as you said:"the efficiency is smaller than 1 and so G must be lower than D" and it is clearly correct, also you said:"I find the gain is smaller than the directivity" and this is correct too, soChowChen said:I simulate a horn antenna by HFSS.But i find the gain G is smaller than the directivity D. Usually ,G=ε × D , ε is efficiency ,0<ε≤1.
Possible reasons:ChowChen said:Sorry, there is a wrong in my question.
The result of hfss is that the gain is larger than the directivity.
The result of Hfss is wrong?
Try to increase the mesh density on the radiation box surface, you can do it by assign mesh operation.ChowChen said:Hi,asdfaa
thank you for u
the material of model is pec,so it is not the first case.
how to solve the problem of 2.
There was my type error, it should be "metal loss is not considered".ifelix said:Asdfaaa said:
1. in ur simulation model, metal loss is considered
I don't understand what it means...
If I consider metal loss I have efficiency=Rrad/(Rrad+Rloss) <1. And no problem exists...
In the case of pec efficiency = 100% and so I would have G=D...
Isn't it right?