A Dual Circularly Polarized Ultrawideband Rectenna with High Efficiency for Wireless Energy Harvesting
DOI:
https://doi.org/10.13052/2024.ACES.J.390311Keywords:
Coplanar waveguide (CPW), dual circularly polarized antenna, ultra-wideband rectifier, wireless energy harvesting (WEH)Abstract
This paper presents an ultrawideband dual circularly polarized (CP) rectenna for wireless energy harvesting (WEH) applications. It is mainly composed of a dual CP antenna and an ultrawideband rectifier. The receiving antenna is fed by a coplanar waveguide (CPW) and it has two input ports. The proposed ultrawideband rectifier has a two-cascaded voltage doubler configuration. This configuration means the proposed rectifier’s input impedance has less sensitivity to frequency variation. Thus, a wide bandwidth can be achieved. For validation, a prototype is designed, fabricated and measured. The measured results show that the axial ratio (AR) bandwidth of the proposed rectenna is from 1.35 to 3.10 GHz (for AR <3 dB). In this frequency range, the rectenna’s power conversion efficiency (PCE) is higher than 55%. These results indicate that the proposed rectenna is highly efficient and suitable for wideband high-efficiency WEH systems.
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