information about filters

hi guys i'm dealing with a new type of bandpass filter design for my final year project. i need some good online references which describes different types of filter designs, advantages and disadvantages of the design, charactersitics of different filters and other relevant info about filters. This would really help in my thesis.Pls recommend some.Thanks alot

I recommend one

Design of Microwave Filters BY Ralph Levy, Richard V.Snyder and George Matthaei