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PML or Radiation for finding the gain of a folded dipole

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hapciu

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hi,
I'm simulating a folded dipole. I'm trying to find the gain. I'm using diffrent boundary conditions: PML or Radiation. My structure is very large so, I tried the symmetry+PML, symmetry+Radiation, pec+pml, pec+radiation.
all this should give me simmilar results. but I get a different gain, with pml or radiation (so, the entire structure) I get a gain of 3.3dB, which is wrong.
could someone give me some advice? what kind of boundary conditions should I choose?
thanks
 

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