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How transform S-parameter to A-parameter

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Hidefi

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Hi.

I have a Measured S11-parameter and would like to know how can I transform it to A-Parameter. Will be used to remove the effect of the SMA conector and then the input impedance of my RFID antenna will be obtain.

Thanks in advance
 

Thanks, but in matlab, function s2abcd needs S11, S12, S21, S22 parameters. for example:

s_par=[abs(0.8413 + 0.3280i) , 0 ; 0 , 0];
Apar=s2abcd(s_par,50);

Apar =

Inf + Infi
Inf - Infi
Click to expand...
;

I have only S11, for a one port network how can I transform?

my reference "RFID Tag Antenna Design and its EM Simulation. Based Measurement Method"
 
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As i understand you have ABCD params of SMA connector. In such case, first, you should calculate input impedance of antenna with SMA
R1 = Ro(1+S11)/(1-S11), then antenna impedance without SMA would be R2 = (D*R1-B)/(A-C*R1) - if i'm not mistaken, where A,B,C,D - a params of SMA connector.
Regards.
 

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