Power harvesting for low power wireless sensor network

This paper presents a design of an inset fed square patch array and singly fed rectangular stacked patch array operating in the 2.45 GHz ISM band for RF energy harvesting. The goal of the design is to harness and store energy from the surrounding environment which can be used in wireless sensor nodes (WSN). On the basis of simulation results obtained by FEKO simulation software, the VSWR, return loss, radiation pattern, gain all meet the design requirements. Results show that dc voltage of 0.2167 V and 0.2203 V can be achieved at ¿-31.8 dBW received energy level from single layer and stacked array designs respectively at 2.45 GHz IEEE 802.11b band. This would correspond to potential working distance of 6m in both cases.