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Publications (7/7 displayed)
- 2022Growth-microstructure-thermal property relations in AlN thin filmscitations
- 2019Mechanical strength of cold-sintered zinc oxide under biaxial bendingcitations
- 2006Discrete Barium Strontium Titanate (BST) Thin-Film Interdigital Varactors on Alumina: Design, Fabrication, Characterization, and Applicationscitations
- 2006Voltage Controlled GaN-on-Si HFET Power Oscillator Using Thin-Film Ferroelectric Varactor Tuningcitations
- 2006Noise characteristics of an oscillator with a barium strontium titanate (BST) varactorcitations
- 2005A tunable combline bandpass filter using barium strontium titanate interdigital varactors on an alumina substratecitations
- 2004Microwave properties of bst thin film interdigital capacitors on low cost alumina substrates
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document
A tunable combline bandpass filter using barium strontium titanate interdigital varactors on an alumina substrate
Abstract
Barium strontium titanate (BST) has a field-dependent permittivity that enables it to be used as a dielectric in a voltage-tunable capacitor or varactor. A tunable combline bandpass filter was designed and characterized using BST varactors fabricated on a polycrystalline alumina substrate with copper metallization and is 14 mm /spl times/ 14 mm in size. The center frequency of the filter varies from 1.6 to 2.0 GHz with the application of 200 V tuning voltage. A 25% tuning range was achieved using tuning field strength of 300 kV/cm. The zero bias insertion loss was 6.6 dB and this decreased to 4.3 dB at the high bias state. The return loss was better than 10 dB.