A parametric array PMUT loudspeaker with high efficiency and wide flat bandwidth

Author

Been, K.H. ; Je, Y.U.B. ; Lee, H.S. ; Moon, W.K.

Author_Institution

Pohang Univ. of Sci. & Technol., Pohang, South Korea

fYear

2015

fDate

21-25 June 2015

Firstpage

2097

Lastpage

2100

Abstract

A previous study demonstrated that a piezoelectric micromachined ultrasonic transducer (PMUT) could be used to construct a PA loudspeaker, and developed a prototype. In this paper, we describe the performance of a PA loudspeaker fabricated using a more developed package. Our PA loudspeaker consists of an array of PMUTs with two resonance frequencies and uses an `out-of-phase´ driving technique, resulting in high power efficiency (up to 71%) and a wide flat radiation bandwidth. We also describe the characteristics of the PA sound, which depend on the method used to modulate the audible signal.

Keywords

loudspeakers; micromechanical devices; piezoelectric transducers; PA loudspeaker; out-of-phase driving technique; parametric array PMUT loudspeaker; piezoelectric micromachined ultrasonic transducer; Acoustics; Arrays; Bandwidth; Loudspeakers; Q-factor; Resonant frequency; Transducers; PMUT; broadband transducer; parametric array loudspeaker; piezoelectric transducer; ultrasonic transducer;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS), 2015 Transducers - 2015 18th International Conference on

Conference_Location

Anchorage, AK

Type

conf

DOI

10.1109/TRANSDUCERS.2015.7181371

Filename

7181371