Optimization of SPL and THD Performance of Microspeakers Considering Coupling Effects

Mobile phones have become more versatile as a result of advances in mobile communication technology. The latest mobile phones are able to provide dazzling multimedia entertainment with portability. A microspeaker has become a generic electromechanical part of mobile phones that enables multimedia features. Therefore, the performance of the microspeaker must be improved in line with the increasing demand for high-quality sound produced by the phone. Sound pressure level (SPL) and total harmonic distortion (THD) are the two most common evaluation criteria that are used to quantify the performance of the microspeaker. Therefore, it is necessary to implement an analysis procedure that predicts and quantifies the SPL and THD characteristics. This manuscript suggests a multiphysics analysis procedure that comprehensively considers electromagnetic, mechanical, and acoustic coupling effects. The experimental results confirm the validity of the proposed analysis procedure.