This paper proposes a general synthesis method for inline mixed coupled quasi-elliptic bandpass filters based on resonators. Different from the conventional modeling with lumped and mixed inductive and capacitive coupling, the proposed mixedcoupling model here includes not only the coupling magnitudes, but also their paths’ phases inside the mixed coupling. According to the presented formulation, there exists one lower side transmission zero for the capacitive-dominant mixed coupling. However, there are two transmission zeros in the upper stopband for the inductive- dominant case, and these two transmission zeros can be analytically synthesized with different coupling path ratios.