Creating a Smith Chart with load impedance only

Hello,

I'm currently working on generating a Smith chart and utilizing it to determine the reflection coefficient using MATLAB. The only information I have is the load impedance (ZL). I've attempted the following code, but it doesn't work and Smithplot needs more information:

ZL = 3; % Normalized 

figure;
smithchart;

addSmithMarker(ZL, 'o', 'Load Z_L = 3\Omega');

Can someone please help?

Thank you in advance.

Answer 1

[Sam Chak]

Hi @Adham Elkhouly

I'm not well-versed with plotting Smith Chart. But starting R2023b, the smithplot() function replaces the smithchart() function. For details, check out the documentation at this link:

https://www.mathworks.com/help/antenna/ref/smithplot.html

amp = read(rfckt.amplifier,'default.s2p');
Sa  = sparameters(amp);
Ya  = yparameters(Sa);
smithplot(Ya, 2, 2)