Islam Sikder Sunbeam, Faruque Mohammad Rashed Iqbal, Islam Mohammad Tariqul
Centre for Space Science, Research Centre Building, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
Materials (Basel). 2015 Jul 29;8(8):4790-4804. doi: 10.3390/ma8084790.
The paper reveals the design of a unit cell of a metamaterial that shows more than 2 GHz wideband near zero refractive index (NZRI) property in the C-band region of microwave spectra. The two arms of the unit cell were splitted in such a way that forms a near-pi-shape structure on epoxy resin fiber (FR-4) substrate material. The reflection and transmission characteristics of the unit cell were achieved by utilizing finite integration technique based simulation software. Measured results were presented, which complied well with simulated results. The unit cell was then applied to build a single layer rectangular-shaped cloak that operates in the C-band region where a metal cylinder was perfectly hidden electromagnetically by reducing the scattering width below zero. Moreover, the unit cell shows NZRI property there. The experimental result for the cloak operation was presented in terms of S-parameters as well. In addition, the same metamaterial shell was also adopted for designing an eye-shaped and triangular-shaped cloak structure to cloak the same object, and cloaking operation is achieved in the C-band, as well with slightly better cloaking performance. The novel design, NZRI property, and single layer C-band cloaking operation has made the design a promising one in the electromagnetic paradigm.
本文揭示了一种超材料单元结构的设计，该结构在微波频谱的C波段区域展现出超过2 GHz的宽带近零折射率（NZRI）特性。单元结构的两个臂以一种在环氧树脂纤维（FR - 4）基板材料上形成近π形结构的方式进行分割。通过使用基于有限积分技术的模拟软件获得了单元结构的反射和传输特性。给出了测量结果，其与模拟结果吻合良好。然后将该单元结构应用于构建一个单层矩形隐身衣，该隐身衣在C波段区域工作，通过将散射宽度减小到零以下，金属圆柱体在电磁上被完美隐藏。此外，该单元结构在那里呈现出NZRI特性。还给出了隐身衣工作的以S参数表示的实验结果。此外，同样的超材料外壳也被用于设计眼形和三角形隐身衣结构来隐藏同一物体，并且在C波段实现了隐身操作，隐身性能略有提升。这种新颖的设计、NZRI特性以及单层C波段隐身操作使得该设计在电磁领域具有广阔前景。
