In a reflection, a signal part is reflected by an impedance difference. Since the impedance is generally frequency-dependent, this means that the reflection is also frequency-dependent. The smaller the impedance differences are, the smaller the reflections are. If the impedances are completely identical, no reflections will occur.
The reflection attenuation is given in decibels( dB) and is the logarithmic ratio between the reflected signal and the input signal. The reflection loss (are) is given by: `are = 10 log * (Pre)/(Pei)`; where Pre is the reflection power and Pei is the input power. This reflection attenuation is, for example, a criterion for matching a data socket to the data cable. The greater the reflection attenuation, the better the impedance matching of the components.