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Input and output impedances of transmission line

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Eres_89

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Hi All,

I've simple question related to the transmission line theory. Let we say, that we have such line which has Z0=35.35Ω, with electrical length equal to 90°, and it's terminated by the ports of 50 Ω. I'm wondering why in AWR simulator input and output impedances of the TL are equal to 25 Ω. According to quarter wave equation, I should obseve value of 35.35 Ω (when Zin = Zout).

S1.png

Best Regards,
E.
 

Eres_89 said:
According to quarter wave equation, I should obseve value of 35.35 Ω (when Zin = Zout).
Click to expand...
Simply you can not understand basic theory at all.
Surely relearn with kindergarten level text book.

Zin=R0*R0/Zload=35.35*35.35/50=25
 

Start to sweep the length from 0 to 180 degree, you'll observe that when the TL's length arrives to 90 degree, the real axis will show you 25 Ohm.
smith_sweep1.pngsmith_sweep.png
 

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