seeding mesh on the radiation boundary in HFSS (2)

Dear Sir:

Thanks for your kind help!

As you said
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HFSS people say to choose boundary at minimum dustance of lambda by 4 ...the mesh length can be done using lambda by 6.....the more smaller u go...more accurate the result but more is computation time...
so lambda by 6 is better...


So mesh length on the radiation boundary should be lamda by 6. But which lamda should I choose? I simulate from 2.5GHz-18GHz, for example, if I choose lamda at 15GHz mesh length should be 3.3mm, if I choose lamda at 3GHz mesh length should be 16mm. So the difference is too distinctive, which lamda should i choose??
By the way, if I seed mesh on the radiation boundary, do you think it is also necessary to seed mesh on the metal and substrate by manual, if necessary, how long should it be?
Thank you very much!!!

Regards,