s11 s21 s22

How to convert S11and S22 to complex impedance喔天呀...這不是胖虎~~~!!! Dear all. I'm a new comer, i wish to learn alot from you. I have designed a PA module using BLF278. but datasheet only give me S11,S12.S21.S22 and I need convert to Zin and Zout in complex impedance. (or how to use S-paramter) Please help me Thanks...

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