Novel absorptive frequency selective surface with wideband absorbing properties
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摘要: 提出了一种新型的频率选择表面, 该结构具有良好的高频透射性能和较低频带的宽带吸收性能。吸收频率选择表面结构由有损层和带通层组成。通过等效电路法的分析, 有损层应该在通带内产生并联谐振, 因此给出了具体的等效电路模型并在ADS中进行了验证。在有损层的设计中, 在金属交叉贴片中加载两个电阻使其分为两部分实现了并联谐振。带通层利用无损耗槽型频率选择表面实现。仿真结果表明, 在12.75GHz时只有0.7dB的插入损耗, 并且实现了4.8GHz到11.2GHz的宽带吸收。最后, 制作了实物并进行了测试, 实验结果与仿真结果吻合得很好。Abstract: This paper presents a novel frequency selective surface with good transmissive property at high frequency and wideband absorption over lower band.The absorptive frequency selective surface structure is composed of a lossy layer and a bandpass layer.The analysis by the equivalent circuit method shows that the lossy layer should generate parallel resonance in the passband, so the specific equivalent circuit model is given and verified in Advanced Design System.In the design of the lossy layer, two lumped resistors are loaded into the metallic cross-type patch to divide it into two parts for parallel resonance.The bandpass layer is implemented using a lossless slot-type Frequency Selective Surface.The simulation results show that an insertion loss of 0.7 dB can be obtained at 12.75 GHz, and a wide absorption band from 4.8 GHz to 11.2 GHz is realized.A prototype was fabricated and tested, and the experimental results are in good agreement with the simulation results.
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图 4 不同工作频率下有损层的表面电流分布
Figure 4. Surface current distributions of lossy layer at different operating frequencies
图 5 基于ECM和HFSS的反射/透射系数仿真结果
Figure 5. Simulation results of reflection/transmission coefficients based on ECM calculations and HFSS
图 8 反射/透射系数和吸收率的仿真结果
Figure 8. Simulation results of reflection/transmission coefficients and absorptivity
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