Radar Cross section Vs Reflection Coefficient

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jackRF
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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
 
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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?