The guard amplifier is a unity-gain amplifier with very high input impedance. 保护放大器是一个具有非常高输入阻抗的单位增益放大器。
Finally, the curve of the relation between input and load impedance of the exponential waveguide is given and discussed. 最后,讨论了指数形波导管的阻抗特性,分析了输入阻抗与负载阻抗之间的关系。