Electrically tunable bandpass filters

An adjustable band-pass filter, comprising: At least resonator, wherein the resonator with a resonance frequency reactance; With a dielectric constant micro film, wherein the double-face of the dielectric the values to form of an electric field according to; And electric field with device, with different strength relatively constant electric field. The micro film and resonator electrically coupled, resonator's that the resonance frequency and ends of the reactance and resonator is section are fixed by the micro film coefficients of dielectric consumption. Midspan and electric field with, wherein a plastic constant electric field the micro film, wherein that the resonance frequency and ends of resonator is a range of the plastic constant electric field strength the function.