Low-frequency radiation unit and antenna array

Abstract

The invention discloses a low-frequency radiation unit and an antenna array. The radiation unit comprises a fixed seat, a balance seat, a radiation surface, a reflection baffle plate and a feed assembly. The fixed seat is arranged on the reflecting plate; the balance seat is arranged on the fixed seat; the radiating surface is arranged on the balance seat and is electrically connected with the balance seat; the reflecting baffle is arranged on the balance seat and is lower than the radiating surface; the upper end of the feed assembly is electrically connected with the balance seat, and the lower end serves as feed input; by arranging the reflection baffle on the low-frequency radiation unit, the performance of the high-frequency radiation unit can be improved when the high-frequency radiation unit is nested on the low-frequency radiation unit, the gain of the antenna array is improved, and the use requirement is met.

Description

Technical Field

[0001] The present invention relates to the field of base station antennas, and in particular to a low-frequency radiation unit and an antenna array. Background Art

[0002] With the large-scale construction of 4G / 5G mobile communication networks, the distribution of antennas on sites has become increasingly dense. As an important component of base station antennas, the gain of the radiating unit directly affects the performance of the antenna. Existing base station antennas are usually composed of a reflector, a feeding network, and multiple radiating units. The reflection of the signal depends on the reflector and the isolation strips and baffles on it, which limits the radiation performance of the radiating unit and makes the gain of the radiating unit low. Therefore, a low-frequency radiating unit and an antenna array are urgently needed to solve the above problems. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a low-frequency radiation unit and an antenna array.

[0004] The technical solution adopted by an embodiment of the present invention to solve the technical problem is: a low-frequency radiation unit, including a fixing seat, a balancing seat, a radiation surface, a reflection baffle and a feeding assembly;

[0005] The fixing seat is installed on the reflecting plate;

[0006] The balancing seat is mounted on the fixing seat;

[0007] The radiation surface is mounted on the balance seat and is electrically connected to the balance seat;

[0008] The reflection baffle is arranged on the balance seat and its height is lower than the radiation surface;

[0009] The upper end of the feeding component is electrically connected to the balance seat, and the lower end serves as a feeding input.

[0010] As one of the preferred embodiments of the present invention, the balancing seat includes four balancers extending obliquely upward, each balancer includes two balancing arms; the radiating surface includes four circumferentially arranged radiators, each radiator includes two radiating arms; the feeding assembly includes four feeding cables and two feeding wires;

[0011] The upper end of the balance arm is connected to one end of the radiation arm;

[0012] The feeder cable corresponds to the balancer one by one, the outer conductor of the feeder cable is connected to one balance arm in the balancer, and the upper end of the core of the feeder cable is connected to the other balance arm in the balancer;

[0013] The upper end of the feeder line is connected to the lower ends of the wire cores of two opposite feeder cables, and the lower end of the feeder line serves as a feed input.

[0014] As one of the preferred embodiments of the present invention, a balance arm in the balancer is provided with a plurality of first fixing slots for fixing the outer conductor of the feeder cable; another balance arm in the balancer is provided with a plurality of second fixing slots for fixing the upper end of the core of the feeder cable.

[0015] As one of the preferred embodiments of the present invention, a hook is provided at the upper end of the feeder line for fixing the lower ends of the wire cores of two opposite feeder cables.

[0016] As one of the preferred embodiments of the present invention, a U-shaped groove is provided at the lower end of the feeder line for connecting an external feeder input line as a feeder input.

[0017] As one of the preferred embodiments of the present invention, two adjacent radiators are connected via a first snap-fit ​​socket.

[0018] As one of the preferred embodiments of the present invention, two adjacent radiation arms are connected via a second buckle seat.

[0019] As one of the preferred embodiments of the present invention, a third fixing slot located outside the radiation arm is arranged on the second buckle seat, and an isolation sheet is arranged on the third fixing slot.

[0020] As one of the preferred embodiments of the present invention, the reflective baffle and the balance seat are integrally formed.

[0021] An antenna array, characterized in that it includes a reflector, a feeding network, a plurality of high-frequency radiation units and a plurality of the low-frequency radiation units;

[0022] The low-frequency radiation unit and the high-frequency radiation unit are installed on the reflection surface of the reflection plate, the high-frequency radiation unit is nested on the low-frequency radiation unit, and the reflection baffle is arranged around the high-frequency radiation unit and its height is lower than the radiation surface of the high-frequency radiation unit;

[0023] The feeding network is arranged on the back side of the reflection plate and is connected with the low-frequency radiation unit and the high-frequency radiation unit.

[0024] The beneficial effects of the present invention include: a low-frequency radiation unit and an antenna array, wherein the low-frequency radiation unit comprises a fixing seat, a balancing seat, a radiation surface, a reflection baffle and a feeding assembly; the fixing seat is mounted on the reflection plate; the balancing seat is mounted on the fixing seat; the radiation surface is mounted on the balancing seat and electrically connected to the balancing seat; the reflection baffle is arranged on the balancing seat and its height is lower than the radiation surface; the upper end of the feeding assembly is electrically connected to the balancing seat and the lower end serves as a feeding input; by arranging the reflection baffle on the low-frequency radiation unit, the performance of the high-frequency radiation unit can be improved when the high-frequency radiation unit is nested on the low-frequency radiation unit, thereby improving the gain of the antenna array and meeting the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a top view of an antenna array;

[0027] Figure 2 A bottom view of an antenna array;

[0028] Figure 3 is a side view of an antenna array;

[0029] Figure 4 is a first structural schematic diagram of a low-frequency radiation unit;

[0030] Figure 5 is a second structural schematic diagram of a low-frequency radiation unit;

[0031] Figure 6 This is an exploded diagram of a low-frequency radiating unit. DETAILED DESCRIPTION

[0032] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0033] In the description of the present invention, the meaning of "above", "below", "exceed", etc. is not inclusive of the number itself, and the meaning of "above", "below", "within", etc. is inclusive of the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0036] 1)Reference Figures 1 to 3 The present invention provides an antenna array, including a reflector 600, a feeding network 910, a plurality of high-frequency radiation units 920 and a plurality of the low-frequency radiation units 930; the low-frequency radiation units 930 and the high-frequency radiation units 920 are installed on the reflecting surface of the reflector 600, and the high-frequency radiation units 920 are nested on the low-frequency radiation units 930, wherein the high-frequency radiation units 920 preferably operate in the frequency band of 1710-2170MHz; the feeding network 910 is arranged on the back of the reflector 600 and is connected to the low-frequency radiation units 930 and the high-frequency radiation units 920.

[0037] Specifically, the reflector 600 is made of metal material, is located below the low-frequency radiation unit 930 and the high-frequency radiation unit 920, and has a certain distance from the low-frequency radiation unit 930 (it should be noted that the distance described here is the distance between the bottom of the fixing base 100 and the reflector 600), part of the high-frequency radiation unit 920 is nested in the low-frequency radiation unit 930, and the feeding network 910 is arranged on the back of the reflector 600 and includes a low-frequency feeding network connected to the low-frequency radiation unit 930 and a high-frequency feeding network connected to the high-frequency radiation unit 920; multiple low-frequency radiation units 930 form a number of low-frequency arrays, and multiple high-frequency radiation units 920 form a number of high-frequency arrays.

[0038] 2)Reference Figures 4 to 6 The present invention also provides a low-frequency radiation unit 930, including a fixing seat 100, a balancing seat 200, a radiation surface 300, a reflection baffle 400 and a feeding assembly 500; the fixing seat 100 is mounted on the reflection plate 600, and the two are preferably connected by a buckle 950; the balancing seat 200 is mounted on the fixing seat 100, and the two are preferably connected by screws; the radiation surface 300 is mounted on the balancing seat 200 and is electrically connected to the balancing seat 200; the reflection baffle 400 is arranged on the balancing seat 200 and is lower in height than the radiation surface 300; the upper end of the feeding assembly 500 is electrically connected to the balancing seat 200, and the lower end serves as a feeding input.

[0039] Specifically, when the high-frequency radiation unit 920 is nested in the low-frequency radiation unit 930, the high-frequency radiation unit 920 is inserted into the installation slot 940 of the low-frequency radiation unit 930 and connected to the reflection plate 600 through a snap-on structure, wherein the reflection baffle 400 on the balance seat 200 is arranged around the high-frequency radiation unit 920 and its height is lower than the radiation surface of the high-frequency radiation unit 920, forming a low-frequency radiation unit 930 with its own reflection boundary, which can reflect and superimpose the signal, thereby improving the performance of the high-frequency radiation unit 920.

[0040] 3)Reference Figures 4 to 6 In some embodiments, the balancing seat 200 includes four balancers 210 extending obliquely upward, each balancer 210 includes two balance arms 211; the radiating surface 300 includes four circumferentially arranged radiators 310, each radiator 310 includes two radiating arms 311; the feeding assembly 500 includes four feeding cables 510 and two feeding wires 520; the upper end of the balance arm 211 is connected to one end of the radiating arm 311; the feeding cable 510 corresponds to the balancer 210 one by one, the outer conductor 511 of the feeding cable 510 is connected to one balance arm 211 in the balancer 210, and the upper end of the core 512 of the feeding cable 510 is connected to the other balance arm 211 in the balancer 210; the upper end of the feeding wire 520 is connected to the lower ends of the core 512 of the two opposite feeding cables 510, and the lower end of the feeding wire 520 is used as the feeding input.

[0041] Specifically, the low-frequency radiation unit 930 is preferably a back-fed dipole, preferably operating at 820-960 MHz, and the back-fed dipole is composed of four radiators 310 arranged circumferentially in the horizontal direction, each radiator 310 includes two radiation arms 311 arranged opposite to each other in the horizontal direction, and two adjacent radiators 310 are connected and fixed by a first snap-fit ​​socket 810, and two adjacent radiation arms 311 are connected and fixed by a second snap-fit ​​socket 820.

[0042] Furthermore, the balancing seat 200 is composed of four balancers 210 evenly distributed at four corners, and each balancer 210 has two balance arms 211. Correspondingly, a feeder cable 510 is arranged on the back side of each balancer 210. When connected, the outer conductor 511 of the feeder cable 510 is connected to one balance arm 211 in the balancer 210, and the upper end of the core 512 of the feeder cable 510 is connected to another balance arm 211 in the balancer 210. The balance arm 211 is used to balance the radiation surface 300 and the feed input signal, and the balance arm 211 connected to the core 512 of the feeder cable 510 is used as feeding, and the balance arm 211 connected to the outer conductor 511 of the feeder cable 510 is used as grounding.

[0043] Furthermore, a groove 960 is provided at the bottom end of the balancing seat 200, the upper end of the feed line 520 extends into the groove 960, the lower end of the feed line 520 extends close to the reflector 600, and the lower ends of the cores 512 of the two opposite feed cables 510 are welded together with the upper ends of the feed lines 520 in the groove 960. In some embodiments, a plurality of ventilation holes 970 are provided around the groove 960 for air circulation during welding, to facilitate temperature increase during welding, and to facilitate heat dissipation after welding.

[0044] 4)Reference Figures 4 to 6 In some embodiments, a plurality of first fixing slots 710 are provided on a balancing arm 211 in the balancer 210 for fixing the outer conductor 511 of the feeder cable 510; a plurality of second fixing slots 720 are provided on another balancing arm 211 in the balancer 210 for fixing the upper end of the core 512 of the feeder cable 510; wherein, the outer conductor 511 of the feeder cable 510 and the first fixing slots 710 and the upper end of the core 512 of the feeder cable 510 and the second fixing slots 720 are fixed by welding, and this setting can not only fix the feeder cable 510, but also improve the intermodulation stability.

[0045] 5)Reference Figures 4 to 6 In some embodiments, a hook 521 is provided at the upper end of the feed line 520 for fixing the lower ends of the wire cores 512 of the two opposite feed cables 510; the hook 521 is provided to facilitate the feeding connection of the two opposite feed cables 510; further, a U-shaped groove 522 is provided at the lower end of the feed line 520 for connecting an external feed input line as a feed input; it can facilitate the welding between the external feed input cable and the feed line 520 as a feed input.

[0046] 6)Reference Figures 3 to 6 In some embodiments, a third fixing slot 730 located outside the radiation arm 311 is provided on the second snap seat 820, and an isolation plate 830 is provided on the third fixing slot 730; the isolation plate 830 is provided to improve the isolation degree of the radiation surface 300; and the reflection baffle 400 is preferably integrally formed with the balance seat 200 and forms an angle of 60° with the horizontal plane.

[0047] 7) The above embodiment is for the antenna array without low-frequency combining. If low-frequency combining is required, the low-frequency feeding network can be modified; for details, refer to Figure 3, using a combined feeding network, the combined feeding network (phase shifter) includes a cavity 110, a PCB board 120, a PCB board 130 and a pin 140, wherein the pin 140 connects the PCB board 120 and the PCB board 130, and is used for the welding feeding connection of the PCB board 120 and the PCB board 130, the PCB board 120 performs phase shifting for the A frequency band, and the PCB board 130 performs phase shifting for the B frequency band, and an open-circuit filtering design is used on the branches of the PCB board 120 and the PCB board 130; further, the phase shifter has a dielectric block inside, which functions to change the impedance of the covering line, which is beneficial to impedance matching and winding operations, and at the same time, the open mold design improves consistency; it should be noted that the PCB board is only one case of the embodiment, and also includes but is not limited to copper tubes, metal strips and other similar structures.

[0048] 8) After simulation and actual measurement verification, Figure 1-3 In the base station antenna array shown, the standing wave of any column of antennas is less than 1.4, the isolation is less than -25dB, the half-power beamwidth is in the range of 60-70°, and the third-order intermodulation index is less than -107dB. Compared with the traditional form, the base station antenna has the same high-frequency radiation unit and the same array, and the low-frequency gain is increased by 0.5dB i, the radiation efficiency is increased by 10%, the high-frequency bandwidth is reduced by 4 degrees, the high-frequency gain is increased by 0.3dB i, the cable length is reduced by 64%, and the number of solder joints is reduced by 20%. It has strong competitiveness in today's multi-band high-gain and high-efficiency antenna base station market. Furthermore, the back-feeding design of the low-frequency radiation unit 930 facilitates integration with the feeding network 910, reduces signal loss during transmission, and improves radiation efficiency. The low-frequency radiation unit 910 has its own reflection boundary, which can improve the performance of the high-frequency radiation unit, and proposes a solution for the integration of the combined circuit.

[0049] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A low-frequency radiation unit, characterized in that: It comprises a fixing seat (100), a balancing seat (200), a radiating surface (300), a reflection baffle (400) and a feeding assembly (500); The fixing seat (100) is installed on the reflecting plate (600); The balancing seat (200) is mounted on the fixing seat (100); The radiation surface (300) is mounted on the balance seat (200) and is electrically connected to the balance seat (200); The reflection baffle (400) is arranged on the balance seat (200) and has a height lower than the radiation surface (300); The upper end of the feeding component (500) is electrically connected to the balancing seat (200), and the lower end serves as a feeding input.

2. A low-frequency radiation unit according to claim 1, characterized in that: The balancing seat (200) comprises four balancers (210) extending obliquely upward, each of the balancers (210) comprising two balancing arms (211); the radiating surface (300) comprises four radiators (310) arranged circumferentially, each of the radiators (310) comprising two radiating arms (311); the feeding assembly (500) comprises four feeding cables (510) and two feeding lines (520); The upper end of the balance arm (211) is connected to one end of the radiation arm (311); The feeder cable (510) corresponds to the balancer (210) one by one, the outer conductor (511) of the feeder cable (510) is connected to one balance arm (211) in the balancer (210), and the upper end of the core (512) of the feeder cable (510) is connected to another balance arm (211) in the balancer (210); The upper end of the feeder line (520) is connected to the lower ends of the wire cores (512) of the two opposite feeder cables (510), and the lower end of the feeder line (520) serves as a feed input.

3. A low-frequency radiation unit according to claim 2, characterized in that: A plurality of first fixing slots (710) are provided on one of the balancing arms (211) in the balancer (210) for fixing the outer conductor (511) of the feeder cable (510); and a plurality of second fixing slots (720) are provided on another of the balancing arms (211) in the balancer (210) for fixing the upper end of the wire core (512) of the feeder cable (510).

4. A low-frequency radiation unit according to claim 2, characterized in that: The upper end of the feeder line (520) is provided with a hook (521) for fixing the lower ends of the wire cores (512) of the two opposite feeder cables (510).

5. A low-frequency radiation unit according to claim 2, characterized in that: The lower end of the feeder line (520) is provided with a U-shaped groove (522) for connecting an external feeder input line to serve as a feeder input.

6. A low-frequency radiation unit according to claim 2, characterized in that: Two adjacent radiators (310) are connected via a first buckle seat (810).

7. A low-frequency radiation unit according to claim 2, characterized in that: Two adjacent radiation arms (311) are connected via a second buckle seat (820).

8. A low frequency radiation unit according to claim 4, characterized in that: The second buckle seat (820) is provided with a third fixing slot (730) located outside the radiation arm (311), and the third fixing slot (730) is provided with an isolation sheet (830).

9. A low-frequency radiation unit according to claim 1, characterized in that: The reflective baffle (400) and the balancing seat (200) are integrally formed.

10. An antenna array, characterized in that: It comprises a reflection plate (600), a feeding network (910), a plurality of high-frequency radiation units (920), and a plurality of low-frequency radiation units according to any one of claims 1 to 9; The low-frequency radiation unit and the high-frequency radiation unit (920) are installed on the reflection surface of the reflection plate (600), the high-frequency radiation unit (920) is nested on the low-frequency radiation unit, and the reflection baffle (400) is arranged around the high-frequency radiation unit (920) and has a height lower than the radiation surface of the high-frequency radiation unit (920); The feeding network (910) is arranged on the back side of the reflection plate (600) and is connected to the low-frequency radiation unit and the high-frequency radiation unit (920).

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