一种异频相参源的矢量网络分析仪

摘要

Vector network analyzer is a fundamental tool in the development of microwave devices and communication systems. It is very complex and usually expensive.A low⁃cost portable vector network analyzer is designed and implemented in this paper,where two frequency sources with coherent⁃phase are implemented.The signal processing is completed in the computer.The test results show that a frequency band up to 12 GHz can be tested;the dynamic range is about 100 dB below 4 GHz and about 70 dB at 8 GHz.At 4 GHz,the deviation of the amplitude is about 0.05 dB,while the deviation of the phase is about 0.1 degree.%矢量网络分析仪系统高度复杂且价格昂贵，从而难于广泛普及。设计了一款轻小实用的矢量网络分析仪，采用了异频相关源技术，使整个系统达到了相位同步，在上位机完成数据处理及显示。样机测试结果表明，此矢量网络分析仪极限工作频段达到12 GHz，动态范围最高约为100 dB，在8 GHz频段，动态范围约为70 dB。在4 GHz测试表明，幅度精度标准差优于0�05 dB，相位精度标准差优于0�1°。