Identification and Model of Near Field Magnetic Coupling in a PFC Converter

2006 ◽  
Author(s):  
He Junping ◽  
Jiang Jianguo ◽  
Chen Wei
Keyword(s):  
Near Field ◽  
Magnetic Coupling

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.

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

Design of Antenna for UHF Near-Field RFID Reader

2012 ◽  
Vol 236-237 ◽  
pp. 889-891
Author(s):  
Zou Tao ◽  
Yong Zhong Zhu
Keyword(s):  
Radio Frequency Identification ◽  
Printed Circuit Board ◽  
Near Field ◽  
Impedance Matching ◽  
Magnetic Coupling ◽  
Circuit Board ◽  
Printed Circuit ◽  
Rfid Reader ◽  
Frequency Identification ◽  
Operating Bandwidth

A segmented loop antenna is presented for ultra-high frequency (UHF) near-field radio frequency identification (RFID) reader. The segmented antennas have been constructed that can operate at resonant diameters while still providing good magnetic coupling. The antenna printed on a FR4 printed circuit board (PCB) with an overall size of 170× 170 × 1 mm3 achieves good impedance matching and uniform magnetic field distribution over an operating bandwidth of 840–1120 MHz, which is desirable for UHF near-field RFID reader applications.

A Magnetic Coupling Dipole for UHF Near-Field RFID Reader

2012 ◽  
Vol 48 (11) ◽  
pp. 4305-4308 ◽  
Author(s):  
Xumin Ding ◽  
Qun Wu ◽  
Kuang Zhang ◽  
Chunnan Feng
Keyword(s):  
Near Field ◽  
Magnetic Coupling ◽  
Rfid Reader

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
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