Table 1.

Summary of several piezoelectric wind energy harvesters.

Reference	Size	Wind Speed (m/s)	Maximum Power (µW)	Power Density (µW/cm3)
Tan [18]	Cantilever: 76.7 mm × 12.7 mm × 2.2 mm	6.7	155	72.3
Bryant [15]	Cantilever: 254 mm × 25.4 mm × 0.381 mm with two PZT unimorph of 46 mm × 20.6 mm × 0.254 mm Fin: 29.7 × 136 mm	7.9	2200	748 a
Li [10]	Cantilever: 41 mm × 16 mm × 0.205 mm	8	260	1933
Sirohi [25]	Cantilever: 161 mm × 38 mm × 0.636 mm (2 pieces) Fin: length 251 mm, triangular section with side length of 40 mm Total: 160 mm × 250 mm	5.2	53,000	6811 a
Yang [26]	Cantilever: 150 mm × 30 mm × 0.6 mm with two piezoelectric sheet of 61 mm × 35 mm × 0.5 mm Fin: 150 mm × 40 mm × 40mm	8	8400	1737 a
Liu [27]	Cantilever: 3.3 mm × 2 mm × 0.4 mm (MEMS)	15.6	0.0387	14.7
He [1]	Cantilever: 10 mm × 8 mm × 0.51 mm (MEMS)	16.3	2.27	55.6
Weinstein [17]	Cantilever: 28.6 mm × 6.3 mm × 0.381 mm Fin: not given Blunt body: diameter 25 mm Total: 225 mm × 110 mm	5	3000	43,701 a
Clair [21]	Cantilever: aluminum sheet of 58 mm × 16 mm × 0.3 mm with a PZT unimorph of 12 mm × 13 mm × 0.127mm Cavity: diameter of 76.2 mm, volume of 24,000 mm3	12.5	800	2683 a (33.3 b)
Ji [22]	Cantilever: 200 mm × 15 mm × 0.8 mm with an attached piezoelectric sheet of 20 mm × 15 mm × 0.2 mm Cavity: inlet of 30 mm × 20 mm, the length is not given, which should be a little longer than 200 mm.	9.8	4500	1829 a (~37.5 b)
This work	Cantilever: a PZT bimorph of 38 mm × 6.4 mm × 0.38 mm and a FET sheet of 20 mm × 6.4 mm × 0.25 mm Cavity: 62 mm × 19.6 mm × 10 mm	11.2	1590	12,780 a (130.8 b)

^a Calculated according to the volume of the cantilever; ^b Calculated according to the volume of the cavity.