Materials Research Bulletin
Design and simulation of a new type of stealthy material are presented, including theory, methodology, and results/discussion. This material consists of a three-dimensional periodic lattice of SiC ceramic dielectric rods with SiO2 as matrix. Transmission, reflection and absorption coefficients of the material are calculated. Proper parameters which meet the stealthy requirements are obtained from the numerical calculation. It's found that when conductivity is equal to 1 x 10(0.4) Sm-1, the maximum absorption loss is got at 6 GHz. The main advantages of this material are light-weight, high temperature stability, and high impedance matching the free space. (C) 2006 Elsevier Ltd. All rights reserved.
关键词:
photonic crystals
Smart Materials & Structures
Modeling and prediction of electromagnetic wave absorbing properties of SiC foams as novel stealth materials in the X-band range of 8.2-12.4 GHz are presented. Appropriate material parameters, including the conductivity, volume fraction, cell size, thickness, and surface modified foam structure, are determined through optimization calculations, where the impedance difference between the SiC foam and free space is minimized. The minimum reflection coefficient, reaching -8 dB, is obtained when the SiC conductivity is about 2.27 S m(-1), the volume fraction is 28%, and the thickness is 20 mm in the case of SiC foam. For surface modified foam, the reflection can be less than -10 dB throughout the entire band investigated.
关键词:
photonic crystals
许丹
,
张涛涛
,
闫共芹
材料导报
作为一种折光指数呈周期性分布的材料,光子晶体在功能器件、光学纤维和光学伪装材料等方面有潜在重要的应用.总结了以垂直沉积自组装法为基础,通过不同方法来制备光子晶体的研究进展,以及利用这些方法进一步制备各种具有不同复杂结构光子晶体的进展,总结了这些方法制备光子晶体的优缺点,并展望了垂直沉积自组装法制备光子晶体的发展趋势.
关键词:
光子晶体
,
自组装
,
垂直沉积法
,
蛋白石结构
