基于曲折型单元的双频段频率选择表面  

Design of Dual-band Frequency Selective Surface Based on Tortuous Element

作　　者：刘宁[1] 盛贤君[2] 

机构地区：[1]大连理工大学创新实验学院,辽宁大连116024 [2]大连理工大学电气工程学院,辽宁大连116024

出　　处：《计算机仿真》2016年第1期58-62,共5页Computer Simulation

摘　　要：在卫星天线双频段频率选择表面(FSS)的研究中,需设计具有特定谐振频段的FSS结构,但双频段FSS结构的谐振频段易受电磁波的极化方式、入射角度的影响,难以满足多频段卫星天线副反射器等装备的使用需求。为解决上述问题,设计了一种基于曲折型单元的双频段FSS结构:在介质层两侧分别加载由"十"字形单元与曲折型单元构成的单元阵列,获得双频段的透波特性。运用等效电路法分析双频段FSS结构的等效传输模型。利用有限元分析软件HFSS对TE和TM波不同角度入射下的不同曲折系数FSS结构传输情况进行仿真。研究结果表明,单元曲折系数越大,谐振频率越低,谐振带宽越小;FSS结构具有较高的极化和角度稳定性。结果表明,可通过调节单元曲折系数,满足不同谐振频带的设计需求。Dual-band frequency selective surfaces with specific frequency bands are needed. However, the resonant frequency bands are easy to be affected by the polarizations and incident angles and it is difficult to meet the use demands of muhihand satellite antenna subreflector and so on. To solve this problem, a novel dual-band frequency selective surface is proposed in this article. The proposed frequency selective surface is achieved by loading frequency selective surfaces consisting of basic cross shaped metallic patch and its tortuous element on both side of dielectric substrate, respectively. The method of equivalent circuit is adapted to analyze the transmission line model of the double-band FSS and commercial software HFSS is implemented to simulate the performance of the proposed FSSs consisting of tortuous elements with different tortuosity. The simulation results indicate that the resonant frequency band of the proposed FSS shows great stability with respect to polarizations and incident angles. Also, the bigger the tortuous coefficient is, the smaller the resonant frequency and the bandwidth become. Therefore, different resonant band can be achieved by adjusting the tortuous coefficient.

关 键 词：频率选择表面 单元曲折结构 双频段 等效电路法 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]