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20 GHz tunable filter based on ferroelectric (Ba,Sr)TiO3 film varactors

20 GHz tunable filter based on ferroelectric (Ba,Sr)TiO3 film varactors

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The tunability and dielectric losses of ferroelectric (Ba,Sr)TiO3 film varactors were measured under DC voltage at microwave frequencies (~20 GHz). A new microwave two-pole tunable waveguide filter containing four ferroelectric (Ba,Sr)TiO3 film varactors was designed and tested. The frequency tuning of the filter results from the variation in capacitance of ferroelectric varactors with DC controlling voltage.

Inspec keywords: varactors; ferroelectric thin films; waveguide filters; barium compounds; microwave filters; dielectric losses; circuit tuning; strontium compounds

Other keywords: microwave frequencies; ferroelectric film varactors; two-pole waveguide filter; (BaSr)TiO3; DC voltage; 20 GHz; capacitance variation; tunable filter; dielectric losses; DC controlling voltage; frequency tuning

Subjects: Capacitors; Passive filters and other passive networks; Waveguide and microwave transmission line components

References

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      • D. Galt , J.C. Price , J.A. Beail , R.H. Ono . Ferroelectric thin film characterization using superconducting microstrip resonators. IEEE Trans. Appl. Supercond. , 2575 - 2578
    2. 2)
      • A.B. Kozyrev . Procedure of microwave investigations of ferroelectric films and tunable microwave devices based on ferroelectric films. Microelectron. Eng. , 257 - 260
    3. 3)
      • F.A. Miranda , C.H. Muller , G.A. Koepf , R.M. Yandrofski . Electrical response of ferroelectric/superconducting/dielectric BaxSr1-xTiO3/YBa2Cu3O7–δ/LaAlO3 thin-film multilayer structures. Supercond. Sci. Technol. , 755 - 763
    4. 4)
      • G.L. Matthaei , L. Young , E.M.T. Jones . (1980) Microwave filters, impedance-matching networks, and coupling structures.
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