A 5G low-profile dual-polarization radiating unit and base station antenna

Abstract

The present invention relates to a 5G low-profile dual-polarization radiation unit and a base station antenna, the 5G low-profile dual-polarization radiation unit comprises a radiator and a balun arranged at the bottom of the radiator, the radiator comprises two polarization orthogonally arranged vibrators, each vibrator comprises two radiating arms symmetrical about the center of the radiator, the four radiating arms of the two vibrators are located on the same plane and the four radiating arms are interconnected, each radiating arm has a hollow hole, the hollow holes of the two radiating arms of each vibrator are symmetrical about the center of the radiator, the balun comprises four supporting members, each supporting member corresponds to a radiating arm, and the top end of each supporting member is connected to the inner wall of one end of the hollow hole of the corresponding radiating arm close to the center of the radiator. The present invention has a simple structure, is easy to manufacture, reduces volume and weight, and reduces costs.

Description

[Technical field]

[0001] The present invention relates to the field of mobile communications, and in particular to a 5G low-profile dual-polarization radiation unit and a base station antenna. [Background technology]

[0002] In mobile communication systems, base station antennas are an important part of the entire system. Base station antenna technology and applications continue to evolve with the development of the system, placing higher requirements on base station antenna performance.

[0003] With the advent of the 5G era, traditional mobile communication antennas are subject to great restrictions in construction, property site selection, environmental protection and other aspects due to their large size and weight. Therefore, the miniaturization and low profile of antennas are not only an inevitable trend in network development, but also one of the most effective ways to solve the current problems related to base station construction and installation.

[0004] Traditional base station antennas generally use metal die-cast oscillators as their radiation units. Metal die-cast oscillators have a complex structure and are not easy to manufacture. They are also large in size, heavy in weight, and expensive, and cannot meet the requirements of simplified, miniaturized, lightweight, and low-cost base station antenna structures. [Summary of the invention]

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned technology and provide a 5G low-profile dual-polarization radiation unit and base station antenna with simple structure, easy manufacturing, small size, light weight and low cost.

[0006] A first aspect of the present invention provides a 5G low-profile dual-polarization radiation unit, comprising a radiator and a balun arranged at the bottom end of the radiator, the radiator comprising two vibrators with orthogonal polarizations, each vibrator comprising two radiating arms symmetrical about the center of the radiator, the four radiating arms of the two vibrators being located on the same plane and being interconnected, each radiating arm having a hollow hole, the hollow holes of the two radiating arms of each vibrator being symmetrical about the center of the radiator, the balun comprising four supporting members, each supporting member corresponding to a radiating arm, the top end of each supporting member being connected to the inner wall of one end of the hollow hole of the corresponding radiating arm close to the center of the radiator.

[0007] Furthermore, a notch is provided between two adjacent radiation arms, and the cross-sectional shape of the notch is a cross, a square, a rectangle, a triangle, a trumpet or a plum blossom.

[0008] Furthermore, the outer side of each radiating arm is bent downward to form a bending portion, and the angle between the bending portion and the bottom end surface of the radiator is greater than or equal to 20 degrees and less than or equal to 85 degrees; the bending portion has a through hole, which extends to the corresponding radiating arm and is connected to the end of the hollow hole of the corresponding radiating arm away from the center of the radiator.

[0009] Furthermore, the height of the support member is greater than or equal to 0.0625 center frequency wavelengths and less than or equal to 0.125 center frequency wavelengths.

[0010] Furthermore, the cross-sectional shape of the radiator is square, rectangular, circular or elliptical.

[0011] Furthermore, the radiator and the balun are integrally formed.

[0012] The second aspect of the present invention provides a base station antenna, comprising a reflector, a feeder arranged on the front of the reflector, and a radiating array arranged on the front of the feeder, wherein the radiating array comprises a plurality of 5G low-profile dual-polarization radiating units arranged at intervals along the longitudinal direction of the feeder, the 5G low-profile dual-polarization radiating unit comprises a radiator and a balun arranged at the bottom end of the radiator, the radiator comprises two vibrators arranged orthogonally in polarization, each vibrator comprises two radiating arms symmetrical about the center of the radiator, the four radiating arms of the two vibrators are located on the same plane and the four radiating arms are interconnected, each radiating arm has a hollow hole, and the hollow holes of the two radiating arms of each vibrator are symmetrical about the center of the radiator, the balun comprises four supporting members, each supporting member corresponds to a radiating arm, the top end of each supporting member is connected to the inner wall of one end of the hollow hole of the corresponding radiating arm close to the center of the radiator, and the bottom end of each supporting member is arranged on the front of the feeder and connected to the feeding circuit of the feeder.

[0013] Furthermore, a plug-in portion is formed at the bottom end of each support member, and a plug-in hole corresponding to the plug-in portion is provided on the front side of the feeder, and the plug-in portion is plugged into and welded to the corresponding plug-in hole.

[0014] Furthermore, two sides of the reflective plate are respectively bent upward to form two folded edges.

[0015] Furthermore, the height of the support member is greater than or equal to 0.0625 center frequency wavelengths and less than or equal to 0.125 center frequency wavelengths.

[0016] The 5G low-profile dual-polarization radiation unit of the present invention simplifies the structure, is easy to manufacture, reduces the volume and weight, and reduces the cost.

Brief Description of the Drawings

[0017] Figure 1 A schematic diagram of the structure of a base station antenna provided by one embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A top view schematic diagram of a 5G low-profile dual-polarization radiating unit of a base station antenna is shown;

[0019] Figure 3 yes Figure 1 A schematic diagram of the structure of the bottom end of a 5G low-profile dual-polarized radiation unit of a base station antenna shown;

[0020] Figure 4 yes Figure 1 A schematic top view of a 5G low-profile dual-polarization radiating unit of an alternative solution for a base station antenna is shown;

[0021] Figure 5 yes Figure 1 A schematic diagram of the structure of the top of a 5G low-profile dual-polarization radiating unit of an alternative base station antenna is shown. [Specific implementation method]

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] refer to Figure 1 A base station antenna provided by the present invention comprises a reflector 10, a feeder 20 arranged on the front of the reflector 10, and a radiation array arranged on the front of the feeder 20. The radiation array comprises a plurality of 5G low-profile dual-polarization radiation units 30 arranged at intervals along the longitudinal direction of the feeder 20. The reflector 10 is a metal reflector, the feeder 20 is a dielectric substrate with a certain thickness and a dielectric constant, and a feeding circuit (not shown in the figure) is provided on the front of the feeder 20. The feeding circuit is used to provide feeding to the plurality of 5G low-profile dual-polarization radiation units 30. Preferably, the feeding circuit adopts a power division network joint feeding method to realize feeding of the plurality of 5G low-profile dual-polarization radiation units 30. In this embodiment, the number of 5G low-profile dual-polarization radiation units 30 is three. It can be understood that the number of 5G low-profile dual-polarization radiation units 30 can also be, for example, one, two, four, etc. The number of 5G low-profile dual-polarization radiation units 30 can be set according to actual conditions.

[0024] The two sides of the reflector 10 are respectively bent upward to form two folded edges 11, and the folded edges 11 are arranged perpendicular to the reflector 10. The arrangement of the folded edges 11 can be used to improve the radiation characteristics of the radiation array.

[0025] refer to Figures 1 to 3 The 5G low-profile dual-polarization radiation unit 30 includes a radiator and a balun disposed at the bottom of the radiator. The radiator is used to transmit or receive communication signals. The balun supports and feeds the radiator.

[0026] The radiator includes two oscillators with orthogonal polarizations, and the two polarizations are positive 45-degree polarization and negative 45-degree polarization, respectively. Each oscillator includes two radiating arms 31 that are symmetrical about the center of the radiator. The four radiating arms 31 of the two oscillators are located on the same plane and the four radiating arms 31 are connected to each other. The four radiating arms 31 are arranged in an X shape. Each radiating arm 31 has a hollow hole 311, and the hollow hole 311 is convenient for forming a support member 41 by stamping. The hollow holes 311 of the two radiating arms 31 of each oscillator are symmetrical about the center of the radiator. The balun includes four support members 41, each support member 41 corresponds to a radiating arm 31, and the top end of each support member 41 is connected to the inner wall of one end of the hollow hole 311 of the corresponding radiating arm 31 close to the center of the radiator. The bottom end of each support member 41 is arranged on the front of the feeder 20 and is connected to the feeding circuit of the feeder 20, so as to realize feeding of the corresponding radiating arm 31. Preferably, the bottom end of each support member 41 is connected to the feeding circuit of the feeding member 20 by welding. The support member 41 is arranged vertically to the corresponding radiation arm 31. Through this structure, the 5G low-profile dual-polarization radiation unit 30 of the present invention has the characteristics of simple structure, small size, light weight, easy manufacturing, low cost, etc. compared with the metal die-cast vibrator of the traditional base station antenna, and has good electrical performance and radiation performance such as high cross-polarization resolution and excellent front-to-back ratio performance. Therefore, the base station antenna of the present invention also meets the requirements of simplified structure, miniaturization, lightweight, and low cost, and meets the requirements of good electrical performance and radiation performance, and can be realized in the application of Massive MIMO (large-scale antenna technology) antennas in the future.

[0027] The radiator and the balun of this embodiment are integrally formed, for example, by stamping a sheet metal part, which is easy to manufacture and further reduces the cost. The four support members 41 of the balun are respectively bent relative to the corresponding radiation arms 31 of the radiator.

[0028] Preferably, the bottom end of each support member 41 is formed with an inserting portion 411 (see Figure 3 ), a socket corresponding to the plug-in portion 411 is provided on the front of the feeder 20 (the feeder 20 is a PCB plate with a certain thickness and dielectric constant), and the plug-in portion 411 is plugged into the corresponding socket and welded to the corresponding socket, thereby realizing the welding of the 5G low-profile dual-polarization radiation unit 30 on the front of the feeder 20, which is simple to assemble.

[0029] The four support members 41 adopt differential feeding to feed the corresponding radiation arms 31, that is, the phases of the two support members 41 corresponding to the two radiation arms 31 of each vibrator are 0 degrees and 180 degrees respectively, so that the 5G low-profile dual-polarization radiation unit 30 of the present invention does not need to set a balanced current structure, which can improve the impedance characteristics of the 5G low-profile dual-polarization radiation unit 30, further simplify the structure, and meet the requirements of the base station antenna.

[0030] The height of the support member 41 is greater than or equal to 0.0625 center frequency wavelengths and less than or equal to 0.125 center frequency wavelengths. The height of the support member 41 is mainly determined by the shape and size of the radiation surface of the radiator. Preferably, the height of the support member is 0.125 center frequency wavelengths, which can reduce the height of the 5G low-profile dual-polarization radiation unit 30, thereby reducing the overall height of the base station antenna, further reducing the volume and weight. The center frequency wavelength is calculated as follows: Taking the 3.5G frequency band as an example, assuming that the frequency band range is 3.4GHz-3.6GHz, the center frequency wavelength is (3.4+3.6) / 2.

[0031] A slot 312 is provided between two adjacent radiating arms 31, and the slot 312 has a certain improvement in the isolation between the antenna ports. The outer side of each radiating arm 31 (i.e., the side of the radiating arm 31 away from the center of the radiator) is bent downward to form a bent portion 32, and the angle between the bent portion 32 and the bottom end surface of the radiator is greater than or equal to 20 degrees and less than or equal to 85 degrees, which has a certain effect on the antenna matching. The provided bent portion 32 can improve the electromagnetic characteristics of the corresponding radiating arm 31. The bent portion 32 has a through hole 321, and the through hole 321 has a certain effect on the antenna pattern matching. The through hole 321 extends to the corresponding radiating arm 31 and is connected to the end of the hollow hole 311 of the corresponding radiating arm 31 away from the center of the radiator.

[0032] like Figure 2 and Figure 3 As shown, the bending portion 32 includes a first rectangular portion 32a, a second rectangular portion 32c, and a chamfered right angle portion 32b connected between the first rectangular portion 32a and the second rectangular portion 32c. Figure 4 and 5 As shown, the chamfered right-angled portion 32b can be replaced by a rounded corner portion 32d, and the specific structure of the bending portion 32 can be set according to actual conditions.

[0033] In this embodiment, the cross-sectional shape of the radiator is a square, and the two vibrators are respectively located on two diagonal lines of the radiator. It can be understood that the cross-sectional shape of the radiator can also be, for example, a rectangle, a circle, an ellipse, etc., which can be set according to actual conditions.

[0034] The cross-sectional shape of the hollow hole 311 is a rectangle. It is understandable that the cross-sectional shape of the hollow hole 311 can also be, for example, square or trumpet-shaped, etc., which can be set according to actual conditions. The cross-sectional shape of the through hole 321 is a trumpet-shaped, or can also be, for example, fan-shaped, etc., which can be set according to actual conditions.

[0035] The cross-sectional shape of the notch 312 is square. It can be understood that the cross-sectional shape of the notch 312 can also be a cross, square, rectangle, triangle, trumpet, plum blossom, etc., which can be set according to actual conditions.

[0036] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, such as combining different features in various embodiments, etc., which all belong to the protection scope of the present invention.

Claims

1. A 5G low-profile dual-polarization radiation unit, comprising a radiator and a balun arranged at the bottom of the radiator, characterized in that: The radiator comprises two vibrators with orthogonal polarizations, each vibrator comprises two radiating arms symmetrical about the center of the radiator, the four radiating arms of the two vibrators are located on the same plane and are connected to each other, each radiating arm has a hollow hole, and the hollow holes of the two radiating arms of each vibrator are symmetrical about the center of the radiator, and the balun comprises four supporting members, each supporting member corresponds to a radiating arm, and the top end of each supporting member is connected to the inner wall of one end of the hollow hole of the corresponding radiating arm close to the center of the radiator; A notch is provided between two adjacent radiating arms for improving the isolation between antenna ports; the outer side of each radiating arm is bent downward relative to the bottom end surface of the radiating arm to form a bent portion; the notch is a notch recessed inward from the outer edge of the radiating arm; the notch is located between the bent portions of two adjacent radiating arms and is partially recessed to the bottom end surface of the radiating arm; the bent portion has a through hole, which extends to the corresponding radiating arm and is connected to an end of the hollow hole of the corresponding radiating arm away from the center of the radiator.

2. The 5G low-profile dual-polarization radiating unit according to claim 1, characterized in that: The cross-sectional shape of the notch is a cross, a square, a triangle, a trumpet or a plum blossom; the angle between the bent portion and the bottom end surface of the radiator is greater than or equal to 20 degrees and less than or equal to 85 degrees.

3. The 5G low-profile dual-polarization radiating unit according to claim 1, characterized in that: The height of the support member is greater than or equal to 0.0625 center frequency wavelengths and less than or equal to 0.125 center frequency wavelengths.

4. The 5G low-profile dual-polarization radiating unit according to claim 1, characterized in that: The cross-section of the radiator is square or circular.

5. The 5G low-profile dual-polarization radiating unit according to claim 1, characterized in that: The radiator and the balun are integrally formed.

6. A base station antenna, comprising a reflector, a feeder arranged on the front of the reflector, and a radiating array arranged on the front of the feeder, wherein the radiating array comprises a plurality of 5G low-profile dual-polarization radiating units arranged at intervals along the longitudinal direction of the feeder, wherein the 5G low-profile dual-polarization radiating unit comprises a radiator and a balun arranged at the bottom of the radiator, characterized in that: The radiator comprises two oscillators with orthogonal polarizations, each oscillator comprises two radiating arms symmetrical about the center of the radiator, the four radiating arms of the two oscillators are located on the same plane and are connected to each other, each radiating arm has a hollow hole, and the hollow holes of the two radiating arms of each oscillator are symmetrical about the center of the radiator, and the balun comprises four supporting members, each supporting member corresponds to a radiating arm, the top end of each supporting member is connected to the inner wall of one end of the hollow hole of the corresponding radiating arm close to the center of the radiator, and the bottom end of each supporting member is arranged on the The front side of the feeder is connected to the feed circuit of the feeder; a notch for improving the isolation between antenna ports is provided between two adjacent radiating arms; the outer side of each radiating arm is bent downward relative to the bottom end surface of the radiating arm to form a bent portion; the notch is a notch recessed inward from the outer edge of the radiating arm; the notch is located between the bent portions of two adjacent radiating arms and is partially recessed to the bottom end surface of the radiating arm; the bent portion has a through hole, which extends to the corresponding radiating arm and is connected to an end of the hollow hole of the corresponding radiating arm away from the center of the radiator.

7. The base station antenna according to claim 6, characterized in that: A plug-in portion is formed at the bottom end of each support member, and a plug-in hole corresponding to the plug-in portion is arranged on the front side of the feed member, and the plug-in portion is plugged into and welded to the corresponding plug-in hole.

8. The base station antenna according to claim 6, characterized in that: The two sides of the reflective plate are respectively bent upward to form two folded edges.

9. The base station antenna according to claim 6, characterized in that: The height of the support member is greater than or equal to 0.0625 center frequency wavelengths and less than or equal to 0.125 center frequency wavelengths.

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