基于拓扑优化的微带天线奇异方向图设计

拓扑优化方法避免了结构的参数化扫描,直接优化材料排布,用于无源微波器件设计,可极大程度拓展设计解域。文中基于拓扑优化方法研究了微带天线的奇异辐射方向图设计。首先分析了具有奇异辐射方向图的伴随敏感度,其次构建了基于过渡边界条件的二维金属优化模型,再次提出了针对奇异辐射的多种目标场函数,分别实现了高增益定向指向波束、等幅双波束和任意方向线极化波束等奇异方向图。为验证算法有效性和准确性,最后加工并测试了具有高增益指向偏转方向图的微带天线,测试结果与拓扑优化结果吻合较好。此方法特别适合具有复杂目标的无源电磁器件设计。

Singular Pattern Design of Microstrip Antenna Based on Topology Optimization

The topology optimization method avoids the parameters scanning of the structure and directly optimizes the material arrangement, and is used in the design of passive microwave devices, which can greatly expand the design solution domain. In this paper, the singular radiation pattern microstrip antenna based on topology optimization method is studied. Firstly, the adjoint sensitivity with singular radiation patterns is analyzed, secondly, a two-dimensional metal optimization model based on transitional boundary conditions is constructed, and a variety of objective field functions for singular radiation are proposed again, such as high-gain beam directional deflection, equal-amplitude double-beams and arbitrary-direction linear polarizations. In order to verify the validity and accuracy of the algorithm, a microstrip antenna with a high-gain beam directional deflection pattern is fabricated and tested, and the test results are in good agreement with the topology optimization results. This method is particularly suitable for passive electromagnetic device design with complex targets.