Parametar S21 on VNA?

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Malcolm White

It means the log magnitude (LM) is -5.6 dB, or that just over 1/4 of the signal power from the first antenna is received by the second antenna at that frequency. -6.02 dB is 1/4 power. If you don't know dB look up decibels on wikipedia. dB always refers to a power ratio.

Josipa Lovric

Okay, thank you. So what is better result in this 2 cases?

-11.77 dB is about 6.6%. -5.6 dB is 27.5%. Which is better?