Novel design method of a multi-section transmission-line transformer using genetic algorithm techniques

A novel design method of a multi-section transmission-line transformer (TLT) for simultaneously matching multi-arbitrary frequencies and an arbitrary load is developed, based on an ideal transmission-line circuit mode and optimization design using genetic - algorithm techniques. Optimum design equations of the TLT are derived, and the related algorithm and procedure are described. In order to test and verify validity of the method, an three-section transmission-line transformer (TLT) for matching three arbitrary frequencies and an arbitrary load, is designed and analyzed by letting f(1)= 0.9GHz, f(2)=1.8GHz, and f(3) =2.4GHz with matching Z(0) = 50 to Z(L) = 30 Omega, 75 Omega, and 100 Omega, respectively. And excellent agreement between the numerical results and the result presented by Michai[8] is shown. The new design method avoid completed and closed - form design equations. Further, by this method, a four-section transmission-line transformer (TLT) for simultaneously matching four operating frequencies, i.e., 0.9GHz, 1.8GHz, 2.4GHz, and 3.7GHz, at different transforming ratio values, is designed and simulated effectively.