scholarly journals Compact Wearable Meta Materials Antennas for Energy Harvesting Systems, Medical and IOT Systems

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1340 ◽  
Author(s):  
Albert Sabban
Keyword(s):  
Energy Harvesting ◽  
High Efficiency ◽  
Dynamic Range ◽  
Green Energy ◽  
Ring Resonators ◽  
Green Technologies ◽  
Continuous Growth ◽  
Harvesting Systems ◽  
Low Efficiency ◽  
Line Design

Demand for green technologies and green energy is in continuous growth in the last decade. Compact efficient radiators are very important for energy harvesting portable systems. Small antennas have low efficiency. The efficiency of communication and energy harvesting systems may increase by using efficient passive and active antennas. The system dynamic range may be improved by connecting amplifiers to the printed antenna feed line. Design, design considerations, computed and measured results of wearable meta-materials antennas with high efficiency for energy harvesting applications are presented in this paper. The antennas electrical parameters on human body were analyzed by using commercial full-wave software. The wearable antennas are compact and flexible and are 1.6 mm thick. The directivity and gain of the antennas with Split-ring resonators (SRR), is higher by 2 dB to 3 dB than the antennas without SRR. The resonant frequency of the antennas without SRR is higher by 5% to 10% than the antennas with SRR.

scholarly journals Wideband Systems with Energy Harvesting Units for 5G, Medical and Computer Industry

2021 ◽  
Author(s):  
Albert Sabban
Keyword(s):  
Energy Harvesting ◽  
Electrical Energy ◽  
Green Energy ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Slot Antennas ◽  
Rf Systems ◽  
Harvesting Systems ◽  
Low Efficiency ◽  
Better Than

Demand for green energy is in tremendous growth in the last decade. The continuous growth in production of portable RF systems increase the consumption of batteries and electrical energy. Batteries and conventional electrical energy increase the environmental pollution. Compact wideband efficient antennas are crucial for energy harvesting commercial 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 antennas. Ultra-wideband portable harvesting systems are presented in this chapter. This chapter presents new Ultra-Wideband energy harvesting system and antennas in frequencies ranging from 0.15GHz to 18GHz. Three wideband antennas cover the frequency range from 0.15GHz to 18GHz. A wideband metamaterial antenna with metallic strips covers the frequency range from 0.15GHz to 0.42GHz. The antenna bandwidth is around 75% for VSWR better than 2.3:1. A wideband slot antenna covers the frequency range from 0.4GHz to 6.4GHz. A wideband fractal notch antenna covers the frequency range from 6GHz to 18GHz. 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 antennas bandwidth is from 75–200% for VSWR better than 3:1. The antennas gain is around 3 dBi with efficiency higher than 90%. The antennas electrical parameters were computed by using 3D electromagnetic software in free space and in vicinity of the human body. There is a good agreement between computed and measured results.

Embedded Metamaterial Subframe Patch for Increased Power Output of Piezoelectric Energy Harvesters

2021 ◽  
pp. 1-9
Author(s):  
Saman Farhangdoust ◽  
Gary Georgeson ◽  
Jeong-Beom Ihn ◽  
Armin Mehrabi
Keyword(s):  
Energy Harvesting ◽  
Cantilever Beam ◽  
Renewable Energy Sources ◽  
Piezoelectric Element ◽  
Energy Harvesters ◽  
Piezoelectric Energy ◽  
Harvesting Systems ◽  
Host Structure ◽  
Self Powered ◽  
Low Efficiency

Abstract These days, piezoelectric energy harvesting (PEH) is introduced as one of the clean and renewable energy sources for powering the self-powered sensors utilized for wireless condition monitoring of structures. However, low efficiency is the biggest drawback of the PEHs. This paper introduces an innovative embedded metamaterial subframe (MetaSub) patch as a practical solution to address the low throughput limitation of conventional PEHs whose host structure has already been constructed or installed. To evaluate the performance of the embedded MetaSub patch (EMSP), a cantilever beam is considered as the host structure in this study. The EMSP transfers the auxetic behavior to the piezoelectric element (PZT) wherever substituting a regular beam with an auxetic beam is either impracticable or suboptimal. The concept of the EMSP is numerically validated, and the COMSOL Multiphysics software was employed to investigate its performance when a cantilever beam is subjected to different amplitude and frequency. The FEM results demonstrate that the harvesting power in cases that use the EMSP can be amplified up to 5.5 times compared to a piezoelectric cantilever energy harvester without patch. This paper opens up a great potential of using EMSP for different types of energy harvesting systems in biomedical, acoustics, civil, electrical, aerospace, and mechanical engineering applications.

High-Efficiency Millimeter-Wave Energy-Harvesting Systems With Milliwatt-Level Output Power

2017 ◽  
Vol 64 (6) ◽  
pp. 605-609 ◽  
Author(s):  
Med Nariman ◽  
Farid Shirinfar ◽  
Sudhakar Pamarti ◽  
Ahmadreza Rofougaran ◽  
Franco De Flaviis
Keyword(s):  
Energy Harvesting ◽  
Output Power ◽  
Millimeter Wave ◽  
Wave Energy ◽  
High Efficiency ◽  
Harvesting Systems

scholarly journals Metamaterial Impedance Matching Network for Ambient RF-Energy Harvesting Operating at 2.4 GHz and 5 GHz

Electronics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1196
Author(s):  
Ertugrul Coskuner ◽  
Joan J. Garcia-Garcia
Keyword(s):  
Energy Harvesting ◽  
Transmission Lines ◽  
Degrees Of Freedom ◽  
Impedance Matching ◽  
Matching Network ◽  
Rf Energy Harvesting ◽  
Harvesting Systems ◽  
Rf Energy ◽  
5 Ghz ◽  
Line Design

This paper points out the viability of the utilization of metamaterial transmission lines as a multifrequency impedance matching network, improving RF-Energy Harvesting systems operating around 2.4 GHz and 5 GHz. Metamaterial transmission lines introduce additional degrees of freedom in the transmission line design, providing the possibility to match the impedance in multiple bands. The impedance matching structure has been designed and optimized using ADS simulator to match the input impedance of a four-diode-bridge rectifier connected to an energy management system. The proposed Metamaterial Impedance Matching Network (MIMN) has been fabricated using standard PCB technologies and tested in a full operative ambient RF-Energy Harvesting System obtaining a DC output voltage of 1.8 V in a 6.8 mF supercapacitor.

A High Efficiency Self-Powered Rectifier for Piezoelectric Energy Harvesting Systems

2016 ◽  
Vol 25 (12) ◽  
pp. 1650164 ◽  
Author(s):  
Jingmin Wang ◽  
Zheng Yang ◽  
Zhangming Zhu ◽  
Yintang Yang
Keyword(s):  
Energy Harvesting ◽  
Power Efficiency ◽  
High Efficiency ◽  
Supply Voltage ◽  
Voltage Drop ◽  
Current Source ◽  
Power Extraction ◽  
Piezoelectric Energy ◽  
Harvesting Systems ◽  
Self Powered

A high efficiency self-powered rectifier for piezoelectric (PE) energy harvesting systems is proposed. The rectifier in this paper increases the harvested power from the PE transducer by using two switches to reset the transducer capacitor when appropriate. The control circuit for the proposed rectifier is simple and does not require an external supply voltage. Furthermore, the passive diode of the conventional full-bridge (FB) rectifier is replaced by active diode to reduce the voltage drop along the conduction path and thereby increases the power extraction and conversion capability. Based on SMIC 0.18[Formula: see text][Formula: see text]m standard CMOS technology, the simulation results show the voltage conversion efficiency can reach up to 98.9% and the maximum power efficiency is 93.1% when the input current source [Formula: see text]A in parallel with internal capacitor [Formula: see text][Formula: see text]nF and internal resistor [Formula: see text][Formula: see text]M[Formula: see text].

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