作者：栾鹏1, 王一帮1, 杜静2, 霍晔1, 吴爱华1
作者单位：1. 中国电子科技集团公司第十三研究所, 河北 石家庄 050051;
2. 解放军陆军步兵学院石家庄校区, 河北 石家庄 050083
针对大反射负载牵引测量过程中，由于矢网系统误差导致的负载牵引测量误差较大问题，提出可行的解决方案。首先，以矢网8项系统误差模型为基础，推导出大反射负载牵引功率增益测量模型。以直通线功率的增益误差和为目标函数，通过优化阻抗点分布、重新构建优化权重函数，实现大反射负载牵引测量准确度的进一步提高。经优化比较，在8 mm频段（负载反射系数模值0.9），系统测量直通线功率增益的最大误差由±1 dB优化到±0.2 dB以内（国内文献报道±0.3 dB），进一步提高在片大反射负载牵引系统测量准确度。此外，通过比较分析，明确反射跟踪误差是影响大反射负载牵引测量准确度的主要系统误差项。
Research on improving the accuracy of large reflective load-pull measurement
LUAN Peng1, WANG Yibang1, DU Jing2, HUO Ye1, WU Aihua1
1. The 13th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang 050051, China;
2. Shijiazhuang Division of PLA Infantry Academy, Shijiazhuang 050083, China
Abstract: In order to solve the problem of the large deviation of load-pull measurement caused by the error of the vector network system in the process of load-pull measurement for large reflection coefficient, a feasible solution was presented. Firstly, based on the system error model of the vector network, the power gain measurement model of large reflective load-pull system was conducted. Next, the straight line power gain error sum was set as the objective function in the model. Simultaneously, the impedance point distribution was optimized and the optimized weight function was reconstructed. As a result, the accuracy of load-pull measurement of large reflection coefficient was further improved. After a series of optimizations and comparison, the maximum deviation of the system measurement straight-line power gain was reduced from ±1 dB to within ±0.2 dB in the 8 mm frequency band (load reflection coefficient magnitude value of 0.9), which was ±0.3 dB in domestic literature reports. In addition, through comparative analysis, it is clearly concluded that reflection tracking error is the main system error term that affects the accuracy of load-pull measurement with large reflection.
Keywords: load-pull;large reflection;error term;optimization weight function;accuracy
2020, 46(6):147-151 收稿日期: 2019-11-25;收到修改稿日期: 2019-12-26
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