Hi Ahmed,
I understand that you would like to design a 3rd order Butterworth bandpass filter with the desired specifications and then use it to filter a signal.
For the first part of task, there are several existing helpful resources available listed below which explains how to design a bandpass filter:
Once the filter is designed, MATLAB’s inbuilt “filter” function can be leveraged to apply the filter to the signal. Further details regarding “filter” function are available in MATLAB documentation:
I hope the above resources will help achieve the task.
