Rfid?

Hi guys,

I am looking to make an RFID reader, I would love to make a UHF (900 MHZ) reader but for the life of me I can not find any reader ICs for the UHF range. Atmel and TI which seem to be the biggest players only have reader ICs for the 13MHZ and the 125 khz transponders. I have been looking for weeks, if anyone can give me any leads as to where I can find UHF reader ICs I would be very grateful. Also if anyone has any good infor on RFID reader design in general I would appreciate it very much also