I want to design microstrip antenna for UHF RFID. The chip I'm using is SL3S1013FTB0. I found some demo kits and found some antenna examples. One of them has small antenna that I'm especially interested in and it looks like this:
But there is no information about this design and to be honest I'm having a hard time understaing how it works. What is more, when I checked the gerbers it seems to be shorted to ground!
Can anyone explain how it works or recommend any book/article that explains it?