In order to solve the problem of low power capacity and high insertion loss existing in varactor-tuned narrow filters

a tunable dielectric filter using piezoelectric transducers as tuning elements has been developed.The tuning of a dielectric resonator tuned by a piezoelectric transducer was analyzed

the control of coupling coefficient and external quality factor was discussed.The simulation results show that the coupling coefficient and external quality factor hardly varies with the tuning frequencies.A two-pole electrically tunable dielectric filter is designed and optimized by using HFSS software.The proposed filter was made of high Q-value dielectric resonators.Based on the results of ANSYS analysis

the effective measure of improving the tunability is suggested.The measured results show that center frequencies vary from 4.155GHz to 4.205GHz when bias voltages are applied from 0V to 50V with 3dB bandwidth of 37~40MHz.