Traditional piezoelectric vibration generator has the defects including single natural frequency

narrow work bandwidth and low energy harvesting efficiency

which is unable to meet the wideband and high-power output requirements of wireless sensor in a special environment. A neat 3×

n

element energy harvester array exploiting multi-vibration modes separation technique

has been designed

fabricated

and characterized. The vibration modes of the 3×

n

generators have been analyzed by COMSOL software. A considerable wideband of 15.6 Hz in simulation and 13.8 Hz in experiment with 3×5 array energy

harvester has been gained in a very low frequency range (below 50 Hz). Experimental results showed that the adjusted 3×5 array harvester could generate the output power of about 2.12 mW at an 11 Hz resonant frequency with the optimum load resistance 350 kΩ. Meanwhile

the half-power (1.05 mW) bandwidth could reach up to 15.3 Hz. The bandwidth and the output power of the array energy harvesting system were significantly improved by exploiting the proposed vibration modes separation technique

in which excellent output performance makes it a distinct advantage in multi-source and broadband vibration environments.