branch.

To the improvement of the utility model, the long branch festival resonance is at 2.4GHz frequency, and the short branch festival resonance is at 4.4GHz frequency.

Compared with the prior art, the beneficial effects of the utility model are that:

Drawings

Fig. 1 is a schematic structural diagram of an antenna with adjustable isolation according to the present invention;

fig. 2 is a diagram of S11, i.e., reflection coefficients, of the respective antennas;

fig. 3 is a diagram of S21, i.e., isolation (transmission coefficient between two antennas), of each antenna;

FIG. 4 is a schematic diagram of the efficiency of each antenna;

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or assembly referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.

As shown in fig. 1 and fig. 2, the antenna with adjustable isolation provided in the present invention includes a first antenna 1, a second antenna 2, an isolation branch 3 and a tuning switch 4, wherein the first antenna 1 is disposed on one side of the isolation branch 3, the second antenna 2 is disposed on the other side of the isolation branch 3, and the first antenna 1 and the second antenna 2 have the same structure; the isolation branch 3 is grounded through the tuning switch 4. The isolation branch 3 is arranged between the first antenna 1 and the second antenna 2 and connected with the tuning switch 4 to work, and the tuning switch 4 enables the isolation branch 3 to resonate at different frequencies by connecting different components in series, so that the mutual influence between the first antenna 1 and the second antenna 2 is reduced, and the performances of the first antenna 1 and the second antenna 2 are improved. Different matching circuit can be inserted through the tuning switch 4 of connecting isolation minor matters 3, and the size that changes tuning switch 4 matching circuit can dynamic adjustment keep apart the operating frequency of minor matters 3, the utility model discloses the advantage of dynamic promotion antenna at different frequency performance has in fact.

Preferably, the isolation branch 3 is a T-shaped isolation branch.

Preferably, the first antenna 1 comprises a long branch 11 and a short branch 12.

Preferably, the long branch 11 resonates at a frequency of 2.4GHz, and the short branch 12 resonates at a frequency of 4.4 GHz.

Preferably, the distance between the first antenna 1 and the second antenna 2 is 5 mm; under the state that the isolation branch 3 is added, two frequencies of the first antenna 1 and the second antenna 2, namely 2.4GHz and 4.4GHz, can be in a better state.

In summary, when the first antenna 1 and the second antenna 2 both operate at 4.4GHz without the isolation stub 3, the efficiency of the two antennas S12 is about-9 dB at 4.4GHz, and about-0.7 dB; the isolation branch 3 is added, the tuning switch 4 is adjusted to be connected in series with a 3.5nH inductor ground, at the moment, S12 of the two antennas is lower than-16 dB at 4.4GHz, the optimal position is lower than-40 dB, S12 is improved by about 8dB (as shown in figure 3), and the efficiency is improved by about 0.5dB to-0.2 dB (as shown in figure 4); when the isolation branch 3 is added, the bandwidth of the antenna is obviously better than that of the state without the isolation branch 3 at 4.4 GHz.

However, when the efficiency of the isolation branch 3 at 4.4GHz is improved, the resonance at 2.4GHz is deteriorated, so that the efficiency is also reduced; the tuning switch 4 is selected to be disconnected from the floor 10, so that the isolation stub 3 is in a suspended state, and the antenna efficiency at 2.4GHz is improved to-1.2 dB from-3.5 dB of the isolation stub 3 (as shown in FIG. 4).

Under the state that the resonant frequency of the antenna is given, the isolated frequency can be controlled by adjusting the size of the matching circuit of the tuning switch 4, so that the aim of optimizing the performance of the antenna with the required frequency is fulfilled.

It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.

Claims

1. An antenna of adjustable isolation which characterized in that: the antenna comprises a first antenna (1), a second antenna (2), an isolation branch (3) and a tuning switch (4), wherein the first antenna (1) is arranged on one side of the isolation branch (3), the second antenna (2) is arranged on the other side of the isolation branch (3), and the first antenna (1) and the second antenna (2) have the same structure; the isolation branch (3) is grounded through the tuning switch (4).

2. An adjustable isolation antenna as claimed in claim 1, wherein: the isolation branch sections (3) are T-shaped isolation branch sections.

3. An adjustable isolation antenna as claimed in claim 1 or 2, wherein: the distance between the first antenna (1) and the second antenna (2) is 5 mm.

4. An adjustable isolation antenna as claimed in claim 1 or 2, wherein: the first antenna (1) comprises a long stub (11) and a short stub (12).

5. An adjustable isolation antenna as claimed in claim 4, wherein: the long branch (11) resonates at 2.4GHz frequency, and the short branch (12) resonates at 4.4GHz frequency.