Wave absorber unit and antenna support

Abstract

The invention relates to a wave absorber unit and an antenna support. Each wave absorber unit is composed of a pattern layer, a substrate layer and a base layer which are sequentially stacked from top to bottom, the pattern layers, the substrate layers and the base layers are made of non-metallic materials, each pattern layer is composed of a plurality of nested open circular rings, and the opening directions of every two adjacent open circular rings are different. By adopting the wave absorber unit provided by the invention, electromagnetic waves in a high-frequency broadband range can be absorbed, and the wave absorber unit is suitable for performing electromagnetic protection on an antenna in 5G communication.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic shielding, and in particular to an absorber unit and an antenna bracket. Background Art

[0002] Low-altitude network is the guarantee for the development of low-altitude UAV mobile communication services today. The air-ground integrated antenna is the bridge for communication between UAV terminals and base station control equipment. In order to meet the rapid development of the low-altitude communication industry, a considerable number of air-ground integrated base station antennas must be installed to meet the low-altitude business's higher requirements for network service quality, signal coverage, interference avoidance, etc.

[0003] When deploying air-to-ground integrated base station antennas around substations, broadband strong magnetic fields may be generated around the antennas due to the high-voltage arcs in the substations and the extremely narrow pulse waves caused by extreme weather. The strong magnetic field has a large bandwidth and covers the high-frequency broadband bands required for 5G communications by drones, which will not only damage the antenna equipment, but also cause significant interference to the antenna coverage, resulting in an increase in the signal-to-noise ratio and affecting drone operations.

[0004] There are three traditional theoretical shielding measures: metal plates, metal grids, and metamaterial absorbers. The first two materials are too heavy, and setting them on the antenna will bring high safety risks and affect the antenna's radiation pattern. Metamaterial absorbers generally use a resonant structure of metal materials to absorb waves. However, since this scenario needs to absorb interfering electromagnetic waves in the high-frequency band used by 5G communications, the use of metal absorbers will cause large currents in the resonant structure and there is a risk of burning.

[0005] Therefore, how to provide an electromagnetic protection structure so that the electromagnetic protection structure is suitable for the antenna and can effectively shield the interfering electromagnetic waves in the high-frequency broadband frequency band required for 5G communication is a problem that needs to be solved at present. Summary of the invention

[0006] Based on this, it is necessary to provide an absorber unit and an antenna bracket to address the above technical problems.

[0007] In a first aspect, the present application provides an absorber unit, the absorber unit comprising a pattern layer, a substrate layer and a base layer stacked sequentially from top to bottom, the pattern layer, the substrate layer and the base layer being made of non-metallic materials, wherein:

[0008] The pattern layer is composed of a plurality of nested open circular rings, and the opening directions of two adjacent open circular rings are different.

[0009] In one embodiment, the pattern layer and the base layer are made of ITO indium tin oxide material, and the substrate layer is made of PET polyethylene terephthalate material.

[0010] In one embodiment, the open circular ring includes a first open circular ring, a second open circular ring and a third open circular ring, wherein the center radius of the first open circular ring is determined according to the boundary frequency of the target absorption frequency band of the absorber, the center radius of the second open circular ring is determined according to the absorption center frequency of the first open circular ring, and the center radius of the third open circular ring is determined according to the absorption center frequency of the second open circular ring.

[0011] In a second aspect, the present application further provides an antenna bracket, comprising a support frame and an electromagnetic shielding panel, wherein the electromagnetic shielding panel is composed of a plurality of absorber units arranged in an array, and the absorber unit is the absorber unit described in any of the aforementioned embodiments, wherein:

[0012] The support frame includes a support rod, one end of which is connected to the antenna, and the other end of which is connected to the holding pole;

[0013] The electromagnetic shielding panel is installed on the supporting pole and is located between the antenna and the holding pole, and the pattern layer of each absorber unit on the electromagnetic shielding panel faces the holding pole.

[0014] In one embodiment, the support frame further comprises a telescopic rod, the telescopic rod comprises an outer sleeve rod and an inner sleeve rod, the outer sleeve rod is sleeved on the inner sleeve rod, and the inner sleeve rod can slide along the radial direction of the outer sleeve rod;

[0015] The telescopic rod is installed below the supporting rod, and one end of the telescopic rod is connected to the antenna, and the other end of the telescopic rod is connected to the holding rod.

[0016] In one of the embodiments, the support rod is fixed to the holding rod by a first U-shaped clamping device, the telescopic rod is fixed to the holding rod by a second U-shaped clamping device, and a first mounting hole and a second mounting hole are provided on the electromagnetic shielding panel. The first U-shaped clamping device passes through the first mounting hole to fix the electromagnetic shielding panel to the support rod, and the second U-shaped clamping device passes through the second mounting hole to fix the electromagnetic shielding panel to the telescopic rod.

[0017] In one embodiment, the support frame also includes a folding rod, which is composed of a first connecting rod and a second connecting rod, the second end of the first connecting rod is rotatably connected to the first end of the second connecting rod, and the first end of the first connecting rod is connected to one end of the telescopic rod, and the first end of the second connecting rod is connected to the other end of the telescopic rod.

[0018] In one embodiment, the second end of the first connecting rod is provided with a plurality of pin holes, and after pins are inserted into the pin holes, the angle between the first connecting rod and the second connecting rod is fixed.

[0019] In one embodiment, the inner sleeve rod is provided with a fixing bolt hole, and the outer sleeve rod is provided with a fixing bolt slot. After the fixing bolt is inserted into the fixing bolt hole through the fixing bolt slot, the relative position between the inner sleeve rod and the outer sleeve rod is fixed.

[0020] In one embodiment, the pin hole is marked with an antenna pitch angle scale, and the antenna pitch angle scale is determined based on the length of the antenna, the length of the first connecting rod, the length of the second connecting rod, and the angle between the first connecting rod and the second connecting rod after the pin is inserted into the pin hole.

[0021] The absorber unit and antenna bracket, aiming at the absorption of electromagnetic waves in high-frequency broadband band, propose to use non-metallic open rings with different opening directions as resonant structures in the absorber unit, and also use non-metallic substrate layers and base layers. The use of non-metallic materials can increase the resistance of the absorber unit, reduce the surface current of the pattern layer, reduce the risk of burning, and reduce the weight of the absorber unit. At the same time, the use of open rings as resonant structures can make the curvature of the resonant structure change more smoothly, and can further avoid the increase of current at places where the curvature changes greatly, causing the resonant structure to burn. Since the resonant structure is open, the resonant structure can form an open circuit, so that the current oscillates in the resonant structure, which is convenient for the rapid loss of large current and improves the electromagnetic shielding efficiency of the absorber unit. In order to avoid the strong electromagnetic mutual coupling phenomenon caused by large current at the opening of each ring to affect the absorbing effect, the opening directions of the two adjacent rings are set differently, so that the spacing between the openings can be increased, and the probability of electromagnetic mutual coupling can be reduced. The absorber unit provided in the embodiment of the present application can absorb high-frequency electromagnetic waves, is not easy to burn, and is suitable for installation on the antenna due to its light weight. Therefore, it can be installed on the air-to-ground integrated base station antenna near the substation, and has a good absorption effect on the interference electromagnetic waves in the 5G communication frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of an absorber unit in one embodiment;

[0023] Figure 2 is an equivalent circuit diagram of an absorber unit in one embodiment;

[0024] Figure 3 is a schematic diagram of the dimensions of an absorber unit in one embodiment;

[0025] Figure 4 is a schematic diagram of an antenna bracket in one embodiment;

[0026] Figure 5 is a schematic diagram of an electromagnetic shielding panel in one embodiment;

[0027] Figure 6 is a schematic diagram of an antenna bracket including a telescopic rod in one embodiment;

[0028] Figure 7 is a schematic diagram of an antenna support including a folding rod in one embodiment;

[0029] Figure 8 A schematic diagram of a pin hole being provided on a folding rod in one embodiment;

[0030] Fig. 9 It is a schematic diagram of a fixing bolt slot provided on a telescopic rod in an embodiment. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In one embodiment, Figure 1As shown, an absorber unit is provided, which consists of a pattern layer, a substrate layer and a base layer stacked in sequence from top to bottom, the pattern layer, the substrate layer and the base layer are made of non-metallic materials, wherein the pattern layer consists of a plurality of nested open circular rings, and the opening directions of two adjacent open circular rings are different.

[0035] In the embodiment of the present application, the pattern layer and the base layer of the absorber unit are used to interact with the electromagnetic waves incident on the absorber to convert the energy of the electromagnetic waves into heat energy, electrical energy, etc. The substrate layer is used to support the pattern layer and the base layer, and can be used to dissipate the heat energy and electrical energy obtained by the electromagnetic wave conversion to improve the wave absorption efficiency.

[0036] The pattern layer and the base layer can be made of non-metallic conductive materials, and the substrate layer can be made of non-metallic conductive or non-conductive materials. The thickness and conductivity of the pattern layer, the substrate layer and the base layer can be determined according to the specific electromagnetic wave frequency to be absorbed.

[0037] The pattern layer is composed of multiple nested open rings, and the openings are used to make the rings form an open circuit, so that the induced current generated by the electromagnetic wave on the surface of the pattern layer can be lost by the substrate layer while oscillating in the open circuit. The substrate layer can be made of a material with a higher resistance to accelerate the loss of the induced current. Figure 1 The open ring shown in the figure has one opening, but in fact the open ring can also have multiple openings, as long as the open ring can form an open circuit. The specific number of openings and the width of the openings can be determined by technicians in this field according to the frequency of electromagnetic waves to be absorbed.

[0038] Each open circular ring can absorb electromagnetic waves within a specific frequency band. Since the frequency band that a single open circular ring can absorb is relatively narrow, and the frequency band used in 5G communication is generally wider, multiple open circular rings can be nested to expand the frequency band of electromagnetic waves that the absorber can absorb. According to the target frequency band that needs to be absorbed, first design an open circular ring that can absorb electromagnetic waves at the upper boundary frequency of the target frequency band, and an open circular ring at the lower boundary frequency of the target frequency band, and then determine the remaining frequency band that needs to be absorbed in the target frequency band based on the frequency band that these two open circular rings can absorb. Furthermore, the minimum distance that can prevent interference between two adjacent open circular rings can be pre-set, and then, based on the minimum distance between each circular ring, design multiple open circular rings that can cover the remaining frequency bands that need to be absorbed and whose distances between each other are greater than the minimum distance, and nest each open circular ring to complete the design for the pattern layer.

[0039] The opening directions of two adjacent open circular rings in the pattern layer should be different, and the opening directions of non-adjacent open circular rings can be the same or different. Figure 1As shown in the figure, when there are three open rings, the opening directions of the adjacent first and second open rings, and the second and third open rings are different, but the directions of the first and third open rings are the same. Since absorbing electromagnetic waves in the 5G frequency band will cause a large induced current on the pattern layer, if the opening directions of two adjacent open rings are the same, a strong electromagnetic mutual coupling phenomenon may occur at the opening, resulting in a narrower frequency band range that each open ring can absorb. Therefore, setting the opening directions of adjacent open rings differently can improve the stability of the absorber unit's absorbing ability.

[0040] The absorber unit provided in the embodiment of the present application is aimed at absorbing electromagnetic waves in a high-frequency broadband band. It is proposed to use a non-metallic open ring with different opening directions as a resonant structure in the absorber unit, and also use a non-metallic substrate layer and base layer. The use of non-metallic materials can increase the resistance of the absorber unit, reduce the surface current of the pattern layer, reduce the risk of burning, and can also reduce the weight of the absorber unit. At the same time, the use of an open ring as a resonant structure can make the curvature of the resonant structure change more smoothly, and can further avoid the increase of current at the place where the curvature changes greatly, causing the resonant structure to burn. Since the resonant structure is open, the resonant structure can form an open circuit, so that the current oscillates in the resonant structure, which is convenient for the rapid loss of large current and improves the electromagnetic shielding efficiency of the absorber unit. In order to avoid the strong electromagnetic mutual coupling phenomenon caused by large current at the opening of each ring to affect the absorbing effect, the opening directions of the two adjacent rings are set differently, so that the spacing between each opening can be increased, and the probability of electromagnetic mutual coupling can be reduced. The absorber unit provided in the embodiment of the present application can absorb high-frequency electromagnetic waves, is not easy to burn, and is suitable for installation on the antenna due to its light weight. Therefore, it can be installed on the air-to-ground integrated base station antenna near the substation, and has a good absorption effect on the interference electromagnetic waves in the 5G communication frequency band.

[0041] In one embodiment, the pattern layer and the base layer are made of ITO indium tin oxide material, and the substrate layer is made of PET polyethylene terephthalate material.

[0042] In the embodiment of the present application, ITO material is used to form the pattern layer and the base layer. ITO material is light in weight, can absorb a wide frequency band of electromagnetic waves, has good conductivity and stability, and is not easy to burn. Therefore, the use of ITO material to form the pattern layer and the base layer can improve the safety of the absorber unit when it is installed on the antenna, and at the same time ensure the stability of the absorber unit's absorbing performance in substations and extreme weather environments. Furthermore, since the ITO material can absorb a wide frequency band, the number of open circular rings that need to be included in the absorber unit pattern layer can be reduced, reducing the difficulty of processing.

[0043] The substrate layer is made of PET material, which is also light and stable, and can improve the safety of the absorber unit when it is installed on the antenna.

[0044] In one embodiment, the open circular ring includes a first open circular ring, a second open circular ring and a third open circular ring, wherein the open circular ring includes a first open circular ring, a second open circular ring and a third open circular ring, wherein the center radius of the first open circular ring is determined according to the boundary frequency of the target absorption frequency band of the absorber, the center radius of the second open circular ring is determined according to the absorption center frequency of the first open circular ring, and the center radius of the third open circular ring is determined according to the absorption center frequency of the second open circular ring.

[0045] In the embodiment of the present application, three open circular rings are used to absorb electromagnetic waves in the target absorption frequency band that the absorber needs to absorb, which are the first open circular ring, the second open circular ring and the third open circular ring from the outside to the inside. Since parameters such as material, opening direction, opening size, circular ring width, circular ring radius, and the distance between each circular ring all have an impact on the frequency that the absorber can absorb, it is difficult to accurately design the absorber through simple theoretical calculations. Therefore, it is possible to first estimate the center radius that has the greatest impact on the frequency that can be absorbed based on the frequency that the circular ring needs to absorb, and then adjust and experiment with the shape of the circular ring through simulation software, and finally obtain the various open circular rings that can absorb the target absorption frequency band when combined.

[0046] When electromagnetic waves induce induced current on the surface of the pattern layer, the openings on each open ring can cause the current to flow from one ring to another, so that the grooves formed between the rings can be equivalent to distributed capacitance. Figure 2 As shown in the figure, it is the equivalent circuit of the pattern layer when three rings are set. Among them, L represents inductance, R represents resistance, and C represents capacitance. The size of capacitance can be estimated by formula (1):

[0047] Formula (I)

[0048] in, is the inductance per unit length of the ring, and r is the center radius of the ring.

[0049] The size of the inductor can be estimated using formula (II):

[0050] Formula (II)

[0051] in, It refers to the center radius of the outermost ring (the first open ring), and d refers to the distance between the first open ring and the second open ring. is the magnetic permeability of a vacuum.

[0052] The boundary frequency that the first open ring can absorb is related to the inductance and capacitance of the equivalent circuit. See formula (III):

[0053] Formula (III)

[0054] in, is the boundary frequency.

[0055] Therefore, in order to enable the first open circular ring to absorb the boundary frequency of the target absorption frequency band, the central radius of the first open circular ring can be determined according to formula (1), formula (2) and formula (3) accordingly.

[0056] The center frequency that the first open ring can absorb is related to the center radius of the second open ring. For details, please refer to formula (IV):

[0057] Formula (IV)

[0058] in, is the center radius of the second open ring, is the relative dielectric constant of the open ring. c is the speed of light.

[0059] The absorption center frequency of the first open circular ring can be determined according to the principle that the frequency absorbed by each circular ring is continuous and the ability to absorb electromagnetic waves of each frequency in the target absorption frequency band is similar, and the center radius of the second open circular ring can be estimated based on the absorption center frequency and formula (IV). After obtaining the center radius of the second open circular ring, the center radius of the third open circular ring can be determined based on the center radius of the second open circular ring, the absorption center frequency set for the second open circular ring, and formula (IV).

[0060] According to the center radius of each open circular ring, each open circular ring is adjusted and simulated in the simulation software to complete the design of the pattern layer.

[0061] Reference Figure 3 As shown, an example of specific size parameters of an absorber unit that can absorb interference electromagnetic waves in the frequency band of 1710 GHz to 5000 GHz, that is, the frequency band used for 5G communications. Figure 3 In the figure, the base layer (the ITO substrate in the dark gray part) is set to 8mm, the pattern layer (the ITO substrate in the white part) is set to 0.2mm, and the substrate layer is also set to 0.2mm.

[0062] The centers of the first open circular ring, the second open circular ring, and the third open circular ring are the same. The outer diameter of the first open circular ring is 16.2mm, the inner diameter is 12.2mm, the opening is toward the bottom of the absorber unit, and the opening width is 6mm; the outer diameter of the second open circular ring is 9.1mm, the inner diameter is 7.1mm, the opening is toward the top of the absorber unit, and the opening width is 4.3mm; the outer diameter of the third open circular ring is 5.7mm, the inner diameter is 3.7mm, the opening is toward the bottom of the absorber unit, and the opening width is 2.5mm. The use of this absorber unit can reduce interference in drone communications when the drone uses any 5G method for communication.

[0063] In one embodiment, Figure 4 As shown, an antenna bracket is provided, including a supporting frame and an electromagnetic shielding panel, the electromagnetic shielding panel is composed of a plurality of absorber units arranged in an array, the absorber unit is the absorber unit of any of the aforementioned embodiments, wherein: the supporting frame includes a supporting rod, one end of the supporting rod is connected to the antenna, and the other end is connected to the holding pole; the electromagnetic shielding panel is installed on the supporting rod and is located between the antenna and the holding pole, and the pattern layer of each absorber unit on the electromagnetic shielding panel faces the holding pole.

[0064] In the embodiment of the present application, after a plurality of absorber units are combined into an electromagnetic shielding panel, the electromagnetic shielding panel can be installed on a support frame for supporting an antenna to achieve electromagnetic protection for the antenna.

[0065] The support frame includes a support rod, which may be one or more support rods, and the embodiments of the present application do not specifically limit this. One end of the support rod is connected to the antenna, and the other end is fixedly connected to the holding pole to fix the antenna on the holding pole. The support rod and the antenna may be connected in a fixed manner (for example, by bolts or the like) or in a rotating manner so that the antenna can rotate around the support rod to adjust the antenna pitch angle, thereby adjusting the coverage of the antenna beam and optimizing the signal strength.

[0066] The electromagnetic shielding panel is installed on the support pole, and the patterned side of the electromagnetic shielding panel (the pattern layer of each absorber unit) needs to face the pole, and the non-patterned side (the base layer of each absorber unit) needs to face the antenna, so that the beam emitted by the antenna will not be absorbed by the absorber unit, reducing interference to the antenna. Figure 5 , which is a schematic diagram of an electromagnetic shielding panel formed by arranging the absorber units in an array. The size of the electromagnetic shielding panel can be set to 1-1.2 times the size of the antenna to minimize the impact on the antenna beam.

[0067] The electromagnetic shielding panel can be fixed by opening a mounting hole on the electromagnetic shielding panel (the mounting hole needs to be opened at a position that does not affect the wave absorbing performance of the absorber unit, such as opening it at the junction of multiple absorber units) and passing the support rod through the mounting hole. Alternatively, a clamping device can be installed on the side, top or bottom of the electromagnetic shielding panel, and the electromagnetic shielding panel can be fixedly clamped on the support rod by the clamping device, thereby reducing the impact of the mounting hole on the electromagnetic shielding panel on the wave absorbing performance of the absorber unit.

[0068] Furthermore, the electromagnetic shielding panel and the holding pole can also be fixed to improve the installation stability of the electromagnetic shielding panel. For example, a support frame can be installed on the holding pole, and the lower end of the electromagnetic shielding panel can be placed and fixed on the support frame to provide vertical stability for the electromagnetic shielding panel. Alternatively, the electromagnetic shielding panel can be installed on the holding pole by installing a support rod on the side of the electromagnetic shielding panel. As long as the method of fixing the electromagnetic shielding panel to the holding pole does not block the patterned surface of the electromagnetic shielding panel and affect the wave absorbing performance of the electromagnetic shielding panel, the embodiments of the present application do not make specific limitations on this.

[0069] The antenna bracket provided in the embodiment of the present application uses an absorber unit that can absorb high-frequency broadband electromagnetic waves to form an electromagnetic shielding panel. Therefore, during the operation of the antenna, the influence of interference electromagnetic waves within the antenna communication frequency band on the normal operation of the antenna can be reduced.

[0070] In one embodiment, Figure 6 As shown, the support frame also includes a telescopic rod, which consists of an outer rod and an inner rod. The outer rod is sleeved on the inner rod, and the inner rod can slide in the radial direction of the outer rod; the telescopic rod is installed under the support rod, and one end of the telescopic rod is connected to the antenna, and the other end is connected to the holding pole.

[0071] In the embodiment of the present application, a telescopic rod is installed below the support rod, and the support rod and the antenna are rotatably connected so that the pitch angle of the antenna is adjustable and additional support is provided for the antenna, making the antenna more stable.

[0072] The telescopic rod consists of an outer rod and an inner rod. The inner rod is installed inside the outer rod and can slide along the outer rod. One end of the telescopic rod is fixed to the antenna, and the other end is fixed to the holding pole, so that when the length of the telescopic rod changes, the telescopic rod can drive the antenna to rotate around the support pole, so that the antenna's pitch angle changes.

[0073] The telescopic rod may be an electric telescopic rod, so that the length of the telescopic rod can be adjusted and fixed after adjustment. Alternatively, a position limiting device for the position of the inner sleeve rod may be installed on the telescopic rod, for example, a plurality of pin holes may be opened on the inner sleeve rod, and a pin hole may be opened on the outer sleeve rod, and the pin holes on the outer sleeve rod and the different pin holes on the inner sleeve rod may be fixed respectively by pins, so as to achieve adjustment and fixation of the relative position of the inner sleeve rod and the outer sleeve rod.

[0074] To increase the stability of the electromagnetic shielding panel, the electromagnetic shielding panel can be fixed on the support rod and the telescopic rod at the same time. In this case, one end of the inner rod of the telescopic rod can be fixedly installed on the antenna, and one end of the outer rod can be fixedly installed on the holding rod to avoid the electromagnetic shielding panel being affected when the telescopic rod is extended or retracted.

[0075] To increase the applicable scenarios of the antenna bracket, the support rod can also be set as a telescopic rod. When the antenna needs to transmit the antenna beam toward the ground and therefore needs to adjust the direction of the antenna toward the ground, the upper telescopic rod can be adjusted to an appropriate length and then fixed, and the direction of the antenna toward the ground can be adjusted by adjusting the length of the lower telescopic rod. Similarly, when the antenna needs to transmit the antenna beam toward the sky, the lower telescopic rod can be adjusted to an appropriate length and then fixed, and then the length of the upper telescopic rod can be adjusted.

[0076] In one embodiment, the support rod is fixed to the holding rod by a first U-shaped clamping device, the telescopic rod is fixed to the holding rod by a second U-shaped clamping device, and a first mounting hole and a second mounting hole are provided on the electromagnetic shielding panel. The first U-shaped clamping device passes through the first mounting hole to fix the electromagnetic shielding panel to the support rod, and the second U-shaped clamping device passes through the second mounting hole to fix the electromagnetic shielding panel to the telescopic rod.

[0077] In the embodiment of the present application, a U-shaped clamping device may be installed at the tail of the support rod and the telescopic rod. The U-shaped clamping device has a first clamping arm and a second clamping arm that are parallel to each other, and the distance between the first clamping arm and the second clamping arm should be greater than the diameter of the holding rod, so that the holding rod can be embedded in the groove formed by the first clamping arm and the second clamping arm, and then the support rod and the telescopic rod can be fixed to the holding rod by fixing the holding rod to the U-shaped clamping device.

[0078] The electromagnetic shielding panel is provided with a first mounting hole and a second mounting hole. The mounting hole may be a strip hole, and the length of which allows the first clamping arm and the second clamping arm to simultaneously pass through the strip hole in a manner perpendicular to the electromagnetic shielding panel, so that the electromagnetic shielding panel can be fixed on the U-shaped clamping device through the strip hole. The use of the strip hole allows the electromagnetic shielding panel to adapt to U-shaped clamping devices of different sizes. When the antenna bracket needs to replace the U-shaped clamping devices of different sizes according to the different sizes of the holding poles, there is no need to re-open the electromagnetic shielding panel.

[0079] Alternatively, the mounting holes may be a pair of circular holes, and the spacing between the circular holes is the spacing between the first clamping arm and the second clamping arm. During installation, the first clamping arm passes through one circular hole, and the second clamping arm passes through another circular hole, so as to fix the electromagnetic shielding panel on the U-shaped clamping device. This method can reduce the influence of the opening on the electromagnetic shielding performance of the electromagnetic shielding panel.

[0080] In one embodiment, Figure 7 As shown, the support frame also includes a folding rod, which is composed of a first connecting rod and a second connecting rod. The second end of the first connecting rod is rotatably connected to the first end of the second connecting rod, and the first end of the first connecting rod is connected to one end of the telescopic rod, and the first end of the second connecting rod is connected to the other end of the telescopic rod.

[0081] In the embodiment of the present application, a folding rod is installed on the telescopic rod to form a triangular structure at the bottom of the antenna bracket, so that the antenna bracket is more stable. Figure 7 The middle folding rod is installed above the telescopic rod, but in fact the folding rod can also be installed below or on the side of the telescopic rod, as long as the folding rod can form a triangular structure with the telescopic rod.

[0082] The folding rod is composed of a first connecting rod (close to the antenna) and a second connecting rod (close to the holding rod) that are rotatably connected. The end of the first connecting rod and the second connecting rod close to the antenna is called the first end, and the end close to the holding rod is called the second end. The first end of the first connecting rod is rotatably connected to one end of the telescopic rod, and the second end of the second connecting rod is rotatably connected to the other end of the telescopic rod. When the angle between the first connecting rod and the second connecting rod is changed, the first connecting rod and the second connecting rod can drive the telescopic rod to shorten or lengthen, and the telescopic rod further drives the antenna to rotate around the support rod to adjust the antenna pitch angle.

[0083] When the support rod is configured as a telescopic rod, a folding rod may also be installed on the support rod, so that the antenna bracket forms a triangular structure on both the upper telescopic rod and the lower telescopic rod, further increasing the stability of the antenna bracket.

[0084] In one embodiment, Figure 8 As shown, a plurality of pin holes are provided at the second end of the first connecting rod. After the pins are inserted into the pin holes, the angle between the first connecting rod and the second connecting rod is fixed.

[0085] In an embodiment of the present application, a plurality of pin holes are provided at the connection between the first connecting rod and the second connecting rod. A plurality of corresponding pin holes may be provided on the first end of the second connecting rod. The pin holes on the second connecting rod are aligned with the pin holes on the first connecting rod, and a pin is inserted into the two aligned pin holes for fixing, so that the angle between the first connecting rod and the second connecting rod can be fixed. Alternatively, any limiting device may be installed on the first end of the second connecting rod, so that after the pin is inserted into the pin hole of the first connecting rod, the pin cooperates with the limiting device to limit the rotation of the second connecting rod, thereby achieving the effect of fixing the angle between the first connecting rod and the second connecting rod.

[0086] In one embodiment, Fig. 9 As shown, a fixing bolt hole is provided on the inner sleeve rod, and a fixing bolt slot is provided on the outer sleeve rod. After the fixing bolt is inserted into the fixing bolt hole through the fixing bolt slot, the relative position between the inner sleeve rod and the outer sleeve rod is fixed.

[0087] In the embodiment of the present application, the relative position between the inner sleeve rod and the outer sleeve rod can be fixed by a fixing bolt, so that the telescopic rod can be subjected to force after being fixed, thereby improving the stability of the antenna bracket.

[0088] One or more fixing bolt holes can be set on the inner sleeve rod, and a fixing bolt slot can be set on the outer sleeve rod. The positions of the fixing bolt holes on the inner sleeve rod when the angle between the first connecting rod and the second connecting rod is fixed through different pin holes can be recorded, and the length of the fixing bolt slot can be designed according to the position of the fixing bolt holes, so that when the first connecting rod and the second connecting rod are fixed through any pin hole, at least one fixing bolt hole is located in the fixing bolt slot, which is convenient for inserting the fixing bolt into the fixing bolt hole to fix the relative position of the inner sleeve rod and the outer sleeve rod.

[0089] In application, when the pitch angle of the antenna needs to be adjusted, the fixing bolt on the telescopic rod can be first loosened, and the pin in the pin hole of the folding rod can be loosened to adjust the angle between the first connecting rod and the second connecting rod. The change in the angle between the first connecting rod and the second connecting rod drives the telescopic rod to extend or shorten. After the angle between the first connecting rod and the second connecting rod is adjusted to a suitable angle, the pin is reinserted into the pin hole to fix it, and the fixing bolt on the telescopic rod is tightened to complete the adjustment of the antenna pitch angle.

[0090] In one embodiment, the pin hole is marked with an antenna pitch angle scale, which is determined based on the length of the antenna, the length of the first connecting rod, the length of the second connecting rod, and the angle between the first connecting rod and the second connecting rod after the pin is inserted into the pin hole.

[0091] In the embodiment of the present application, the antenna pitch angle scale can be marked on the pin hole. The antenna pitch angle scale marked on each pin hole is the angle formed by the antenna relative to the direction perpendicular to the ground after the angle between the first connecting rod and the second connecting rod is fixed by the pin hole. Marking the antenna pitch angle scale on the pin hole can facilitate the technician to determine the pin hole to be used based on the scale and the angle to which the antenna needs to be adjusted.

[0092] The pitch angle scale can be specifically calculated by the length of the antenna, the length of the first connecting rod, the length of the second connecting rod, and the angle between the first connecting rod and the second connecting rod after the pin is inserted into the pin hole. The specific calculation method can be found in formula (V):

[0093] Formula (V)

[0094] in, is the elevation angle of the antenna, is the length of the first connecting rod, is the length of the second connecting rod, is the angle between the first connecting rod and the second connecting rod, is the antenna length. Considering that different antenna lengths will result in different elevation angle scales corresponding to the same pin hole, several commonly used antenna lengths can be determined in advance, and for each different antenna length, the elevation angle scale corresponding to the pin hole is calculated respectively, and the elevation angle scale corresponding to each different antenna length is marked on the pin hole.

[0095] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An absorber unit, characterized in that: The absorber unit is composed of a pattern layer, a substrate layer and a base layer stacked in sequence from top to bottom, wherein the pattern layer, the substrate layer and the base layer are made of non-metallic materials, wherein: The pattern layer is composed of a plurality of nested open circular rings, and the opening directions of two adjacent open circular rings are different.

2. The absorber unit according to claim 1, characterized in that The pattern layer and the base layer are made of ITO indium tin oxide material, and the substrate layer is made of PET polyethylene terephthalate material.

3. The absorber unit according to claim 1, characterized in that The open circular ring includes a first open circular ring, a second open circular ring and a third open circular ring, wherein the center radius of the first open circular ring is determined according to the boundary frequency of the target absorption frequency band of the absorber, the center radius of the second open circular ring is determined according to the absorption center frequency of the first open circular ring, and the center radius of the third open circular ring is determined according to the absorption center frequency of the second open circular ring.

4. An antenna bracket, characterized in that: It comprises a support frame and an electromagnetic shielding panel, wherein the electromagnetic shielding panel is composed of a plurality of absorber units arranged in an array, and the absorber unit is the absorber unit according to any one of claims 1 to 3, wherein: The support frame includes a support rod, one end of which is connected to the antenna, and the other end of which is connected to the holding pole; The electromagnetic shielding panel is installed on the supporting pole and is located between the antenna and the holding pole, and the pattern layer of each absorber unit on the electromagnetic shielding panel faces the holding pole.

5. The antenna bracket according to claim 4, characterized in that: The support frame further comprises a telescopic rod, which is composed of an outer sleeve rod and an inner sleeve rod, wherein the outer sleeve rod is sleeved on the inner sleeve rod, and the inner sleeve rod can slide along the radial direction of the outer sleeve rod; The telescopic rod is installed below the supporting rod, and one end of the telescopic rod is connected to the antenna, and the other end of the telescopic rod is connected to the holding rod.

6. The antenna bracket according to claim 5, characterized in that: The support rod is fixed to the holding rod by a first U-shaped clamping device, and the telescopic rod is fixed to the holding rod by a second U-shaped clamping device. The electromagnetic shielding panel is provided with a first mounting hole and a second mounting hole. The first U-shaped clamping device passes through the first mounting hole to fix the electromagnetic shielding panel to the support rod, and the second U-shaped clamping device passes through the second mounting hole to fix the electromagnetic shielding panel to the telescopic rod.

7. The antenna bracket according to claim 5, characterized in that: The support frame also includes a folding rod, which is composed of a first connecting rod and a second connecting rod. The second end of the first connecting rod is rotatably connected to the first end of the second connecting rod, and the first end of the first connecting rod is connected to one end of the telescopic rod, and the first end of the second connecting rod is connected to the other end of the telescopic rod.

8. The antenna bracket according to claim 7, characterized in that: The second end of the first connecting rod is provided with a plurality of pin holes. After pins are inserted into the pin holes, the angle between the first connecting rod and the second connecting rod is fixed.

9. The antenna bracket according to claim 8, characterized in that: The inner sleeve rod is provided with a fixing bolt hole, and the outer sleeve rod is provided with a fixing bolt slot. After the fixing bolt is inserted into the fixing bolt hole through the fixing bolt slot, the relative position between the inner sleeve rod and the outer sleeve rod is fixed.

10. The antenna bracket according to claim 9, characterized in that: The pin hole is marked with an antenna pitch angle scale, which is determined based on the length of the antenna, the length of the first connecting rod, the length of the second connecting rod, and the angle between the first connecting rod and the second connecting rod after a pin is inserted into the pin hole.

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