RF Energy Harvesting Using High Impedance Asymmetric Antenna Array without Impedance Matching Network

Radio Science ◽  
2021 ◽  
Author(s):  
Mohammad M. Fakharian
Keyword(s):  
Energy Harvesting ◽  
Antenna Array ◽  
Impedance Matching ◽  
Matching Network ◽  
Rf Energy Harvesting ◽  
High Impedance ◽  
Rf Energy

scholarly journals Flexible milimeter-wave microstrip patch antenna array for wearable RF energy harvesting applications

2021 ◽  
Vol 11 (3) ◽  
pp. 1976
Author(s):  
Mohd Saiful Riza Bashri ◽  
Noor Amalina Ramli
Keyword(s):  
Energy Harvesting ◽  
Antenna Array ◽  
Patch Antenna ◽  
Impedance Matching ◽  
Microstrip Patch Antenna ◽  
Structural Deformation ◽  
Body Parts ◽  
Rf Energy Harvesting ◽  
Microstrip Patch ◽  
Rf Energy

In this paper, a series-fed milimeter-wave microstrip patch antenna array operating at 28 GHz is presented for wearable radio-frequency (RF) energy harvesting applications. The antenna array is made of 4×4 rectangular microstrip elements on a polyethylene terephthalate (PET) substrate to provide conformability when directly attached on human body parts. A 4-way Wilkinson power divider is connected to the array for RF power combining. The overall size of the antenna is 47×28×0.25 mm. The half-power beamwidth (HPBW) of the antenna array can be increased up to 151.9⁰ via structural deformation making it suitable for energy harvesting applications. The performance of the antenna array is investigated in terms of impedance matching, gain and radiation pattern. The average simulated specific absorption rate (SAR) of the antenna is 0.52 W/kg which is well below the safety limit of 1.6 W/kg averaged over 1 g of tissue for 100 mW of input power.

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.

scholarly journals Silver Sandwiched ITO Based Transparent Antenna Array for RF Energy Harvesting in 5G Mid-Range of Frequencies

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Nermeen A. Eltresy ◽  
Abd Elhamid M. Abd Elhamid ◽  
Dalia N. Elsheakh ◽  
Hadia M. Elhennawy ◽  
Esmat A. Abdallah
Keyword(s):  
Energy Harvesting ◽  
Antenna Array ◽  
Rf Energy Harvesting ◽  
Rf Energy

A Multiband RF Energy Harvesting System for Efficient Power Conversion

2020 ◽  
Author(s):  
M. Shafiqur Rahman ◽  
Uttam K. Chakravarty
Keyword(s):  
Energy Harvesting ◽  
Impedance Matching ◽  
Power Conversion ◽  
Load Resistance ◽  
Mathematical Programming Problem ◽  
Rf Energy Harvesting ◽  
Voltage Multiplier ◽  
Overall Efficiency ◽  
Rf Energy ◽  
Multiplier Circuit

Abstract This paper presents a radio frequency (RF) energy harvesting (RFEH) system with a multiband antenna configuration that can simultaneously harvest energy from the sub-6 GHz and 5G millimeter-wave (mm-Wave) frequency bands. The performance of the RFEH system is studied from −25 dBm to 5 dBm input power levels underlying the maximization of the overall efficiency and possible optimization strategies. The maximum achievable power conversion efficiency (PCE) is formulated as a mathematical programming problem and solved by optimizing the design factors including antenna geometry, operational frequencies, rectifier topologies, and rectifier parameters. An array of broadband high gain patch antennas with reconfigurable rectifiers, an impedance matching network, and a voltage-multiplier circuit are employed in the system to maximize the PCE. The voltage standing wave ratio (VSWR) and reflection coefficient (S11) of the antenna are estimated and optimized by numerical method. Simulations are conducted to evaluate the performances of the rectenna and the voltage-multiplier circuit. Results for radiation pattern, wave absorption, input impedance, voltage, and power across the load resistance as a function of frequency are obtained for the optimized configuration. The overall efficiency of the optimized RFEH system is measured at various power inputs and load resistances.

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