Browsing by Author "Isingo, Fredrick"

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    An effcient radio frequency energy harvester for iot devices in Tanzania
    (University of Dar es Salaam, 2020) Isingo, Fredrick
    An effcient radio frequency energy harvester for iot devices in Tanzania Fredrick Isingo M.Sc(Electronics Science and Communications) University of Dar es salaam,CoICT, 2020 Radio Frequency (RF) energy harvesting is gaining more popularity as an alternative source of energy for ultra-low power devices within the Internet to Things (IoT) and beyond, it is also demonstrating a promising future for energizing low power electronic devices. Currently, several kinds of research have been conducted to extract as much power as possible from the harvested RF energy in spite of its low power density, leading to low output voltages and current insufficient to be utilized directly by electronic devices. This poses a major challenge in designing and implementing such harvesters. This research was aimed at designing an efficient and effective radio frequency energy harvester, it was achieved by surveying and knowing the available and harvestable RF with their respective signal powers, designing an appropriate impedance matching network for a specific frequency allowing maximum power transfer to a first stage voltage multiplier, the later was integrating the voltage multipliers to form a hybrid voltage multiplier. The proposed design was setup and simulated using Key sight’s Advanced Design System (ADS) 2019 with real time values obtained from the RF survey. The results obtained from the RF survey show the harvestable frequency bands having a Received Signal Strength Intensity (RSSI) greater than -50dBm were 800MHz, 1800 MHz, 2100 MHz and 2400 MHz. Each band had its dedicated independent impedance topology designed to tunnel its maximum power with a pre-boost single stage voltage multiplier. The simulation results reveal that, by using narrowband impedance matching, the power transfer from source to load increases by 35% and the output power increases by a factor of (1.2 - 2) Volts. The hybrid voltage multiplier achieved outputs ranging from 3.6 to 7 Volts at -55 to -20 dBm respectively. The output generated can be used to power ultra-low-power sensors, remotes, loggers, and computer peripherals for an endlessly period hence battery less gadgets that can last longer and eliminate battery dependency and usage.