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基于混合周期栅网结构的频率选择表面设计研究?
Design and study of frequency selective surface based on hybrid p erio d metallic mesh
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摘要: 在栅网结构上设计的频率选择表面能够同时实现红外高透过率和毫米波带通的物理特性。为了提高其光学透过率，降低表面电阻，抑制高次衍射能量对光学系成像质量的影响，本文通过分析基于栅网结构的频率选择表面衍射光强和表面电流，提出一种新型基于混合周期栅网结构的频率选择表面。计算及实验结果均表明：在实现稳定的毫米波带通滤波的同时，基于混合周期栅网结构的频率选择表面红外透过率提高了5%以上，表面电阻平均降低了4?，有效地抑制了因高次衍射能量集中分布而对红外光学系统成像质量的影响。Abstract: Frequency selective surface based on metallic mesh can realize the physical properties of both high infrared transmit-tance and millimeter-wave band-pass filter. In order to improve the optical transmittance, reduce surface resistance and suppress the effect of high order diffraction energy on the imaging quality of the optical system, a new design of frequency selective surface based on hybrid period metallic mesh is obtained. In this paper, the diffraction intensity distribution and surface current of frequency selective surface are analyzed based on metallic mesh. Simulation and experimental results show that frequency selective surface based on hybrid period metallic mesh realizes a stable millimeter-wave band-pass filter property, at the same time, it obtains 5% increase of infrared transmittance and 4 ? reduce of surface resistance. New design of frequency selective surface based on hybrid period metallic mesh effectively suppresses the effect of high order diffraction energy on the imaging quality of the optical system.
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