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Low cost planar ferroelectric thick film varactors based on Barium Strontium Titanate (BST) are realized and their nonlinear behavior with varying DC bias is investigated. A model for the capacitance tunability is utilized for nonlinear simulations and compared to measurements. The model based on static measurement of the varactor's capacity is extended by the results from measurements with pulsed...
Tunable coplanar interdigital capacitors (IDC) based on Barium-Strontium-Titanate (BST) thick-films are evaluated for their suitability for high power applications, such as tunable impedance matching networks of power amplifiers. The design process has been reviewed with respect to the nonlinearity of the varactors. Various devices have been fabricated and their performance has been verified by measurements...
Scaled varactors on a Barium-Strontium-Titanate (BST) thick-film are produced and characterized. The tunability of the scaled varactors is measured at up to 12.5 V/mum effective tuning field-strength in the planar varactors' air gap. To increase the effective tuning field-strength without breakdown and therefore to increase the tunability of the varactor the planar structure is covered with Parylene...
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