dual band matching

I have to design a down converter mixer for 2.4 GHz and 5.25 GHz WLAN bands..the IF is 300 MHz...and I am using a FET for mixing...everything else understood...what is the approach to design a dual band matching network...are there any references I can look up?? I've checked a lot of books and quite a few papers...none of them has really helped..what is the approach to the problem??

thnx...

Mixers are normally broad band.
However you can get more info on multiple band mixers from the below link.
http://www.freepatentsonline.com/EP0310222.html