Coupled filters

Hi,
Where can I find something about filter design. If some have some books or other kinds of litterature. I allready have Pozar's "Microwave Engineering", but I would like some intuitive or practical hints.

Thank you :)

The best info is from the website of Microwave CAD, such as AWR Microwave office:

http://www.mwoffice.com/

There is a paper by Peter Martin about coupled filter design using AWR MWO. You can get the paper from the above website.

Yes I found it.

Thank you
Thomas