I am designing a reflectarray unit cell in HFSS, I am using Floquet port for excitation purposes.

I have a couple of questions related to Floquet port modes

1. I want to use TE10 mode for excitation. I have used the Mode calculator to determine the modes. From the mode calculated it is found that TE10 mode is the 10th mode, how I can choose this mode. Because when I check TE10 mode for mesh refinement, I give unexpected results ( more than +20 dB valueS for return loss for different 'incident angles)

2. The mode calculator also gives some negative modes like TE-11, TM-11, TE0-1, etc/ What are these modes, and how we interpret them.

Thanks in advance

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