Multi-band energy harvesting antenna based on PVDF piezoelectric material

In this paper, a compact dual-band and coplanar waveguide feeding antenna based on PVDF (polyvinylidene fluoride) piezoelectric film is proposed, which is suitable for Wi-Max and C-band. Designed by a pair of L-shaped coplanar waveguide metal patches on a PVDF film, the proposed antenna covers a bandwidth range of 2.92-3.28 GHz and 6.33-7.71 GHz. The gain is 2.05 dB at 3.05 GHz and 4.88 dB at 6.75 GHz. It has a compact size of 50×50 mm
²
with the piezoelectric substrate thickness of 0.1 mm and dielectric constant of 9.5. The antenna exhibits omnidirectional radiation characteristics in the lower frequency band, and good directional radiation characteristics in the higher frequency band. This piezoelectric antenna can be used for the RF and vibration hybrid energy harvesting system.