Novel mmWave Wireless Power Transfer Systems Using Broadband Circularly Polarized Rectennas and Leaky Wave Transmitters

Millimeter wave wireless power transfer (WPT) has attracted an upsurge of interest recently. Here we present the design of a novel WPT system consisting of a wideband circularly polarized leaky wave antenna transmitter and wideband circularly polarized rectenna receiver, over the frequency band of 24–35 GHz (fractional bandwidth: 37.3%). Due to the simultaneous dual-CP radiation of the leaky-wave antenna, the proposed system overcomes the polarization misalignment issue of the antennas in the far field, thereby enabling a robust WPT. Our rectenna also realizes state-of-the-art performance in terms of bandwidth, RF-DC efficiency, and CP radiation. This is the first mmWave CP WPT system and will be experimentally verified.