A standard ground plane antenna has a length of one quarter of the wavelength which is 5.53 meters. It
has a radiation resistance close to 50 ohms. In the world of 13.56 MHz RFID systems, we are unlikely to
come close to such dimensions. And even if we do, the amount of radiated power will remain quite small.
Let us consider an example. Say that we have a loop antenna and that its area is one square meter.