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Low loss highly tunable microwave material can be fabricated using dielectric laminate structure in which effective dielectric constant εef is efficiently controlled. The proposed combined structure usually consists of two dielectric parts with an air gap between them. This gap has to be arranged in such a way that provides the largest perturbation in the electromagnetic filed. By means of fast piezo electric mini-actuator, the size of the air gap is changed. As a result, the εef of given structure strongly varies that is used for device control. Wideband low loss waveguide phase shifters, highly tunable dielectric resonators, and based on them 20%-tunable filter are realized experimentally.