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《Acta Electronica Sinica》 2017-08
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The Implementation and Design of Piezoelectric Transducer-Tuned Dielectric Filter

CAO Liang-zu;YIN Li-xia;School of Electronic and Optical Engineering,Nanjing University of Science and Technology;School of Mechanical and Electrical Engineering,Jingdezhen Ceramic Institute;  
In order to solve the problem of lowpower capacity and high insertion loss existing in varactor-tuned narrowfilters,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 showthat 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 showthat center frequencies vary from 4. 155 GHz to 4. 205 GHz when bias voltages are applied from 0V to 50 V with 3d B bandwidth of 37 ~ 40 MHz.
【Fund】: 江西省自然科学基金(No.20151BAB207014)
【CateGory Index】: TN713
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