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  1. #1
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    Impedance Matching ADS

    Hello everybody

    I am a little confused with the smith chart matching tool.

    The source impedance is the impedance of an antenna (50 Ohms), the rectifier impedance is 20.043 +j222.779. (Zin = Vin/I_Probe1.i)

    Click image for larger version. 

Name:	QMatching.png 
Views:	11 
Size:	11.6 KB 
ID:	144027


    Click image for larger version. 

Name:	SmithChart.png 
Views:	12 
Size:	51.6 KB 
ID:	144028



    Am i doing something wrong ?

    I was expecting something near to 50 Ohms to real part, and 0 to the imaginary part...

    •   Alt18th January 2018, 02:23

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  2. #2
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    Re: Impedance Matching ADS

    Quote Originally Posted by ndequeiroz View Post
    Hello everybody

    I am a little confused with the smith chart matching tool.

    The source impedance is the impedance of an antenna (50 Ohms), the rectifier impedance is 20.043 +j222.779. (Zin = Vin/I_Probe1.i)

    Click image for larger version. 

Name:	QMatching.png 
Views:	11 
Size:	11.6 KB 
ID:	144027


    Click image for larger version. 

Name:	SmithChart.png 
Views:	12 
Size:	51.6 KB 
ID:	144028



    Am i doing something wrong ?

    I was expecting something near to 50 Ohms to real part, and 0 to the imaginary part...
    You are looking at normalized impedance values.

    0.99616*50 = 49.808 Ohms

    Uncheck the Normalize option at the top.



    •   Alt23rd January 2018, 15:52

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  3. #3
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    Re: Impedance Matching ADS

    Quote Originally Posted by BMR View Post
    You are looking at normalized impedance values.

    0.99616*50 = 49.808 Ohms

    Uncheck the Normalize option at the top.
    I know that's the normalized impedance showed in smith chart tool.

    My question is: why in my simulated circuit which the Zin(Impedance of the rectificator) is in the first image(Real and imaginary part) i dont get 50+j*0 but 25.506+j*13.420


    My Circuit
    Click image for larger version. 

Name:	Circuit.png 
Views:	3 
Size:	15.9 KB 
ID:	144127

    Input Impedance
    Click image for larger version. 

Name:	Zin.png 
Views:	4 
Size:	12.4 KB 
ID:	144128


    Thanks



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