基于矢量网络分析仪的喇叭天线增益测量

Horn Antenna Gain Measurement Based on Vector Network Analyzer

利用微波暗室、矢量网络分析仪、角锥喇叭天线以及电脑等设备建立了一套喇叭天线测量系统;采用两相同天线法,分别测量了4~6 GHz、6~8 GHz角锥喇叭天线的增益值,对测量数据进行误差分析和近距修正;并将增益的实测值与理论计算值进行对比。实验结果表明,近距修正后,所测量的4~6 GHz与6~8 GHz频段天线的增益实测值与理论值的最大偏差值分别为-0.20 d B和-0.19 d B,均在±0.25 d B范围内,符合标准增益天线增益的精度要求,也与天线出厂的指标相符,表明所建立的测量系统对于喇叭天线增益的测量有效可行。

A set of horn antenna measurement system was set up by microwave anechoic chamber, vector network analyzer, computer and other equipment. The pyramidal horn antenna gain of the two horn antennas which were 4～6GHz and 6～8GHz were measured by the two same antenna method, at the same time, making error analysis and correction of near distance measurement data, and then compared the theoretical calculation value with the measured value of gain. The experimental results show that, after correction of near distance measurement, the maximum deviation of the measured and theoretical values are respectively as -0.20dB and -0.19dB, and they are within 0.25dB. The results are consistent with the requirements of standard gain antenna and manufacture index, and also show that the measurement system established measurement for horn antenna gain is effective and feasible.