光学/毫米波双模共口径曲面谐振网栅光电窗电磁屏蔽机理与器件

In order to solve the challenging problem of electromagnetic interference, a novel filtering method of highly transparent resonance mesh coating is proposed for optic/millimeter-wave(MMW) dual-model co-aperture detection curved optoelectronic window based on conformal optics, highpass filtering of transparent conductive mesh coating and bandpass filtering of periodic circle-loop aperture pattern. The proposed highly transparent resonance mesh optical window can simultaneously achieve some advantages: good optical transmission characteristic, stable MMW bandpass filtering and strong electromagnetic shielding effectiveness. And the corresponding theories, models and technique basis are researched. The research mainly consists of five aspects: 1)A novel filtering method for optic/MMW dual-mode detecting window by integrating high transparency mesh highpass filtering with frequency selective surface bandpass filtering mechanisms, diffractive intensity distribution characteristics and electromagnetic scattering mechanisms ; 2) MMW bandpass filtering analysis models of the proposed resonance mesh microstructure array and analysis of bandpass filtering characteristics and rules; 3) The optical diffraction characteristics analysis models of the proposed resonance mesh micro-structure array and analysis of highly transparency characteristics and rules; 4) An optimization design method and evaluation function of the resonance mesh micro-structure array optoelectronic windows; furthermore, the manufacture processing, testing and evaluation MMW bandpass filtering characteristics, electromagnetic shielding performances and optical diffraction distribution of experimental samples of resonance mesh optoelectronic windows; 5)Main technique index: zero-order optical transparency is higher than 88%, MMW resonance frequency is 32GHz with a transmission of 90%, and electromagnetic shielding effectiveness of experimental samples of resonance mesh optoelectronic windows is higher than 10dB in microwave interference frequency band from 2 to 18GHz. This fund project can provide theory basis and technique support of electromagnetic shielding for dual-mode co-aperture detecting curved optoelectronic windows.

为解决光学/毫米波双模共口径曲面光电窗的电磁屏蔽问题，融合共形光学技术、透明导电金属网栅高通滤波和圆环孔径周期阵列带通滤波机理，提出一种兼具优良光学衍射特征、稳定毫米波带通滤波和强电磁屏蔽效率的谐振网栅微结构阵列电磁屏蔽方法。主要研究内容包括：1)提出一种基于高透光率谐振网栅微结构阵列的光学/毫米波共口径曲面光电窗电磁屏蔽机理，提高毫米波带通滤波稳定性和光学成像质量；2)构建曲面谐振网栅微结构阵列毫米波带通滤波理论模型；3)构建谐振网栅微结构阵列光学衍射理论模型；4)建立谐振网栅微结构阵列最优性能评价函数与优化方法，探索谐振网栅器件制备工艺，实验研究电磁滤波机理和光学衍射特性；5)主要技术指标：光学透光率优于88%，探测毫米波谐振频率32GHz的透射率优于90%，微波干扰波段2-18GHz的电磁屏蔽效率优于10dB。项目的完成可为光学/毫米波共口径曲面光电窗电磁屏蔽提供理论和技术基础。

本项目融合共形光学技术、透明导电金属网栅高通滤波和圆环孔径周期阵列带通滤波机理，提出一种兼具优良光学衍射特征、稳定毫米波带通滤波和强电磁屏蔽效率的谐振网栅微结构阵列电磁屏蔽方法，解决了光学/毫米波双模共口径光电窗的电磁屏蔽问题。主要完成了以下研究内容：提出了一种基于高透光率谐振网栅微结构阵列的光学/毫米波共口径曲面光电窗电磁屏蔽机理，提高毫米波带通滤波稳定性和光学成像质量；构建了曲面谐振网栅微结构阵列的毫米波带通滤波理论模型；构建了谐振网栅微结构阵列的光学衍射理论模型；建立了谐振网栅微结构阵列最优性能评价函数与优化方法和谐振网栅器件制备工艺，实验研究了电磁滤波机理和光学衍射特性；达到如下主要技术指标：光学透射率为91.6%，探测毫米波带通透射率为-0.64dB，对微波干扰频段电磁屏蔽效率优于10dB。项目的完成为光学/毫米波共口径光电窗电磁屏蔽提供理论和技术基础。