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A kind of chiral microwave absorbing metamaterial and its preparation method

A technology of microwave absorption and metamaterials, which is applied in the direction of antennas and electrical components, can solve the problems of difficulty in processing and manufacturing, the influence of absorption effect, and the overall thickness of the absorber, and achieve the effects of easy control, easy application and promotion, and low preparation cost

Active Publication Date: 2021-03-16
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inductive methods to broaden the frequency band of microwave absorbing materials can be divided into two categories. One is to combine multiple resonator units in one plane to form a multi-band absorber that can respond to multiple frequency bands. Each of these absorbers Coupling will inevitably occur between resonators, and this coupling will affect the absorption effect; the other is to stack multiple resonators into a multi-layer absorber, which makes the overall thickness of the absorber thicker. Manufacturing becomes more difficult

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  • A kind of chiral microwave absorbing metamaterial and its preparation method
  • A kind of chiral microwave absorbing metamaterial and its preparation method
  • A kind of chiral microwave absorbing metamaterial and its preparation method

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preparation example Construction

[0035] The invention relates to the preparation and application of a chiral microwave absorbing metamaterial. Using chiral helical structures (springs and tower springs) as periodic structural units, microwave absorbing metamaterials with different periods are constructed by vertical coaxial nesting on a 2mm thick, 180mm×180mm FR4 substrate and distributed in a two-dimensional array. The outer diameter of the spiral structure wire is 0.5-3cm, the wire diameter is 0.45-1mm, the number of turns is 1.5-6 turns, and the pitch is 2.5-5mm; the period of the metamaterial is a two-dimensional array of 5×5, 8×8, and 14×14. When the polarization mode of the incident electromagnetic wave matches the polarization mode of the helical structure, a strong surface current will be induced, and then play the role of resonant microwave absorption. The design idea of ​​the present invention is novel, and the chiral microwave absorbing metamaterial has a remarkable strong absorption-broadband-ligh...

Embodiment 1

[0039] First design a 5×5 concentric circle pattern with DXP software, and the diameters of the concentric circles are 1cm, 2cm, and 3cm respectively. Connect the fully automatic drilling, milling and engraving integrated machine, fix the 2.0mm×180mm×180mm FR4 substrate in the engraving area, and carry out hollow engraving; , are sequentially embedded in the hollow gaps of concentric circles, distributed in a 5×5 array, and a single helical chiral metamaterial is obtained.

[0040] The reflectivity of the chiral material was tested by arch method. Its sample physical map and reflectance curve are as follows figure 1 – image 3 shown. It can be seen that when the electromagnetic wave incident angle is 120°, the frequency bandwidth of the chiral microwave absorbing metamaterial is less than or equal to –10dB is about 10.4 GHz, and the strongest absorption peak is –40.1dB.

Embodiment 2

[0042]The steps are the same as in Example 1, except that a large iron spring with an outer diameter of 3cm, a wire diameter of 0.45mm, a pitch of 5mm, and a number of turns of 3 turns is used here, and a large iron spring with an outer diameter of 2cm, a wire diameter of 0.45mm, a pitch of 5mm, and a number of turns Three coils of small iron springs coaxially nest the two helical structures in a two-dimensional array of 5×5. Its sample physical map and reflectance curve are as follows Figure 4 – Image 6 shown. It can be seen that when the electromagnetic wave incident angle is 90°, the frequency bandwidth of the chiral microwave absorbing metamaterial is less than or equal to –10dB is about 17.1 GHz, and the strongest absorption peak is –31.3dB; when the electromagnetic wave incident angle is 120°, the chiral microwave absorbing metamaterial The frequency bandwidth of the microwave absorbing metamaterial is less than or equal to –10dB is about 27.1GHz, and the strongest a...

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Abstract

The present invention relates to a preparation and an application of a chiral microwave absorbing metamaterial. The structural unit of the material is of a chiral helical structure and the helixes with different outer diameters are coaxially nested perpendicular to a substrate and distributed in a two-dimensional array. The preparation method of the material is that the chiral helical structure isused for periodic structural units which are coaxially nested perpendicular to the substrate and distributed in the two-dimensional array so that the microwave absorbing metamaterial with different periods are constructed. The material has a remarkable strong absorption-broadband-lightweight microwave absorption effect; the preparation process is simple; the raw materials are low-cost and easilyavailable; the performance is easy to adjust; and the material has broad application prospects, for example, it can be applied to the military field for stealth of fixed military equipment, a buildingand a tank and applied to the civilian fields such as an anechoic chamber, electromagnetic compatibility and electromagnetic pollution protection.

Description

technical field [0001] The invention relates to the field of electromagnetic functional materials, in particular to the preparation and application of a microwave-absorbing metamaterial of a chiral structural unit. Background technique [0002] The so-called electromagnetic metamaterials refer to some artificial composite structures or composite materials with extraordinary physical properties that natural materials do not have. By orderly designing the key physical dimensions of the material structure, people can break through the limitations of some natural laws and artificially obtain "new media" with extraordinary physical properties that are completely different from natural media. As a new member of the microwave absorbing material family, the metamaterial microwave absorbing structure has the biggest advantages compared with the traditional laminate structure microwave absorber and sandwich structure microwave absorber, such as thin thickness and wide absorption frequ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00H01Q17/00
Inventor 和子栋童国秀陆瑶王帆琦陈锡炜郭超吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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