This paper investigates the performance of a near field wireless power transfer\nsystem that uses curved relay resonator to extend transfer distance. Near field wireless power\ntransfer operates based on the near-field electromagnetic coupling of coils. Such a system can\ntransfer energy over a relatively short distance which is of the same order of dimensions of the\ncoupled coils. The energy transfer distance can be increased using flat relay resonators. Recent\ndevelopments in printing electronics and e-textiles have seen increasing demand of embedding\nelectronics into fabrics. Near field wireless power transfer is one of the most promising\nmethods to power electronics on fabrics. The concept can be applied to body-worn textiles by,\nfor example, integrating a transmitter coil into upholstery, and a flexible receiver coil into\ngarments. Flexible textile coils take on the shape of the supporting materials such as garments,\nand therefore curved resonator and receiver coils are investigated in this work. Experimental\nresults showed that using curved relay resonator can effectively extend the wireless power\ntransfer distance. However, as the curvature of the coil increases, the performance of the\nwireless power transfer, especially the maximum received power, deteriorates.
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