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Re: S21 is less than zero when designing a AsGa PA,is all ri
When S21 (dB) is below 0 you have an Attenuator not an Amplifier.
But your design has no sort of matching input or out put, so you are
basically seeing the S-Parameters.
Plot S11 & S22 on a Smith chart and find their values at 2.4GHz.
Then put the Conjugate of those Impedance as matching networks
and you should get a lot more gain. But if this is a PA you will need
to match the Output for Max Power and not Gain (typically a lower impedance).
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