文章信息/Info

Title:

Influence of disorder on the absorption properties of metamaterial absorbers

作者:

程海峰; 龐永強; 周永江

(國防科技大學,新型陶瓷纖維及其復合材料國防科技重點實驗室,湖南 長沙 410073)

Author(s):

Haifeng Cheng;  Yongqiang Pang;  Yongjaing Zhou

(National University of Defense Technology, Key Laboratory of Science and Technology on Advanced Ceramic Fibers and Composites, Changsha 410073, China)

關鍵詞:

吸波超材料; 無序結構; 碳纖維

分類號:

TB 34

DOI:

10.7502/j.issn.1674-3962.2013.08.04

文獻標志碼:

A

摘要:

近年來，超材料由于其獨特的電磁響應特性得到了世界各國研究者的關注，并得到了廣泛的應用，其中，用于電磁波吸收是研究重點之一。通常情況下超材料由結構單元按照周期排列構成，然而最近無序結構超材料引起了研究者的關注，因為它們表現出了一些比傳統周期結構超材料更加優異的性能。為此，本文系統研究了關鍵結構參數無序化對短切線吸波超材料性能的影響。結果表明，短切線長度的無序化可拓展吸波帶寬，為寬帶吸波材料的設計提供了一種思路，空間取向的無序化可使得短切線吸波超材料電磁特性由單極化響應向任意極化響應轉變，而空間位置的無序化則對吸波性能的影響可忽略不計，在微波頻段進行了數值仿真和實驗測試的驗證，并分析與討論了無序吸波超材料在工程領域的應用前景。本文發展的方法對其他結構以及頻段的吸波超材料也有重要的指導作用。

Abstract:

Metamaterials have attracted considerable attentions due to their engineered electromagnetic properties and potential applications. One important application of metamaterials is the development of absorbers with nearly unity absorbance. For convenience of the fabrication, most current metamaterials are realized as periodic arrays. However, random metamaterials have gained a growing interest recently, because they exhibit some more desirable electromagnetic properties. Therefore, the influences of disorder on the absorption properties of wire-based metamaterial absorbers were studies here. The numerical and experimental results show that the absorption bandwidth can be enhanced by disordering the wire length, providing a valuable method for designing the wideband absorbers. The absorbers allow a transformation from the absorption of only one linear polarization to that of all polarizations by introducing the disorder degree of the wire spatial orientation, but the random spatial position of wires has little effect on the absorption property. The potential application in the field of engineering was also discussed finally. It is expected that the proposed method has can be used in the design of metamaterial absorbers consisting of other resonators and other frequency bands