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How does HFSS calculate S11 internally ?

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sr2w

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Can anyone tell me in short how S11 is calculated in HFSS ? Does HFSS calculate Im(Z) and Re(Z) first and then it calculates S11. Or does it calculate S11 with the help of ratio of some voltages. If voltages then how does it calculate that ratio ?

Basically, If had lots and lots of time and I wanted to get S11 plot for a particular antenna geometry, but I want to do it with pen paper and simple scientific calculator, can anyone explain me that procedure ?
 

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