Free-Space Phased-Array Characterization and Calibration Using Code-Modulated Embedded Test
Free-Space Phased-Array Characterization and Calibration Using Code-Modulated Embedded Test
复制标题
使用代码调制嵌入式测试进行自由空间相控阵表征和校准
DOI：
10.1109/mwsym.2019.8701098
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
B. Floyd
中科院分区：
文献类型：
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作者：
Zhangjie Hong;Simon Schönherr;Vikas Chauhan;B. Floyd
一种相控阵自测试技术称为代码调制嵌入式测试（CoMET）是用于自由空间特性和校准的相控阵天线封装收发器。正交两位调制被施加到所有移相器，以允许使用简单的功率检测器并行提取阵列元件的增益和相位。我们的阵列使用两个商用波束形成器和贴片天线阵列。在10 GHz时，与网络分析仪测量结果相比，CoMET提取的增益、相位和相位偏移精确到0.4 dB和4°以内。然后在校准环路内使用CoMET来均衡阵列上的元件增益和相位，以获得7位相位分辨率。校准后，元件之间的最大增益和相位偏移从3.5 dB和70°减小到1.1 dB和~0°。校准后的自由空间光束模式显示出显着的改善。
A phased-array self-test technique called code-modulated embedded test (CoMET) is used for free-space characterization and calibration of phased-array transceivers packaged with antennas. Orthogonal two-bit modulation is applied to all phase shifters to allow for parallel extraction of gain and phase of array elements using a simple power detector. Our array uses two commercially-available beamformers and a patch antenna array. At 10 GHz, CoMET-extracted gain, phase, and phase offset are accurate to within 0.4 dB and 4° compared to network analyzer measurements. CoMET is then used within a calibration-loop to equalize elemental gain and phase across the array for 7-bit phase resolution. After calibration, the maximum gain and phase offsets between elements are reduced from 3.5 dB and 70° to 1.1 dB and ~0°. Free-space beam patterns after calibration show significant improvement.