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提出了一种具有多传输零点的二阶带通三维频率选择表面(Three-dimensional Frequency Selective Surface, 3D FSS),单元结构由上下端面刻蚀相同金属方环的介质方块、金属方筒和介质方筒嵌套而成，形成了方波导(Square Waveguide, SW)和平行板波导(Parallel Plate Waveguide, PPW)2个传播路径。SW路径上下端面均构成由LC串联谐振器与电感并联的混合谐振单元。借助这2个混合谐振单元之间的电磁耦合作用，实现了3D FSS的二阶通带和宽阻带特性。此外，PPW路径与SW路径出射端的电场矢量反相抵消，在通带左侧产生了第3个传输零点。借助等效电路建模和设计参数分析，阐述了FSS的工作机理。仿真结果表明，所提出的3D FSS单元电尺寸为0.215λ0×0.215λ0(λ0为自由空间波长),3 dB通带相对带宽为7.9%,20 dB阻带相对带宽为50%,并在0°～60°入射角范围内传输频响具有较好的角度稳定性和极化一致性。
Abstract：A second-order bandpass Three-dimensional Frequency Selective Surface(3D FSS) with multiple transmission zeros is proposed. The unit cell of the proposed 3D FSS is nested by the cuboid dielectric block with two identically-sized metallic square loops on the top and bottom surfaces, the metal square tube, and the dielectric tube, respectively. Two propagation paths of Square Waveguide(SW) and Parallel Plate Waveguide(PPW) are created. The hybrid resonant elements composed of serial LC resonator and inductor are obtained on the top and bottom surfaces of SW path. Second-order passband and wide stopband characteristics of 3D FSS are realized by the aid of the electromagnetic coupling between the two hybrid resonant elements. Moreover, the third transmission zero located at left-side of passband is introduced due to the counteraction of out-of-phase electric field vectors between SW path and PPW path. The working principle of the FSS is explained by the equivalent circuit modeling and design parameters analysis. The simulated results show that the electrical size of unit cell is 0.215λ0×0.215λ0(λ0 is the free-space wavelength); the 3 dB relative bandwidth of the passband is 7.9%; the 20 dB relative bandwidth of the stopband is 50%, and the transmission frequency response has good angular stability and polarization consistency in the range of 0°～60° incident angles.
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基本信息:
DOI：
中图分类号:TN713
引用信息:
[1]于正永,丁胜高,唐万春.一种具有多传输零点的二阶带通三维频率选择表面[J].无线电工程,2023,53(02):431-438.
基金信息:
苏电英才工程; 江苏高校“青蓝工程”; 射频集成电路与系统创新团队(JSEIYC2020002); 江苏省高等学校自然科学研究面上项目(19KJB510002); 江苏省“333工程”科研资助项目(BRA2018315)~~