scholarly journals Investigation of Micromachined Antenna Substrates Operating at 5 GHz for RF Energy Harvesting Applications

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 146 ◽  
Author(s):  
Noor Mohd Yunus ◽  
Jumril Yunas ◽  
Alipah Pawi ◽  
Zeti Rhazali ◽  
Jahariah Sampe
Keyword(s):  
Energy Harvesting ◽  
Complementary Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Rf Energy Harvesting ◽  
Antenna Performance ◽  
Harvesting Systems ◽  
Rf Energy ◽  
Rf Antenna ◽  
5 Ghz ◽  
Micro Electromechanical System

This paper investigates micromachined antenna performance operating at 5 GHz for radio frequency (RF) energy harvesting applications by comparing different substrate materials and fabrication modes. The research aims to discover appropriate antenna designs that can be integrated with the rectifier circuit and fabricated in a CMOS (Complementary Metal-Oxide Semiconductor)-compatible process approach. Therefore, the investigation involves the comparison of three different micromachined antenna substrate materials, including micromachined Si surface, micromachined Si bulk with air gaps, and micromachined glass-surface antenna, as well as conventional RT/Duroid-5880 (Rogers Corp., Chandler, AZ, USA)-based antenna as the reference. The characteristics of the antennas have been analysed using CST-MWS (CST MICROWAVE STUDIO®—High Frequency EM Simulation Tool). The results show that the Si-surface micromachined antenna does not meet the parameter requirement for RF antenna specification. However, by creating an air gap on the Si substrate using a micro-electromechanical system (MEMS) process, the antenna performance could be improved. On the other hand, the glass-based antenna presents a good S11 parameter, wide bandwidth, VSWR (Voltage Standing Wave Ratio) ≤ 2, omnidirectional radiation pattern and acceptable maximum gain of >5 dB. The measurement results on the fabricated glass-based antenna show good agreement with the simulation results. The study on the alternative antenna substrates and structures is especially useful for the development of integrated patch antennas for RF energy harvesting systems.

scholarly journals A Dual-Band Antenna for RF Energy Harvesting Systems in Wireless Sensor Networks

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
A. Bakkali ◽  
J. Pelegri-Sebastia ◽  
T. Sogorb ◽  
V. Llario ◽  
A. Bou-Escriva
Keyword(s):  
Energy Harvesting ◽  
Dual Band ◽  
Design Parameters ◽  
Rf Energy Harvesting ◽  
Radio Frequency Energy ◽  
Dual Band Antenna ◽  
Receiving Antenna ◽  
Harvesting Systems ◽  
Rf Energy ◽  
5 Ghz

In this paper, we focus on ambient radio frequency energy available from commercial broadcasting stations in order to provide a system based on RF energy harvesting using a new design of receiving antenna. Several antenna designs have been proposed for use in RF energy harvesting systems, as a pertinent receiving antenna design is highly required since the antenna features can affect the amount of energy harvested. The proposed antenna is aimed at greatly increasing the energy harvesting efficiency over Wi-Fi bands: 2.45 GHz and 5 GHz. This provides a promising alternative energy source in order to power sensors located in harsh environments or remote places, where other energy sources are impracticable. The dual-band antenna can be easily integrated with RF energy harvesting system on the same circuit board. Simulations and measurements were carried out to evaluate the antenna performances and investigate the effects of different design parameters on the antenna performance. The receiving antenna meets the required bandwidth specification and provides peak gain of more than 4 dBi across the operating band.

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 review of RF energy harvesting systems in India

2015 ◽  
Author(s):  
Jasmine Jose ◽  
Sherin George ◽  
Lydia Bosco ◽  
Juliet Bhandari ◽  
Freda Fernandes ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Rf Energy Harvesting ◽  
Harvesting Systems ◽  
Rf Energy

scholarly journals An IC architecture for RF Energy Harvesting systems

2017 ◽  
Vol 13 (2) ◽  
pp. 96 ◽  
Author(s):  
Leonardo Pantoli ◽  
Alfiero Leoni ◽  
Vincenzo Stornelli ◽  
Giuseppe Ferri
Keyword(s):  
Energy Harvesting ◽  
Integrated System ◽  
Voltage Source ◽  
Rf Energy Harvesting ◽  
Chip Area ◽  
Dc Voltage ◽  
Input Signals ◽  
Harvesting Systems ◽  
Overall Efficiency ◽  
Rf Energy

In this work we present an IC architecture for RF energy harvesting. The system has been designed with a 0.18μm CMOS SMIC technology and optimized at 900MHz. Simulation results have confirmed that the integrated system handles an incoming power typically ranging from -25 dBm to 20 dBm by rectifying the variable input signals into a DC voltage source with an overall efficiency up to 50%. The chip area estimation for the proposed system is as low as 3x3mm2.

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