The guard amplifier is a unity-gain amplifier with very high input impedance. 保護放大器是一個具有非常高輸入阻抗的單位增益放大器。
Finally, the curve of the relation between input and load impedance of the exponential waveguide is given and discussed. 最後,討論了指數形波導管的阻抗特性,分析了輸入阻抗與負載阻抗之間的關係。