Orientation of antennas affect simulation results

[VigneshYork]

Hello,

I have a question regarding simulating multiple antennas. I have placed 8 antennas in a circle and simulate them with a gaussian pule. Despite the 8 antennas being identitical and with only air between them, the reflection parameters are different between the antennas (shift in frequency and magntidue). What can cause this and how can I rectify it? I have attached images of the setup and the S-parameters?

And the differences in S-parameters seem to be with alterante antennas. for example antennas 1,3,5,7 (counting clockwise) are similar and antennas 2,4,6 and 8 are similar.

The brown ones are for odd antennas and yellow for even number. But all antennas are identitical

Thanks

[VigneshYork]

Could it be due to discretization? Like edges are longer when they are at an angle?

[ofli]

Hi, yes it is due to the discretization. You can compare the voxels of the dipole arms and the edge sources of, for example, dipoles # 3 and 4.

[VigneshYork]

Thanks Ofi. How can I fix this or is this something I need to account for?