摘要
频率选择表面(FSS)对于不同频率的入射电磁波,具有不同的传输特性。由于其独特的传输特性,被广泛应用于卫星天线的频率复用、空间滤波器、天线罩及阵列天线的设计之中。在实际工程应用中,电磁波的入射角度和极化方式均是未知的。当电磁波的入射角度增大时,谐振频率会随着入射波极化方式的改变而产生较大的漂移。传统的频率选择表面通过采用多层级联式结构和加介质的方式获得宽带带通传输。不仅大大增加了频率选择表面的设计尺寸,而且对加工材料提出了很高的要求。文章提出了一种新的FSS单元设计方法,该FSS单元采用多谐振式结构,在介质板的两侧采用对称的微带单元结构,谐振腔单元之间由通孔进行连接。该FSS单元在X波段实现了二阶带通滤波特性,并且在通带两侧存在两个传输零点。另外,通过对FSS单元进行对称旋转,设计了一种新的级联式结构的频率选择表面。所设计的级联式结构的FSS构造简单紧凑,实现了无论是TE还是TM偏振入射波,都能获得稳定的宽带带通传输响应特性。兼具了极化和角度的稳定性。
Frequency selective surface(FSS)has different transfer characteristics for different frequencies of incident electromagnetic wave.Because of its unique transfer characteristics,It is widely used in the design of the Frequency reuse of satellite antennas,spatial filter,radome and array antenna.In practical application,the incident angle and the polarization of electromagnetic wave is unknown.When the incident angle of the electromagnetic wave increases,the resonance frequency will drift greatly by ways of the polarization of incident wave changes.Multi-layer cascade structure and medium-added are used to obtain stable broadband band-pass transmission in traditional Frequency selective surface.The paper present a new design of FSS modular,its use Multi Resonance Structure,symmetrical microstrip cell structure is used on both sides of the dielectric plate,the cavity resonators is connected by through hole.The FSS modular can realize second-order band-pass filtering characteristics in the X-band,and there are two transmission zeros on both sides of the band-pass.In addition,a new Cascade Structure FSS is design by symmetrical rotation of FSS modular.The designed cascade structure FSS has simple structure,small size and compact structure.The designed cascade structure of FSS is simple and compact.It is realized that both TE and TM polarized incident electromagnetic wave can obtain stable broadband band-pass transmission response characteristics.It combines polarization and angle stability to meet the requirements of actual engineering applications.
作者
刘海良
初华强
LIU Hai-liang;CHU Hua-qiang(Fire Control Technology Center of China South Industries Group Corporation,Chengdu 611731,China)
出处
《微波学报》
CSCD
北大核心
2020年第S01期116-118,共3页
Journal of Microwaves
关键词
频率选择表面
多谐振式结构
级联式结构
宽带带通传输
Frequency selective surface
Multi Resonance Structure
Cascade Structure
Broadband Band-pass Transmission
