In this paper we investigate theoretically the scattering properties of a ternary solution made of two weakly charged cyclic polymers, of different chemical nature. These properties are studied through the total structure factor. The latter is computed using a generalized Zimm single-contact formula. The total structure factor versus the wave-vector is reported for several charge distributions of polyions. Our results are compared to those already observed for solutions of weakly charged linear polymer blends in solution. The main conclusion is that the weakly charged cyclic polymers scatter better than their linear homologues.