I have never done it, but I know the free HFSS antenna Design Kit (ADK) has the ability to design horn antennas, and I know one can select the PML as the boundary. So you might look at generating an antenna in the ADK, then looking at the model it generates in HFSS. I also know its possible to add the PML manually or let HFSS do it for you automatically. But I can't help you any more, since I've never used it myself.
Thanks for ur reply ,But actually my problem is how PML boundary useful for SAR(Specific Absorption rate) calculation in HFSS in which horn Antenna is used as a radiating element.
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I have never done it, but I know the free HFSS antenna Design Kit (ADK) has the ability to design horn antennas, and I know one can select the PML as the boundary. So you might look at generating an antenna in the ADK, then looking at the model it generates in HFSS. I also know its possible to add the PML manually or let HFSS do it for you automatically. But I can't help you any more, since I've never used it myself.
Thanks for ur reply ,But actually my problem is how PML boundary useful for SAR(Specific Absorption rate) calculation in HFSS in which horn Antenna is used as a radiating element.
Not to state the obvious (shamelesly copying tallface65's expression), but if you have a specific issue about SAR and PML, you should have stated that at the beggining. Few, if any people reading this forum have the ability to read your mind.