由于超远雷达、仪器、通讯、电视的发展和普及都需要在500MH_z附近测量各种非金属材料的基本电参数—介电系数ε_r和损耗角正切tanδ。国内目前大都采用同轴测量线按驻波法进行测量,被测样品要做成圆环状,且样品上的孔必须与同轴线的内导体紧密配合,否则会导致测量上的严重误差。这种系统所需的仪器价格昂贵,计算时公式复杂。所以,一般工 Due to the development and popularization of ultra-long-range radar, instruments, communications and television, it is necessary to measure the basic electrical parameters of various non-metallic materials, such as dielectric constant ε_r and loss tangent tan δ, around 500 MHz. At present, most of the coaxial measurement lines are used to measure by standing wave method. The sample to be measured should be made into a ring shape, and the holes on the sample must be closely matched with the inner conductor of the coaxial line. Otherwise, serious errors in measurement will result. The instruments required for such a system are expensive and the formulas are complex when calculated. So, general workers