Abstract
Technology is advancing daily and it has impacted almost every aspect of our life today. We are showing that growth in several miniaturized communications systems that are covering different wireless services capable of achieving a wide frequency range. It is so difficult to powering permanently wireless systems and it becomes crucial to improve the energy autonomy of these objects. So, the harvesting and transport of RF energy is a topical subject with multiple challenges. The present work aims to propose a rectenna system with high efficiency. We propose an ultra-wideband antenna array allowing to harvest RF energy from different frequency bands, especially the most often exploited, such as 4G and Wi-Fi bands. The major constraint is that receiving antenna must keep reasonable dimensions. On the other hand, we proposed three topologies of rectifying circuits. A parametric study is done to follow the influence of input power and load resistance on rectenna system performance. It has been shown that the efficiency can reach 84% for a load resistance of 2.8 kΩ and an input power of 5 dBm. A prototype is made to validate the results obtained by software simulations.
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