Hello everyone , I bought this from aliexpress. I made a mistake I know but It is too late. I am trying to built my dogs automatic machine. It is working but my problem is read range. I bought both antenna the round one and the rectangular one. It says we can read from 3-40 cm but when I use the round one, it reads from 5 cm. When I use the rectangular one, it reads from 1 cm. Is there any suggestion for make antenna. I need at least 30-40 cm read range.Wave length = 2235.469m but If I take 132.2 (operational frequency I guess)= 2269.288m L=4.26 mH,R=70 ohm , Q=48 , capacitor= 330pF , Current=50mA BW=2800 Hz .How can I do 30-40 cm reader range antenna?
Here it is only reading from this range.