Radar Cross section Vs Reflection Coefficient

[jackRF]

I am working on HFSS and designing Antennas for LOW RCS , in all previous works they calculate the S11 parameter for the unit cell then make an array form this unit cell and calculate the RCS , my question is what is the relation between S11 and RCS and why we calculate S11 for the unit cell only and if i modify the unit cell's S11 it will improve the RCS or not

 

[berkeman]

Welcome to the PF.

Is this question for schoolwork or for regular work?

 

[jackRF]

regular work

 

[berkeman]

Thanks. I'll move it to the EE forum. Can you say more about the project? Why are you concerned about the radar cross-section of the antenna? What type of antenna is it, and what is the frequency range of the HFSS signal?