The high tech industrial revolution in the last fifty years depleted and ruined
the planet natural resources. Energy harvesting is the main challenge in the research
in green technologies. Compact wideband efficient antennas are crucial for energy
harvesting portable sensors and systems. Small antennas have low efficiency. The
efficiency of 5G, IoT communication and energy harvesting systems may be improved
by using wideband efficient passive and active antennas. The system dynamic range may be improved by connecting
amplifiers to the small antenna feed line. Ultra-wideband portable harvesting systems are presented in this paper. This
paper presents new Ultra-Wideband energy harvesting system and antennas in frequencies
ranging from 0.15 GHz to 18 GHz. Three wideband antennas cover the frequency range
from 0.15 GHz to 18 GHz. A wideband metamaterial antenna with metallic strips covers
the frequency range from 0.15 GHz to 0.42 GHz. The antenna bandwidth is around 75%
for VSWR better than 2.3:1. A wideband slot antenna covers the frequency range from
0.4 GHz to 6.4 GHz. A wideband fractal notch antenna covers the frequency range
from 6 GHz to 18 GHz. Printed passive and active notch and slot antennas are compact,
low cost and have low volume. The active antennas may be employed in energy harvesting
portable systems. The antennas and the harvesting system components may be assembled
on the same, printed board. The printed notch and slot antennas bandwidth are from
75% to 100% for VSWR better than 3:1. The slot and notch antenna gain is around
3 dBi with efficiency higher than 90%. The antennas electrical parameters were
computed in free space and near the human body. There is a good agreement between
computed and measured results.
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