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: 2021-07-30
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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  • Design method of S/C dual-band multilayer tunable frequency selective surface
  • Design method of S/C dual-band multilayer tunable frequency selective surface
  • 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 type frequency selective surface in the present embodiment is carried out according to the following steps:

[0035] Step 1. Add 4.39g of polyvinyl butyral (PVB) powder into 50ml of absolute ethanol, stir at room temperature with a magnetic stirrer until the solution is transparent (it 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, and then stir in a vacuum mixer at a speed of 300rpm for 20min to obtain a suspension, and then pour the suspension evenly on the casting machine , set the scraper speed to 10mm / s, set the height to 1mm, obtain a film by casting method, and let it dry naturally for 24 hours, dry or dry naturally 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 AutoC...

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Abstract

The invention discloses a preparation method of an S/C dual-band multilayer tunable frequency selective surface, and belongs to the technical field of dual-band frequency selective surfaces. The invention aims to solve the technical problems of poor low-and-medium-frequency wave-absorbing performance and single working frequency of the existing frequency selective surface. The method comprises the following steps: 1, adding polyvinyl butyral powder into absolute ethyl alcohol, performing stirring at room temperature by using a magnetic stirrer until the solution is transparent, then adding different dosages and types of powder, tributyl phosphate and dibutyl phthalate, performing stirring again to obtain turbid liquid, and then carrying out film casting, drying or air drying to obtain a plurality of thin films; 2, respectively performing engraving, and obtaining a honeycomb structure on the film to obtain a plurality of single-layer frequency selective surfaces; 3, stacking together according to different modes, respectively testing the wave-absorbing performance, drawing a reflection loss curve graph, and summarizing the change rule of the wave-absorbing performance. The method has a good stealth effect on radar wave detection of S and C wave bands.

Description

technical field [0001] The present invention belongs to the technical field belonging to dual-band frequency selective surfaces. Background technique [0002] Frequency selective surfaces have a wide range of demands in the military and civilian fields. When frequency selective surfaces are applied to radar stealth technology, due to their frequency selective characteristics, the electromagnetic waves of the working frequency are reflected or absorbed, and the electromagnetic waves outside the working frequency band can pass through normally. Electromagnetic cloaking can be achieved through frequency selective surface. Radar stealth technology is mainly aimed at low-frequency L (1-2GHz), S (2-4GHz), C (4-8GHz), X (8-12GHz) band microwaves, but most of the existing frequency selection surfaces are high Microwave frequency band, and the absorption intensity is weak, the absorption bandwidth is narrow, and it is impossible to achieve full coverage of a certain band. In additi...

Claims

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Application Information

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Patent Type & Authority Applications(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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