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How to simulate circularpolarization in CST

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sangwoo

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Hi everyone,
I would like to ask for help. I have a problem about how to generate circular polarization (RCP and LCP) for the periodic structure as metamerials by CST. Generally, I simulate the structure by waveguide port and set boundary conditions as follows: Htan=0 in z direction, Etan=0 in y direction, and open in x direction. The propagating wave is traveling through x direction which is the left side of structure plane. Now, I study about the twisted structure, so I want to calculate circular polarization (RCP and LCP) of transmission coefficient (T_LCP and T_RCP) ,and S21&S11 too. Could you please advise and teach me how to simulate this structure?

Best regards,
Sangwoo
 

Hai u just simulate the structure with open(addspace) in all side before that u go to far field monitor and set ur frequency and click farfiled button in there. After the simulation finished in the farfiled result field u can see the rcp and lcp automatically
 

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    sangwoo

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Hi Jamesanton, I had already do following your advice, but it did not work. There are not s-parameter of RCP and LCP. It shown that because of parallel symmetry plane of waveguide port, so no far field calculation possible. Could you explain me thoroughly please?
Thanks in advance
 

hi sangwoo,
firstly, you must set the boundry condition in Open Add Space in all direction. then if its not work, might be there is problem in your port.
 

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    sangwoo

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Hi all, Thanks a lot. It is quite work because it now obtains Far field results (RCP and LCP). But I'm afraid that this method will make the structure not been periodic structure. Could you suggest this and further step please?
Very thanks
 

Hi all, By the way from this question for a while, I have a new question in Frequency domain of CST.
Could anyone please tell me If I want to simulate TEM mode in Frequency domain, what should I do ?
Because I have seen only TE and TM mode when I set floquet port.

Best regards,
Sangwoo
 

Dear All,
I need information how to simulate S-parameter LCP and RCP in cst too. Should I use either floquet port or plane wave excitation? However, how I can calculate S-Parameter LCP and RCP because by default CST just calculates the S-11 or S-12 ... Thanks in advance.

Regards
 

This is the same problem that I am having. Can you please post your .cst file or matlab code? As you know, CST does a very poor job at putting examples on their website, so any help from you guys would be greatly appreciated.
 

for periodicity of metamaterial i use periodic boundary condition in both x and y direction and open add space in the z direction . you can select in floquet port mode list to pick LCP and RCP. but still what i got in the s parameter folder is s11 and s21 which from the result i guess is not LCP and RCP transmission and reflection . that s11 and s21 is for TE and TM. there is a way to find the LCP and RCP transmission. if you find a solution let me know.
 

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