hii, i want to make a RFID system that every time that tag go into the range it will make an alert and send a massage to the computer . i bough rfid antenna (EPC class1 gen2 869-960MHz) and i want to connect it to a arduino bord. the antenna cable is SMA male, I wondered if you can help me and tell me what adaptors do i need and if i need a reader also to get the data through arduino UNO bord.
I am not sure I fully understand your question here. You need an RFID Reader that operates at the same frequency of the antenna you intend to use. An RFID antenna only boosts the read range of the RFID reader it is attached to, it has no ability to read RFID tags on its own. Did you purchase [this antenna from SparkFun? If you did, that antenna is intended to be used with the [SparkFun Simultaneous RFID Reader.
If you want to learn more about that, I would recommend reading through the [Hookup Guide for the Simultaneous RFID Reader. That will go over the hardware, power considerations and some example code to get you started.