AbstractThis research aimed to analyze multiple underwater Piezoelectric Micro Ultrasonic Transducer (PMUT) models using several types of piezoelectric materials. The models were based on the basic structure of circular and square PMUT. Each structure was designed with and without a supporting layer of silicon dioxide. Due to limited literature and structured database of PMUT, the researchers use more time and cost through a try-and-error approach. This study analyzes the receiving and transmitting sensitivity of the PMUT. Circular and square PMUT, with and without supporting layers were designed and simulated using six different piezoelectric materials namely aluminum nitride, lithium niobate, lead zirconate titanate type 5A (PZT-5A), lead zirconate titanate type 5H (PZT-5H), quartz and zinc oxide. FEA simulation and modeling were carried out using the COMSOL Multiphysics 5.0 software. The models were analyzed based on structural and electro-acoustic parameters including thickness, radius, le.....