Im filtering an EMG signal, more precisely the 50 Hz frequency and its harmonics. For that, I've constructed a comb notch filter (on filterdesigner in Matlab), with its fundamental frequency being 50 Hz, sampling frequency of 10kHz, and notches's bandwidth of 0.1 Hz. That means i have a filter order of 199.
Given the filter specifications, its magnitude response is bellow. I don't understand why the first two notches almost aren't attenuated. I've read that high quality factors (Associated with low bandwidth) are related with low attenuation rate, but i don't know in what extense it explains the low attenuation of the first two harmonics. Can you explain?