矢量网络分析仪属于台式仪器中性能最高和价位亦高的仪器,能够生产矢量网络分析仪的仪器公司也屈指可数,产品种类齐全的实际上只有Agilent和Anritsu两家,可见矢量网络分析仪的生产确有相当难度。网络特性测量又是电路设计不可缺少的参数,晶体管往往用不同的四端网络等效参数来代表,早期采用阻抗参数,例如至今仍然通用的是输入阻抗和输出阻抗,接着又有纳导参数、混合参数,后来最通用的是S参数,现在矢量网络分析仪都有S参数的测量 Vector network analyzer belongs to the highest performance and high price instruments in desktop instruments. There are also a few instruments companies that can produce vector network analyzers. In fact, there are only two Agilent and Anritsu products, which can be found in Vector Network Analyzer Production is quite difficult. Network characteristics measurement is an indispensable parameter in circuit design. Transistors are usually represented by different four-terminal network equivalent parameters. Impedance parameters are adopted at an early stage. For example, input impedance and output impedance are still common until now, Mixed parameters, then the most common is the S parameters, and now the vector network analyzer has S parameters of the measurement