Gonzalez-Hernandez, JuanJuanGonzalez-HernandezBleakley, Chris J.Chris J.Bleakley2015-09-252015-09-252010 IEEE2011-05IEEE Sensors Journalhttp://hdl.handle.net/10197/7118This paper presents a low-cost, wideband ultrasonic transmitter for in-air ultrasonic applications based on a conventional narrowband piezoceramic transducer with a LR circuit modification. An analytic method for calculation of the optimum circuit parameters for bandwidth expansion of the ceramic ultrasonic transmitter is described, together with experimental data proving the viability of the method. A low cost wideband ultrasonic receiver array is also presented. The results of the first characterization of MEMs microphones in the ultrasonic band and their use in a sensor array for ultrasonic Array Signal Processing applications is presented. The study presents examples of prototype performance in ultrasonic indoor applications.en(c) 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other worksArray signal processingMicroelectromechanical systems (MEMS)PiezoelectricUltrasonicJournal Article1151284129210.1109/JSEN.2010.20845682015-09-04https://creativecommons.org/licenses/by-nc-nd/3.0/ie/