In this paper, an efficiency improvement method in the wireless power transfer system based on magnetic resonance is proposed. A combined helical-spiral structure is adopted for self-resonant coil and source and device coils are designed using circular loop structure. The proposed resonator utilizing combined helical-spiral structure yields 13 % efficiency improvement over that of an existing helical type resonator when the transmitting and receiving coils are separated by 120 mm. In addition, the size can be reduced by 33 % comparing to the previous resonator.
The denudation scheme based on vacancy-assisted BMD [Bulk Micro Defect] formation for reducing grown-in defects and the method of reducing STI-stress caused by denudation thermal budget was investigated to improve the retention time of high density DRAM with STI[Shallow Trench Isolation]. In this paper, we report the denudation scheme employing low-cost FPFCIFast-Pull and Fast-Cool] ingot growing, combined with proper arrangement of subsequent thermal budget, resulting in excellent improvement of DRAM retention time.
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