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首页> 外文会议>Terahertz, RF, millimeter, and submillimeter-wave technology and applications VI >Design and fabrication of an RF GRIN lens using 3D printing technology
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Design and fabrication of an RF GRIN lens using 3D printing technology

机译：使用3D打印技术设计和制造RF GRIN透镜

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Electromagnetic media and metamaterials have been explored in frequency regimes ranging from the acoustic to the visible domain over the past decade. A large part of the design, fabrication and prototyping of such materials has focused on planar structures and devices have been demonstrated primarily for certain propagation directions and/or defined polarization. Here, we present the design of a focusing GRadient INdex (GRIN) lens that operates at RF frequencies and is not polarization constrained. We compare the theoretical and experimental results from this lens designed to operate at X-band and fabricated using 3D printing technology to implement the effective medium. The lens with radially varying refractive index gradient was designed, optimized and analyzed by conducting full-wave simulations finite-element method based software. The permittivity was estimated by effective medium theory and calculated using HFSS®. The optimized design was used to fabricate the GRIN lens with isotropic, inhomogenous dielectric material. The refractive index was designed to match the theoretical results using mixing ratio of air/voids and a polymer. Further, we used the refractive index profile to predict the rays' trajectories and focus length to compare them to those predicted by the FEM simulations. The field distributions were also analyzed to compare performance of the theoretical design to the fabricated lens and were found to be in good agreement with each other.
机译：在过去的十年中，已经在从声域到可见域的频率范围内研究了电磁介质和超材料。这种材料的设计，制造和原型制作的大部分都集中在平面结构上，并且已经主要针对某些传播方向和/或定义的极化对器件进行了演示。在这里，我们介绍聚焦GRadient Index（GRIN）透镜的设计，该透镜在RF频率下工作且不受偏振限制。我们比较了设计用于X波段并使用3D打印技术制造以实现有效介质的这款镜头的理论和实验结果。通过进行基于有限元方法的全波仿真软件，设计，优化和分析了具有径向变化的折射率梯度的透镜。介电常数通过有效介质理论估算并使用HFSS®计算。经过优化的设计用于制造具有各向同性，不均匀介电材料的GRIN透镜。使用空气/空隙与聚合物的混合比，将折射率设计为与理论结果相匹配。此外，我们使用折射率分布来预测光线的轨迹和焦距，以将它们与FEM仿真所预测的轨迹进行比较。还分析了场分布，以将理论设计的性能与制成的镜片进行比较，发现彼此之间具有很好的一致性。

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