ON A DEVELOPMENT POSSIBILITY OF A TUNABLE MICROWAVE PASSBAND FILTER BASED ON DIELECTRIC RESONATOR WITH HIGH T-C FILM

Measurements of temperature dependence of ''YBa2Cu3O7-X thin film on S rTio(3) substrate'' structure effective impedance have been performed in 8-mm wave band by means of quasioptical dielectric resonator with w hyspering gallery modes. This dependence appeared to be a series of qu asiperiodical oscillation peaks of high steepness. Experiments on inve stigation of external electric field impact on parameters of the reson ator loaded by the structure were carried out. It was found that elect ric field up to 3 kV/cm leads to a shift of the effective impedance te mperature dependence to lower temperature and doesn't impact on the fo rm of the dependence. Herewith the field of 2.5 kV/cm causes a shift o f the resonator frequency by 108 MHz with negligible reduction of the loaded quality factor Q(L) (less than in 1.5 times). Operating frequen cy was 35 GI-Sz and loaded quality was about 10(3). A proposal about p ossibility of tunable passband filter design and ways of retuning band width enhancment are discussed.