In Reply to: Impedance matching transformer and Return loss posted by Abbas on 08/15/01 at 9:17 PM:
Please take a look at http://www.mogami.com/e/cad/vswr.html for a definition of return loss and then at http://www.testeq.com/charts/vswrconv.lasso for some nice tabulations.
What return loss means, from an intutive sense is how small a reflected signal on a transmission line will be compared to the incident signal. If the transmission line is perfectly and ideally matched to the load so that the standing wave ratio is 1:1, there will be no reflected signal at all and the return loss will be infinity.
John Dunn - President