Although the worldwide demand for energy is increasing rapidly,the availability of current traditional resources(such as atomic and thermal power)is insufficient.Hence,artificial(man-made)energy sources are required.A...Although the worldwide demand for energy is increasing rapidly,the availability of current traditional resources(such as atomic and thermal power)is insufficient.Hence,artificial(man-made)energy sources are required.Advancements in wireless technology have raised the radio frequency(RF)levels in the environment.These RF waves are available at all times,unlike natural resources such as solar,hydro,and wind energy.The energy requirement and consumption of electronic devices have also been reduced over last decade.Hence,harvesting energy from RF waves and driving low-power devices are the simplest solutions.In the current work,a simplified monopole antenna,called a tri-stepped rectangular antenna for RF harvesting,is proposed.Here,the regular rectangular structure is modified to a step-like structure to achieve impedance matching and maximize the omni-directional gain at all mobile frequencies.This antenna functions with the LTE B5(850),GSM 900,GSM 1800,3G,4G,and ISM(2.4 GHz)systems.We have also demonstrated a proof-of-concept of energy harvesting using RF waves generated by mobile towers and Wi-Fi devices.The system can generate up to 12 mV(14.4 mW)and could charge a battery of rating 3.7 V,500 mAh.We anticipate this harvested energy to be used in driving the WSN node,Bluetooth devices,and mobile charging.展开更多
文摘Although the worldwide demand for energy is increasing rapidly,the availability of current traditional resources(such as atomic and thermal power)is insufficient.Hence,artificial(man-made)energy sources are required.Advancements in wireless technology have raised the radio frequency(RF)levels in the environment.These RF waves are available at all times,unlike natural resources such as solar,hydro,and wind energy.The energy requirement and consumption of electronic devices have also been reduced over last decade.Hence,harvesting energy from RF waves and driving low-power devices are the simplest solutions.In the current work,a simplified monopole antenna,called a tri-stepped rectangular antenna for RF harvesting,is proposed.Here,the regular rectangular structure is modified to a step-like structure to achieve impedance matching and maximize the omni-directional gain at all mobile frequencies.This antenna functions with the LTE B5(850),GSM 900,GSM 1800,3G,4G,and ISM(2.4 GHz)systems.We have also demonstrated a proof-of-concept of energy harvesting using RF waves generated by mobile towers and Wi-Fi devices.The system can generate up to 12 mV(14.4 mW)and could charge a battery of rating 3.7 V,500 mAh.We anticipate this harvested energy to be used in driving the WSN node,Bluetooth devices,and mobile charging.
