TUNABLE 4-POLE PIEZOELECTRIC FILTER BASED ON TWO DIELECTRIC RESONATORS

ABSTRACT

A frequency tuneable microwave filter based on two dual mode dielectric resonators has been developed. Tuning of the filter was realised by using metal plates located over the dielectric resonators and moved along the resonator axis by piezoelectric bimorphs. The main parameters of the filter were: central frequency in the middle of the range of tuning −2.9 GHz, bandwidth for 1dB level ≈0.5%, range of tuning ≈140 MHz. The insertion losses in the whole tuning range were below ≈q2 dB.

ACKNOWLEDGMENTS

This work was financial supported by Framework V Programme (Project GRD1-2001-40547 “TUF”) and Engineering and Physical Sciences Research Council (EPSRC).