KuKa双频宽带一体化天线设计

KuKa Dual-Band Broadband Integrated Antenna Design

摘要: 为适应宽带通信的需要，如低轨宽带卫星和高轨遥测卫星，针对传统环焦天线在宽频带、低旁瓣和多频段应用中的局限性，本文提出了一种基于多目标优化算法与非均匀有理B样条(NURBS)曲面参数化的反射面环焦天线赋形设计方法。通过结合几何光学法(GO)和物理光学法(PO)建立初始模型，引入粒子群优化(PSO)算法优化口面场分布，并采用NURBS曲面实现反射面二次赋形。设计KuKa双频宽带一体化环焦天线仿真与实验，结果表明该方法可显著提升天线效率(≥75%)、降低第一旁瓣电平(≤−16 dB)，并实现Ka/Ku双频段覆盖(驻波比 ≤ 1.45)，验证了设计方法的有效性。

Abstract: To meet the needs of broadband communication, such as low-orbit broadband satellite and high-orbit remote sensing satellite, for the limitations of traditional circularly focused in wideband, low side lobe and multi-band applications, this paper proposes a circularly focused antenna pattern design method based on a multi-objective optimization algorithm and non-uniform B-spline (NURBS) surface parameterization. By combining geometric optics (GO) and physical optics (PO) methods to establish an initial model, introducing the particle optimization (PSO) algorithm to optimize the far-field distribution, and using NURBS surface to achieve secondary shading of the reflective surface. The simulation and experimental results of the KuKa dual-band broadband integrated circular focusing antenna show that this method can significantly improve the antenna efficiency (≥75%), reduce the first side lobe level (≤−16 dB), and achieve Ka/Ku dual-band coverage (VSWR ≤ 1.45), which verifies the effectiveness of the design method.