Presently, there is a critical need for millimeter wave devices, which operate in the frequency range from about 30GHz to 100GHz. This need for broadband telecommunication capabilities will mandate the use of mm-wave frequencies in next-generation satellite. One importante strategy for the above described frequency extension is the use of BaFe₁₂O₁₉ films (BaM). The goal of our work is the characterization of BaM films over frequency range of 0.4 to 65GHz. The theoretical method adopted to determine the different elements of permeability tensor use the scathring parameters S and Maxwell equations. Polder's model, consider ferrite in its saturated state. The BaM films shows the presence of a gyroresonance phenomenon and the resonance frequency reaches a very high value of about 45GHz. The non-reciprocal effect is greater than 10dB and the line width is very wide. BaM ferrite has a high value of uniaxial anisotropy, its saturation magnetization is about 500mT and the remnant magnetization reached 270mT. The coercive field value ranges between 200KA/m and 330KA/m. Ä°t may be useful when the magnetic device is to function at high frequency.