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Sponsored by IEEE Sensors Council (https://ieee-sensors.org/) Title: Polymer PMUT Array for High-Bandwidth Underwater Communications Author: Pieter Gijsenbergh, Alexandre Halbach, Yongbin Jeong, David Cheyns, Xavier Rottenberg, Veronique Rochus Affiliation: IMEC, Belgium Abstract: This paper demonstrates an 11-by-11 PMUT array used as a high-bandwidth receiver and transmitter developed for underwater communications. The array is composed of a randomized distribution of elements with three different diameters. While each individual element has its own unique resonance frequency – around 61, 66 or 73 kHz depending on its dimensions – and a bandwidth around 5 kHz in water, the combination of multiple sizes within the same array is shown to result in an average frequency response exhibiting a single resonance peak around 63 kHz with a fractional bandwidth up to 18% in water. A transmit efficiency of 1.6 Pa/V is achieved at 10 cm, combined with a receive sensitivity of 0.23 μV/Pa. IEEE Sensors Conferences (https://ieee-sensors.org/conferences/) IEEE Sensors Journal (https://ieee-sensors.org/sensors-jour...) IEEE Sensors Letters (https://ieee-sensors.org/sensors-lett...) IEEE Internet of Things Journal (https://ieee-iotj.org/) IEEE SENSORS conference proceedings (https://ieeexplore.ieee.org/xpl/conho...)