Hi Abha,
If you are placing the source in a lossless medium, I think only the phase will be affected, other parameters like transmission won't be affected depending upon the location of the source. In general, it is advised to keep the source and the geometry lambda/2 distance away from the PML to avoid injection errors and also reflections from PML. What kind of PML profile are you using (the default is standard)? In peridic simulations, you can have diffrcation orders propagating at stepp angles to the PML boundaries, this can impact the performance of the PML. To reduce the effects, we generall recommend using the "steep angle" PML profile.
Regards,
Amrita
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