A Compact Stacked Multisector Near-Isotropic Coverage Rectenna Array System for IoT Applications

A low-profile, fully integrated, eight-sector rectenna array is proposed to achieve near-isotropic coverage for an angular misalignment-tolerant wireless power transfer (WPT) system. The proposed design incorporates a new Schottky diode connection strategy to simplify the integration of the rectenna elements (ReEs). The system utilizes a hybrid combining topology and conjugate impedance matching of ReEs with Schottky diode impedance. This reduces circuit losses and enhances system power conversion efficiency (PCE). Additionally, the hybrid combining scheme improves the output dc voltage and the optimal load. Moreover, the sustainable battery-less operation of a wireless sensor node is realized by employing a power management unit (PMU) with the proposed system.