Tri-band Wilkinson power divider using resonators

This paper presents a method by using resonators to design a tri-band Wilkinson power divider. We employ the conventional Wilkinson power divider structure working at higher frequency f₁ (2.5GHz) as the basic design. In order to achieve good performance of the other two frequencies, we use an open-circuit stub connected with a resonator for the middle frequency f₂ (1.5GHz) and cascade another one with the same idea for the lower frequency f₃ (1GHz). By applying this kind of frequency control element (stubs with resonators) in a π -shaped structure and putting them inside the conventional Wilkinson divider, topology keeps the compactness. Applications of three distinctive bands for Wilkinson power divider are analyzed by employing 2.5D EM simulator and these results are in agreement with measured ones.