Damavandi Mohammad-Ali, Khalaj-Amirhosseini Mohammad
Electromagnetic Waves Propagation Laboratory, School of Electrical Engineering, Iran University of Science and Technology, Tehran, 1684613114, Iran.
Sci Rep. 2023 Sep 7;13(1):14698. doi: 10.1038/s41598-023-41866-z.
This paper presents an investigation of a microwave near-field power focusing (NFPF) analytical approach utilizing a cylindrical array of electric line sources along the z-axis, applicable to any arbitrary homogeneous linear medium. A novel parameter, termed the "focus ability" (FA), is introduced to quantitatively assess a method's capabilities in achieving power focusing. In the following, the phases and amplitudes of the excitation signals of the array elements are obtained with optimization to maximize FA over a certain studied area. Each stage of the theoretical analysis is supported through COMSOL full-wave simulations, ensuring the validity of the results. Theoretical results relevant to focused power are then compared to outcomes obtained from CST full-wave simulations with the same array configuration while employing half-wave dipole antenna elements with excitations obtained via optimization. These comparisons indicate that the excitation signals obtained by theoretical analysis can be used for power focusing when the array of half-wave dipole antenna sources is utilized. Furthermore, the proposed method leads to a significant reduction in the optimization time. Also, in the provided examples, the FA parameter and NFPF are investigated for the different conditions consisting of the type of the homogeneous medium and the number of antennas.
本文介绍了一种利用沿z轴排列的圆柱形电线源阵列的微波近场功率聚焦（NFPF）分析方法的研究，该方法适用于任何任意均匀线性介质。引入了一个新参数，称为“聚焦能力”（FA），以定量评估一种方法实现功率聚焦的能力。在接下来的内容中，通过优化获得阵列元件激励信号的相位和幅度，以在特定研究区域内最大化FA。理论分析的每个阶段都通过COMSOL全波模拟得到支持，确保结果的有效性。然后将与聚焦功率相关的理论结果与使用相同阵列配置的CST全波模拟结果进行比较，同时使用通过优化获得激励的半波偶极天线元件。这些比较表明，当使用半波偶极天线源阵列时，通过理论分析获得的激励信号可用于功率聚焦。此外，所提出的方法显著减少了优化时间。此外，在提供的示例中，针对由均匀介质类型和天线数量组成的不同条件，研究了FA参数和NFPF。
