الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 126 |  |  |
| | | from | 126 | | |
Abstract
These days, a lot of efforts are directed toward solving the power crisis on account of
depletion of fossil fuel. This has resulted in new tactics in power industry like developing new sources of power and harvesting already the wasted power. Energy harvesting
(EH) circuits are expected to be key modules for future battery-constrained electronic
devices such as mobile phones and wearable devices. Ambient energy sources are classified as energy tanks, energy distribution methods, or energy harvesting methods, which
may enable portable or wireless systems to be completely battery independent and selfsustaining. This study provides a comprehensive survey of environmentally friendly energy harvesting methods such as Radio-Frequency (RF), heat, mechanical, solar, acoustic, wind, wave, etc., and provides a summary of electronic circuits utilized in this field
alongside various power sources which are compared concerning voltage and harvested
power. It also discussesthe hybrid energy harvesting system (HEHS), and compares with
single energy harvesting system (SEHS).
Radio-frequency (RF) harvesting is one of the promising EH technologies, which converts RF signals into direct-current (DC) voltage. This thesis proposed an efficient design
for the voltage doubler subsystem for an RF-EH module using different types of Schottky
diodes, namely HSMS-2822, HSMS-2850, and HSMS-286B. Greinacher voltage doubler circuits for multi-bands including 915 MHz (GSM), (2.4, and 5.2) GHz (WI-FI)
bands are scrutinized. Up to 10 stages of Schottky diode voltage doubler circuits are investigated , where the performance is evaluated using Agilent ADS software. The results
showed that the HSMS-286B Schottky diode reveals a better performance with GSM
band sources, while HSMS-2850 is the optimum choice for the Wi-Fi band.
Additionally, This thesis emphasized on one of the promising electricity generation methods using piezoelectric materials. A circuit was designed to convert the pressure from the
sound around us into an electric power to charge small powered devices like cell phones
by using an appropriate voltage doubler circuit.