Measuring devices and main expressions for the procedure of measurements of the dielectric properties of ferroelectric (FE) films at microwave (MW) are presented. The results of MW measurements of SrTiO3 (STO) and Ba0.5Sr0.5TiO3 (BSTO) films demonstrate the possibilities of this procedure. Formulas required to choose the most suitable FE materials and to design the FE microwave devices (filters, phase shifters) are presented.