Abstract The low conductivity and fragile mechanical toughness of conventional carbon material based films are major barriers for their applications in modern electronics, especially in flexible radio frequency electronics, such as antennas. In order to optimize their performance, the electrical and mechanical properties of the materials need to be improved. In this work, flexible graphite films, fabricated by high temperature thermal treatment of polymer precursor and subsequence compression rolling, are designed and explored to create dipole antennas for radio frequency applications. It is shown that the flexible graphite films with 808.8 cm2/V·sec carrier concentration have a high conductivity of 1.1 × 106 S/m. We demonstrate that the resulting flexible graphite film dipole antennas can not only produce a relatively high peak gain of 1.45 dB with comparable return loss, bandwidth, and radiation patterns to an identical copper antenna, but also have excellent structure stability and mechanical flexibility. Moreover, the density of the graphite film is 5 times less than the copper film. This indicates that the tailored flexible graphite film could be a new alternative way to produce superb flexible and efficient radio-frequency antennas.

中文翻译：

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用于射频天线的高导电性柔性石墨薄膜

摘要 传统碳材料基薄膜的低导电性和脆弱的机械韧性是其在现代电子产品中应用的主要障碍，尤其是在柔性射频电子产品，如天线中。为了优化它们的性能，需要改进材料的电气和机械性能。在这项工作中，通过聚合物前体的高温热处理和后续压缩轧制制造的柔性石墨薄膜被设计和探索，以创建用于射频应用的偶极天线。结果表明，载流子浓度为 808.8 cm2/V·sec 的柔性石墨薄膜具有 1.1 × 106 S/m 的高电导率。我们证明，由此产生的柔性石墨膜偶极子天线不仅可以产生 1 的相对较高的峰值增益。45 dB 的回波损耗、带宽和辐射模式与相同的铜天线相当，但还具有出色的结构稳定性和机械灵活性。而且，石墨膜的密度比铜膜小5倍。这表明定制的柔性石墨膜可能是生产极好的柔性和高效射频天线的新替代方法。