Abstract
The system capable of harvesting RF energy from the environment through an antenna and converting it into direct current energy to deliver to a load is known as rectenna. The rectifier circuit is an important part of the rectenna and its modeling is arduous since it employs a non-linear device working at extremely low power levels. In addition, there are some losses in the system. Thus, the design of a high-efficient rectifier is a great challenge. In this work, several rectifier topologies are optimized, using the Genetic Algorithm, in order to achieve the highest efficiency and output voltage. An analysis of the influence of the variables on the output of these rectifiers was also performed. The topologies under investigation were optimized for -15 dBm input power and 2.45 GHz operating frequency, in accordance with the most suitable band for energy harvesting. Under these conditions, the Monodiode Series topology presents the best performance. When the input power is -15 dBm, it presents an output voltage of 402 mV and an efficiency of 51.3%. At that power level, the achieved efficiency is higher than that found in the literature.
Highlights
In recent years there has been great progress in technology due to the advancement of microelectronics leading to the integration of systems into a single device
The series topology provides even better performance as the input power decreases to −20 dBm or increases to −10 dBm in order to take into account the fact that the available electromagnetic radiation in the air is very low and not constant
In this work the optimization of different topologies of rectifier circuits operating with ultra-lowpower for the purpose of harvesting and transmitting wireless energy was presented
Summary
In recent years there has been great progress in technology due to the advancement of microelectronics leading to the integration of systems into a single device. Metamaterials have the ability, for example, to improve antenna performance by increasing their bandwidth and gain and decreasing the value of return loss, making them more useful for efficient application in power harvesting and wireless communication systems [3].The last method, Electromagnetic Radiation, has as its main application the recharging of lithium-ion batteries. In this method, there is the transmitting source and a receiver called rectenna which is an integrated circuit with a receiving antenna used to convert the transmitter's radio frequency energy into continuous energy. Input Frequency Power 950 MHz −20 dBm 940 MHz −20 dBm 2.45 GHz −20 dBm 2.45 GHz −20 dBm 900 MHz −15 dBm
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