I am new to antenna and RFID. I recently designed and made a RFID dipole antenna and would like to see the impedance change at certain frequencies.
I have obtained S matrix parameters s2p file using VNA and all four S parameters (including real and imag) can be seen. Since the complex impedance needs to be calculated using the following equation:
Zd=2*Z0*(1-S11^2+S21^2-2S12)/((1-S11)^2-S21^2), where Z0=50 Ohm.
I tried to plot Zd in EXCEL but it couldn`t handle four complex number operations, hence returning errors.
I then tried MATLAB but the results was very odd. I finally asked a friend of mine to plot using Keysight ADS which got the correct results.
From my side, I don`t have Keysight ADS. I would like to plot Zd using either EXCEL or MATLAB.
Anyone knows the correct way or even more convenient way to do the calculation?
I didn't find the right solution from the internet.
http://www.antenna-theory.com/phpbb2/vi ... php?t=1212
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