design and simulate Helical filter by Comsol 4.2

I'm vietnamese.I,m final year student.now i'm doing graduation thesis.my theme is "design and simulate Helical filter" and i want to simulate it by comsol 4.2 .I hope everyone could share experience,knowledge or anything abuot it.
Appreciate all comment !
I wish to hear. thank you

email :hunglam_vt063@yahoo.com.vn