Hi guys, I am venturing into the realm o RF, more specifically I am doing my thesis on emulating an RFID card with 13.56MHz carrier frequency. I wold appreciate if you could point me to some books etc. concerning antenna design (probably closed loop) and RF power transfer. Also, I had this idea. Usually the RFID antenna circuit is a parallel LC resonator. But since the reader and card coils are in a configuration similar to a transformer, why does the receiver need to be in resonance, and can´t simply use just the inductor? Is it because without the capacitor there wouldn´t be enough voltage amplitude to power anything?