A Fluidics-Based Double Flexural Membrane Piezoelectric Micromachined Ultrasonic Transducer (PMUT) for Wide-Bandwidth Underwater Acoustic Applications. - Khairul Azman Ahmad; Mohamad Faizal Abd Rahman; Khairu Anuar Mohamed Zain; Muhammad Naim Haron; Asrulnizam Abd Manaf (Sensors, 2021)