WO2018028268A1

WO2018028268A1 - Low-frequency radiation unit, antenna and multi-frequency shared antenna

Info

Publication number: WO2018028268A1
Application number: PCT/CN2017/085503
Authority: WO
Inventors: 姜维维; 黄立文
Original assignee: 京信通信技术(广州)有限公司; 京信通信系统（中国）有限公司; 天津京信通信系统有限公司
Priority date: 2016-08-10
Filing date: 2017-05-23
Publication date: 2018-02-15
Also published as: CN106450691A; CN106450691B

Abstract

Provided in the present invention is a low-frequency radiation unit, comprising two pairs of dipoles and four pairs of feeding baluns connected with the four dipoles; each dipole comprising a pair of radiation arms, and each radiation arm comprising a first end and a second end which are connected with each other; each pair of the feeding baluns comprising two symmetric and non-parallel support poles, and the support pole comprising a vertical section connected with the first end, a line section extended upwardly and obliquely along the direction of the radiation arm, and a transition section connected between the vertical section and the line section. By arranging the feeding baluns directly below the vertical direction of the dipoles, no internal space of the low-frequency radiation unit is occupied, which is better suited to implement a multi-frequency shared antenna; in addition, the feeding balun is divided into a vertical section, a transition section and a line section, which lowers the vertical height of the balun, thus lowering the cross-sectional height of the low-frequency radiation unit, and saving the antenna cost and the space occupied by the antenna; the present invention is advantageous for the miniaturization of antenna. In addition, the present invention further relates to an antenna which adopts the low-frequency radiation unit, and a multi-frequency shared antenna.

Description

Low frequency radiating element, antenna and multi-frequency shared antenna

Technical field

The present invention relates to the field of antennas, and in particular, to a low frequency radiating unit, an antenna, and a multi-frequency shared antenna.

Background technique

With the development of the communication industry, in the current environment where 2G, 3G and 4G networks coexist, the demand for multi-frequency antennas is increasing, and the requirements for performance indicators are getting higher and higher. Compatible with 2G, 3G and 4G becomes The trend and inevitable trend of multi-frequency antenna technology development. In addition, in order to optimize resource allocation, save site and antenna resources, low-profile, miniaturized multi-frequency antenna can better meet market demand.

In the prior art, in order to save the site, the 2G low-frequency base station antenna is mostly nested with the 3G or 4G high-frequency base station antenna. In order to achieve the better overall radiation performance of the base station antenna of the two frequency bands, the scheme of the patent number CN201134512Y is adopted, such as Figure 1, including two pairs of polarization

orthogonal dipoles

1, 2, 3, 4, four dipoles are rounded, each dipole is connected to a

balun

5a, 5b, 5c, 5d. Taking dipole 1 as an example, the dipole consists of two

unit arms

11a, 11b. The balun consists of two balanced support columns. One end of the two unit arms is connected to the upper ends of the two balanced support columns, respectively. The lower end of the balance support column is disposed on the base, and the two balance support columns are at an angle of 30 to 60 degrees with the horizontal plane of the base. The two balance support columns are parallel to each other, and the lower ends of the four baluns are connected to the annular base. In the above solution, the internal space of the radiating element is occupied by four baluns, which wastes space, and the single high-frequency radiating antenna unit can only be nested in the intermediate base in the low-frequency radiating antenna unit, thereby limiting the flexibility of the multi-frequency shared antenna. .

In addition, as shown in FIG. 2, in the scheme of the patent CN103311675A, the feeding balun is vertically connected to the reflecting plate. Although the internal space of the antenna radiating element is not occupied by the balun in this scheme, the balun has a length of 0.2 to 0.3 operating wavelengths due to the design of the balun vertical reflecting plate, and accordingly, the height of the antenna is also about 0.2 to With 0.3 working wavelengths, the antenna requires a high radome, and the antenna occupies a large space, which is disadvantageous for miniaturization of the antenna and high antenna cost.

Therefore, it is an urgent problem to be solved in the prior art to provide a low-frequency radiating element that enables a low-frequency base station antenna to achieve both a low profile and an internal space of the antenna, thereby more flexibly nesting the high-frequency antenna.

Summary of the invention

A first object of the present invention is to provide a low frequency radiation unit that reduces the height of the radiation unit and that does not occupy its internal space;

A second object of the present invention is to provide an antenna array using the low frequency radiating element;

A third object of the present invention is to provide a multi-frequency shared antenna employing the low frequency radiating element.

In order to achieve the above object, the present invention provides the following technical solutions:

A low frequency radiating element mountable on a metal reflector, comprising two pairs of polarized orthogonal dipoles and four pairs of feeding baluns connected in one-to-one correspondence with four dipoles, each dipole comprising a pair of symmetric and spaced apart radiating arms, each radiating arm comprising a first end parallel to the metal reflector and a second end coupled to the first end, each pair of said feed bales comprising two symmetrical and non-parallel Supporting post comprising a vertical section perpendicularly connected to the first end of the radiating arm, a folding line section for mounting the feeding balun to the metal reflecting plate and extending obliquely upward in the direction of the radiating arm, and connecting to the vertical section , the transition between the line segments.

Preferably, the projection of the four dipoles on the metal reflector is a centrally symmetrical polygon or circle, and the projection of the support pillars in the balun on the metal plate coincides with the corresponding radiating arms of the dipole.

Preferably, the two support columns of each pair of feed baluns are "eight" shaped symmetric.

The angle between the fold line segment and the metal reflector is 30 to 60 degrees.

Preferably, each of said feed baluns has a length of 0.2 to 0.3 wavelengths.

Preferably, each of the feed baluns has a vertical height of 0.1 to 0.2 operating wavelengths.

Preferably, the distance between the two dipoles in the same polarization direction is 0.4 to 0.6 operating wavelengths.

Preferably, the second end of the radiating arm is bent vertically toward the metal reflector.

An antenna includes a metal reflector and at least two of the above-mentioned low frequency radiating units, and the low frequency radiating unit is disposed on the metal reflector.

A multi-frequency shared antenna includes a metal reflector, a plurality of high-frequency radiation units each disposed on a metal reflector, and at least two low-frequency radiation units, wherein at least one high-frequency radiation is embedded in the low-frequency radiation unit unit.

Four of the high frequency radiating elements are embedded in each of the low frequency radiating elements.

A plurality of the high frequency radiating elements are arranged in a plurality of arrays on the metal reflecting plate.

Compared with the prior art, the solution of the invention has the following advantages:

In the low-frequency radiation unit provided by the invention, the feeding balun is disposed directly below the vertical direction of the dipole, does not occupy the internal space of the low-frequency radiation unit, and can be more flexible to nest a plurality of high-frequency radiation units in the low-frequency radiation unit. In order to better realize the multi-frequency shared antenna; in addition, the balun is divided into a vertical section, a curved section and a polygonal section, which reduces the vertical height of the balun, thereby reducing the profile height of the low-frequency radiation unit, saving the antenna cost and the space occupied by the antenna. A miniaturized base station antenna with low profile is realized. In summary, the low frequency radiation unit provided by the invention has a small volume and a simple structure, and is suitable for mass production.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic structural view of a low frequency radiation unit of the prior art;

2 is a schematic structural view of another low frequency radiation unit in the prior art;

Figure 3 is a perspective view of the low frequency radiation unit of the present invention mounted on a metal reflector;

Figure 4 is a perspective view of another angle of the low frequency radiation unit shown in Figure 3;

Figure 5 is a plan view of the low frequency radiation unit shown in Figure 3;

Figure 6 is a perspective view of an antenna employing the low frequency radiating element shown in Figure 3 in the present invention;

Figure 7 is a perspective view of a multi-frequency shared antenna employing the low frequency radiating element shown in Figure 3 in the present invention.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings The same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

The invention provides a low frequency radiation unit and an antenna and a multi-frequency shared antenna using the low frequency radiation unit, as shown in FIG. 3 to FIG. 7, the present invention will be described in detail below with reference to the accompanying drawings.

3 to 5 collectively illustrate a low frequency radiating element 20 of the present invention that can be mounted on a metal reflector 10 for transmitting and receiving communication signals. The low frequency radiating element 20 includes two pairs of polarization

orthogonal dipoles

1, 2, 3, 4, and four pairs of

feeding baluns

12, 22, 32, 42 located directly below the dipole vertical direction. The feed balun is used to connect to an external feed network to feed a dipole.

As shown in FIG. 3, the

dipoles

1, 2, 3, and 4 are the same size, and the dipole 1 and the dipole 3 are orthogonal to the dipole 2 and the dipole 4, forming +/- 45. Degrees of two orthogonal polarizations. In other words, the dipole 1 and dipole 3 are used to transmit and receive signals in one polarization direction, and the dipoles 2 and dipoles 4 are used to transmit and receive signals in the other polarization direction.

Specifically, the dipole 1 is taken as an example, which has a pair of symmetrical and mutually separated radiating

arms

11a, 11b. And each of the radiating arms has a first end parallel to the metal reflector 10 and a second end connected to the first end, and the second end is vertically bent toward the metal reflector.

Similarly, the dipole 2 has radiating

arms

21a, 21b, the dipole 3 has radiating

arms

31a, 31b, and the dipole 4 has radiating

arms

41a, 41b and correspondingly has its first end and second end.

The four pairs of

feed baluns

12, 22, 32, 42 are connected in one-to-one correspondence with the four dipoles. Taking the feed balun 12 as an example, it is disposed directly under the dipole 1 and coincides or substantially coincides with the projection of the dipole on the metal reflector. Similarly, the

feed baluns

22, 32, and 42 are respectively disposed directly below the

dipoles

2, 3, and 4, and the projection on the metal reflector coincides or substantially coincides with the projection of the dipole.

Since the feeding balun is disposed directly under the dipole and does not occupy the space inside the low-frequency radiating unit, the low-frequency radiating unit can be embedded not limited to one high-frequency radiating unit, which is beneficial to the multi-frequency common body design of the antenna.

Referring to Figure 4, each of the feed bales includes a support post for mounting the dipole to a metal reflector. Take a pair of feed baluns 12 as an example, which consists of a pair of symmetrical and

non-parallel Support columns

12a, 12b. The support post 12a includes a vertical section 12a1 vertically connected to the first end of the dipole 1 radiating arm 11, a fold line section 12a3 for mounting the feed balun to the metal reflector 10, and a vertical section 12a1 And a transition portion 12a2 between the broken line segments 12a3, and the broken line segments 12a3 extend obliquely upward from the metal reflecting plate 10 in the direction of the dipole radiating arms 11a.

Correspondingly, the balun 22 comprises 22a and 22b, 22a comprises 22a1, 22a2 and 22a3, 22b comprises 22b1, 22b2 and 22b3; balun 32 comprises 32a and 32b, 32a comprises 32a1, 32a2 and 32a3, 32b comprises 32b1, 32b2 and 32b3 The balun 42 includes 42a and 42b, 42a includes 42a1, 42a2, and 42a3, 42b includes 42b1, 42b2, and 42b3; the

baluns

12, 22, 32, and 42 have the same structure, and thus the above structural features are not described herein.

Since the support column of the feeding balun is arranged in an upwardly inclined polygonal section, a transition section and a vertical section, the height of the feeding balun can be lowered under the premise of satisfying the feeding and supporting requirements, thereby reducing the entire low frequency. The height of the radiating element enables a low profile design of the low frequency radiating element. Compared with the existing low-frequency radiation unit, the feeding balun height is 0.2-0.3 working wavelength, and the height of the feeding balun of the invention is only 0.1-0.2 working wavelength, which greatly reduces the height thereof, so that the present invention The overall height of the low-frequency radiating element is also only 0.1 to 0.2 operating wavelengths, which is conducive to the miniaturization of the antenna.

Referring to FIG. 5, the projections of the

dipoles

1, 2, 3, 4 on the metal reflector 10 form a centrally symmetric quadrilateral, wherein the radiating arm 11a and the radiating arm 11b form a right angle, and similarly, the radiating arm 21a And the radiation arm 21b, the radiation arm 31a and the radiation arm 31b, the radiation arm 41a and the radiation arm 41b constitute another three right angles; and the radiation arm 11a and the radiation arm 41a constitute one side of the quadrilateral, and the radiation arm is similarly 11b and the radiation arm 21a, the radiation arm 21b and the radiation arm 31a, the radiation arm 31b and the eight-unit arm 41b constitute the other three sides.

The dipole 1 is arranged in parallel with the dipole 3, that is, the radiating arm 11b is parallel to the radiating arm 31b, and the radiating arm 11a is parallel to the radiating arm 31a. Similarly, the dipole 2 and the dipole 4 are arranged in parallel, that is, the radiating arm 21a is parallel to the radiation arm 41a, and the radiation arm 21b is parallel to the radiation arm 41b. The distance between the

dipoles

1 and 3 is about 0.4 to 0.6 operating wavelengths, and the distance between the

dipoles

2 and 4 is about 0.4 to 0.6 operating wavelengths.

In other embodiments, the four

dipoles

1, 2, 3, 4 are cast on the metal reflector 10 The shadow forms a circular pattern or other polygonal pattern.

Preferably, the two fold lines of the two support columns of each pair of feed baluns are "eight" shaped symmetric. Each feed balun has a length of 0.2 to 0.3 operating wavelengths.

In summary, in the low frequency radiating unit provided by the present invention, the feeding balun is disposed directly below the dipole unit arm, and does not occupy the internal space of the low frequency radiating unit; and the supporting column in the feeding balun is divided into The vertical section, the transition section and the fold line section effectively reduce the vertical height of the feeding balun, thereby reducing the height of the low frequency radiating element. Therefore, the low frequency radiating element of the invention has the advantages of miniaturization, simple structure and suitable for mass production. .

As shown in FIG. 6, the present invention also discloses an antenna (not labeled) using the above-mentioned low frequency radiating unit 20, comprising at least two low frequency radiating elements 20 and a metal reflecting plate 10, which are linearly arranged in the metal. On the reflector 10 .

As shown in FIG. 7, the present invention also relates to a multi-frequency shared antenna (not labeled) using a low-frequency radiating unit 20, including a metal reflector 10, at least two low-frequency radiating elements 20, and a plurality of high-frequency radiating units 30, The low frequency radiation unit 20 and the high frequency radiation unit 30 are both disposed on a metal reflector.

Preferably, the plurality of high frequency radiation units 30 are arranged in a plurality of arrays.

Further, at least one high frequency radiation unit 30 is embedded in the low frequency radiation unit 20. In the present embodiment, four of the high frequency radiating elements 30 are embedded in each of the low frequency radiating elements.

Since the above-described low frequency radiating unit 20 is employed, the multi-frequency shared antenna of the present invention has the characteristics of small size and low cost.

The above is only a part of the embodiments of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

A low frequency radiating element mountable on a metal reflector, comprising two pairs of polarized orthogonal dipoles and four pairs of feeding baluns connected in one-to-one correspondence with four dipoles, each dipole comprising a pair of symmetric and mutually separated radiating arms, characterized in that each radiating arm comprises a first end parallel to the metal reflector and a second end connected to the first end, each pair of said feed baluns comprising two a symmetrical and non-parallel support column, the support post including a vertical section perpendicularly connected to the first end, a fold line segment for mounting the feed balun to the metal reflector and extending obliquely upward in the direction of the radiating arm and A transition between a vertical segment and a polygonal segment.
The low frequency radiating element according to claim 1, wherein the projection of the four dipoles on the metal reflecting plate is a centrally symmetrical polygon or a circle, and the supporting column in the balun is on the metal reflecting plate. The upper projection coincides with the corresponding radiating arm of the dipole.
The low frequency radiating element according to claim 1, wherein the two supporting columns of each pair of feeding baluns are "eight" shaped symmetric.
The low frequency radiation unit according to claim 1, wherein the angle between the fold line segment and the metal reflector is 30 to 60 degrees.
The low frequency radiating element of claim 1 wherein each of said feed baluns has a length of 0.2 to 0.3 operating wavelengths.
The low frequency radiating element of claim 1 wherein each of said feed baluns has a vertical height of between 0.1 and 0.2 operating wavelengths.
The low frequency radiating element according to claim 1, wherein the distance between the two dipoles in the same polarization direction is 0.4 to 0.6 operating wavelengths.
The low frequency radiating element of claim 1 wherein the second end of the radiating arm is vertically bent toward the metal reflector.
An antenna comprising a metal reflector and at least two low frequency radiating elements according to claims 1 to 8, the low frequency radiating element being disposed on the metal reflector.
A multi-frequency shared antenna, comprising: a metal reflector, a plurality of high-frequency radiation units each disposed on a metal reflector, and at least two low-frequency radiation units according to any one of claims 1-8 At least one high frequency radiation unit is embedded in the low frequency radiation unit.
The multi-frequency shared antenna according to claim 10, wherein four of said high-frequency radiating elements are embedded in each of said low-frequency radiating elements.
The multi-frequency shared antenna according to claim 10, wherein a plurality of said high-frequency radiating elements are arranged in a plurality of arrays on a metal reflecting plate.