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This paper reports a method to design highly coupled piezoelectric energyharvesters with frequency tuning capabilities using nonlinear electricaltechniques. A cantilever beam with two PMN-PT patches has been optimized thanksto both analytical modelling and Finite Element Methods (FEM). The builtprototype exhibits a strong electromechanical coupling (k${}^2$=17.6%) and afigure of merit (km${}^2$Q=12.4) which allow a bandwidth corresponding to 22%of the resonant frequency value.

Modelling and design of highly coupled piezoelectric energy harvesters for broadband applications