Design of Multi-Band Transmission Line Transformer using Particle Swarm Optimization

The design of N-section matching transformer operating at N arbitrary frequencies using the particle swarm optimization (PSO) method is demonstrated. Although analytical methods based on standard transmission line theory can be used in such designs, however, the analysis becomes cumbersome if N exceeds three, and numerical methods should be used to solve the resulting nonlinear equations. The design using the PSO, however, is much easier, and gives the same results as the analytical methods. Different examples are presented and compared with published literature