I am working on a RFID project. The RFID tags that i am using are UHF whose frequency range is given i.e. 860-960 MHZ. How can i find the exact frequency on which a tag is working?. Does the value of frequency change with distance?. The only thing i have is RSSI, which i can measured from my equipment at any distance from the tag within the reading capacity of the reading.
How can I select a frequency if the frequency range is given?
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Passive RFID tags do not select their frequency. It is completely determined by the reader generating a carrier signal. The 860-960 MHz range indicates it's a passive UHF tag. Depending on your physical location and regulatory requirements, the tag will respond at a single channel (frequency) within that band. Most tag readers report tag reads with optional meta data, such as the channel the tag was read on.
If the reader doesn't support this, you would need some advanced instrumentation to sniff the transaction. This can be accomplished with a filed probe, directional coupler + diode detector, or real time spectrum analyzer.
For reference, readers in the EU will operate at 865-868MHz and in NA at 902-928MHz.