Tunable Ferroelectric Acoustic Resonators in Monolithic Thin-Film Barium Titanate
New barium titanate (BTO) devices on silicon achieve 8% coupling and frequency tuning for reconfigurable RF filters.
Deep Dive
A team led by Ian Anderson and Ruochen Lu developed monolithic thin-film barium titanate (BTO) acoustic resonators. The devices, fabricated on silicon, operate at 300 MHz and 700 MHz with up to 8% electromechanical coupling. By applying a DC bias, engineers can electrically tune the resonant frequency and enhance the quality factor. This enables compact, low-loss, and reconfigurable RF filters for future wireless communication systems.
Why It Matters
This paves the way for more efficient, tunable front-end filters in smartphones and 5G/6G base stations, reducing hardware complexity.