Port 1
Port 2
S Parameters
(Scattering Parameters)
S11
S21
S22
S12
Input Reflection Coefficient
(when match output impedance to Zo)
Forward Gain
|S21|2 is insertion power gain
(when impedances matched to Zo)
Output Reflection Coefficient
(when match input impedance to Zo)
Reverse Gain
With perfect Isolation, S12=0
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