An ultra-wideband radiation unit

Abstract

The present invention discloses an ultra-wideband radiation unit, wherein the base station antenna unit comprises a radiation unit, a support member for supporting the radiation unit, and a feed plate, wherein the radiation unit comprises four dipole arms, wherein every two dipole arms are symmetrically arranged on the support member, the feed plate passes through the support member and is coupled to the dipole arms for feeding, and each side of each dipole arm has a bent portion formed by bending downward. The present invention further realizes the miniaturization and lightness of the base station antenna while widening the working frequency band of the dipole.

Description

Technical Field

[0001] The invention relates to the field of mobile communications and is applied to an antenna network system, in particular to an ultra-wideband radiation unit used as a base station antenna. Background Art

[0002] Ultra-wideband antenna communication technology (UWB) generally refers to radio technology with a signal bandwidth greater than 1.5GHz or a bandwidth ratio (ratio of signal width to center frequency) greater than 25%. Ultra-wideband antennas are key components in ultra-wideband wireless communication systems, and the performance of the antenna will directly affect the performance of the entire system.

[0003] With the rapid development of mobile communication technology, multi-band ultra-wideband base station antennas have become the trend of future antenna development. The number of radiating units in the antenna will also increase exponentially. Therefore, equipment manufacturers and operators have increasingly stringent requirements on the size and weight of antennas. Therefore, the miniaturization and lightweight of components such as radiating units in antennas have become increasingly important.

[0004] The existing Chinese patent document with application number CN201610928844.1 discloses an ultra-wideband radiation unit and antenna, wherein the radiation unit includes a pair of orthogonally arranged dipoles, a balancer for balanced feeding of the dipoles, a feed core and a feed circuit board; each dipole includes a pair of radiation unit arms fixed on the feed balancer, wherein both sides of the ends of the radiation unit arms are bent downward; the entire radiation unit arm, the feed balancer, and the feed core are jointly arranged on a supporting plastic part that is injection molded at one time, and the end of the feed balancer and the end of the feed core are jointly welded to the feed circuit board.

[0005] In the above patent document, on the one hand, the radiation unit widens the impedance bandwidth and radiation pattern bandwidth of the radiation unit because the two sides of the end of the radiation unit arm are bent downward, so that the radiation unit is lightweight without sacrificing the electrical performance of the radiation unit; on the other hand, the entire radiation unit adopts a sheet metal bending structure and is supported and fixed by a one-time molded plastic part, which ensures lightweight while ensuring the structural strength of the entire radiation unit, thereby realizing the miniaturization and lightweight of the radiation unit and the antenna.

[0006] However, the above patent still has the following defects: 1. The bent unit arms are formed on both sides of the end of the radiation unit arm. Although the bandwidth of the unit is widened to a certain extent, there is still room for further improvement; 2. The radiation unit arm and the feeding balancer are designed as an integrated whole, which is not flexible enough; 3. The feeding core, balancer, and plastic support parts supporting the radiation unit arm have complex structures, which makes the entire radiation unit structure complex, and further increases the overall weight of the vibrator. Summary of the invention

[0007] The purpose of the present invention is to overcome the defects of the prior art and provide an ultra-wideband radiation unit that realizes miniaturization and lightness of a base station antenna while broadening the operating frequency band of the oscillator.

[0008] To achieve the above-mentioned purpose, the present invention proposes the following technical solution: an ultra-wideband radiation unit, comprising a radiation unit, a support member for supporting the radiation unit and a feeding plate, the radiation unit comprising four dipole arms, every two dipole arms are symmetrically arranged on the support member, the feeding plate passes through the support member and is coupled to the dipole arm for feeding, and each side of each dipole arm has a bending portion formed by bending downward.

[0009] Preferably, the vibrator arm, the support member and the feeding plate are detachably mounted, and the support member is made of insulating material.

[0010] Preferably, the support member comprises four support parts corresponding to four dipole arms, and the feeding board passes through the support parts and the corresponding dipole arms in sequence to be coupled with the dipole arms for feeding.

[0011] Preferably, a coupling portion extends outwardly from one side of the vibrator arm, and the coupling portion and the corresponding supporting portion are both provided with a limiting slot for the feeding board to pass through.

[0012] Preferably, the coupling portion is formed by extending outward from a lower end of a bent portion on one side of the vibrator arm.

[0013] Preferably, the vibrator arm is also limited on the corresponding support part by a limiting structure.

[0014] Preferably, the limiting structure comprises a limiting hole provided on the vibrator arm and an elastic limiting member provided on the support portion, a limiting step is formed on the elastic limiting member, and the limiting step is clamped on the vibrator arm after the elastic limiting member passes through the limiting hole.

[0015] Preferably, the feed board is two PCB feed boards that cross each other, and after crossing, the upper end of the feed board forms four feeding ends corresponding to the four vibrator arms, and each of the feeding ends forms a feeding protrusion, and the feeding protrusion passes through the limiting slots on the supporting part and the coupling part in sequence.

[0016] Preferably, the support member is also provided with a mounting portion reserved for mounting an isolation sheet.

[0017] Preferably, a protruding mounting column is provided at the center of the bent portion.

[0018] Preferably, the vibrator arm is a sheet metal part, the support part is a plastic support part, and the feeding board is a PCB feeding board.

[0019] Preferably, the vibrator arm is at least one of a square, a circle, a diamond, and a fan-shaped vibrator arm.

[0020] Preferably, the four support portions are in or approximately in a butterfly shape as a whole.

[0021] Preferably, the two feeding plates are cross-shaped.

[0022] Preferably, the coupling portion is perpendicular to the bending portion.

[0023] The present invention also discloses another technical solution: a broadband antenna, comprising a metal reflector, on which at least two ultra-wideband radiation units are arranged.

[0024] Preferably, at least one low-frequency oscillator coaxially arranged with the ultra-wideband radiation unit is also provided on the metal reflection plate.

[0025] The beneficial effects of the present invention are:

[0026] 1. Each side of the dipole arm is provided with a downward bending feature, which widens the radiation area of ​​the dipole arm to the maximum extent without increasing the projection area, thereby achieving the characteristic of broadening the working frequency band of the dipole and achieving a relative bandwidth of 75%; based on the 75% bandwidth feature, the working frequency band of the base station antenna unit of the present invention can be flexibly adjusted to cover 1400-2700MHz or 1695-3700MHz.

[0027] 2. The vibrator arm, support and feeding board can be detachably installed, and the assembly is simple, convenient and flexible.

[0028] 3. The matching structure of the thin sheet metal vibrator arm, plastic support, and PCB feed board. The vibrator arm has a simple structure and is easy to replace. The plastic support adopts the form of plastic to provide a firm support capability and also plays the role of limiting the bending blades, which not only strengthens the strength of the unit but also facilitates assembly. The feed board adopts the form of PCB feeding, which is flexible and adjustable. The base station antenna unit formed by the combination of the three has a simple structure, a light overall weight, is easy to produce and manufacture, and greatly reduces the production cost.

[0029] 4. The base station antenna unit of the present invention is relatively small as a whole, which facilitates the miniaturization of the base station antenna, and can work independently and can also be coaxially arranged with other frequency band oscillators. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a base station antenna unit of the present invention;

[0031] Figure 2 , Figure 3 It is a schematic diagram of a partial exploded structure of a base station antenna unit of the present invention;

[0032] Figure 4It is a schematic diagram of the fully exploded structure of the base station antenna unit of the present invention;

[0033] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure of the middle part (limiting member 22);

[0034] Figure 6 yes Figure 4 The middle part (mounting column 28) is an enlarged structural diagram;

[0035] Figure 7 It is a schematic structural diagram of a broadband antenna according to one embodiment of the present invention.

[0036] Reference numerals:

[0037] 1. Vibrator arm, 11. Bending portion, 12. Limiting hole, 13. Coupling portion, 14. Limiting slot, 2. Support member, 21. Support portion, 22. Limiting member, 23. Limiting column, 24. Gap, 25. Limiting portion, 26. Limiting step, 27. Limiting slot, 28. Mounting column, 3. Feeding board, 31. Feeding board body, 32. Feeding end, 33. Feeding protrusion, 4. Metal reflector, 5. Low-frequency vibrator. DETAILED DESCRIPTION

[0038] The technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention.

[0039] Combination Figure 1 to Figure 4 As shown, an ultra-wideband radiation unit disclosed in the present invention includes a radiation unit, a support member 2 and a feeding plate 3. The radiation unit is supported on the support member 2, and the feeding plate 3 passes through the support member 2 to feed and couple with the radiation unit. The radiation unit includes four dipole arms 1, and each side of each dipole arm 1 has a bending portion 11 formed by bending downward. The present invention effectively widens the radiation area of ​​the dipole arm 1 without increasing the projection area by virtue of the downward bending feature of each side of the dipole arm 1, thereby achieving the characteristic of widening the working frequency band of the dipole.

[0040] Specifically, every two dipole arms 1 are symmetrically arranged on the support 2 to form a dipole. The two dipole arms 1 are preferably on the same straight line or approximately on the same straight line, and the four dipole arms 1 form a pair of dipoles, that is, a dual-polarized radiation unit. In this embodiment, each side of each dipole arm 1 is bent downward to form a bent portion 11, and the ends of two adjacent bent portions 11 are not connected. The bent portion 11 is preferably formed by bending vertically downward from the side of the dipole arm 1, which effectively broadens the working frequency band of the dipole.

[0041] Furthermore, in this embodiment, the dipole arm 1 is made of thin sheet metal as a whole, which is light in weight, and the entire dipole arm 1 is light and compact, with a simple structure and easy to replace. The dipole arm 1 can have a variety of shapes, such as a square in this embodiment, and can also be replaced by a circle, a diamond, a fan, etc., so that the shape of the radiation unit formed by the four dipole arms 1 can also be a variety of shapes, such as a square structure as a whole in this embodiment, and can also be an octagonal structure or other regular polygonal structures.

[0042] In addition, combined Figure 2 and Figure 4 As shown, each vibrator arm 1 is also provided with a through limiting hole 12 for cooperating with the corresponding limiting structure on the support member 2 to limit the vibrator arm 1 on the support member 2; and a coupling portion 13 extends from one side edge of each vibrator arm 1 (the innermost side edge of the vibrator arm 1), and a limiting slot 14 is provided on the coupling portion 13 for the feeding board 3 to pass through.

[0043] The support member 2 is located below the radiation unit and is used to support the radiation unit. In this embodiment, the support member 2 is an insulating material, preferably a plastic support member, which includes four integrally formed support portions 21, and the position of each support portion 21 corresponds to the vibrator arm 1, that is, each support portion 21 is located below the corresponding vibrator arm 1. Similar to the vibrator arm 1, the shape of the support portion 21 can also be various, and the shape can be consistent with the vibrator arm 1 or inconsistent. In this embodiment, the support member 2 formed by the combination of four support portions 21 is butterfly-shaped or approximately butterfly-shaped as a whole, and of course it can also be other shapes. This application does not limit this, as long as it can play the role of supporting the radiation unit.

[0044] Preferably, the vibrator arm 1 is also limited on the corresponding support portion 21 by a limiting structure, so that the vibrator arm 1 and the support portion 21 are firmly installed. In this embodiment, the limiting structure specifically includes the above-mentioned limiting hole 12 arranged on the vibrator arm coupling portion 13 and the elastic limiting member 22 arranged on the support portion 21. In this embodiment, combined with Figure 5As shown, the elastic limiting member 22 is integrally formed with the support portion 21, and includes two limiting columns 23 arranged opposite to each other, with an adjustable gap 24 between the two limiting columns 23, and the lower end of each limiting column 23 is fixed on the support portion 21, and the upper end extends outward to form a limiting portion 25, and a limiting step 26 is formed between the limiting portion 25 and the limiting column 23. In this way, due to the existence of the adjustable gap 24, the size of the adjustable gap 24 is reduced by external force (such as pinching the two limiting columns 23 inward), so that the elastic limiting member 22 can be passed through the limiting hole 12. After the limiting hole 12 passes through, the external force on the limiting member 22 is removed, and the adjustable gap 24 is restored, so that the elastic limiting member 22 passes through the limiting hole 12 and the limiting step 26 is clamped on the vibrator arm 1. Of course, the limiting structure here can also be replaced with other conventional replacement structures, as long as the vibrator arm 1 is limited to the support portion 21. The support member 2 of the present application is made of plastic, which not only provides a firm support capability but also serves to limit the bending of the vibrator arm 1, thereby not only enhancing the strength of the unit but also facilitating assembly.

[0045] In addition, each support portion 21 is also provided with a corresponding limit slot 27 corresponding to the limit slot 14 on the dipole arm coupling portion 13. After the dipole arm 1 is mounted on the support portion 21, the limit slots 27 on both overlap, allowing the feed board 3 to pass through. In this embodiment, the limit slot 27 is long and strip-shaped.

[0046] Furthermore, combined with Figure 4 and Figure 6 As shown, the support member 2 is also provided with at least one protruding mounting post 28, on which a spacer may be mounted or not mounted according to the antenna performance requirements. In this embodiment, the mounting post 28 is arranged at the center of the support member 2, and four mounting posts 28 are evenly distributed along the center of the support member 2, and the spacer is mounted on the support member 2 through these mounting posts 28.

[0047] The feeding board 3 is located below the support member 2, and its upper end passes through the support member 2 to be fed and coupled with the vibrator arm 1. Specifically, in this embodiment, the feeding board 3 includes two intersecting feeding board bodies 31, preferably in a cross shape, and after the intersection, four feeding ends 32 corresponding to the four vibrator arms 1 are formed at the upper end of the feeding board 3, and each of the feeding ends 32 protrudes upward to form a feeding protrusion 33, and the feeding protrusion 33 passes through the corresponding support portion 21 and the limiting slots 27, 14 on the coupling portion 13, so that the feeding board 3 is fed and coupled with the vibrator arm 1.

[0048] In this embodiment, the feed board 3 is preferably a PCB feed board, which is flexible and adjustable, light in weight, easy to produce and manufacture, and low in cost.

[0049] During assembly, the four vibrator arms 1 are respectively mounted on the four supporting parts 21, and fastened by the elastic limiter 22 on the supporting part 21. The two PCB feeding board bodies 31 are assembled with the supporting part 2 through the limiter slots 27 and 14 to achieve feeding coupling with the vibrator arms 1, and the whole assembly process is simple and convenient.

[0050] The present invention broadens the characteristics of the vibrator working frequency band to achieve a relative bandwidth of 75%; based on the 75% bandwidth feature, the working frequency band of the base station antenna unit of the present invention can be flexibly adjusted to cover 1400-2700MHz or 1695-3700MHz.

[0051] An array antenna designed using the above-mentioned ultra-wideband radiation unit is disclosed in an embodiment of the present invention, such as Figure 7 As shown, the antenna includes a metal reflector 4, on which at least two of the above-mentioned ultra-wideband radiation units and at least one low-frequency vibrator 5 are arranged, and the low-frequency vibrator 5 is coaxial with the ultra-wideband radiation unit ( Figure 6 In this embodiment, five vibrators of the present invention and two low-frequency vibrators 5 are arranged on the metal reflector 4. As described above, due to the ultra-wideband characteristics of the base station antenna unit of the present invention, the array antenna of the present invention can achieve the frequency division effect of 1695-2400MHz and 3550-3700MHz in a limited space.

[0052] Alternatively, only at least two of the above-mentioned ultra-wideband radiation units may be disposed on the metal reflection plate 4 .

[0053] The technical contents and technical features of the present invention have been disclosed as above. However, those skilled in the art may still make various substitutions and modifications based on the teachings and disclosures of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications that do not depart from the present invention and are covered by the claims of this patent application.

Claims

1. An ultra-wideband radiation unit, comprising a radiation unit, a support for supporting the radiation unit and a feeding board, wherein the radiation unit comprises four dipole arms, and every two dipole arms are symmetrically arranged on the support, characterized in that: The support member includes four supporting parts corresponding to four dipole arms, a coupling part extends outward from one side of the dipole arm, the feeding board is two PCB feeding boards that cross each other, and after crossing, four feeding ends corresponding to the four dipole arms are formed at the upper end of the feeding board, and the feeding ends on the feeding board pass through the support member to couple with the dipole arms for feeding, and each side of each dipole arm has a bending part formed by bending downward.

2. The ultra-wideband radiation unit according to claim 1, characterized in that: The vibrator arm, the support member and the feeding plate are detachably mounted, and the support member is made of insulating material.

3. The ultra-wideband radiation unit according to claim 1 or 2, characterized in that: The feeding plate passes through the supporting part and the corresponding dipole arm in sequence, and is coupled with the dipole arm for feeding.

4. The ultra-wideband radiation unit according to claim 3, characterized in that: The coupling portion and the corresponding supporting portion are both provided with a limiting slot for the feeding board to pass through.

5. The ultra-wideband radiation unit according to claim 4, characterized in that: The coupling portion is formed by extending outward from the lower end of the bent portion on one side of the vibrator arm.

6. The ultra-wideband radiation unit according to claim 3, characterized in that: The vibrator arm is also limited on the corresponding support part by a limiting structure.

7. The ultra-wideband radiation unit according to claim 6, characterized in that: The limiting structure comprises a limiting hole arranged on the vibrator arm and an elastic limiting member arranged on the supporting portion, wherein a limiting step is formed on the elastic limiting member, and the limiting step is clamped on the vibrator arm after the elastic limiting member passes through the limiting hole.

8. The ultra-wideband radiation unit according to claim 4, characterized in that: Each of the feeding ends forms a feeding protrusion, and the feeding protrusion passes through the limiting slots on the supporting portion and the coupling portion in sequence.

9. The ultra-wideband radiation unit according to claim 1, characterized in that: A protruding mounting column is provided at the center of the support member.

10. The ultra-wideband radiation unit according to claim 1, characterized in that: The bending portion is formed by bending vertically downward from the side of the vibrator arm.

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