Performance Comparison of Near-Field Focused and Conventional Phased Antenna Arrays at 140 GHz
Performance Comparison of Near-Field Focused and Conventional Phased Antenna Arrays at 140 GHz
复制标题
140 GHz 近场聚焦天线阵列与传统相控天线阵列的性能比较
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
M. Berg
中科院分区：
文献类型：
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作者：
Dinesh Acharya;J. Kokkoniemi;A. Pärssinen;M. Berg
未来的高频系统需要非常高的天线增益来科普大的信道损耗。为了获得大的增益和灵活的波束形成，通常考虑大型天线阵列。由于有数百或数千个天线元件，发射能量高度集中在目标上。然而，大量的天线元件使得天线与波长相比非常大。因此，用户很可能处于阵列的近场中。在该区域中，通过将能量聚焦在期望位置上来获得最大天线增益。缺点是需要知道无线电的确切位置。重点分析了传统的线性相位波束控制和近场聚焦波束控制，以及用户位置不确定性对天线增益的影响。用户位置的不确定性可能例如由于用户移动性而出现。结果表明，近场聚焦在天线阵列的近场提供了上级增益，但比线性相位波束控制对用户位置信息更敏感。
The future high frequency systems require very high antenna gains to cope with the large channel losses. In order to obtain large gain and flexible beamforming, large antenna arrays are often considered. With hundreds or thousands of antenna elements, transmit energy is highly concentrated on the target. However, large numbers of antenna elements make the antennas very large compared with the wavelength. Therefore, it is likely for the user to be in the near field of the array. In this region, the maximum antenna gain is obtained by focusing the energy on the desired locations. The downside is a need to know the exact locations of the radios. This paper focuses on analysis of the traditional linear phase beam steering and near field focusing beam steering and the impact of the user location uncertainty on the achievable antenna gain. The uncertainty in the user location can arise, for instance, due to user mobility. The results show that the near field focusing gives superior gain in the near field of the antenna array, but is more sensitive to the user location information than the linear phase beam steering.