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How we can increase the range of RFID system?

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pmonon

pmonon

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How we can increase the range of RFID system? Say, if we want to use passive tags, should we just use a high power Tx or go to higher freq.? Please can anyone give me some idea?
 

Free space propagation obey an inverse square law with distance, so the received power falls by 6dB when the distance is doubled.
The path loss increases with square of the transmission frequency, so losses also increases by 6dB if the frequency is doubled.
So, higher power and lower frequency would help to increase the range.
 

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