hi farzad,
I have found 3 links that will help with your calculations of a filter.
Check out the calculators in the first link.
Eric
http://sim.okawa-denshi.jp/en/Fkeisan.htm
http://www.electronics-tutorials.ws/filter/filter_2.html
http://www.murata.com/en-eu/products/emiconfun/emc/2011/03/28/en-20110328-p1
I have found 3 links that will help with your calculations of a filter.
Check out the calculators in the first link.
Eric
http://sim.okawa-denshi.jp/en/Fkeisan.htm
http://www.electronics-tutorials.ws/filter/filter_2.html
http://www.murata.com/en-eu/products/emiconfun/emc/2011/03/28/en-20110328-p1