Tunable dual-band bandpass filter using piezoelectric transducer (PET)

Abstract

A piezoelectric transducer (PET)-controlled tunable dual-band bandpass filter (DBBPF) is introduced. A dielectric perturber is attached to the end of a PET cantilever beam and suspended above the designed DBBPF. By applying a DC bias voltage, the PET actuator vertically lifts up or pulls down the attached dielectric perturber. The height of the dielectric perturber from the DBBPF determines the effective dielectric constant, causing a variation of the filter's center frequency. The proposed DBBPF provides concurrent dual passband tuning operation for multiband wireless systems.