| Summary: | 碩士 === 逢甲大學 === 通訊工程學系 === 106 === With the increasing number of wireless devices implemented in recent years, environmental electromagnetic waves are everywhere all around. Despite EMI noise from digital devices, most of electromagnetic waves energy originate from the various wireless communication systems, such as 4G/LTE, wireless local area network (WLAN), Bluetooth, and radio frequency identification systems (RFID) etc. As green energy is getting more popular, the application of rectennas is used more widely to convert those environmental electromagnetic waves into reusable energy.
Therefore, the research objective of this thesis is to design a half-wave quadruple voltage rectifier circuit and integrate with the receiving antenna to build an energy harvesting system. The study includes the energy receiving of far-field radiation and near-field coupling, and investigates how the ambient electromagnetic energy can be collected and converted into circuit voltage with conversion efficiency analyzed.
This thesis will focus on the study and implementation of the back-side rectifier circuit and different types of receiving antennas. The selected antenna type was Yagi antenna with high-gain tuned to the 2.45 GHz for WLAN environment and a UWB antenna for collecting the near field EMI noise generated by digital devices. To verify the system with experiment, the energy-harvesting module was placed on fixture for the wireless router and stuck on the back of the TV screen for near-field EMI capture with the highest conversion voltage were 1.505 V and 0.788 V respectively.
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