What is the meaning of this error?
I used already two ports (PORT1 and PORT2 for input and output, respectively.
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Also when I apply the PSP analysis for S-parameter the value of maximum S21 value (4.75 dB) is much lower than the maximum power gain (17.6 dB).
while the same circuit is designed using ADS program the two values are approximately the same around (17.1 dB).