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A design method of s/c dual-band multilayer tunable frequency selective surface

A frequency-selective surface and design method technology, applied to antennas, electrical components, etc., can solve problems such as single operating frequency and poor low-frequency absorbing performance, and achieve high absorbing strength, thin overall thickness, and high production efficiency.

Active Publication Date: 2022-08-09
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention aims to solve the technical problems of poor low-frequency wave-absorbing performance and single working frequency in the existing frequency selective surface, and provides a preparation method of S / C dual-band multilayer tunable frequency selective surface

Method used

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  • A design method of s/c dual-band multilayer tunable frequency selective surface
  • A design method of s/c dual-band multilayer tunable frequency selective surface
  • A design method of s/c dual-band multilayer tunable frequency selective surface

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Embodiment 1

[0034] Embodiment 1: The design method of a kind of S / C dual-band multi-layer tunable frequency selective surface in this embodiment is carried out according to the following steps:

[0035] Step 1. Add 4.39g of polyvinyl butyral (PVB) powder to 50ml of absolute ethanol, stir with a magnetic stirrer at room temperature until the solution is transparent (takes about 10h) to obtain an ethanol solution of PVB, and then add different The amount and type of powder, as well as 5ml tributyl phosphate and 3ml dibutyl phthalate, were stirred in a vacuum mixer at a speed of 300rpm for 20min to obtain a suspension, and then the suspension was evenly poured on the casting machine , the blade speed is set to 10mm / s, the height is set to 1mm, the film is obtained by the casting method, and the film is naturally air-dried for 24h, dried or air-dried at room temperature to obtain multiple films;

[0036] Step 2, place the multiple films obtained in step 1 in a laser engraving machine, and use...

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Abstract

A preparation method of an S / C dual-band multi-layer tunable frequency selective surface belongs to the technical field of dual-band frequency selective surfaces. The invention aims to solve the technical problems of poor low-frequency wave absorption performance and single working frequency in the existing frequency selective surface. The method of the invention is as follows: 1. Add polyvinyl butyral powder into absolute ethanol, stir with a magnetic stirrer at room temperature until the solution is transparent, then add powders of different amounts and types, as well as tributyl phosphate and o-phenylene Dibutyl dicarboxylate, stir again to obtain a suspension, then cast to form a film, dry or air-dried to obtain a plurality of films; 2. Carve separately to obtain a honeycomb structure on the film to obtain a plurality of single-layer frequency selective surfaces ; Step 3, and then stack them together in different ways, test the absorbing performance separately, draw its reflection loss curve, and summarize the changing law of the absorbing performance. The invention has good stealth effect for radar wave detection of S and C bands.

Description

technical field [0001] The present invention belongs to the technical field of dual-band frequency selective surfaces. Background technique [0002] Frequency selective surfaces have a wide range of needs in the military and civilian fields. When frequency selective surfaces are used in radar stealth technology, due to their frequency selection characteristics, electromagnetic waves at the working frequency are reflected or absorbed, and electromagnetic waves outside the working frequency band can pass through normally. The surface is selected over frequency to achieve electromagnetic stealth. The radar stealth technology is mainly aimed at the low frequency L (1~2GHz), S (2~4GHz), C (4~8GHz), X (8~12GHz) band microwaves, but the existing frequency selection surfaces are mostly high microwave frequency band, and the absorption strength is weak, the absorption bandwidth is narrow, and it is impossible to achieve full coverage of a certain band. In addition, the research on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00H01Q15/00
CPCH01Q17/00H01Q15/0013
Inventor 李均沈振宇刘璐璐周忠祥
Owner HARBIN INST OF TECH
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