I need to scan 134.2kHz PIT FDX tags from a range of 5cm to 10cm. So far, I have built custom reading circuit. It has the standard R+L+C in series driven by 134.2 kHz square wave and the output is taken across the capacitor and processed. I am only able to read the tag when it is at the center of the coil. I was wondering how I can increase the range:
- What all factors does the range depend on? (Current? if yes, how do I increase current? will decreasing impedance by changing L and C work?)
- Does range/SNR depend on Lcoil and Ltag. Do I have to do some matching to increase this?
Any help regarding this will be extremely appreciated. Thank you so much for your time!