We discuss the advantages of a spline-based freeform shape optimization approach using the example of a multi-tapered coaxial balun connected to a spiral antenna. The underlying simulation model is given in terms of a recently proposed isogeometric integral equation formulation, which can be interpreted as a high-order generalization of the partial element equivalent circuit method. We demonstrate a significant improvement in the optimized design, i.e., a reduction in the magnitude of the scattering parameter over a wide frequency range.

翻译：本文以连接螺旋天线的多锥形同轴巴伦为例，探讨基于样条的自由曲面形状优化方法的优势。所采用的仿真模型基于近期提出的等几何积分方程公式，该公式可视为部分元等效电路法的高阶推广。我们证明了优化设计能带来显著改进，即在宽频范围内有效降低散射参数的幅值。