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I was thinking of this a little more: when the reflected wave travels down the line, at least at the beginning moment, it is seeing the input impedance as the characteristic impedance of the transmission line.
Thank you FvM for comments. Using characteristic impedance for calculation does not make sense.
Just wondering why most textbook are not giving a more general case of using zin1 and zin2? What is up with that?
For the structure in attached picture, should the Gama (reflection coefficient)=(Zin2-Zin1)/(Zin2+Zin1)?
I was wondering if it is Gama=(Zo2-Zo1)/(Zo2+Zo1), but I highly doubt it is the correct one to use.
It is the input impedances looking into each side that really matter. But I cannot think...
Zorro, thank you for the nice comments! These rules of thumb are very handy.
I did some quick calc, for 6dB, needs to add .97dB; for 12dB, needs to add 0.27dB.
Thank you Keith and every one for the input and verification.
I have a few more comments for discussion:
1.) To have absolute power expressed in dBm does provide conveinence. The conveinence lies in the fact that it can be directly added with dB (for gain budget etc.) While using mW or Watts...
Thank you Keith for the insight.
I guess dBm should be always considered as absolute value, rather than a ratio, despite of the fact dBm is really referencing to 1mW. dBm=10log(signal_power/1mW). It sounds like a ratio similar to dB, but it is really not.
dB and dB can be directly added up together; so is dB and dBm.
However, dBm and dBm can not be directly added up. They need to be converted to linear unit first, added up, then converted back to dBm. This is the correct way to do, but anyone can provide some insight on the reasoning for this?
I really like your update and remark. I went through what you did and was able to verify its correctness.
if we increase Vb to a large number, surely the limit of S will be 1. In reality, Vb is not able to go too far before the device is damaged.
For the Rb=0 case, even relative sensitivity is...
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