This paper presents a new scheme of a tri-band Gysel power divider. A tri-band transmission line transformer and parallel short-and open-ended stub resonators are applied to a dual-band power divider for tri-band application. Exact equations are derived based on even- and odd-mode analysis. There is a good agreement between simulation and experimental results. In addition to good insertion loss, return loss, and isolation, it also has the advantage of high power-handling capability over the Wilkinson power divider.