Matlab Code for Composite Low Pass Filter

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G F
G F 2014-11-15
评论： ashish nehra 2014-11-19
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?

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回答（1 个）

Pratik Patil
Pratik Patil 2014-11-19
Well you can start by first calculating S12 as a function of frequency. Pozar has a good explanation for doing that.
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ashish nehra
ashish nehra 2014-11-19
Thank you Pratik.
yes.
I have converted the ABCD parameters to extract s12..
but then the plotting is the main issue.

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