Ali Md Yeakub, Lalbakhsh Ali, Koziel Slawomir, Golunski Lukasz, Ahmed Foez, Asadnia Mohsen
School of Engineering, Macquarie University, Sydney, NSW, 2109, Australia.
Engineering Optimization & Modeling Center, Department of Engineering, Reykjavik University, Reykjavik, Iceland.
Sci Rep. 2024 Aug 2;14(1):17930. doi: 10.1038/s41598-024-68583-5.
In order to increase the radiation performance of aperture-type antennas, this paper demonstrates a low-profile, planar, single-layer, three-dimensional (3-D) printable metastructure. The proposed hybridized metastructure is highly transparent as it is made out of novel hybrid meta-atoms having transmission coefficient magnitudes greater than - 0.72 dB and fully complies with the near-field phase transformation principle. The hybridized design approach makes the metastructure planar, low-profile, light in weight, and compatible with additive printing technology. For the proof-of-concept, such metastructure is developed and numerically verified to enhance the radiation performance of a resonant cavity antenna (RCA). With the proposed metastructure, the peak directivity of the RCA is improved by 8.6 dBi (from 11.4 dBi to 20 dBi) at the operating frequency of 12.4 GHz. The aperture efficiency and 3-dB directivity bandwidth of the RCA with the metastructure are 41.46% and 16.5%, respectively. Using readily accessible thermoplastics or polymers and copper with cost-effective fused deposition modeling (FDM) 3-D printing technology, the proposed planar hybridized metastructure can be prototyped commercially.
为了提高孔径型天线的辐射性能，本文展示了一种低剖面、平面、单层的三维（3-D）可打印超材料结构。所提出的混合超材料结构具有高度透明性，因为它由新型混合元原子制成，其传输系数幅度大于 -0.72 dB，并且完全符合近场相位变换原理。这种混合设计方法使超材料结构具有平面、低剖面、重量轻的特点，并且与增材打印技术兼容。为了进行概念验证，开发了这种超材料结构并通过数值验证，以增强谐振腔天线（RCA）的辐射性能。在所提出的超材料结构的帮助下，在12.4 GHz的工作频率下，RCA的峰值方向性提高了8.6 dBi（从11.4 dBi提高到20 dBi）。带有该超材料结构的RCA的孔径效率和3-dB方向性带宽分别为41.46%和16.5%。使用易于获取的热塑性塑料或聚合物以及铜，通过具有成本效益的熔融沉积建模（FDM）3-D打印技术，可以将所提出的平面混合超材料结构商业化制作成原型。
