含有频变耦合系数的交叉耦合滤波器优化设计

交叉耦合滤波器由于其小体积和高性能等优点被广泛应用于各种微波系统中。但阶数固定的交叉耦合滤波器能够实现有限传输零点的个数受限。针对该问题，给出一种含有频变耦合系数的交叉耦合滤波器快速优化综合技术。含有频变耦合系数的交叉耦合滤波器在阶数相同的情况下能够实现更多的有限传输零点。首先利用全局优化算法遗传算法进行初步搜索，若满足指标则停止；否则将其结果作为局部优化算法Solvopt的初值进行搜索即可获得指定拓扑结构的耦合矩阵。通过3个优化综合实例证明了该方法的有效性。

Optimization Synthesis Technique for Cross-Coupled Filter with Frequency Dependent Couplings

Cross-coupled filters with small volume and the high performance are applied widely in various microwave systems. However, the number of finite transmission zeros for cross-coupled filters is limited. However, a cross-coupled filter with frequency dependent couplings can realize more finite transmission zeros than the traditional cross-coupled filters when the filter order is the same. A novel fast filter synthesis technique with frequency dependent couplings is presented in this paper. The global optimization algorithm Genetic Algorithm (GA) searches the optimal solution. If the solution meets the requirement, stop the optimization. Otherwise, the solution of GA as the initial value for Solvopt optimization to search the optimal solution. Three numerical examples show the validity of the synthesis technique in this paper.