Dual-band electrically small Huygens rectenna for microwave wireless power transfer

This paper proposed an electrically small, high-efficiency, dual-band Huygens rectenna for microwave wireless power transfer (MWPT), which innovatively combined a bandwidth-enhanced electrically small dual-band Huygens antenna with a highly efficient rectifier. The antenna consists of two sets of near-field resonant parasitic (NFRP) elements with identical geometry but different dimensions. The antenna achieves electrically small([email protected] GHz) and low profile(0.02λ₀). A λ/4 dual-band coupler is employed to accomplish impedance matching between the dual-band Huygens antenna and the high-efficiency rectifier, thereby combining them into an electrically small, highly efficient dual-band rectenna. The proposed rectenna achieves peak power conversion efficiency(PCE) of 74.4% at 0.9 GHz and 63.9% at 2.5 GHz over a wide input power range from -3 dBm to 30 dBm. Overcoming the application limitations of previous single-band Huygens rectennas, this work provided a compact and high-efficiency solution for MWPT.