双频独立可调谐频率选择表面设计与特性分析  

Design and Characteristic Analysis of Dual-Band Independently TunableFrequency Selective Surface

作　　者：张格 巩蕾[1] 周攀 阳志强[1] 王利国[1] 李瑶[1] 杨利红[1] 王海斌 Zhang Ge;Gong Lei;Zhou Pan;Yang Zhiqiang;Wang Liguo;Li Yao;Yang Lihong;Wang Haibin(School of Photoelectric Engineering,Xi’an Technological University,Xi’an 710021,Shaanxi,China)

机构地区：[1]西安工业大学光电工程学院,陕西西安710021

出　　处：《激光与光电子学进展》2024年第15期280-287,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62071359,62001364);陕西省教育厅重点科研计划(20JS059);陕西高校青年创新团队(K20220184);西安工业大学校长基金面上培育项目(XGPY200206)。

摘　　要：设计了一种加载变容二极管的双频独立可调谐带通频率选择表面,该表面的单元结构由加载变容二极管的复合金属表面、Rogers RT5880介质层和底层十字馈线构成。基于时域有限差分法和等效电路法对所设计的模型进行结构优化并验证了其电磁特性。结果表明,分别在外环处和内环处加载0.2、0.4、0.6 pF和0.03、0.06、0.08 pF的等效电容时,谐振中心频率随着电容的增大向低频漂移,分别实现了低频通带和高频通带的频率调谐。基于谐振频率处的表面电场分布,详细阐述了实现双频频率可调谐的物理机制。所设计的双频独立可调谐带通频率选择表面模型具有不需要考虑额外馈线的简单偏置网络结构,为微波波段有源可重构器件提供了新思路。A dual-band independently tunable bandpass frequency selective surface loaded with varactor diodes is designed,in which the unit structure consists of a composite metal surface loaded with varactor diodes,a Rogers RT5880 dielectric layer and an underlying cross feeder.Based on the finite difference time domain method and the equivalent circuit method,the structure of the designed model is optimized,and its electromagnetic characteristics are verified.The results show that when the equivalent capacitance of 0.2,0.4,0.6 pF and 0.03,0.06,0.08 pF is loaded at the outer ring and the inner ring respectively,the resonant center frequency drifts to the low frequency with the increase of the capacitance,and the low frequency passband and the high frequency passband can be modulated respectively.Based on the surface electric field distribution at the resonant frequency,the physical mechanism of dual-band frequency tunability is expounded in detail.The designed dual-band independently tunable bandpass frequency selective surface model has a simple bias network structure without considering additional feeders,which provides a new idea for active reconfigurable devices in the microwave band.

关 键 词：有源频率选择表面 双频 等效电路法 频率独立可调谐 

分 类 号：O441[理学—电磁学]