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AD9680的S参数仿真文件,里面有8个文件,分别代表什么?

如题,

文件内容都是以下列开头

!Agilent Technologies,N5230A,MY45000942,A.07.12.01
!Agilent N5230A: A.07.12.01
!Date: Wednesday, January 22, 2014 13:45:37
!Correction: S11(Full 2 Port(1,2))
!S21(Full 2 Port(1,2))
!S12(Full 2 Port(1,2))
!S22(Full 2 Port(1,2))
!S2P File: Measurements: S11, S21, S12, S22:
# Hz S dB R 50

我想请问专家们,这8个文件分别代表什么情景S参数? port1和port2是指AD9680的模拟端口的那个引脚