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Operations on S parameters - value of angle

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Eres_89

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Hi,

I need informations about mathematical operations related to scattering parameters. For instance, I'm calculating stability of amplifier. To do that, I'm using well known equation:
K.png

And my question is: how can I easily calculate angle of delta ?
Example:
S11.png
How this -162° has been calculated ? It is easily operation or I need use for instance smith chart ?

Best Regards,
Ed
 

Don't you know ho to calculate complex numbers ??
cmplx.png
 
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