2004(4):65-67.
Abstract:
When there is a certain restriction to the total length of impedance transformer, the characteristic impedance of conventional commensurate broadband matching networks would exceed feasible range. For nonuniform broadband impedance transformers, the design has greater flexibility because the constraint that all elements have the same electrical length is removed. In order to obtain optimal parameters of the transmission line networks, improved genetic algorithm has been adopted to optimize design, and dynamic penalty function is introduced to deal with the fitness function. The simulation result shows that impedance transformers designed by this method have better performance than those designed by conventional methods in most cases.