The objective of the work is to point on an important part in nowadays electronic domain and that is, the characterization of materials; a necessary process before integrating them in electronic devices such as, tunable filters and tunable phase shifters. Our work concern studying the electrical properties of dielectrics and precisely those of thin ferroelectric materials and that, on a broad frequency band in a first step before their dynamic behavior study (response under application of external electric field). Thus, we can contribute in the realization of tunable circuits at high frequencies starting from such layers.