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The Designer's Guide Community Forum › Measurements › RF Measurements › Loss in unmatched line
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Loss in unmatched line (Read 59 times)
R. Zakai
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Loss in unmatched line
Jul 29th, 2004, 9:23am  
Hello,
Does anyone know how to estimate loss per unit length in an transmission line with standing waves (ZL=/Zr). I understand the loss is greater than the normal I2R loss for a flat (ZL=Zr) transmission line.
Rehan
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Adrian
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Re: Loss in unmatched line
Reply #1 - Jul 29th, 2004, 2:00pm  
In general, the Mismatch Loss (dB) is:
-10*log(1-|gamma load|^2)

where |gamma load| is the magnitude of the load reflection coefficient.
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R. Zakai
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Re: Loss in unmatched line
Reply #2 - Jul 30th, 2004, 9:45am  
I know that equation but is there a more comprehensive equation that also takes into account the length of the transmission line. To pose the question differently, will the loss be the same for a 0.1 meter and a 1 meter 50 ohm transmission line connected to two identical unmatched loads.

R. Zakai
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