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ZMT zurich med tech

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  4. Tuning matches for admittance but the corresponding reflection coefficient is not expected

Tuning matches for admittance but the corresponding reflection coefficient is not expected

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  • C Offline
    C Offline
    Chris Xiao
    wrote on last edited by
    #1

    Hi everyone, I faced a problem about coil tuning. I followed the official instructions from Sim4Life to tune the coil to 50ohm and the highest peak of admittance is now at the target frequency. However, when I check the reflection coefficient of each channel, it is not closed to -15~-20dB. Here are screenshots, please help me and thank you all in advance!
    admittance.PNG
    S11.PNG

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    • B Offline
      B Offline
      brown
      ZMT
      wrote on last edited by
      #2
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      • B Offline
        B Offline
        brown
        ZMT
        wrote on last edited by
        #3

        If you click on Network Analysis in your Analysis tree, what is your Reference Impedance?

        It is set to 50 ohms by default, but you have change it based on the Input Impedance for the coil before plotting the S11 curve.

        Plot the complex Input Impedance. At resonance, the imaginary part will be zero (the circuit is purely resistive). So at the desired resonant mode / frequency, you should find the corresponding real value, and set this value as the reference impedance to plot |S11|.
        image.png
        6f536c46-f9f2-4d5a-b787-cfdb97521404-image.png
        5730b440-37ea-4190-824e-1fac4e45155a-image.png

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        • SylvainS Sylvain has marked this topic as solved on
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