High-frequency band absorption type multilayer fabric base cloth and preparation method thereof

Abstract

This invention relates to the field of functional composite materials technology, and particularly to a high-frequency absorbing multilayer woven fabric and its preparation method. An embodiment of this invention provides a high-frequency absorbing multilayer woven fabric, which, along its thickness direction, sequentially comprises a frequency selective layer, a dielectric modulating layer, and a penetration blocking layer; the frequency selective layer comprises multiple periodically arranged periodic patterns obtained from conductor fabrication for absorbing the Ka-band. This invention provides a high-frequency absorbing multilayer woven fabric and its preparation method, which not only maintains good electromagnetic absorption in the 26-40 GHz high-frequency range, but also possesses the flexibility and durability of a fabric.

Description

Technical Field

[0001] This invention relates to the field of functional composite materials technology, and in particular to a high-frequency absorbing multilayer fabric base material and its preparation method. Background Technology

[0002] With the widespread application of the Ka band (26-40 GHz) in satellite communications, high-speed data transmission, and other fields, the demand for electromagnetic wave absorption is becoming increasingly prominent. Currently, traditional absorbing materials suffer from narrow absorption bandwidth, high surface density, and poor flexibility, making it difficult to simultaneously meet the impedance matching and lightweight requirements of high-frequency bands. Existing flexible absorbing structures are prone to performance instability in the Ka band due to their short wavelength and thickness sensitivity. Although multi-layered structural designs can optimize impedance matching, most fabrics still face challenges in the Ka band, including insufficient effective absorption bandwidth and the difficulty in balancing mechanical strength and lightweight design. Therefore, there is an urgent need to develop fabric-based materials that combine broadband absorption, flexibility, and durability. Summary of the Invention

[0003] This invention provides a high-frequency absorbing multilayer fabric base material and its preparation method, which not only maintains good electromagnetic absorption effect in the high-frequency range of 26~40 GHz, but also has the flexibility and durability of the fabric.

[0004] In a first aspect, embodiments of the present invention provide a high-frequency absorption type multilayer fabric base material, which includes, in sequence along the thickness direction, a frequency selection layer, a dielectric conditioning layer and a permeation barrier layer; The frequency selective layer comprises a periodic pattern of multiple periodically arranged conductors for absorbing the Ka band.

[0005] Optionally, the periodic pattern includes three concentric square rings, each square ring having a strip cutout that runs along its diagonal through the square ring, the midpoints of the four sides of the inner ring of the innermost square ring being connected to form a cross-shaped metal sheet, and the midpoints of the inner and outer rings of any two adjacent square rings being connected by a metal strip.

[0006] Optionally, the arrangement period P of the periodic pattern is 7.7±0.4 mm, the outermost square ring has an outer ring side length L1=6.5±0.3 mm and a ring width W1=0.5±0.1 mm, the middle square ring has an outer ring side length L2=5.5±0.3 mm and a ring width W2=0.5±0.1 mm, and the innermost middle square ring has an outer ring side length L3=4.5±0.2 mm and a ring width W3=0.2±0.05 mm.

[0007] Optionally, the frequency selection layer forms a periodic pattern on the fabric surface by printing, which is used to enhance energy loss through local electromagnetic resonance.

[0008] Optionally, the dielectric conditioning layer comprises a multilayer sub-conditioning layer prepared by blending organic fibers and low dielectric fibers. The dielectric constant of the multilayer sub-conditioning layer is gradient distributed along the thickness direction, and the electromagnetic wave is gradually attenuated by plain weave.

[0009] Optionally, the multilayer sub-conditioning layers are composited using a hot-pressing process to ensure electrical continuity.

[0010] Optionally, the barrier layer is made of a blend of stainless steel fibers and polyester fibers, with a metallized surface to block transmitted waves and form a wave trap structure.

[0011] Optionally, the sheet resistance of the frequency selection layer is 35~55 Ω / sq.

[0012] Optionally, the thickness of the dielectric conditioning layer ranges from 0.2 to 0.4 mm; The thickness of the barrier layer ranges from 0.1 to 0.2 mm, and the conductivity of the barrier layer ranges from 1.2 × 10⁻⁶. 6 ~1.6×10 6 S / m.

[0013] Secondly, embodiments of the present invention provide a method for preparing a high-frequency absorption multilayer fabric base material, used to prepare any of the high-frequency absorption multilayer fabric base materials described above, the preparation method comprising: A frequency selection layer, a dielectric modulation layer, and a penetration barrier layer are stacked sequentially along the thickness direction; Integrated molding is achieved through a high-temperature heat sealing process.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: By using multiple periodic patterns arranged periodically in the frequency-selective layer, Ka-band electromagnetic waves can be fully absorbed. The dielectric modulation layer can adjust the dielectric constant, and the penetration-blocking layer is used to block transmitted waves. The product provided in this application not only maintains good electromagnetic absorption performance in the high-frequency range of 26~40 GHz, but also possesses the flexibility and durability of fabric. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a longitudinal cross-sectional view of a high-frequency absorption type multilayer fabric base material provided in an embodiment of the present invention; Figure 2This is a schematic diagram of a layered square-shaped structure provided in an embodiment of the present invention; Figure 3 This is a test curve of the reflectance of a test sample provided in an embodiment of the present invention.

[0017] Figure label: 1-Frequency Selection Layer; 2-Dielectric modulation layer; 3-Barrier layer. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] Please refer to Figures 1 to 3 This invention provides a high-frequency absorption type multilayer fabric base material, which includes a frequency selection layer 1, a dielectric conditioning layer 2 and a permeation barrier layer 3 in sequence along the thickness direction; The frequency selection layer 1 includes a periodic pattern of multiple periodic arrangements formed by conductor fabrication for absorbing the Ka band.

[0020] The frequency-selective layer 1, with its multiple periodic patterns, effectively absorbs Ka-band electromagnetic waves. The dielectric modulating layer 2 adjusts the dielectric constant, and the penetration-blocking layer 3 blocks transmitted waves. The product provided in this application not only maintains excellent electromagnetic absorption in the high-frequency range of 26–40 GHz but also possesses the flexibility and durability of fabric.

[0021] In some embodiments of the present invention, the periodic pattern includes three concentric square rings, each square ring having a strip-shaped cutout that runs along its diagonal through the square ring, the midpoints of the four sides of the inner ring of the innermost square ring being connected to form a cross-shaped metal sheet, and the midpoints of the inner and outer rings of any two adjacent square rings being connected by a metal strip.

[0022] In some embodiments of the present invention, the arrangement period P of the periodic pattern is 7.7±0.4 mm, the outermost square ring has an outer ring side length L1=6.5±0.3 mm and a ring width W1=0.5±0.1 mm, the middle square ring has an outer ring side length L2=5.5±0.3 mm and a ring width W2=0.5±0.1 mm, and the innermost middle square ring has an outer ring side length L3=4.5±0.2 mm and a ring width W3=0.2±0.05 mm.

[0023] The aforementioned special shape and parameters enable it to achieve excellent electromagnetic wave absorption in the Ka band.

[0024] In some embodiments of the present invention, the frequency selection layer 1 forms a periodic pattern on the surface of the fabric by printing, which is used to enhance energy loss through local electromagnetic resonance.

[0025] In some embodiments of the present invention, the dielectric conditioning layer 2 comprises a multilayer sub-conditioning layer prepared by blending organic fibers and low dielectric fibers. The dielectric constant of the multilayer sub-conditioning layer is distributed in a gradient along the thickness direction, and the electromagnetic wave is gradually attenuated by plain weave.

[0026] In some embodiments of the present invention, the multilayer sub-conditioning layer is composited by a hot-pressing process to ensure electrical continuity.

[0027] In some embodiments of the present invention, the barrier layer 3 is made of a blend of stainless steel fibers and polyester fibers, and its surface is metallized to block transmitted waves and form a wave trap structure.

[0028] In some embodiments of the present invention, the sheet resistance of the frequency selection layer 1 is 35~55 Ω / sq.

[0029] In some embodiments of the present invention, the thickness of the dielectric conditioning layer 2 ranges from 0.2 to 0.4 mm; The thickness of the barrier layer 3 ranges from 0.1 to 0.2 mm, and the conductivity of the barrier layer 3 ranges from 1.2 × 10⁻⁶. 6 ~1.6×10 6 S / m.

[0030] This invention provides a method for preparing a high-frequency absorption multilayer fabric base material, used to prepare any of the high-frequency absorption multilayer fabric base materials described above. The preparation method includes: Frequency selection layer 1, dielectric conditioning layer 2 and penetration barrier layer 3 are stacked sequentially along the thickness direction; Integrated molding is achieved through a high-temperature heat sealing process.

[0031] Finally, it should be noted that the above embodiments and comparative examples are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments and comparative examples, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments and comparative examples, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments and comparative examples of the present invention.

Claims

1. A high frequency band absorbing multilayer fabric base cloth, characterized by, Along the thickness direction, it includes a frequency selection layer (1), a dielectric conditioning layer (2), and a penetration barrier layer (3). The frequency selection layer (1) comprises a periodic pattern of multiple periodic arrangements obtained from the conductor for absorbing the Ka band.

2. The high-frequency absorption type multilayer fabric base material according to claim 1, characterized in that, The periodic pattern includes three concentric square rings. Each square ring has a strip cutout that runs along its diagonal through the square ring. The midpoints of the four sides of the inner ring of the innermost square ring are connected to form a cross-shaped metal piece. The midpoints of the inner and outer rings of any two adjacent square rings are connected by a metal strip.

3. The high-frequency absorption type multilayer fabric base material according to claim 2, characterized in that, The periodic pattern has an arrangement period P of 7.7±0.4 mm. The outermost square ring has an outer ring side length L1=6.5±0.3 mm and a ring width W1=0.5±0.1 mm. The middle square ring has an outer ring side length L2=5.5±0.3 mm and a ring width W2=0.5±0.1 mm. The innermost middle square ring has an outer ring side length L3=4.5±0.2 mm and a ring width W3=0.2±0.05 mm.

4. The high-frequency absorption type multilayer fabric base material according to claim 1, characterized in that, The frequency selection layer (1) forms a periodic pattern on the fabric surface by printing, which is used to enhance energy loss through local electromagnetic resonance.

5. The high-frequency absorption type multilayer fabric base material according to claim 1, characterized in that, The dielectric conditioning layer (2) comprises a multilayer sub-conditioning layer prepared by blending organic fibers and low dielectric fibers. The dielectric constant of the multilayer sub-conditioning layer is distributed in a gradient along the thickness direction, and the electromagnetic wave is gradually attenuated by plain weave.

6. The high-frequency absorption type multilayer fabric base material according to claim 5, characterized in that, The multilayer sub-conditioning layers are composited using a hot-pressing process to ensure electrical continuity.

7. The high-frequency absorption type multilayer fabric base material according to claim 1, characterized in that, The barrier layer (3) is made of stainless steel fiber and polyester fiber blended together and the surface is metallized to block transmitted waves and form a wave trap structure.

8. The high-frequency absorption type multilayer fabric base material according to claim 1, characterized in that, The sheet resistance of the frequency selection layer (1) is 35~55 Ω / sq.

9. The high-frequency absorption type multilayer fabric base material according to claim 1, characterized in that, The thickness of the dielectric conditioning layer (2) ranges from 0.2 to 0.4 mm; The thickness of the barrier layer (3) ranges from 0.1 to 0.2 mm, and the electrical conductivity of the barrier layer (3) ranges from 1.2 x 10 6 -1.6 x 10 6 S / m.

10. A method for preparing a high-frequency absorbing multilayer fabric base, characterized in that, The method for preparing the high-frequency absorption type multilayer fabric base material according to any one of claims 1-9 includes: A frequency selection layer (1), a dielectric modulation layer (2), and a penetration barrier layer (3) are stacked sequentially along the thickness direction. Integrated molding is achieved through a high-temperature heat sealing process.

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