CN109449606B - Double-frequency broadband wave-absorbing patch and preparation method thereof - Google Patents
Double-frequency broadband wave-absorbing patch and preparation method thereof Download PDFInfo
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- CN109449606B CN109449606B CN201811484202.2A CN201811484202A CN109449606B CN 109449606 B CN109449606 B CN 109449606B CN 201811484202 A CN201811484202 A CN 201811484202A CN 109449606 B CN109449606 B CN 109449606B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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Abstract
The invention provides a double-frequency broadband wave-absorbing patch and a preparation method thereof, belonging to the technical field of electromagnetic wave-absorbing materials. The wave-absorbing patch comprises a wave-transmitting layer patch, a high-loss layer patch and a frequency selection layer. The high-loss layer patch is arranged on the surface of one side of the frequency selection layer, and the wave-transparent layer patch is arranged on the surface of one side, far away from the frequency selection layer, of the high-loss layer patch. The frequency selection layer is conductive cloth with unit patterns which are periodically arranged. The double-frequency broadband wave-absorbing patch is simple in structure, thin in thickness, small in surface density, good in shape following performance, and convenient to construct and maintain, and has double-frequency broadband wave-absorbing performance. The preparation method comprises the following steps: preparing a wave-transparent layer patch, preparing a high-loss layer patch and preparing a frequency selection layer; and the high-loss layer patch is pasted on the surface of one side of the frequency selection layer, and the wave-transmitting layer patch is pasted on the surface of one side, far away from the frequency selection layer, of the high-loss layer patch. The preparation method is simple, quick, easy to operate and control.
Description
Technical Field
The invention belongs to the technical field of electromagnetic wave absorbing materials, and particularly relates to a dual-frequency broadband wave absorbing patch and a preparation method thereof.
Background
With the increasingly widespread and complicated use of electronic devices and weaponry, the electromagnetic wave pollution and interference increase correspondingly, so the performance requirements of the wave absorbing material are higher and higher. The double-frequency absorption material not only expands the absorption bandwidth, but also has flexibly adjustable absorption peak position, and can meet the requirement on the appointed absorption frequency band.
The design scheme of the existing commonly used dual-frequency flexible wave-absorbing material has the following defects: some wave-absorbing materials are often thick, and the design flexibility of an absorption frequency band is poor; some wave-absorbing effective bandwidth is too narrow (often less than 0.5GHz), and the engineering applicability is small.
Disclosure of Invention
One of the purposes of the invention comprises providing a double-frequency broadband wave-absorbing patch which has the advantages of simple structure, thin thickness, small surface density, good shape following property, double-frequency broadband wave-absorbing performance and convenient construction and maintenance.
The second purpose of the invention is to provide a preparation method of the double-frequency broadband wave-absorbing patch, which is simple and rapid, easy to operate and control.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the embodiment of the invention provides a double-frequency broadband wave-absorbing patch which comprises a wave-transmitting layer patch, a high-loss layer patch and a frequency selection layer.
The high-loss layer patch is arranged on the surface of one side of the frequency selection layer, and the wave-transparent layer patch is arranged on the surface of one side, far away from the frequency selection layer, of the high-loss layer patch.
The frequency selection layer is conductive cloth with unit patterns which are periodically arranged.
The invention also provides a preparation method of the double-frequency broadband wave-absorbing patch, which comprises the following steps:
mixing the raw materials of the wave-transmitting layer, dispersing and vulcanizing to form the wave-transmitting layer patch.
Mixing the raw materials of the high-loss layer, dispersing and vulcanizing to form the high-loss layer patch.
And cutting according to the designed unit pattern to obtain the frequency selection layer.
And the high-loss layer patch is pasted on the surface of one side of the frequency selection layer, and the wave-transmitting layer patch is pasted on the surface of one side, far away from the frequency selection layer, of the high-loss layer patch.
The double-frequency broadband wave-absorbing patch and the preparation method thereof in the embodiment of the invention have the beneficial effects that:
the double-frequency broadband wave-absorbing patch provided by the preferred embodiment of the invention has the advantages of simple structure, thin thickness, small surface density, good shape following property, double-frequency broadband wave-absorbing performance and convenience in construction and maintenance. The preparation method is simple, quick, easy to operate and easy to control.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural view of a dual-frequency broadband wave-absorbing patch provided by the present application;
fig. 2 is a flat plate reflectivity test curve diagram of the dual-frequency broadband wave-absorbing patch provided in embodiment 1 of the present application;
fig. 3 is a flat plate reflectivity test curve diagram of the dual-frequency broadband wave-absorbing patch provided in embodiment 2 of the present application;
fig. 4 is a flat plate reflectivity test curve diagram of the dual-frequency broadband wave-absorbing patch provided in embodiment 3 of the present application.
Icon: 10-double-frequency broadband wave-absorbing patch; 11-wave-transparent layer patch; 12-high loss layer patch; 13-frequency selective layer; 14-glass fibre reinforced plastic protective layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "vertical" or the like does not require that the components be perfectly vertical, but rather may be slightly inclined. For example, "vertical" merely means that the direction is more vertical than "horizontal", and does not mean that the structure must be perfectly vertical, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following is a detailed description.
Referring to fig. 1, a dual-frequency broadband wave-absorbing patch 10 according to the present invention includes a wave-transparent layer patch 11, a high-loss layer patch 12, and a frequency-selective layer 13.
The high-loss layer patch 12 is arranged on the surface of one side of the frequency selection layer 13, and the wave-transparent layer patch 11 is arranged on the surface of one side of the high-loss layer patch 12 far away from the frequency selection layer 13.
The inventor finds that the electric loss type absorbent is used as a surface layer absorbent to form the adjustment of the absorption of high-frequency-band microwaves and the surface impedance matching; the magnetic loss type absorbent filling layer is used as a high loss layer to form effective absorption of low-frequency-band microwaves; the conductive cloth with patterns is used as a periodic structure layer to regulate the distribution of an electromagnetic field and realize the regulation of the absorption double peaks. By combining the three-layer structure, the broadening of the dual-band absorption peak is facilitated.
In some embodiments, the material of wave-transparent layer patch 11 contains 0.5-15 wt%, such as 0.5 wt%, 1 wt%, 2 wt%, 5 wt%, 8 wt%, 10 wt%, 12 wt%, or 15 wt% of electrically lossy absorber.
Alternatively, the electrically lossy absorber may include, for example, at least one of carbon black, carbon fiber, and carbon nanotubes. The carbon black has strong absorption in a high frequency band (Ku waveband), has the outstanding properties of strong adsorbability, good chemical stability and low density, and can be used as one of raw materials of the wave-transparent layer patch 11 to produce the low-areal-density wave-absorbing material. Thus, patches containing carbon black are also often placed on the facing to adjust impedance matching.
In some embodiments, the raw material of high-loss layer patch 12 contains 60-90 wt%, such as 60 wt%, 65 wt%, 70 wt%, 75 wt%, 80 wt%, 85 wt%, or 90 wt% of the magnetic loss type absorber.
Alternatively, the magnetic loss type absorbent includes at least one of ferrite, alloy powder, and carbonyl iron powder. The alloy powder is metal powder formed by partially or completely alloying two or more components, and can be selected from iron alloy powder, copper alloy powder, nickel alloy powder, cobalt alloy powder, aluminum alloy powder, titanium alloy powder, precious metal alloy powder and the like.
In some preferred embodiments, the magnetic loss type absorbent comprises carbonyl iron powder, and more preferably, the carbonyl iron powder is flaky carbonyl iron powder after flaking. The sheet carbonyl iron powder is used as the raw material of the magnetic loss type absorbent, so that the magnetic conductivity and the magnetic loss can be obviously improved, and the patch containing the carbonyl iron powder can realize the absorption of low frequency with ideal bandwidth at a lower layer thickness.
In this application, all still contain the rubber substrate in the raw materials of wave-transparent layer paster 11 and the raw materials of high-loss layer, the rubber substrate includes at least one in silicon rubber, natural rubber and chlorinated polyethylene rubber. The rubber is used as a substrate, a large amount of absorbing agents (including an electric loss type absorbing agent and a magnetic loss type absorbing agent) can be loaded, microwave energy can be effectively dissipated, and the rubber is easy to arrange and serve as a wave absorbing layer in a device with a complex structure or a cavity due to the characteristics of softness, easiness in cutting, good adhesion and the like.
In the present application, the raw materials of the wave-transmitting layer patch 11 and the high-loss layer patch 12 each further contain a compounding agent and a processing aid.
The compounding agent may include zinc oxide, stearic acid, antioxidant (RD), and antifungal agent. Processing aids may include sulfur, benzotriazol-1-yloxytris (BOP), dicumyl peroxide (DCP), and the like.
In reference, the raw material of the wave-transmitting layer patch 11 may contain 0.1-2 wt% of zinc oxide, 0.1-2 wt% of stearic acid, 0.1-2 wt% of an antioxidant, 0.1-2 wt% of a mildewproof agent, 0.1-4 wt% of sulfur, 0.1-4 wt% of BOP, and 0.1-4 wt% of DCP. It should be noted that the total of the weight percentages of the electrically lossy absorber, the compounding agent, the processing aid, and the rubber matrix in the raw material of the wave-transmitting layer patch 11 is 100%.
Correspondingly, the content of the compounding agent and the processing aid in the high-loss layer patch 12 can be set as required, and the total of the weight percentages of the magnetic loss type absorbent, the compounding agent, the processing aid and the rubber matrix in the high-loss layer patch 12 is 100%.
The frequency selective layer 13 is a conductive cloth with unit patterns arranged periodically. The conductive cloth is a high-conductivity ultrathin layer material, and the conductive cloth serving as a frequency selection layer 13 material can effectively regulate and control electromagnetic field distribution, has proper stiffness and easy cutting performance, and provides a larger design space for carving patterns with certain precision. The periodic arrangement means that the unit patterns are repeatedly arranged according to a certain rule.
Alternatively, the unit pattern of the frequency selective layer 13 may include, for example, at least one of an S-type pattern, a loop type pattern, an open resonant loop pattern, and a complementary structure of an open resonant loop. It should be noted that the ring-shaped pattern includes, but is not limited to, a square-shaped pattern.
In some preferred embodiments, the surface resistance of the conductive cloth is not greater than 0.05 s/m.
In the present application, the thickness of the wave-transmitting layer patch 11 may be 0.5 to 2.8mm, such as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 2.8mm, and may be any thickness value within a range of 0.5 to 2.8 mm.
The thickness of the high-loss layer patch 12 may be 0.2 to 0.8mm, such as 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm, or any thickness value within the range of 0.2 to 0.8 mm.
The thickness of the optional layer 13 may be 0.02-0.1mm, such as 0.02mm, 0.04mm, 0.05mm, 0.06mm, 0.08mm, or 0.1mm, or any thickness value within the range of 0.02-0.1 mm.
In some preferred embodiments, the thickness of the whole dual-frequency broadband wave-absorbing patch 10 is not more than 3mm, that is, the thickness of the wave-transparent layer patch 11, the high-loss layer patch 12 and the frequency-selective layer 13 are freely combined within the range of the thicknesses, and the thickness of the combined dual-frequency broadband wave-absorbing patch 10 is not more than 3 mm.
Further, the dual-frequency broadband wave-absorbing patch 10 further comprises a glass fiber reinforced plastic protective layer 14, and one side of the frequency-selective layer 13, which is far away from the high-loss layer patch 12, is used for being adhered to the surface of the glass fiber reinforced plastic protective layer 14. The thickness of the glass fiber reinforced plastic protective layer 14 may be 0.5mm to 2mm, such as 0.5mm, 0.8mm, 1mm, 1.5mm, or 2mm, and may be any thickness value within the range of 0.5mm to 2 mm.
When the dual-frequency broadband wave-absorbing patch 10 further comprises a glass fiber reinforced plastic protective layer 14, it is correspondingly preferable that the thickness ranges of the wave-transparent layer patch 11, the high-loss layer patch 12, the frequency-selective layer 13 and the glass fiber reinforced plastic protective layer 14 are freely combined, and the sum of the thicknesses of the wave-transparent layer patch 11, the high-loss layer patch 12 and the frequency-selective layer 13 is not more than 3 mm.
In addition, the application also provides a preparation method of the dual-frequency broadband wave-absorbing patch 10, which for example comprises the following steps:
preparing a wave-transmitting layer patch 11: mixing the raw materials of the wave-transmitting layer, dispersing and vulcanizing to form the wave-transmitting layer patch 11.
Preparation of high-loss layer patch 12: mixing the raw materials of the high-loss layer, dispersing and vulcanizing to form the high-loss layer patch 12.
Preparing the frequency selective layer 13: cut in the designed unit pattern to obtain the frequency selective layer 13.
The high-loss layer patch 12 is attached to the surface of the frequency selective layer 13 on the side, and the wave-transmitting layer patch 11 is attached to the surface of the high-loss layer patch 12 on the side away from the frequency selective layer 13.
When the dual-frequency broadband wave-absorbing patch 10 further comprises the glass fiber reinforced plastic protective layer 14, combining the above steps, the side of the frequency-selective layer 13 far away from the high-loss layer patch 12 is adhered to the surface of the glass fiber reinforced plastic protective layer 14.
Specifically, the wave-transparent layer patch 11 is prepared by referring to: adding compounding agents such as zinc oxide, stearic acid, an anti-aging agent, a mildew preventive and the like, processing aids such as sulfur, BOP (blow-off Process), DCP (DCP), and an electrical loss type absorbent into a rubber substrate, dispersing and uniformly forming a rubber material by adopting an open rubber mixing mill and a calender, and vulcanizing to a thickness corresponding to a required wave-absorbing frequency band by using a vulcanizing machine to obtain the wave-transmitting layer patch 11. The electrically lossy absorber may also include a pretreatment process, such as chemical solvent dispersion, drying, air flow dispersion, etc., prior to mixing with the rubber matrix, which may be performed in a conventional manner according to the prior art.
The preparation of the high loss layer patch 12 can be referred to as: adding compounding agents such as zinc oxide, stearic acid, an anti-aging agent, a mildew preventive and the like, processing aids such as sulfur, BOP (blow-off propylene), DCP (DCP), and a magnetic loss type absorbent into a rubber substrate, dispersing and uniformly molding a rubber material by using an open rubber mixing mill and a calender, and vulcanizing to a thickness corresponding to a required wave-absorbing frequency band by using a vulcanizing machine to obtain the high-loss layer patch 12. Wherein the magnetic loss type absorbent may further comprise a pretreatment process such as chemical solvent coating and dispersion, attritor, drying, air flow dispersion, etc., prior to mixing with the rubber matrix, which may also be performed in a conventional manner with reference to the prior art.
The frequency selective layer 13 can be prepared by referring to: and cutting the designed pattern by laser, wherein the size error is less than 0.1 mm.
In summary, the preparation method of the double-frequency broadband wave-absorbing patch 10 is simple and quick, easy to operate and control, and the double-frequency broadband wave-absorbing patch 10 with thin thickness, small surface density, good shape following performance and double-frequency broadband wave-absorbing performance can be prepared by the preparation method.
Example 1
The embodiment provides a dual-frequency broadband wave-absorbing patch 10, and the dual-frequency broadband wave-absorbing patch 10 includes a wave-transparent layer patch 11 with a thickness of 2.5mm, a high-loss layer patch 12 with a thickness of 0.4mm, a frequency-selective layer 13 with a thickness of 0.05mm, and a glass fiber reinforced plastic protective layer 14 with a thickness of 1 mm. The frequency selection layer 13 and the high-loss layer patch 12 are adhered to the surface of one side of the frequency selection layer 13, the wave-transparent layer patch 11 is adhered to the surface of one side of the high-loss layer patch 12 far away from the frequency selection layer 13, and the side of the frequency selection layer 13 far away from the high-loss layer patch 12 is adhered to the surface of the glass fiber reinforced plastic protective layer 14.
The raw materials of the wave-transmitting layer patch 11 comprise 6 wt% of carbon black, 1 wt% of zinc oxide, 1 wt% of stearic acid, 1 wt% of an anti-aging agent, 1 wt% of a mildew preventive, 2 wt% of sulfur, 2 wt% of BOP (blow-off valve) and 2 wt% of DCP (DCP), and the balance of natural rubber.
The raw materials of the high-loss layer patch 12 comprise 85 wt% of flaky carbonyl iron powder, 0.5 wt% of zinc oxide, 0.5 wt% of stearic acid, 0.5 wt% of an anti-aging agent, 0.5 wt% of a mildew preventive, 1 wt% of sulfur, 1 wt% of BOP and 1 wt% of DCP, and the balance of natural rubber.
The frequency selection layer 13 is conductive cloth with unit patterns which are periodically arranged, the unit patterns are square blocks, the side length of each square block is 1.4mm, the size of each structural unit of the conductive cloth is 2.0mm, and the surface resistance of the conductive cloth is 0.05 s/m.
The preparation method of the double-frequency broadband wave-absorbing patch 10 comprises the following steps: adding zinc oxide, stearic acid, an anti-aging agent, a mildew preventive, sulfur, BOP, DCP and carbon black into natural rubber according to a ratio, dispersing and uniformly forming the rubber material by adopting an open rubber mixing mill and a calender, and vulcanizing to 2.5mm by using a vulcanizing machine to obtain the wave-transmitting layer patch 11. Wherein, the electric loss type absorbent is also pretreated before being mixed with the rubber matrix: including chemical solvent dispersion, drying, and air flow dispersion, among others.
Adding zinc oxide, stearic acid, an anti-aging agent, a mildew preventive, sulfur, BOP, DCP and flaky carbonyl iron powder into natural rubber according to a ratio, dispersing and uniformly molding the rubber material by adopting an open rubber mixing mill and a calender, and vulcanizing to 0.4mm by using a vulcanizing machine to obtain the high-loss layer patch 12. Wherein, the magnetic loss type absorbent is also pretreated before being mixed with the rubber matrix: including chemical solvent coating and dispersion, stirring, drying, air flow dispersion, etc.
The designed pattern is cut by a laser to obtain the frequency selective layer 13.
Cutting each prepared layer of patch into the size of 180mm multiplied by 180mm, pasting the high-loss layer patch 12 on the surface of one side of the frequency selection layer 13, pasting the wave-transparent layer patch 11 on the surface of one side of the high-loss layer patch 12 far away from the frequency selection layer 13, pasting one side of the frequency selection layer 13 far away from the high-loss layer patch 12 on the surface of the glass fiber reinforced plastic protective layer 14, and curing into a whole to obtain the double-frequency broadband wave-absorbing patch 10.
The performance of the double-frequency broadband wave-absorbing patch 10 is detected according to a detection method commonly used in the field, the result is shown in figure 2, and as can be seen from figure 2, the reflectivity of the double-frequency broadband wave-absorbing patch 10 at 14.1-17.5GHz is less than or equal to-10 dB, the peak value is 15.5GHz, and the intensity is-14.86 dB; the absorption peak at the lower frequency was at 4.1GHz with an intensity of-9.34 dB.
Example 2
The dual-frequency broadband wave-absorbing patch 10 provided by the embodiment comprises a wave-transparent layer patch 11 with the thickness of 2.5mm, a high-loss layer patch 12 with the thickness of 0.4mm, a frequency-selective layer 13 with the thickness of 0.05mm, and a glass fiber reinforced plastic protective layer 14 with the thickness of 0.5 mm. The frequency selection layer 13 and the high-loss layer patch 12 are adhered to the surface of one side of the frequency selection layer 13, the wave-transparent layer patch 11 is adhered to the surface of one side of the high-loss layer patch 12 far away from the frequency selection layer 13, and the side of the frequency selection layer 13 far away from the high-loss layer patch 12 is adhered to the surface of the glass fiber reinforced plastic protective layer 14.
The raw materials of the wave-transmitting layer patch 11 comprise 6 wt% of carbon black, 1 wt% of zinc oxide, 1 wt% of stearic acid, 1 wt% of an anti-aging agent, 1 wt% of a mildew preventive, 2 wt% of sulfur, 2 wt% of BOP (blow-off valve) and 2 wt% of DCP (DCP), and the balance of natural rubber.
The raw materials of the high-loss layer patch 12 comprise 80 wt% of flaky carbonyl iron powder, 0.5 wt% of zinc oxide, 0.5 wt% of stearic acid, 0.5 wt% of an anti-aging agent, 0.5 wt% of a mildew preventive, 1 wt% of sulfur, 1 wt% of BOP and 1 wt% of DCP, and the balance of natural rubber.
The frequency selection layer 13 is conductive cloth with unit patterns which are periodically arranged, the unit patterns are square blocks, the side length of each square block is 4.5mm, the size of each structural unit of the conductive cloth is 6.5mm, and the surface resistance of the conductive cloth is 0.01 s/m.
The preparation process of each layer of the double-frequency broadband wave-absorbing patch 10 refers to example 1. Cutting each prepared layer of patch into the size of 180mm multiplied by 180mm, pasting the high-loss layer patch 12 on the surface of one side of the frequency selection layer 13, pasting the wave-transparent layer patch 11 on the surface of one side of the high-loss layer patch 12 far away from the frequency selection layer 13, pasting one side of the frequency selection layer 13 far away from the high-loss layer patch 12 on the surface of the glass fiber reinforced plastic protective layer 14, and curing into a whole to obtain the double-frequency broadband wave-absorbing patch 10.
The performance of the double-frequency broadband wave-absorbing patch 10 is detected according to a detection method commonly used in the field, the result is shown in figure 3, and as can be seen from figure 3, the reflectivity of the double-frequency broadband wave-absorbing patch 10 at 3-4.1GHz is less than or equal to-10 dB, the peak values are respectively at 3.5GHz and 15.4GHz, and the corresponding intensities are-23.1 dB and-17.7 dB.
Example 3
The dual-frequency broadband wave-absorbing patch 10 provided by the embodiment comprises a wave-transparent layer patch 11 with the thickness of 2.3mm, a high-loss layer patch 12 with the thickness of 0.4mm, a frequency-selective layer 13 with the thickness of 0.05mm, and a glass fiber reinforced plastic protective layer 14 with the thickness of 2 mm. The frequency selection layer 13 and the high-loss layer patch 12 are adhered to the surface of one side of the frequency selection layer 13, the wave-transparent layer patch 11 is adhered to the surface of one side of the high-loss layer patch 12 far away from the frequency selection layer 13, and the side of the frequency selection layer 13 far away from the high-loss layer patch 12 is adhered to the surface of the glass fiber reinforced plastic protective layer 14.
The raw materials of the wave-transmitting layer patch 11 comprise 8 wt% of carbon black, 1 wt% of zinc oxide, 1 wt% of stearic acid, 1 wt% of an anti-aging agent, 1 wt% of a mildew preventive, 2 wt% of sulfur, 2 wt% of BOP (blow-off valve) and 2 wt% of DCP (DCP), and the balance of natural rubber.
The raw materials of the high-loss layer patch 12 comprise 80 wt% of flaky carbonyl iron powder, 0.5 wt% of zinc oxide, 0.5 wt% of stearic acid, 0.5 wt% of an anti-aging agent, 0.5 wt% of a mildew preventive, 1 wt% of sulfur, 1 wt% of BOP and 1 wt% of DCP, and the balance of natural rubber.
The frequency selection layer 13 is conductive cloth with unit patterns which are periodically arranged, the unit patterns are square blocks, the side length of each square block is 4.5mm, the size of each structural unit of the conductive cloth is 6.5mm, and the surface resistance of the conductive cloth is 0.03 s/m.
The preparation process of each layer of the double-frequency broadband wave-absorbing patch 10 refers to example 1. Cutting each prepared layer of patch into the size of 180mm multiplied by 180mm, pasting the high-loss layer patch 12 on the surface of one side of the frequency selection layer 13, pasting the wave-transparent layer patch 11 on the surface of one side of the high-loss layer patch 12 far away from the frequency selection layer 13, pasting one side of the frequency selection layer 13 far away from the high-loss layer patch 12 on the surface of the glass fiber reinforced plastic protective layer 14, and curing into a whole to obtain the double-frequency broadband wave-absorbing patch 10.
The performance of the double-frequency broadband wave-absorbing patch 10 is detected according to a detection method commonly used in the field, the result is shown in figure 4, and as can be seen from figure 4, the reflectivity of the double-frequency broadband wave-absorbing patch 10 at 3.1-4.2GHz and 13.9-18.0GHz is less than or equal to-10 dB, the peak values are respectively at 3.6GHz and 16.4GHz, and the corresponding strength is-21.28 dB and-19.08 dB.
Example 4
The dual-frequency broadband wave-absorbing patch 10 provided by the embodiment comprises a wave-transparent layer patch 11 with the thickness of 0.5mm, a high-loss layer patch 12 with the thickness of 0.2mm and a frequency-selective layer 13 with the thickness of 0.02 mm. The high-loss layer patch 12 is arranged on the surface of one side of the frequency selection layer 13, and the wave-transparent layer patch 11 is arranged on the surface of one side of the high-loss layer patch 12 far away from the frequency selection layer 13.
The raw materials of the wave-transmitting layer patch 11 comprise 0.5 wt% of carbon fiber, 0.1 wt% of zinc oxide, 0.1 wt% of stearic acid, 0.1 wt% of anti-aging agent, 0.1 wt% of mildew preventive, 0.1 wt% of sulfur, 0.1 wt% of BOP, 0.1 wt% of DCP and the balance of silicon rubber.
The raw materials of the high-loss layer patch 12 comprise 90 wt% of ferrite, 0.5 wt% of zinc oxide, 0.5 wt% of stearic acid, 0.5 wt% of anti-aging agent, 0.5 wt% of mildew preventive, 1 wt% of sulfur, 1 wt% of BOP and 1 wt% of DCP, and the balance of natural rubber.
The frequency selection layer 13 is a conductive cloth with unit patterns which are periodically arranged, the unit patterns are S-shaped patterns, the size of the structural units of the conductive cloth is 6.5mm, and the surface resistance of the conductive cloth is 0.04S/m.
The obtained double-frequency broadband wave-absorbing patch 10 also has double-frequency broadband wave-absorbing performance.
Example 5
The dual-frequency broadband wave-absorbing patch 10 provided by the embodiment comprises a wave-transparent layer patch 11 with the thickness of 2.8mm, a high-loss layer patch 12 with the thickness of 0.8mm and a frequency-selective layer 13 with the thickness of 0.1 mm. The high-loss layer patch 12 is arranged on the surface of one side of the frequency selection layer 13, and the wave-transparent layer patch 11 is arranged on the surface of one side of the high-loss layer patch 12 far away from the frequency selection layer 13.
The raw materials of the wave-transmitting layer patch 11 comprise 5 wt% of carbon nanotubes, 10 wt% of carbon black, 2 wt% of zinc oxide, 2 wt% of stearic acid, 2 wt% of an anti-aging agent, 2 wt% of a mildew preventive, 4 wt% of sulfur, 4 wt% of BOP and 4 wt% of DCP, and the balance of natural rubber.
The raw materials of the high-loss layer patch 12 comprise 30 wt% of ferroalloy powder, 30 wt% of flaky carbonyl iron powder, 2 wt% of zinc oxide, 2 wt% of stearic acid, 2 wt% of an anti-aging agent, 2 wt% of a mildew preventive, 4 wt% of sulfur, 4 wt% of BOP and 4 wt% of DCP, and the balance of chlorinated polyethylene rubber and silicon rubber in a weight ratio of 1: 1 the mixed rubber obtained by mixing.
The frequency selection layer 13 is conductive cloth with unit patterns which are periodically arranged, the unit patterns are open resonant ring patterns, the size of structural units of the conductive cloth is 6.5mm, and the surface resistance of the conductive cloth is 0.02 s/m.
The obtained double-frequency broadband wave-absorbing patch 10 also has double-frequency broadband wave-absorbing performance.
In conclusion, the double-frequency broadband wave-absorbing patch 10 provided by the application has the advantages of simple structure, thin thickness, small surface density, good shape following property, double-frequency broadband wave-absorbing performance and convenience in construction and maintenance. The preparation method is simple, quick, easy to operate and easy to control.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A double-frequency broadband wave-absorbing patch is characterized by comprising a wave-transparent layer patch, a high-loss layer patch and a frequency selection layer;
the high-loss layer patch is arranged on the surface of one side of the frequency selection layer, and the wave-transparent layer patch is arranged on the surface of one side of the high-loss layer patch, which is far away from the frequency selection layer;
the frequency selection layer is conductive cloth with unit patterns which are periodically arranged;
the raw material of the wave-transparent layer patch contains 0.5-15 wt% of an electrical loss type absorbent, and the electrical loss type absorbent comprises carbon black;
the raw material of the high-loss layer patch contains 60-90 wt% of magnetic loss type absorbent; the magnetic loss type absorbent comprises flaky carbonyl iron powder.
2. The dual-frequency broadband wave-absorbing patch according to claim 1, wherein the raw materials of the wave-transparent layer patch and the high-loss layer patch each further comprise a rubber matrix, and the rubber matrix comprises at least one of silicone rubber, natural rubber and chlorinated polyethylene rubber.
3. The dual-frequency broadband wave-absorbing patch according to claim 2, wherein the raw materials of the wave-transparent layer patch and the high-loss layer patch both further contain a compounding agent and a processing aid;
the compounding agent comprises zinc oxide, stearic acid, an anti-aging agent and a mildew preventive;
the processing aid comprises sulfur, benzotriazole-1-oxyl tris and dicumyl peroxide.
4. The patch of claim 1, wherein the unit pattern comprises at least one of an S-shaped pattern, a ring pattern, an open resonant ring pattern, and a complementary configuration of the open resonant ring.
5. The dual-frequency broadband wave-absorbing patch according to claim 1, wherein the surface resistance of the conductive cloth is not more than 0.05 m/s.
6. The dual-frequency broadband wave-absorbing patch according to claim 1, wherein the thickness of the wave-transparent layer patch is 0.5-2.8mm, and/or the thickness of the high-loss layer patch is 0.2-0.8mm, and/or the thickness of the frequency-selective layer patch is 0.02-0.1 mm.
7. The dual-frequency broadband wave-absorbing patch according to claim 6, wherein the thickness of the dual-frequency broadband wave-absorbing patch is no more than 3 mm.
8. The dual-frequency broadband wave-absorbing patch according to claim 1, further comprising a glass fiber reinforced plastic protective layer, wherein one side of the frequency selective layer, which is far away from the high-loss layer patch, is used for being adhered to the surface of the glass fiber reinforced plastic protective layer.
9. A method for preparing a dual-frequency broadband wave-absorbing patch according to any one of claims 1-8, comprising the following steps:
mixing the raw materials of the wave-transmitting layer, dispersing and vulcanizing to form a wave-transmitting layer patch;
mixing the raw materials of the high-loss layer, dispersing and vulcanizing to form a high-loss layer patch;
cutting according to the designed unit pattern to obtain a frequency selection layer;
and the high-loss layer patch is pasted on the surface of one side of the frequency selection layer, and the wave-transparent layer patch is pasted on the surface of one side, far away from the frequency selection layer, of the high-loss layer patch.
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| CN105655721A (en) * | 2015-08-03 | 2016-06-08 | 西安电子科技大学 | Double-waveband composite broadband wave absorbing material based on frequency selective surface |
| CN107946761A (en) * | 2017-11-03 | 2018-04-20 | 吉林化工学院 | A kind of iron-based wave-absorber based on bandpass-type frequency-selective surfaces |
| CN108148289A (en) * | 2016-12-05 | 2018-06-12 | 洛阳尖端技术研究院 | A kind of Meta Materials base material and preparation method thereof |
| CN108617160A (en) * | 2018-06-22 | 2018-10-02 | 四川大学 | A kind of absorbing material and preparation method thereof |
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| US6917343B2 (en) * | 2001-09-19 | 2005-07-12 | Titan Aerospace Electronics Division | Broadband antennas over electronically reconfigurable artificial magnetic conductor surfaces |
| US8587469B2 (en) * | 2011-03-14 | 2013-11-19 | Northrop Grumman Systems Corporation | Metamaterial for a radio frequency communications apparatus |
| US9431709B2 (en) * | 2012-04-03 | 2016-08-30 | Wemtec, Inc. | Artificial magnetic conductor antennas with shielded feedlines |
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| CN105655721A (en) * | 2015-08-03 | 2016-06-08 | 西安电子科技大学 | Double-waveband composite broadband wave absorbing material based on frequency selective surface |
| CN108148289A (en) * | 2016-12-05 | 2018-06-12 | 洛阳尖端技术研究院 | A kind of Meta Materials base material and preparation method thereof |
| CN107946761A (en) * | 2017-11-03 | 2018-04-20 | 吉林化工学院 | A kind of iron-based wave-absorber based on bandpass-type frequency-selective surfaces |
| CN108617160A (en) * | 2018-06-22 | 2018-10-02 | 四川大学 | A kind of absorbing material and preparation method thereof |
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