What are the technical differences between NFMI and RF wireless communications?
Whereas most wireless communication is accomplished by propagating an RF plane wave through free space, near-field magnetic wireless utilizes a non-propagating quasi-static magnetic field. For example, in a typical RF communication system a transmitter couples a modulated RF voltage to an antenna. The antenna in turn generates a modulated RF plane wave (in the far field) which flows through free space while alternately transferring its energy between its electric and magnetic fields. The energy transfer between the fields occurs at the carrier frequency that in many modern mobile devices is in the 900 MHz, 1.9MHz or 2.4 GHz range. A receiving antenna on the remote device receives the energy from the plane wave and converts it into a modulated voltage input to a receiver that extracts the information content. A magnetic wireless system on the other hand does not rely on the flow of energy for communication. Instead the modulated magnetic field generated by a transducer element remains r
