A Dual-Band Dual-Sense Circularly Polarized Rectenna for Millimeter-Wave Power Transmission

This paper puts forth a novel dual-band dual-sense (DBDS) circularly polarized (CP) rectenna operating at 24 GHz and 28 GHz for millimeter-wave power transmission (MMPT). An arc-shaped parasitic patch is loaded near a single-layer circular patch to induce chirality. The chiral structure transforms linearly polarized (LP) waves, coupled from a slot, into left-hand CP (LHCP) and right-hand CP (RHCP) waves at the two respective operating frequencies. The DBDS CP antenna array, consisting of four antenna elements, each integrated with a substrate-integrated waveguide (SIW) cavity, achieves gains of 17.1 dBic and 17.0 dBic at 24 GHz and 28 GHz, respectively. A dual-band rectifying circuit, comprising two L-section impedance transformers and three fan-shaped low-pass filters, is designed and integrated with the antenna array to form the DBDS CP rectenna. The proposed rectenna achieves maximum conversion efficiencies of 49.1% and 47.8% at 24 GHz and 28 GHz, respectively, both at an input power of 18 dBm. The compact structure and low profile make it suitable for large-scale array applications in MMPT systems.