A method is proposed to inhibit the surface wave propagation of microwave antenna.A two dimensional triangular photonic crystal based on transition metal oxide can be embedded into the microwave antenna and can improve performances of microwave antenna.The plane wave expansion method is used to calculate the relationship between bandgap width,center frequency,bandgap ratio and filling factors.The results show that the photonic crystal based on transition metal oxide owns a large absolute bandgap in the microwave band.The maximum absolute bandgap widths of these photonic crystals are all more than 0.06 ωa/2πc,and the maximum absolute bandgap width of CoO photonic crystal is 0.118 ωa/2πc,and the maximum bandgap rate can reach 24.255%.When the filling factors are increased,the center frequency of the band gap will decrease.