Thanks for your reply
The idea of my application is to design a table with multiple RFIDs reader which allows us to teach the child languages
for example I will ask the child to spell word "House" he will pick up the cubes with letters(H-O-U-S-E) and put them on the table beside each other in that way I need to control the readers
I have read some papers that suggest the following solution
"in order to control multiple RFIDs, you have to make one reader active while the rest will be passive and next time other reader will be active while the rest will be passive and so on to avoid the interference"
the problem that I need to read multiple cubes and they will put close to each other as I explained before
What do think about that? if you have any suggestion please contact me :)