A boundary device for a small cell base station antenna

Abstract

The utility model relates to communication base station antenna technical field especially is concerned about a kind of boundary device of miniaturized base station antenna, including reflector and radiating unit, reflector is provided with radiating unit, reflector is also provided with metal isolation frame, metal isolation frame is surrounded in the periphery of radiating unit, for the isolation to radiating unit, metal isolation frame is octagon, installation space that can accommodate radiating unit is formed in the middle of metal isolation frame, metal isolation frame has two end heads and eight bending boundaries, installation hole is set up in two end heads, the metal isolation frame of enclosure is fixed through the installation hole on two end heads.The boundary device of miniaturized base station antenna is set through octagonal metal isolation frame, on the basis of miniaturization, can isolate radiating unit, improve call quality, optimize horizontal plane lobe width, cross-polarization ratio 0 and cross-polarization ratio, improve the isolation of complete machine, reduce the index such as the standing wave ratio of complete machine.

Description

Technical Field

[0001] This utility model relates to the field of communication base station antenna technology, and in particular to a boundary device for a miniaturized base station antenna. Background Technology

[0002] Base station antennas are a key component of outdoor coverage in communication systems; all communication systems rely on this crucial system. With the development of wireless communication technology, in today's information age, user demand for data services is growing exponentially. This has led to an increasing density of base station construction, making site selection increasingly difficult for mobile operators. The development of LTE has further increased the demand for the number and density of base stations, posing a significant challenge to future site selection. Compared to traditional base station antennas, miniaturized base station antennas reduce volume by more than 50%.

[0003] Due to the reduction in size, existing miniaturized base station antennas have all experienced reductions in the width of the reflector, the height of the antenna element from the reflector, and the distance between the elements. This reduces the isolation between adjacent ports, causing the two polarizations of the base station antenna to interfere with each other, leading to a decrease in antenna performance and even affecting communication quality. For example, patent CN118198746A discloses an antenna array with a radiation boundary device, which improves isolation by setting isolation plates between each antenna array. However, due to size limitations, long strip isolation plates are not suitable for miniaturized base station antennas. Utility Model Content

[0004] To address the issue of reduced isolation caused by size limitations in existing miniaturized base station antennas, this invention provides a boundary device for a miniaturized base station antenna. By setting an octagonal metal isolation frame, miniaturization is achieved while isolating the radiating elements, improving call quality, optimizing horizontal beamwidth, cross-polarization ratio 0°, and cross-polarization ratio, thereby improving overall isolation and reducing overall VSWR and other indicators.

[0005] This invention provides a boundary device for a miniaturized base station antenna, including a reflector and a radiating element. The radiating element is disposed on the reflector, and a metal isolation frame is also disposed on the reflector, surrounding the radiating element for isolation. Through the cooperation of the metal isolation frame and the radiating element, not only is miniaturization achieved, but call quality is also significantly improved, and key performance indicators such as horizontal beamwidth, cross-polarization ratio (0°), and cross-polarization ratio are optimized, ensuring that the base station antenna maintains stable and efficient communication performance despite miniaturization.

[0006] Furthermore, the metal isolation frame is octagonal, with an installation space at the center that can accommodate the radiating units. This maximizes isolation within a limited space, effectively reducing electromagnetic interference between adjacent radiating units.

[0007] Furthermore, the metal isolation frame has two ends and eight bends, with mounting holes on both ends. The enclosed metal isolation frame is fixed through these mounting holes, making installation and disassembly of the isolation frame convenient.

[0008] Furthermore, several positioning plates are provided at the bottom of the metal isolation frame. These positioning plates are bent towards the installation space and have positioning holes. The metal isolation frame is fixed to the reflector plate through these positioning plates, ensuring stable installation of the metal isolation frame.

[0009] Furthermore, at least one coupling slot is provided on the metal isolation frame to optimize impedance matching and radiation pattern. This can block certain harmful current paths and guide current flow in a direction favorable to main beamforming, increasing coverage distance and improving the antenna's front-to-back ratio.

[0010] Furthermore, the radiating unit is made of die-cast aluminum alloy and is a high-frequency radiating unit. The die-cast aluminum alloy material not only ensures the strength and durability of the radiating unit, but also helps to improve the signal transmission efficiency of the radiating unit due to its good conductivity.

[0011] Furthermore, the radiating element operates in the frequency band of 1695MHz~2690MHz, and the radiating element is a miniaturized broadband oscillator. The miniaturized broadband oscillator not only effectively reduces the physical size of the radiating element, making it more suitable for space-constrained base station environments, but also maintains high-efficiency radiation performance, ensuring the breadth and depth of signal coverage.

[0012] Furthermore, a director plate is positioned directly above the radiating element to adjust the horizontal beamwidth. This effectively guides the propagation direction of electromagnetic waves, thereby enabling precise adjustment of the horizontal beamwidth.

[0013] The beneficial effects of this utility model are as follows: This invention provides a boundary device for a miniaturized base station antenna. Through the synergistic effect of an octagonal metal isolation frame and a radiating element, it significantly improves call quality and key performance indicators while achieving antenna miniaturization. It also optimizes the horizontal beamwidth to ensure uniform signal coverage and increases the cross-polarization ratio (0°) and cross-polarization ratio, effectively reducing signal interference and distortion, thereby enhancing communication stability and reliability. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is an assembly diagram of the metal isolation frame; Figure 2 This is an unfolded diagram of the metal isolation frame; Figure 3 It is a plan view of the metal isolation frame; Figure 4 This is a schematic diagram of the boundary device. Figure 5 This is a waveform diagram of the horizontal lobe width and cross-polarization ratio without the addition of an octagonal metal isolation frame; Figure 6 It increases the horizontal beamwidth of the octagonal metal isolation frame, and the cross-polarization ratio waveform diagram; Figure 7 It is a standing wave isolation waveform diagram with an added octagonal metal isolation frame; In the figure: 1. Radiation unit, 2. Metal isolation frame, 21. End, 22. Bending boundary, 23. Mounting hole, 24. Positioning plate, 241. Positioning hole, 25. Coupling groove, 3. Guide plate. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0016] To improve the isolation of miniaturized base station antennas and ensure communication quality, a boundary device for miniaturized base station antennas is designed, such as... Figure 1 As shown, it includes a reflector and a radiating unit 1. The radiating unit 1 is provided on the reflector, and a metal isolation frame 2 is also provided on the reflector. The metal isolation frame 2 surrounds the radiating unit 1 and is used to isolate the radiating unit 1 to improve the call quality. This achieves the optimization and improvement of indicators such as horizontal beamwidth, cross-polarization ratio 0°, cross-polarization ratio, isolation degree and standing wave ratio.

[0017] like Figure 4As shown, the metal isolation frame 2 is octagonal, with an installation space in the center to accommodate the radiation unit 1. The non-linear edges of the octagon are composed of multiple bent boundaries 22. When electromagnetic waves reach these edges, they are dispersed in multiple different directions, rather than producing a uniform and strong diffraction wave as with long, straight edges. This multi-directional scattering disperses and cancels out the diffraction energy, thereby reducing interference with the main radiation direction. The octagonal structure, through its unique geometry, effectively reduces the longest diffraction path in a single direction, thus improving the overall shielding effectiveness against electromagnetic waves in a specific frequency band.

[0018] like Figure 2 and 3 As shown, in order to facilitate the quick installation and fixation of the isolation frame, the metal isolation frame 2 has two ends 21 and eight bending boundaries 22. Mounting holes 23 are provided on both ends 21, and the enclosed metal isolation frame 2 is fixed through the mounting holes 23 on the two ends 21.

[0019] like Figure 1 As shown, in order to facilitate the stable installation of the isolation frame on the reflector, the bottom of the metal isolation frame 2 is provided with several positioning plates 24. The positioning plates 24 are bent towards the installation space and positioning holes 241 are provided on the positioning plates 24. The metal isolation frame 2 is fixed to the reflector through the positioning plates 24.

[0020] At least one coupling slot 25 is provided on the metal isolation frame 2 for optimizing impedance matching and radiation pattern. The coupling slot 25 can adjust the electromagnetic coupling between the radiating elements 1, further optimizing the performance of the miniaturized base station antenna.

[0021] Radiation unit 1 is made of die-cast aluminum alloy and is a high-frequency radiation unit. Die-cast aluminum alloy is lightweight, high-strength, and corrosion-resistant, which well meets the requirements for long-term stable operation of the radiation unit in complex environments. The design of the high-frequency radiation unit gives it excellent radiation characteristics within its operating frequency band, efficiently converting electrical energy into electromagnetic waves and radiating them, thereby ensuring the signal transmission quality of the miniaturized base station antenna.

[0022] Radiation element 1 operates in the frequency band of 1695MHz~2690MHz and is a miniaturized broadband vibrator. The compact structure of the miniaturized broadband vibrator enables wide-band radiation within a limited space, meeting the multi-band operation requirements of miniaturized base station antennas. Radiation element 1 can effectively cover multiple communication frequency bands, ensuring stable signal transmission across different frequency bands.

[0023] A director plate 3 is positioned directly above the radiating element 1 to adjust the horizontal beamwidth. The director plate 3 is made of a lightweight material with good electrical conductivity, ensuring effective guidance of electromagnetic wave propagation without affecting the overall weight of the antenna.

[0024] like Figures 5-7 As shown, after adding the metal isolation frame 2, the antenna VSWR decreased from 1.7 to below 1.5, the isolation increased to -24.624dB, the horizontal beamwidth was optimized to 67.72°, and the cross-polarization ratio XPD(0) increased to 29.61dB. The horizontal beamwidth, cross-polarization ratio 0°, cross-polarization ratio, VSWR and other indicators were significantly optimized, which is significantly better than the state without the addition.

[0025] The above description is illustrative only and not restrictive of this utility model. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the appended claims, and all such modifications, variations or equivalents will fall within the protection scope of this utility model.

Claims

1. A boundary device for a miniaturized base station antenna, comprising a reflector and a radiating element (1), wherein the radiating element (1) is disposed on the reflector, characterized in that: A metal isolation frame (2) is also provided on the reflector plate. The metal isolation frame (2) surrounds the radiation unit (1) and is used to isolate the radiation unit (1).

2. The boundary device for a miniaturized base station antenna according to claim 1, characterized in that: The metal isolation frame (2) is octagonal, and the middle of the metal isolation frame (2) forms an installation space that can accommodate the radiation unit (1).

3. The boundary device for a miniaturized base station antenna according to claim 2, characterized in that: The metal isolation frame (2) has two ends (21) and eight bending boundaries (22). Mounting holes (23) are provided on both ends (21). The enclosed metal isolation frame (2) is fixed through the mounting holes (23) on the two ends (21).

4. The boundary device for a miniaturized base station antenna according to claim 3, characterized in that: The metal isolation frame (2) has several positioning plates (24) at its bottom. The positioning plates (24) are bent toward the installation space. Positioning holes (241) are opened on the positioning plates (24). The metal isolation frame (2) is fixed to the reflector plate through the positioning plates (24).

5. The boundary device for a miniaturized base station antenna according to claim 4, characterized in that: At least one coupling slot (25) is provided on the metal isolation frame (2) for optimizing impedance matching and radiation pattern.

6. The boundary device for a miniaturized base station antenna according to claim 1, characterized in that: The radiation unit (1) is made of die-cast aluminum alloy and is a high-frequency radiation unit (1).

7. The boundary device for a miniaturized base station antenna according to claim 6, characterized in that: The operating frequency band of the radiating unit (1) is 1695MHz~2690MHz, and the radiating unit (1) is a miniaturized broadband oscillator.

8. The boundary device for a miniaturized base station antenna according to claim 7, characterized in that: A guide plate (3) is provided directly above the radiation unit (1) to adjust the width of the horizontal beam.

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