A Polarization Insensitive Circular Rectenna Array System for Microwave Power Transfer and Energy Harvesting Applications

The power harvested by a rectenna (Rx) module is highly dependent on its relative orientation with respect to the dedicated RF transmitter (Tx) which can cause polarization mismatch. Therefore, a polarization insensitive rectenna system is proposed here to address the mentioned problem. A multipolarized circular rectenna array is designed using the conjugate impedance matching technique and a shunt dc combining topology for realizing a completely integrated design. This resulted in a low-cost, miniaturized rectenna array system making it suitable for space constraint sensor nodes utilized in IoT applications.