Li Xiangyang, Zhao Pengchao, Wang Guangyuan, Li Na, Zhang Yiqun
Key Laboratory of Electronic Equipment Structure Design, Ministry of Education, Xidian University, Xi'an 710071, China.
Micromachines (Basel). 2024 Jun 21;15(7):810. doi: 10.3390/mi15070810.
The acoustically actuated nanomechanical magnetoelectric (ME) antennas represent a promising new technology that can significantly reduce antenna size by 1-2 orders of magnitude compared to traditional antennas. However, current ME antennas face challenges such as low antenna gain and narrow operating bandwidth, limiting their engineering applications. In this paper, we enhance the bandwidth and radiation performance of ME antennas through structural optimization, leveraging theoretical analysis and numerical simulations. Our findings indicate that optimizing the inner diameter of the ring-shaped ME antenna can elevate the average stress of the magnetic layer, leading to improved radiation performance and bandwidth compared to circular ME antennas. We establish an optimization model for the radiation performance of the ME antenna and conduct shape optimization simulations using COMSOL Multiphysics. The results of the Multiphysics field optimization align with the stress concentration theory, demonstrating a strong correlation between the radiation performance and bandwidth of the ME antenna with the average stress of the magnetic film. The resonant frequency in the thickness vibration mode is determined to be 170 MHz. Furthermore, shape optimization can enhance the bandwidth by up to 104% compared to circular ME antenna structures of the same size.
声学驱动的纳米机械磁电（ME）天线是一种很有前景的新技术，与传统天线相比，它可以将天线尺寸显著减小1 - 2个数量级。然而，目前的ME天线面临着诸如天线增益低和工作带宽窄等挑战，限制了它们的工程应用。在本文中，我们通过结构优化，利用理论分析和数值模拟来提高ME天线的带宽和辐射性能。我们的研究结果表明，优化环形ME天线的内径可以提高磁性层的平均应力，与圆形ME天线相比，从而改善辐射性能和带宽。我们建立了ME天线辐射性能的优化模型，并使用COMSOL Multiphysics进行形状优化模拟。多物理场优化的结果与应力集中理论相符，表明ME天线的辐射性能和带宽与磁性薄膜的平均应力之间存在很强的相关性。厚度振动模式下的共振频率确定为170 MHz。此外，与相同尺寸的圆形ME天线结构相比，形状优化可以将带宽提高多达104%。
