高透光率金属网栅微波/红外二色波组合器

Microwave/infrared dichroic beam combiner using high transparent metallic mesh

为了实现微波/红外半实物仿真技术中的信号耦合,提出了一种基于高透光率金属网栅的宽频段二色波组合器结构,并建立了金属网栅二色波组合器的微波反射特性和红外透射特性分析模型。为了验证基于高透光率金属网栅的二色波组合器的可行性和分析模型的有效性,利用激光直写工艺在锗基底上制作了金属网栅二色波组合器样片;为了减小倾斜入射时不同极化情况下微波反射率的差异,金属网栅垂直极化和平行极化方向的周期分别设为500μm和400μm。在微波暗室中测量了金属网栅二色波组合器样片在12～18GHz频段的微波反射率,并利用傅里叶红外光谱仪测量了样片在10～12μm波段的红外透射率。计算和测量结果显示,高透光率金属网栅二色波组合器的微波反射率优于-1.5dB,红外透射率约为83%,表明高透光率金属网栅可用作一种新型的宽频段微波/红外二色波组合器。

A novel microwave/infrared dichroic beam combiner based on a high transparent metallic mesh was proposed to achieve the coupling of microwave and infrared signals in a dual-mode Hardware-in-the-Loop（HWIL） simulation system.Analysis models of microwave reflectivity and infrared transmissivity of the microwave/infrared dichroic beam combiner were then established.To verify the feasibility of the microwave/infrared dichroic beam combiner and the effectiveness of the analysis models,a sample of microwave/infrared dichroic beam combiner was fabricated by using laser directing writing technology on a Ge substrate,and the periods of metallic mesh under perpendicular and parallel polarizations were designed as 500 μm and 400 μm respectively to minish the difference of the microwave reflectivity at different polarizations.Moreover,the microwave reflectivity of the sample in 12-18 GHz was tested in a microwave anechoic chamber and the infrared transmissivity of the sample in 10-12 μm were measured by using a Fourier infrared spectrometer.The measurement and simulation results show that the microwave reflectivity of the sample is higher than-1.5 dB,and the infrared transmissivity is 83%.It can be concluded that the high transparent metallic mesh can be used as a novel microwave/infrared dichroic beam combiner in a dual-mode HWIL simulation system.