Hi,
Please suggest a RF ID reader compatible with Arduino MEGA 2560 R3 which can read 13.56 MHZ Keyfob from a distance of minimum of 6 inches or more. I do not mind using external antenna
Reading distances above 10cm are definitely outside the hobby market. You might find professional solutions that output a serial signal that you might be able to process on your MEGA2560 but expect to invest 3-4 digit numbers.
That is pushing it with an integrated transmitter and receiver in a single chip. I used to design RFID readers for a living at one time. We found that you always got better results with making the TX and RX out I’d discreet components.
You can extend the antenna but the problem will be tuning it. Remember a 13.56 MHz tag receives at that frequency but transmits back to the reader at a quarter of that frequency, so any single coil antenna has to be tuned at both frequencies. You might be better off using two antennas.
Do you want to use that frequency? You can get key fobs that work on 125 KHz, and I used to make readers for those with an 18” range.
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