trying to make arduino combine with RFID card.

I tried to achieve the object’s Space position with UHF RFID.but I don’t know which arduino products is fitness and is anybody can give some advice about it ?my English is poor hope your can endure my English.Thanks

I don't know of any RFID system suitable for finding the position of an RFID tag. Can you point to any example of such a system?

johnwasser:
I don’t know of any RFID system suitable for finding the position of an RFID tag. Can you point to any example of such a system?

I tried to use triangulation.and maybe I will try to do program design by myself.Infact ,I want to paste the RFID tag to key or mobile phone etc…because I hope I can find my key thing in time quickly.maybe it’s good for another’s too.