前言在波导元件和标准移相器二者的相移变化作比较的双臂法中,可以用最小值或零值表示来自两臂的信号在检波器上具有相反的相位。当两个信号的振幅相等时,达种相位配合可获得真正的零值。但是,如果有一个波的振幅在测量期间变化了,则只产生最小值。此值随着信号振幅之间的差值加大而变大。在测量可变衰减器的相移变化时,来自衰减器的波 Introduction In a two-arm method that compares the phase shift changes of both waveguide components and a standard phase shifter, the minimum or zero value can be used to indicate that signals from both arms have opposite phases on the detector. When the amplitudes of the two signals are equal, a true zero value can be obtained by matching the phases. However, if there is a change in the amplitude of the wave during the measurement, only the minimum is generated. This value gets larger as the difference between the signal amplitudes increases. The wave from the attenuator when measuring the change in phase shift of a variable attenuator