Self resonance in low pass filter simulation in ADS

[nikhil_56]

Hello,

I am simulating low pass filter in ADS, i can able to achieve good attenuation in stop band but doubt my is there are some peaks while transitioning(steeper graph) from pass band to stop band, i guess these peaks are self resonance how can i reduce this peaks in ADS?

 

[FvM]

Which filter prototype are you trying to implement? Can you show intended and actual transfer function?

 

[nikhil_56]

Which filter prototype are you trying to implement? Can you show intended and actual transfer function?

It's Chebyshev low pass filter using stepped impedance method i am designing.

 

[BradtheRad]

Chebyshev filters exhibit several odd peaks and troughs. Articles speak of polynomials associated with this type. Since the math it's derived from is more complicated, I guess the resulting graph has a distinctive pattern of peaks and troughs.

 

[nikhil_56]

Chebyshev filters exhibit several odd peaks and troughs. Articles speak of polynomials associated with this type. Since the math it's derived from is more complicated, I guess the resulting graph has a distinctive pattern of peaks and troughs.

How to eliminate hormonics in low pass filter design in stop.

 

[FvM]

Still waiting for a picture of designed and observed transfer function.

There's nothing special about Chebyshev, it just means that the filter is designed with equiripple transfer function, either in passband (type I) or stopband (type II).