Can anyone please help me to explain the nyquist plot at lower frequency? Why loop at lower frequency is opened?

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Mohammad Maldar

I guess the plot should be a circle at resonance frequency, do you ask why it is not ?

if yes, how did you get this plot?

Aamir Hassan Shah

No,This is not what I am asking

Lidong Dai

In the low frequency, there are some disturbances from the environments in the low frequency from the Bode diagram of impedance spectroscopy.

It is normal. I often obtained some similar impedance spectra results

I dot not find that there is any problem for your result. It is perfect result.

With Best Regards

Lidong