摘要
Salisbury屏是一种基本的吸波结构,在谐振频率点具有良好的吸波性能,但是它的厚度必须为四分之一倍的波长,这不利于工程的应用。本文在Salisbury屏的阻抗层设计中引入了有耗的频率选择表面贴片,有效减小了Salisbury屏的厚度,形成一个电磁带隙吸波结构。应用微遗传算法对频率选择表面贴片的几何图形及表面阻抗、结构的周期大小、介质的厚度等参数进行最优化处理。设计得到的两个在谐振频率点处具有良好吸波性能的超薄电磁带隙吸波结构验证了本文方法的正确性与可靠性。
The Salisbury screen is the basic design of absorbers,it has a good absorbing properties at the resonant frequency.However,the thickness of the absorber must be λ/4,that is not suitable for engineering applications.In this paper,we demonstrate that placing a resistive sheet in close proximity to a lossy frequency selective surface,and reducing the overall thickness of the absorber,we can design a electromagnetic band gap absorber.Meanwhile,the geometrical structure and corresponding resistance of the lossy frequency selective surface,the thickness and unit cell size of the absorber is optimized by using a genetic algorithm to achieve the thinnest possible absorber.Two examples of genetically engineered electromagnetic band gap absorbers are presented and discussed.
出处
《微波学报》
CSCD
北大核心
2010年第S1期35-38,共4页
Journal of Microwaves
