A $Ba_{2}Co_{2-x}Zn_{x}Fe_{12}O_{22}(x;=;0.0~2.0,;Co_{2-x}Zn_{x}Y)$ powder was prepared by a oxidation--coprecipitation method and sintered at $1150~1250^{circ}C$ for 4 hours. The microstructures and magnetic properties(saturation magnetization, Curie temperature), complex permeability of sintered body were measured As increasing Zn content from x = 0 to 2.0 in $Co_{2-x}Zn_{x}Y$, the real value of complex permeased from 7 GHz to 1 GHz. Because of resonance in few GHz range, Y-type hexagonal ferrite is rmre applicalble than spinel ferrite in high frequency range, and more research would be necessary to find the mechanism of the second resonance observed in higher frequency.