In this paper, four different types of BSTO tunable bandpass filters with ferroelectrics are proposed. The achievement of the tunability is based on the fact that the increase in the bias voltage leads to the reduction of the effective dielectric constant. Therefore, the center frequency shifts to the higher value with the higher bias voltage. The most frequently used and well-known ferroelectrics are STO and BSTO materials where the STO is mainly used below 100K while the BSTO is used at room temperature. The proposed technology seems very useful and promising for the development of the next-generation wireless communications.