考虑互耦的改进型Vivaldi天线阵列优化设计

设计了一种改进的Vivaldi天线,采用基于指数和椭圆的混合渐变线方法,实现了天线的小型化设计,同时具有超宽带的性能。将该天线沿x轴组成了一个8元直线排列的天线阵列,采用有源单元方向图方法来考虑天线单元间的互耦,得到的阵列方向图与全波模拟结果吻合很好。与微分进化-连续蚁群优化算法的混合算法相结合,通过调整单元的激励幅度,实现了方向图的综合。与切比雪夫综合方法相比,可以获得更低的副瓣电平,同时减小了全波模拟的计算次数,节省了优化时间。

Optimization Design of Modified Vivaldi Antenna Array that Including the Mutual Coupling Effects

A modified Vivaldi antenna is proposed in this paper. A tapered line comprising exponential and elliptic sections is applied to achieve the ultra-wideband (UWB) performance and miniaturization design for the Vivaldi antenna. A 8-element Vivaldi linear antenna array is placed on the x-axis. The active element pattern (AEP) method is used to solve the array radiation problems. The AEP method is very effective because it includes the effects of mutual coupling rigorously. The array patterns calculated by this method are in good agreement with the results by the full-wave simulation. This array is optimized by a hybrid optimization algorithm based on differential evolution strategy (DES) and continuous ant colony optimization (CACO) algorithm. The excitation amplitudes are as the optimization variables. Compared with the Chebyshev antenna array, the side lobe level (SLL) obtained by the optimization algorithm is lower. The number of full-wave simulation is decreased, and the optimization time is saved.