Photonics-Based Near-Field Measurement and Far-Field Characterization for 300-GHz Band Antenna Testing
Photonics-Based Near-Field Measurement and Far-Field Characterization for 300-GHz Band Antenna Testing
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用于 300 GHz 频段天线测试的基于光子学的近场测量和远场表征
DOI：
10.1109/ojap.2021.3133470
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发表时间：
2022
影响因子：
4
通讯作者：
S. Hisatake
中科院分区：
文献类型：
--
作者：
Yusuke Tanaka;G. Ducournau;C. Belem;F. Gianesello;C. Luxey;I. Watanabe;A. Hirata;N. Sekine;A. Kasamatsu;S. Hisatake
在这项研究中，使用具有平面扫描功能的电光 (EO) 传感器演示了 300 GHz 频段中基于光子学的近场测量和远场表征。待测场在 EO 传感器处上转换为光域 (1550 nm)，并通过光纤传送至测量系统。对于13 s的一维测量时间，系统的典型相位漂移为0.46°，小于该时间尺度的相位测量的标准偏差1.2°。将根据测量的近场分布计算出的喇叭天线的远场方向图与使用矢量网络分析仪通过直接远场测量系统测量的方向图进行比较。对于与角度相关的参数，我们的近场测量获得的结果的精度与直接远场测量获得的结果的精度相当。基于我们的近场测量获得的结果与直接远场测量获得的结果之间的旁瓣电平差异（大约1 dB）归因于探头校正数据的过多噪声。我们相信，基于光子学的近场测量和球形 EO 探头扫描将为 300 GHz 频段高增益天线的表征铺平道路。
In this study, photonics-based near-field measurement and far-field characterization in a 300-GHz band are demonstrated using an electrooptic (EO) sensor with planar scanning. The field to be measured is up-converted to the optical domain (1550 nm) at the EO sensor and delivered to the measurement system with optical fiber. The typical phase drift of the system is 0.46° for the one-dimensional measurement time of 13 s, which is smaller than the standard deviation of the phase measurement of 1.2° for this time scale. The far-field patterns of a horn antenna calculated from the measured near-field distribution are compared with that measured with the direct far-field measurement system using a vector network analyzer. For the angular related parameters, the accuracy of the results obtained by our near-field measurement are comparable to that of those obtained by direct far-field measurements. The sidelobe level discrepancy (approximately 1 dB) between the results obtained based on our near-field measurement and those from the direct far-field measurements are attributed to the excess noise of the probe correction data. We believe that photonics-based near-field measurements with spherical EO probe scanning will pave the way for the characterization of high-gain antennas at the 300-GHz band.