Learning Forum

[sornakumarrr]

Hello I am learning how to use HFSS and am trying to replicate a metasurface. The metasurface is designed for circular polarization so I am using floquet ports to simulate a unit cell. I turned on TE mode and also TM mode but with 90 degree phase in edit sources so that it would create a circularly polarized mode. Where I am having trouble is how to read the s parameters for the circularly polarized mode?

 

[Guilin Sun]

Hi This is Photonics forum. Please submit your question to HFSS forum https://innovationspace.ansys.com/forum/forums/topic-tag/ansys-hfss/

In Lumerical FDTD, once you use ports you can automatically get S parameters. However currently the port does not use circular polarization source. You will need to do two simulaitons and combine the S results, if you use Lumerical FDTD. Ports are mainly used for waveguide modes.

[sornakumarrr]

Thank you, i will follow your instruction

[sornakumarrr]

Could you please explain how to combine the S11 parameters of TE and TM modes to determine the CP S11 parameter?

[Guilin Sun]

 

This is more of math/physics questions. Suppose you use Ex,Ey as sources respectively, you get Sx and Sy. If you use Ex+jEy as the circular polarization, the result will be Sx+jSy. Please verify.

You may need to normalize the result with sqrt(2)/2.

 

 

[sornakumarrr]

Thanks for the suggestion