Characterization of Backing Layer Piezoelectric Ultrasonic Transducers for Underwater Communication. - Muhammad Syafeeq Harzick Mohd Subki; Khairul Azman Ahmad; Muhammad Khusairi Osman; Rozan Boudville; S. Z. Yahya; Mohamad Faizal Abdul Rahman; Zakaria Hussain (ICCSCE, 2021)