I am very new to this. I'm a dentist trying to improve client flow in a busy office.
I would like to develop a cheap proof of concept for an NFC enabled client tracking system using a hacked mobile phone. My idea is to develop a system where I place passive NFC tags on the door frames of my office. As a client walks into the room, the cell phone reads the NFC tag and sends a message via Wi-Fi to a computer which collects the data.
Since NFC only works at short distances, I would like to make an external antenna that would extend the range of the cell phone (Samsung Galaxy 4) and allow it to read tags at a distance of about 30-60 cm. The size/shape of the antenna is not a concern at this point, but practically speaking the largest dipole antenna I would consider is 200 cm. (I'm not completely sure what a dipole antenna is but I read this and it sounded important :)
I know RFID is better at these distances but it's also more expensive and I'd like to keep the cost to the absolute minimum. The same goes for the mobile device. This may be possible with more specialized equipment but the cost and ubiquity of mobile phones make it the preferred reader (also makes programming the tags easier).
My questions are:
- Is this feasible?
- How would the antennas be designed? Shape - planar circular vs cylindrical vs dipole; Size - 22.11 meters long
- What is the best way to connect to the native NFC antenna pins?