Abstract:
Mobile communication, radio and television
towers, satellites orbiting earth and even the cellular phones are
continuously transmitting Radio Frequency waves. This immense
amount of energy source around us is un-utilized and with the
use of appropriate technology it could be utilized to power up
small standalone applications. This research investigation studies
the field intensity radiation pattern in a few areas for harvesting
the radio frequency waves to power micro-watt level
applications. The antenna pattern design choice, the energy
harvester design, the implementation and test results are
presented. Dipole, isotropic and spiral antennas are used to
scavenge the power and comparison of harvested power is
displayed in different locations at the coastal belt from Galle to
Colombo in Sri Lanka. Among the three tested antennas,
isotropic antenna is identified as the best antenna for energy
harvesting in the Sri Lankan perspective. The practical
application based on the designed harvester system is presented.
