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For OAM-based communications and target detection purposes, the OAM-generating method based on planar antenna and the concentric-ring array is proposed, which can collimate the main-lobe direction and suppress the side lobes simultaneously. The total radiation pattern is derived firstly and the feeding coefficient for each ring is optimized utilizing the genetic algorithm (GA). Subsequently, the planar...
The grounding performance of EMU (Electric Multiple Unit) is related to the safe operation of high-speed train, and unreasonable protective grounding scheme can bring problems such as abnormal wear of grounding brush, high electrical potential of train body, etc. At present, grounding brushes of CRH380B wear seriously and often need to be replaced. Therefore, it is necessary to optimize the grounding...
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