Energy Harvesting for Wireless Sensor Nodes Using Rectenna

Wireless sensor nodes generally operate using energy from source line batteries, which need to be replaced or recharge from time to time. The connection of electromagnetic energy to DC energy, which is called radiofrequency (RF) energy harvesting, is one of the best techniques to act as an energy source for this equipment. An ambient amount of RF energy is present in our environment radiated from numerous sources so that it can act as a much predictable source of energy as compared to other techniques of energy harvesting. This system eliminates the periodic replacement of energy batteries for these sensor nodes. Despite the enormous RF energy present in the environment, the power per unit area is quite low. Hence, the major barrier is to increase the output of the rectifier circuit, even though the power density is low.