The variation of dB magnitude attenuation and phase delay of reflection is uniformly proportional to distance along the 沿传输线之反射，即反向传播与正向传播电压沿传输线之相量比，其相位落后及分贝衰减沿反射方向之变化则正比于线长，相位落后为每半波长三百六十度，每米之分贝衰减为正向波或反向波单程每米之分贝衰减之两倍。