I am modifing a RFID antenna.
The sample board work well, however, we did a same board by ourself but the result is bad.
The sample board work range is about 10cm.
My board is about 1 cm.
The big different is our circuit do not use the large capacitor as sample board.
I am thinking that the capacitor is for huge current using when RFID send out power to read tag.
So, the problem should be the capacitor. ( I am trynig to change it to test )
However, beside this capacitor, I heard there is no Banul filter there, and no consider to the 3/4 lamda issue.
Could you please advice what are them ? and how should I get it work better ?
P.S I have only baseband (ADC) EE knowledge background.
Best regards, Boki.