scholarly journals MECHANISM OF TWO RESONANT MODES FOR HIGHLY RESONANT WIRELESS POWER TRANSFER AND SPECIFIC ABSORPTION RATE

2016 ◽  
Vol 69 ◽  
pp. 181-190 ◽  
Author(s):  
Sang Wook Park
Keyword(s):  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Specific Absorption ◽  
Resonant Modes

scholarly journals Miniaturized implantable power transmission system for biomedical wireless applications

2020 ◽  
Vol 7 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Shuoliang Ding ◽  
Stavros Koulouridis ◽  
Lionel Pichon
Keyword(s):  
Reflection Coefficient ◽  
Radiation Pattern ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Power Transmission ◽  
Antenna Design ◽  
Wireless Power ◽  
Specific Absorption ◽  
Wireless Applications ◽  
Power Needs

AbstractIn this paper, a complete wireless power transmission scenario is presented, including an external transmission antenna, an in-body embedded antenna, a rectifying circuit, and a powered sensor. This system operates at the Industrial, Scientific, and Medical bands (902.8–928 MHz). For the antenna design, important parameters including reflection coefficient, radiation pattern, and specific absorption rate are presented. As for the rectifying circuit, a precise model is created utilizing off-the-shelf components. Several circuit models and components are examined in order to obtain optimum results. Finally, this work is evaluated against various sensors' power needs found in literature.

scholarly journals Evaluation of Specific Absorption Rate in Three-Layered Tissue Model at 13.56 MHz and 40.68 MHz for Inductively Powered Biomedical Implants

2019 ◽  
Vol 9 (6) ◽  
pp. 1125 ◽  
Author(s):  
Krithikaa Mohanarangam ◽  
Yellappa Palagani ◽  
Jun Choi
Keyword(s):  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Printed Circuit Board ◽  
Input Power ◽  
Circuit Board ◽  
Power Transfer ◽  
Angular Misalignment ◽  
Specific Absorption ◽  
Measurement Results ◽  
Power Transfer Efficiency

This paper presents an optimized 3-coil inductive wireless power transfer (WPT) system at 13.56 MHz and 40.68 MHz to show and compare the specific absorption rate (SAR) effects on human tissue. This work also substantiates the effects of perfect alignment, lateral and/or angular misalignments on the power transfer efficiency (PTE) of the proposed WPT system. Additionally, the impacts of different tissue composition, input power and coil shape on the SAR are analyzed. The distance between the external and implantable coils is 10 mm. The results have been verified through simulations and measurements. The simulated results show that the SAR of the system at 40.68 MHz had crossed the limit designated by the Federal Communications Commission and hence, it is unsafe and causes tissue damage. Measurement results of the system in air medium show that the optimized printed circuit board coils at 13.56 MHz achieved a PTE of 41.7% whereas PTE waned to 18.2% and 15.4% at 10 mm of lateral misalignment and 60° of angular misalignment respectively. The PTE of a combination of 10 mm lateral misalignment and 60° angular misalignment is 21%. To analyze in a real-environment, a boneless pork sample with 10 mm of thickness is placed as a medium between the external and implantable coils. At perfect alignment, the PTE through pork sample is 30.8%. A RF power generator operating at 13.56 MHz provides 1 W input power to the external coil and the power delivered to load through the air and tissue mediums are 347 mW and 266 mW respectively.

Scaling Law of Coupling Coefficient and Coil Size in Wireless Power Transfer Design via Magnetic Coupling

2017 ◽  
Vol 137 (4) ◽  
pp. 326-333
Author(s):  
Chiaki Nagai ◽  
Kenji Inukai ◽  
Masato Kobayashi ◽  
Tatsuya Tanaka ◽  
Kensho Abumi ◽  
...  
Keyword(s):  
Coupling Coefficient ◽  
Scaling Law ◽  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Coil Size
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