The physics of angular momentum radio

Wireless communications, radio astronomy and other radio science applications of today are pre-dominantly implemented with techniques built on top of the electromagnetic linear momentum (Poynting vector) physical layer. As a supplement and/or alternative to this conventional approach, techniques rooted in the electromagnetic angular momentum (moment of momentum) physical layer have been advocated, and promising results from proof-of-concept laboratory as well as real-world radio communication experiments using angular momentum were recently reported.