13.56 MHz Near Field magnetic coupling efficiency evaluation for IMDs powering

2019 ◽  
Author(s):  
Antoine Diet ◽  
Marc Biancheri-Astier ◽  
Yann Le Bihan ◽  
Pablo Perez-Nicoli ◽  
Madjda Bouklachi ◽  
...  
Keyword(s):  
Near Field ◽  
Coupling Efficiency ◽  
Magnetic Coupling ◽  
Efficiency Evaluation

scholarly journals An Enhanced Multiplication of RF Energy Harvesting Efficiency Using Relay Resonator for Food Monitoring

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 1963 ◽  
Author(s):  
Xuan-Tu Cao ◽  
Wan-Young Chung
Keyword(s):  
Energy Harvesting ◽  
Power Transmission ◽  
Near Field ◽  
Magnetic Coupling ◽  
Electrical Energy ◽  
Transmission Efficiency ◽  
Smart Sensor ◽  
Rf Energy Harvesting ◽  
Sensor Module ◽  
Rf Energy

Recently, radio frequency (RF) energy harvesting (RFEH) has become a promising technology for a battery-less sensor module. The ambient RF radiation from the available sources is captured by receiver antennas and converted to electrical energy, which is used to supply smart sensor modules. In this paper, an enhanced method to improve the efficiency of the RFEH system using strongly coupled electromagnetic resonance technology was proposed. A relay resonator was added between the reader and tag antennas to improve the wireless power transmission efficiency to the sensor module. The design of the relay resonator was based on the resonant technique and near-field magnetic coupling concept to improve the communication distance and the power supply for a sensor module. It was designed such that the self-resonant frequencies of the reader antenna, tag antenna, and the relay resonator are synchronous at the HF frequency (13.56MHz). The proposed method was analyzed using Thevenin equivalent circuit, simulated and experimental validated to evaluate its performance. The experimental results showed that the proposed harvesting method is able to generate a great higher power up to 10 times than that provided by conventional harvesting methods without a relay resonator. Moreover, as an empirical feasibility test of the proposed RF energy harvesting device, a smart sensor module which is placed inside a meat box was developed. It was utilized to collect vital data, including temperature, relative humidity and gas concentration, to monitor the freshness of meat. Overall, by exploiting relay resonator, the proposed smart sensor tag could continuously monitor meat freshness without any batteries at the innovative maximum distance of approximately 50 cm.

scholarly journals Visibility Graph Power Geometric Aggregation Operator and Its Application in Water, Energy and Food Efficiency Evaluation

2020 ◽  
Vol 17 (11) ◽  
pp. 3891
Author(s):  
Lihua Liu ◽  
Jing Huang ◽  
Huimin Wang
Keyword(s):  
Time Series ◽  
Time Series Data ◽  
Coupling Efficiency ◽  
Aggregation Operator ◽  
Visibility Graph ◽  
Series Data ◽  
Efficiency Evaluation ◽  
Geometric Operator ◽  
The Relationship

In the real decision-making process, there are so many time series values that need to be aggregated. In this paper, a visibility graph power geometric (VGPG) aggregation operator is developed, which is based on the complex network and power geometric operator. Time series data are converted into a visibility graph. A visibility matrix is developed to denote the links among different time series values. A new support function based on the distance of two values are proposed to measure the support degree of each other when the two time series values have visibility. The VGPG operator considers not only the relationship but also the similarity degree between two values. Meanwhile, some properties of the VGPG operator are also investigated. Finally, a case study for water, energy, and food coupling efficiency evaluation in China is illustrated to show the effectiveness of the proposed operator. Comparative analysis with the existing research is also offered to show the advantages of the proposed method.

Nano-Structures Fabrication by Laser Combined with Near-Field Scanning Optical Microscopy

2007 ◽  
Vol 329 ◽  
pp. 415-420
Author(s):  
Dong Jiang Wu ◽  
Juan Zhuang ◽  
Xu Yue Wang ◽  
Ren Ke Kang ◽  
Fu Ling Zhao
Keyword(s):  
Data Storage ◽  
Second Harmonic ◽  
Substrate Surface ◽  
Near Field ◽  
Coupling Efficiency ◽  
Laser Wavelength ◽  
Optical Diffraction ◽  
Storage Device ◽  
Feature Size ◽  
Near Field Scanning

We have developed the laser nanoprocessing technique by the integration of the fs laser and near-field scanning microscopy (NSOM). The second harmonic femtosecond laser working in the optical near-field with the assistance of NSOM equipment was applied to expose the photosensitive polymer material. The nanopatterns with feature size smaller than the laser wavelength can be fabricated. The optical diffraction limitation is therefore broken through by the near-field nanoprocessing. It was found in our experiment that the nanofabrication feature size depends strongly on the gap between the fiber probe tip and the substrate surface, as well as the laser coupling efficiency. The approach offers the advantages of high precision, speed and selectivity in nanopatterning, and is promising to be used in data storage device manufacture for higher density recording.

A Novel Magnetic Coupling UHF Near Field RFID Reader Antenna Based on Multilayer-Printed-Dipoles Array

2014 ◽  
Vol 50 (1) ◽  
pp. 1-4 ◽  
Author(s):  
X. M. Ding ◽  
K. Zhang ◽  
H. Yu ◽  
L. Zhu ◽  
C. N. Feng ◽  
...  
Keyword(s):  
Near Field ◽  
Magnetic Coupling ◽  
Rfid Reader ◽  
Reader Antenna
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