Abstract

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.

Highlights

  • In the last fifty years, the universe has suffered rapid changes in climate

  • 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

Read more

Summary

Introduction

In the last fifty years, the universe has suffered rapid changes in climate. It is obvious in 2020 to most of the world population that green energy is crucial to save the universe from climate changes. The antenna gain is around 3.5 dBi. Figure 13 presents the radiation pattern of the wideband notch antenna with fractal structure at 8GHz. The antenna matching network was optimized to get better S11 results at 16 GHz to 18 GHz. The length and width of the stubs were tuned to get better S11 results at 16 GHz to 18 GHz

Wideband Energy Harvesting Systems and Applications
Findings
Conclusion
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call