论文标题
近场区域的宽带概括，用于极大的相分阵阵列
A wideband generalization of the near-field region for extremely large phased-arrays
论文作者
论文摘要
传统无线系统设计中的窄带和远场假设导致与宽带和近场系统所需的最佳光束形成的不匹配。对于较大的孔径和带宽，这种差异会加剧。为了表征近场和宽带系统的行为，我们得出了通过设计用于平面波传播的频率 - 平台阶段阵列实现的光束形成增益表达。为了确定宽带系统的远场到近场边界，我们提出了频率选择距离度量。拟议的远场阈值增加了远离中心频率的频率。该分析导致阵列孔和系统带宽的乘积产生基本的上限。我们提出数值结果，以说明增益阈值如何影响N260和N261 5G NR频段的最大可用带宽。
The narrowband and far-field assumption in conventional wireless system design leads to a mismatch with the optimal beamforming required for wideband and near-field systems. This discrepancy is exacerbated for larger apertures and bandwidths. To characterize the behavior of near-field and wideband systems, we derive the beamforming gain expression achieved by a frequency-flat phased array designed for plane-wave propagation. To determine the far-field to near-field boundary for a wideband system, we propose a frequency-selective distance metric. The proposed far-field threshold increases for frequencies away from the center frequency. The analysis results in a fundamental upper bound on the product of the array aperture and the system bandwidth. We present numerical results to illustrate how the gain threshold affects the maximum usable bandwidth for the n260 and n261 5G NR bands.
