S-parameters microstrip

Discussion in 'Wireless & RF Design' started by twinsen, Aug 6, 2016.

  1. twinsen

    Thread Starter New Member

    Jul 25, 2015
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    0
    Hello, dear fellow engineers.

    I need help. Quite recently I've discovered that I do not understand S-parameters at all, and here is how it happened.
    I considered 1-port circuit physically realized as a microstrip line with open end, 90-degrees long at a certain frequenfy f0. I was trying to find S11 vs frequency, and anyway I look at it, I get a sine curve. However, this is not correct. The picture that I attached to this post shows what MATLAB thinks about all this. And this is not a sine wave.

    I'm obviously having a glitch that I cannot resolve on my own. Please someone explaing to me via an example the right way to calculate S11 for the network that I just described.

    Thank you in advance.
     
    • s11.jpg
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