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|Title:||Study Of Barium Strontium Titanate Varactor At High Frequency||Authors:||CHENG WEINING||Keywords:||ferroelectric, BST, varactor, PLD, dielectric constant, bottom electrode||Issue Date:||7-Feb-2008||Citation:||CHENG WEINING (2008-02-07). Study Of Barium Strontium Titanate Varactor At High Frequency. ScholarBank@NUS Repository.||Abstract:||Ferroelectric materials and applications have attracted great research interests in the past few decades.Ba0.5Sr0.5TiO3 (BST) is chosen to fabricate a varactor in a parallel plate structure. Three parallel plate varactors with different electrodes are fabricated by Pulse Laser Deposition (PLD) and ion-sputtering.Dielectric constant and loss versus frequency under different applied bias are characterized. The dielectric dispersion as a function of frequency is attributed to the increase of the effective separation length between top and bottom electrodes which is arising from the voltage drop across the bottom electrode in a varactor. The main source of the varactor loss is due to the resistance of bottom electrode. Varactors using Pt or Au as a bottom electrode have relatively small loss factor and frequency independent dielectric constant, and hence they are suitable to be used in a varactor for high frequency microwave application.||URI:||http://scholarbank.nus.edu.sg/handle/10635/13084|
|Appears in Collections:||Master's Theses (Open)|
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