Matlab Code for Composite Low Pass Filter

Hello Guys, I have to design a low pass composite filter. Here is what I have done.

Given: Impedance (Ro) = 75ohms Cutoff frequency (fc) = 2MHz There is an infinite attenuation pole at 2.05 MHz i.e (finf). S12 dB = 20*log10 (m)

To Plot: The frequency response from 0 to 4 MHz.

Solution: I have attached the calculations below which are supposed to be done for this filter.

I need to plot the frequency response for the solution I have attached. I have also attached the required plot. I am not sure about the code to be written in matlab to get that plot. Can someone please help with the code to get that plot?

Answer 1

[Pratik Patil]

Well you can start by first calculating S12 as a function of frequency. Pozar has a good explanation for doing that.

[ashish nehra]

Thank you Pratik.

yes.

I have converted the ABCD parameters to extract s12..

but then the plotting is the main issue.