In this paper, the PSO (Particle Swarm Optimization) algorithm is employed to design the broadband antenna matching networks. By choosing the appropriate topology and the objective function, opti- mizing the element of the networks, a satisfying effect can be achieved. Finally, two designed examples are sup- plied, and the results show that the performance of the matching networks is much better than that obtained from other methods. Thus, PSO Algorithm is an effective method for designing matching networks...