It mentioned that there's a factor 2 in S21 value.
But I'm still don't understand why there's a 2 in it.
My schematic is shown below.
Shouldn't S21 = Vout/Vgen?
My question is: where is the impedance that caused a factor of 2 in above circuit?
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\$\begingroup\$ "factor 2" in a search of the referenced post found no matches. \$\endgroup\$– Andy akaCommented Jun 27 at 8:48
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\$\begingroup\$ Sorry, I referenced the wrong page and have corrected it \$\endgroup\$– Jack HuangCommented Jun 27 at 9:05
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1\$\begingroup\$ Hint: suppose you replace your DUT with a simple wire from port 1 to port 2. What should \$S_{21}\$ be? What do you measure for \$V_{out}/V_{gen}\$? Do you understand why? \$\endgroup\$– The PhotonCommented Jun 27 at 15:07
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\$\begingroup\$ @ThePhoton Ok, now I understand what causes the reason behind the factor of 2. I have seen this post before: electronics.stackexchange.com/questions/550000/…. Is it the same concept too? \$\endgroup\$– Jack HuangCommented Jun 28 at 1:43
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\$\begingroup\$ Yes, that's the same concept. \$\endgroup\$– The PhotonCommented Jun 28 at 17:08
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