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本文给出了既有双稳态特性又具有天线功能的多功能复合材料层板设计与分析方法。基于非线性层板理论和Rayleigh-Ritz法,建立了双稳态混杂层板构型预报理论模型,并通过有限元计算和实验进行了验证。研究了薄膜天线混杂非对称双稳态复合材料层板的临界载荷及电磁性能,分析了铺层方式对双稳态混杂层板稳定构型、临界载荷和电磁性能的影响。结果表明:双稳态混杂层板通过转变其稳定构型实现天线主辐射方向在俯仰面内偏转30°,实现方向图可重构,扩大天线波束的扫描范围。铺层方式对层板构型和反射系数影响较大,当天线辐射层铺设在层板表面时,聚酰亚胺薄膜厚度大于0.2 mm时,其双稳态特性消失,没有出现分叉现象,且其中心频率会左移大约0.2 GHz。
In this paper, a multi-functional composite laminate design and analysis method with both bistable and antenna functions is presented. Based on the nonlinear laminar theory and the Rayleigh-Ritz method, a theoretical model of the bistable hybrid laminar configuration prediction is established and verified by finite element analysis and experiments. The critical load and electromagnetic properties of thin film antenna hybrid asymmetric bistable composite laminates were studied. The influence of lay-up on stability configuration, critical load and electromagnetic properties of bistable hybrid laminates was analyzed. The results show that the main radiation direction of the bistable hybrid laminates can be deflected by 30 ° in the pitch plane by changing its stable configuration, and the reconstruction of the pattern can be made and the scanning range of the antenna beam can be enlarged. When the thickness of the polyimide film is greater than 0.2 mm, the bistable characteristics disappear and no bifurcation occurs when the antenna radiation layer is laid on the surface of the laminate. And its center frequency shifts left by about 0.2 GHz.