Department of Physics and RINS, Hanyang University, Seoul, South Korea.
Department of Display Information, Sunmoon University, Asan, South Korea.
Sci Rep. 2017 Mar 22;7:45151. doi: 10.1038/srep45151.
An efficient resolution for ultrathin metamaterial perfect absorber (MPA) is proposed and demonstrated in the VHF radio band (30-300 MHz). By adjusting the lumped capacitors and the through vertical interconnects, the absorber is miniaturized to be only λ/816 and λ/84 for its thickness and periodicity with respect to the operating wavelength (at 102 MHz), respectively. The detailed simulation and calculation show that the MPA can maintain an absorption rate over 90% in a certain range of incident angle and with a wide variation of capacitance. Additionally, we utilized the advantages of the initial single-band structure to realize a nearly perfect dual-band absorber in the same range. The results were confirmed by both simulation and experiment at oblique incidence angles up to 50°. Our work is expected to contribute to the actualization of future metamaterial-based devices working at radio frequency.
本文提出并验证了一种用于甚高频无线电频段（30-300MHz）的超轻薄超材料完美吸收体（MPA）的高效解决方案。通过调整集总电容器和贯穿垂直互连，将吸收体的厚度和周期性分别缩小到工作波长（在 102MHz 时为 λ/816 和 λ/84）的 1/816 和 1/84。详细的模拟和计算表明，在一定的入射角范围内和电容变化较大的情况下，MPA 可以保持超过 90%的吸收率。此外，我们利用初始单频结构的优势，在相同频段内实现了近乎完美的双频吸收体。实验和模拟结果均证实了在 50°以内的斜入射角下的性能。我们的工作有望为未来基于超材料的射频器件的实际应用做出贡献。
