A Compact and High-Efficiency Design of Triple-Band Rectifier for Wireless Power Transfer

This paper proposes a novel method for the design of arbitrary tri-band rectifiers. This method proposes a novel multiband impedance matching network (IMN) consisting of three Transmission Lines (TLINs), which can realise the matching of source and complex impedance matching in any three bands. For the first time, a network is proposed that realises the second harmonic suppression in three bands using only three TLINs. The Harmonic Suppression Network (HSN) is independent of other parts, which reduces the interaction between TLINs and simplifies the derivation process. For demonstration, the three bands are set to 2.45, 3.5 and 5.8 GHz in the theoretical analysis of closed-form equations. The measured results show that the maximum Power Conversion Efficiencies (PCEs) are 75.4%, 71.2%, and 80.9% at a load of 200 Ω, respectively. This approach to designing compact and efficient tri-band rectifiers has great potential for wireless power transfer applications.