About S-parameter definition in Spectre

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Julian18

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Hi, there
Question about the s-param definition of spectre.
In one of the cds application notes, it says: spectre normalizes the LNA scattering mattrix with respect to the source and load port resistance. Therefore, the source reflection coefficient Γ_s and Γ_l are both zero.
I dont understand this statement. can anyone here give me a explaination or,if possible, give me a brief derivation.

TIA.

Added after 4 hours 8 minutes:

any suggestions??
 

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