An Mm-Wave Trilayer AlN/ScAlN/AlN Higher Order Mode FBAR
IEEE Microwave and Wireless Technology Letters(2023)
Abstract
Modern wireless communication systems are increasingly complex with greater functionality and impose new challenges on the radio frequency (RF) front-end design. One of the major challenges involves filtering beyond the sub-6-GHz regime with increased fractional bandwidth (FBW). To the best of our knowledge, this work presents the first demonstration of a film bulk acoustic wave resonator (FBAR) with a composite ferroelectric/piezoelectric transduction layer (consisting of AlN–Sc0.3Al0.7N–AlN) that is capable of selectively operating at higher order resonant modes without compromising $k_{t}^{2}$ for applications in the millimeter wave (mm-Wave) spectrum. The resonator exhibits a fundamental mode at GHz with $k_{t}^{2}$ of 5.2% but can switch to a higher order response at 31 GHz by reversing the polarization direction in the ScAlN layer ( $k_{t}^{2}$ of 5.5%).
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Key words
Aluminum nitride (AlN),electromechanical coupling coefficient (kt2),microwave acoustics,scandium aluminum nitride (ScxAl(1-x)N),thin film bulk acoustic wave resonators (FBAR)
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