In this manuscript, we numerically examined the dispersion characteristics of two designed microstructure fibers by using the plane wave expansion method. In the basic structure, air holes are arranged in a square lattice. In the first structure, the third ring in the cladding is formed by small diameter circular air-holes. In the second fiber, the third ring is formed by large diameter circular air-holes and in both fibers, the first ring around the germanium doped core is formed by elliptical air-holes filled with ethanol. By manipulating the third ring air-holes diameter, we obtained flat negative dispersion or dispersion compensation property.