WO2018090595A1

WO2018090595A1 - Broadband dual-polarized radiation unit

Info

Publication number: WO2018090595A1
Application number: PCT/CN2017/085871
Authority: WO
Inventors: 李恩社; 樊宏亮; 贺亚飞; 熊兰; 刘小芳
Original assignee: 深圳国人通信股份有限公司
Priority date: 2016-11-17
Filing date: 2017-05-25
Publication date: 2018-05-24
Also published as: CN206301948U

Abstract

A broadband dual-polarized radiation unit comprises a reflector (10) and an oscillator (20) mounted to the reflector (10), wherein the oscillator (20) has a support seat (30) and four radial arms (40) circumferentially arranged at the top of the support seat (30) and forming two pairs of orthogonal radial arms; the support seat (30) comprises a support base (310) and four support branches (320) extending from the support base in a direction away from the reflector (10), each support branch (320) supporting a corresponding radial arm (40); the oscillator (20) are further provided with a first feeding balun (50), a second feeding balun (60), the first feeding balun (50) and the second feeding balun (60) being mounted within the corresponding support branches respectively. The radiation unit solution has the advantages of high gain, high isolation index, good cross polarization and high intermodulation performance.

Description

Broadband dual polarized radiation unit

[0001] The present invention relates to the field of communications, and more particularly to a broadband dual-polarized radiating element.

Background technique

[0002] With the rapid development of 3G and 4G and the fierce competition of network service quality between operators, mobile communication networks have put forward higher requirements for the performance of base station antennas. Especially for broadband multi-frequency antennas suitable for multi-system sharing, wide-band base station antennas are compatible with multiple communication standards, which is of great significance for reducing station construction. The quality of the two-antenna radiation unit is directly related to the overall performance of the mobile communication network.

[0003] The existing base station antenna radiating unit mainly has the following problems: The gain in the frequency band above 2.5 GHz is significantly reduced; the use occasion is limited, and some occasions with high intermodulation requirements cannot be met; the solder joints and screw heads on the front side of the PCB board The escaping hole makes the wiring space insufficient; there is no buckle for fixing the core on the vibrator, and the feed core on the back side P CB is prone to longitudinal displacement; the vibrator end is directly welded to the cable to feed, which causes the feeding network to be too large and bulky. Affects the radiation performance of the antenna and reduces the overall assembly efficiency.

technical problem

Problem solution

Technical solution

[0004] In view of the deficiencies of existing base station antenna radiating elements, the present invention provides a broadband dual-polarized radiating element that is simple in structure and adopts a PCB circuit board feeding scheme.

[0005] The present invention provides a broadband dual-polarization radiating unit comprising a reflector and a vibrator mounted to the reflector, the vibrator having a support base and four radiations circumferentially arranged on top of the support base An arm, the four radiating arms form two pairs of orthogonal radiating arms; the supporting base comprises a supporting base and four supporting branches extending from the supporting base in a direction away from the reflecting plate, each supporting The branch supports a corresponding radiating arm; the vibrator is further equipped with a first feeding balun and a second feeding balun, and the first feeding balun and the second feeding balun are respectively mounted to the corresponding supporting branches Inside.

[0006] As a preferred solution, the vibrator is a half-wave symmetric vibrator, and the arm surface of each of the radiating arms of the vibrator is provided with a fan-shaped hollow structure. [0007] As a preferred solution, a bottom surface of each of the radiating arms is coupled to a vibrator protrusion extending in a direction of the reflecting plate, and the vibrator protrusion is located at an end away from the supporting base.

[0008] As a preferred solution, the first feed balun includes a first pin, a first connection portion, and a second pin that are sequentially connected, and the first pin and the second pin are respectively mounted a balun mounting position of two support branches of the first pair of radiating arms, and the first connecting portion spans the first pair of radiating arms; the second feeding balun includes a third lead of sequential connection a second connecting portion and a fourth pin, wherein the third pin and the fourth pin are respectively mounted in the balun mounting positions of the two supporting branches of the second pair of radiating arms, and the second connecting portion is spanned The second pair of radiating arms are connected.

[0009] As a preferred solution, at least one of the first connecting portion and the second connecting portion has a bent portion to prevent the first feeding balun and the second feeding balun from being short-circuited; The first pin is longer than the second pin, so that the first pin is connected to the feed circuit board after the support branch; the third pin is longer than the fourth pin, so that the third lead The foot is connected to the feeder circuit board after passing through the support branch.

[0010] As a preferred solution, the first feed balun is installed with two first balun media cards, and the two first balun media cards respectively cover the first bow and the first connection a joint of the portion, a junction of the second pin and the first connecting portion; each of the radiating arms is provided with a balun positioning groove communicating with the balun mounting position, when the first feeding balun is connected to the corresponding a first pair of radiating arms, each of the first balun media cards being mounted in a balun positioning groove on the corresponding radiating arm to ensure that the first and second feeding baluns are respectively fixedly connected to the vibrator and mutually insulation.

[0011] As a preferred solution, a second balun media card is further mounted on the first and second pins of the first feed balun, and the second balun media card is mounted to the balun The mounting position is used to define the position of each pin in the balun mounting position to achieve insulation between the first and second pins and the support.

[0012] As a preferred solution, a bottom surface of the support base is provided with a protruding screw hole, and the screw hole is fixed with a screw to mount the vibrator to the reflector, so that the vibrator can continuously from the The excitation power is obtained on the reflector.

[0013] As a preferred solution, an insulating spacer is further disposed between the support base and the reflector; the reflector is provided with a plurality of mounting holes, and the insulating spacer is mounted on a side facing the reflector. And a boss corresponding to the plurality of mounting holes, the boss is embedded in the plurality of mounting holes for insulating the inner wall of the mounting hole; the first pin and the third pin respectively pass through the corresponding Boss and mounting holes to protect The first and second feed baluns are insulated from the reflector.

[0014] As a preferred solution, an insulating spacer is further disposed between the support base and the reflector; the insulating spacer is further mounted with four bosses in a direction toward the support base, and the four protrusions The position of the table corresponds to the balun mounting position on the four support branches, and the four bosses are embedded inside the balun mounting position for positioning.

Advantageous effects of the invention

Beneficial effect

[0015] The radiation unit scheme has the advantages of high gain, high isolation index, good cross polarization, and high intermodulation performance.

Brief description of the drawing

DRAWINGS

1 is a schematic view showing the assembly of a broadband dual-polarization radiating unit according to an embodiment of the present invention;

2 is a schematic structural view of a vibrator of the broadband dual-polarization radiating unit shown in FIG. 1;

3 is a schematic view of another angle of the vibrator shown in FIG. 2; [0018] FIG.

4 is a schematic view showing the assembly of the vibrator shown in FIG. 2;

5 is a cross-sectional view showing the structure of the broadband dual polarized radiation unit shown in FIG. 1.

Embodiments of the invention

[0021] For ease of understanding, the present invention will be further described below in conjunction with the accompanying drawings.

[0022] As shown in FIG. 1, a broadband dual-polarization radiating unit includes a vibrator 20 and a reflector 10 for mounting the vibrator 20. The vibrator 20 is a half-wave symmetrical vibrator having four radiating arms, the four radiating arms forming two pairs of orthogonal radiating arms 40, and the total length of each pair of radiating arms is one-half of the wavelength of the center frequency. The vibrator further includes a support base 30. The radiating arm 40 is circumferentially mounted at the end of the support base 30, and the radiating arms are spaced apart from each other to ensure a distance between the polarizations. The support base 30 includes a support base 310 and four support branches 320 extending from the support base in a direction away from the reflector, and each support branch 320 correspondingly supports a radiation arm 40. A protruding screw hole 33 0 (see FIG. 3 ) is disposed in the center of the bottom of the support base 310 , and the screw hole passes through the insulating spacer 80 and the reflector 10 in sequence, and is disposed on the back of the reflector. The screws 15 are fixedly connected. The vibrator 20 is mounted to the reflecting plate 10 by means of screw fixing, and continuous power supply excitation is obtained from the reflecting plate 10.

As shown in FIG. 2 and FIG. 3, each of the radiating arms 40 on the vibrator 20 has a square frame structure, and the four radiating arms 40 of the vibrator are evenly distributed around the circumference of the supporting base 30. A fan-like hollow is provided on the arm surface of the radiating arm 40, which can appropriately reduce the weight of the vibrator. The radial edges of the radiating arms 40 at the diagonal and fan-shaped hollow portions are smoothed. At the end of each of the radiating arms 40 away from the support base, i.e., at the four diagonal positions of the vibrator, a vibrator projection 42 is also extended. The vibrator projection 42 extends toward the reflecting plate and is substantially parallel to the support post 30. Specifically, the optimum length of the vibrator protrusion 42 is one-sixteenth of the wavelength of the center frequency.

[0024] The above-mentioned vibrator is integrally formed, and the radiating arm 40 and the supporting base 30 are integrally formed, and the radiating arm and the supporting base are made of aluminum alloy or non-magnetic metal material. As a preferred solution, the overall height of the support base 30 is about a quarter of the wavelength of the center frequency. The four support branches of the support are also provided with four balun mounting positions 340 that extend through the support base 310, respectively.

[0025] As shown in FIGS. 4 and 5, the vibrator 20 is also equipped with a first feed balun 50 and a second feed balun 60, the first feed balun 50 and the second feed balun 60 Corresponding to the two pairs of orthogonal radiating arms 40, respectively. In addition, the support base 30 also constitutes a balanced balun of the radiating unit, a transmission line coaxial with the first feeding balun 50, and a coaxial transmission line formed by the second feeding balun 60, which together constitute the embodiment. Balance the feeder.

The first feed balun 50 and the second feed balun 60 are both unitary structures. The first feed balun 50 includes a first pin 51, a first connection portion 52, and a second pin 53 that are sequentially connected together. The first pin 51 and the second pin 53 are substantially parallel to each other and are respectively mounted to the balun mounting positions 3 40 of the two supporting branches of the pair of radiating arms, the length of the first pin 51 being longer than the second pin 53 The length is such that it is fed through the reflector. The second feed balun 60 includes a third pin 61, a second connection portion 62, and a fourth pin 63 which are sequentially connected together. The third pin 61 and the fourth pin 63 are substantially parallel to each other and are respectively mounted to the balun mounting positions 340 of the two supporting branches of the other pair of radiating arms, the length of the third pin 61 being longer than the fourth pin 63 The length is such that it is fed through the reflector.

[0027] The first feed balun 50 is built into a pair of radiating arms 40 on the same diagonal. Each of the radiating arms is provided with a balun positioning groove 410 at a connection with the support base, and the balun positioning groove 410 is in communication with the corresponding balun mounting position 340. Correspondingly, the first feed balun is equipped with two first balun media cards 71, one of which is first The balun media card 71 covers the junction of the first connection portion 52 with the first bow I leg 51, and the other balun media card 71 covers the junction of the first connection portion 52 and the second pin 53. The first pin 51 and the second pin 53 of the first feed balun are respectively mounted to the two support branches of the support seats of the pair of radiation arms 40, and each of the first balun media cards 71 is mounted to the corresponding one. The balun mounting position 340 and the balun positioning groove 410 prevent the first feeding balun from being short-circuited with the radiating arm 40 and the supporting branch 320 of the support base 30, so that the first feeding balun and the supporting branch of the corresponding supporting base are formed. Coaxial cable.

[0028] The structure of the second feed balun 60 is similar to that of the first feed balun 50. Correspondingly, the second feed balun 60 is equipped with two first balun media cards. The second feed balun 60 and the first feed balun 50 are respectively mounted to two pairs of orthogonal radiating arms, and after the installation is completed, the first connecting portion 52 of the first feeding balun 50 and the second feeding bar The second connecting portions 62 of the lunner 60 are orthogonal to each other. To avoid short circuit between the first connecting portion 52 and the second connecting portion 62, at least one of the connecting portions between the first connecting portion 52 and the second connecting portion 62 has Bend section. In the present embodiment, the second connecting portion 62 on the second feed balun 60 is bent to avoid contact with the first connecting portion 52.

[0029] A first balun media card 72 is also mounted on the first feed balun 50 and the second feed balun 60, respectively, and the second balun media card 72 is mounted on the first and second feed cells. The middle of each pin. As the pins on the first feed balun 50 and the second feed balun 60 are mounted into the balun mounting position 340, the second balun media card 72 is snapped onto the inner wall of the balun mounting position 340 to avoid 1. The second feed balun is in direct contact with the inner wall of the balun mounting position 340 to ensure insulation between the first feed balun and the second feed balun and the vibrator.

[0030] Both the first balun media card 71 and the second balun media card 72 are made of an insulating material.

[0031] Referring to FIG. 5, the present invention creates an insulating spacer 80 between the support base 30 and the reflector 10, and a plurality of bosses 82 are mounted on the front and back sides of the insulating spacer 80, wherein the insulating spacers are The front side of the 80, that is, the side in contact with the support base, is provided with four bosses 82, the positions of which correspond to the balun mounting positions 340 of the four support branches on the support base. Four bosses on the insulating spacer are embedded in the balun mounting position on the support branch for positioning.

[0032] On the opposite side of the insulating spacer 80, that is, on the side in contact with the reflecting plate 10, three bosses 82 are provided, and the reflecting plate has a mounting hole 12 matching the boss so that the three bosses are embedded. Into the mounting hole 12, for insulating the inner wall of the mounting hole. Among them, the position of the two bosses in the above three bosses corresponds to the position of the support branch. The first pin on the first feed balun, the first on the second feed balun The three pins directly penetrate the boss on the insulating spacer and are electrically connected to the feeding circuit board at the lower end of the reflector. The bosses on the insulating spacers 80 prevent the first and second feed baluns from being electrically connected directly to the reflectors, ensuring insulation between the two.

[0033] In the creation of the invention, the vibrator is electrically connected between the protruding screw hole of the support base and the reflector, which not only ensures the electrical conductivity of the vibrator and the reflector, but also ensures good intermodulation performance between the two. At the same time, the design of the insulating gasket is added to optimize the intermodulation performance of the vibrator and the feeder board to the whole antenna.

[0034] The broadband dual-polarized radiating element proposed by the present invention supports the frequency band of 1710-2690 MHz, and the relative bandwidth reaches 44.5%. The radiation unit not only realizes ultra-wideband, dual-polarization function, but also has the advantages of simple structure and few components, so it is easy to assemble and can be adapted to mass production. The vibrator is die-cast with a one-piece construction to ensure tolerances and ensure the circuit parameters and radiation performance of the vibrator. The vibrator itself has a compact structure, few components, fewer solder joints, and an insulating spacer with the reflector, which provides better insulation and ensures the intermodulation performance of the antenna. In addition, unlike the conventional feeding mode in which the radiating element and the cable are directly interconnected, the vibrator of the present invention is directly connected to the feeder circuit board, thereby further improving the assembly efficiency of the base station antenna using the vibrator.

The above-described embodiments are merely illustrative of the present invention as a preferred embodiment and are not intended to limit the invention in any way. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention. Therefore, the scope of protection of the patents of the present invention shall be subject to the appended claims.

Claims

Claim

[Claim 1] A broadband dual polarized radiation unit comprising a reflector (10) and mounted to the reflector (

The vibrator (20) of 10), wherein the vibrator (20) has a support base (30), four radiating arms (40) circumferentially arranged at the top of the support base (30), the four radiations The arm (40) constitutes two pairs of orthogonal radiating arms; the support base (30) includes a supporting base (310) and four supports extending from the supporting base away from the reflecting plate (10) a branch (320), each supporting branch (320) supporting a corresponding radiating arm (40); the vibrator (20) is further equipped with a first feeding balun (50) and a second feeding balun (60) The first feed balun (50) and the second feed balun (60) are respectively mounted into corresponding support branches (320).

[Claim 2] The broadband dual-polarization radiating unit according to claim 1, wherein the vibrator

(20) is a half-wave symmetric vibrator, and the arm surface of each of the radiating arms of the vibrator is provided with a fan-shaped hollow structure.

[Claim 3] The broadband dual-polarization radiating unit according to claim 2, wherein each of the radiating arms (40) is connected to a bottom surface thereof with a vibrator protrusion extending in the direction of the reflecting plate (10).

(42), the vibrator protrusion is located at an end away from the support base (30).

[Claim 4] The broadband dual-polarization radiating unit according to claim 1, wherein the first feeding balun (50) comprises a first pin (51) connected in sequence, a first connection a portion (52) and a second pin (53), wherein the first pin and the second pin are respectively mounted in the balun mounting positions (340) of the two supporting branches of the first pair of radiating arms, and the a connecting portion (52) spanning the first pair of radiating arms; the second feeding balun (60) includes a third pin (61), a second connecting portion (62) and a fourth connected in sequence a pin (63), the third pin and the fourth pin are respectively mounted in the balun mounting positions of the two supporting branches of the second pair of radiating arms (340)

And the second connecting portion bridges the second pair of radiating arms.

[Claim 5] The broadband dual-polarization radiating unit according to claim 4, wherein at least one of the first connecting portion (52) and the second connecting portion (62) has a bent portion Preventing the first feed balun and the second feed balun from being short-circuited; the first pin (51) is longer than the second pin (53) so that the first pin runs through the support branch Feed line The third pin (61) is longer than the fourth pin (63) so that the third pin is connected to the feed circuit board after passing through the support branch.

The broadband dual-polarization radiating unit according to claim 4, wherein said first feeding balun is provided with two first balun media cards (71), said two first balun media cards Covering the connection between the first bow I and the first connecting portion, and the connection between the second pin and the first connecting portion respectively;

Each of the radiating arms is provided with a balun positioning slot (410) in communication with the balun mounting position (340), when the first feed balun is coupled to the corresponding first pair of radiating arm pockets, each of the first A balun media card is mounted in the balun positioning groove on the corresponding radiating arm to ensure that the first and second feeding baluns are respectively fixedly connected to the vibrator and insulated from each other.

The broadband dual-polarization radiating unit according to claim 4, wherein a second balun medium card (72) is further mounted on the first and second pins of the first feeding balun, A second balun media card (72) is mounted into the balun mounting position (340) for defining the position of each pin within the balun mounting position (340) to effect the first and second The pin is insulated from the support (30).

The broadband dual-polarization radiating unit according to claim 1, wherein a bottom surface of the support base is provided with a protruding screw hole (330), and the screw hole (330) is fixed with a screw (15) to The vibrator (20) is mounted to the reflector such that the vibrator (20) can continuously acquire an excitation power source from the reflector.

The broadband dual-polarization radiating unit according to claim 4, wherein an insulating spacer (80) is further disposed between the supporting base and the reflecting plate; the reflective plate is provided with a plurality of mounting holes, An insulating spacer (80) is mounted on a side facing the reflecting plate with a boss (82) corresponding to the plurality of mounting holes, the boss being embedded in the plurality of mounting holes for the inner wall of the mounting hole Insulating; the first pin (51) and the third pin (61) respectively pass through the corresponding boss and the mounting hole to maintain the first and second feed baluns and the reflector Insulation.

The broadband dual-polarization radiating unit according to claim 1, wherein an insulating spacer ( ₈₀ ) is further disposed between the supporting base and the reflector; the insulating spacer is facing the branch The boss is also mounted with four bosses (82), and the positions of the four bosses correspond to the balun mounting positions (340) on the four support branches, the four bosses are embedded Positioning is done inside the balun mounting position (340).

[Claim 11] The broadband dual-polarization radiating unit according to claim 1, wherein the support base (3)

0) It also constitutes the balanced balun of the radiating element, which forms a coaxial transmission line with the first feeding balun (50), and forms a coaxial transmission line with the second feeding balun (60) to form a balance.