A study of circular piezoelectric micro speakers is presented for applications in the audio frequency range, including values for\r\nimpedance, admittance, noise figures, transducer gain, and acoustic frequency responses. The micro speakers were modelled based\r\non piezoelectric micro ultrasonic transducer (pMUT) design techniques and principles. In order to reach the audio frequency\r\nrange, transducer radii were increased to the order of one centimetre, whilst piezoelectric layer thicknesses ranged the order of\r\nseveral �µm. The micro actuators presented might be used for a variety of electroacoustic applications including noise control,\r\nhearing aids, earphones, sonar, and medical diagnostic ultrasound. This work main contribution is the characterization of the\r\ndesign space and transducer performance as a function of transducer radius, piezoelectric layer thickness, and frequency range,\r\nlooking towards an optimized fabrication process.
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