IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control · 2009 · 10 citations · 13 references
Natural SciencesElectrical EngineeringMaterials ScienceCeramic MaterialsCeramicsMicrowave EngineeringCeramic TechnologyDielectric CeramicsDielectricsElectrical Properties Of CeramicsMicrowave MaterialsBarium Titanate CeramicsCapacitanceCeramic CapacitorsCeramic DielectricsParasitic CapacitanceParasitic Capacitance ReductionTunable CapacitorsTuning
This paper deals with the microwave study of coplanar tunable capacitors using Mn-doped Ba(0.6)Sr(0.4)TiO(3) ceramics. These ceramics are developed to improve performance at microwave frequencies (i.e., compromise between tuning capabilities and insertion losses). Interdigitated capacitors were first fabricated on thick Mn-doped BST ceramics. The capacitors showed reduced tuning factor because of a parasitic capacitance between the contact pads. The use of Mn-doped BST/ SiO(2) bilayers led to a significant enhancement of the capacitor performance (57% of agility under 200 V at 1 GHz).
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Frédéric Dumas-Bouchiat, Corinne Champeaux, A. Catherinot et al. · Applied Physics Letters · 2007 · 120 citations