摘要
研究设计了一种S频段宽带领结型贴片结构的微波吸波层.从Floquet定理可得,电磁波照射到周期结构时其反射及透射波可分解为一系列Floquet模,周期结构尺寸的减小会使得高阶模成为衰减波并抑制其反射,这一现象有利于吸波层的设计.但由于减小单元尺寸限制了单元内部贴片的尺寸,不利于周期单元在较低频段谐振.基于天线理论,选择领结型结构作为周期单元贴片,设计出了一种宽带超薄型微波吸波层.通过仿真和样品测试,该吸波层的10dB吸波率带宽覆盖整个S频段并达到90%,而其厚度小于频段中心频点自由空间波长的1/7.
This paper presents a novel wideband absorber screen in S-Band based on the bow-tie patch periodical array.From the Floquent's theorem,the reflection and transmission wave is composed of a series of Floquet mode as the electromagnetic wave incident upon a periodical structure.The higher Floquet mode will be evanescent wave with the decreasing of the unit cell size,which is benefit for the absorber designing.However,the decrement of the size limits the length the patch in the unit cell,and it could not resonant at a lower frequency.This paper adopts a bow-tie structure in the antenna theory and design a wideband and thin absorber screen.The geometric sizes of the cell are determinate after the optimization by HFSS software.The measurement results exhibit this screen has a wideband covering S-band and over 90% for 10 dB absorption and its depth is about 1/7wavelength of centre frequency in free space.
出处
《电波科学学报》
EI
CSCD
北大核心
2015年第2期323-327,共5页
Chinese Journal of Radio Science
基金
福建省自然科学基金(批准号:2011j01351)
中央高校财政扶持项目(批准号:2011ZD01G01)
华侨大学基金(批准号:08BS411)