Module 2
:
Transmission Lines
Lecture
6 : Loss Less Transmission Line
Return Loss & Reflection Co-efficient
The return loss is defined as
Return loss (RL) = -20 log
dB
The return loss indicates the factor by which the reflected signal is down compared to the incident signal.
For perfect match
and the return loss is
, whereas for the worst case of
the return loss is 0 dB
Higher the return loss better is the match.
For acceptable value of VSWR = 2,
The return loss should be higher than 9.54
1
2
3
4
5
6
and the return loss is
, whereas for the worst case of
the return loss is 0 dB 
