I am trying to design a custom antenna for an RFID circuit I am building.
I want to make a ~20 cm circular antenna to read a tag that passes through. I still can't have success.
Reading this http://ww1.microchip.com/downloads/en/AppNotes/00710c.pdf and other sources I keep reading about the "resonant capacitor" that is required to use for the antenna to work.
I am almost sure this is what is missing in my case.
I wonder, how does this resonance capacitor work? what does it do?
Please consider I am still fairly new to electronics in case this is a very basic question.