Flexible electronics, as an essential branch of wearable electronics, have recently attracted extensive research owing to their wide range of applications in healthcare tracking, human-machine interface, wireless communication, or energy generator. These electronic devices are flexible and small in size to add on clothing or skin. However, this also creates signal acquisition, processing, and noise suppression difficulties. To reflect different requirements, new materials, geometrical designs, and manufacturing strategies have been developed to optimize mechanical-electrical properties and device performance. In this paper, the critical progress in flexible electronic development over the last two years is selectively reviewed from materials and fractal structures perspective. Significantly, the meaning of the fractal structures for the devices and applications are analyzed in detail. Finally, this review summarizes the challenges and opportunities that fractal designs can become a key to widespread development and adoption for future research.

柔性电子作为可穿戴电子产品的一个重要分支，由于其在医疗保健跟踪、人机界面、无线通信或能量发生器等方面的广泛应用，最近引起了广泛的研究。这些电子设备灵活且体积小，可以添加到衣服或皮肤上。然而，这也会造成信号采集、处理和噪声抑制困难。为了反映不同的要求，已经开发出新材料、几何设计和制造策略来优化机械-电气特性和器件性能。本文从材料和分形结构的角度选择性地回顾了过去两年柔性电子发展的关键进展。显著地，详细分析了分形结构对器件和应用的意义。最后，本综述总结了分形设计可能成为未来研究广泛发展和采用的关键的挑战和机遇。