title: Twisted radio waves and twisted thermodynamics.
abstract: We present and analyze a gedanken experiment and show that the assumption that an antenna operating at a single frequency can transmit more than two independent information channels to the far field violates the Second Law of Thermodynamics. Transmission of a large number of channels, each associated with an angular momenta 'twisted wave' mode, to the far field in free space is therefore not possible.
authors: Solid State Electronics, Photonics, and Nanoengineering Division, Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas, United States of America. Laszlokish@tamu.edu
authors: Laszlo B
authors: LB
authors: Kish
authors: Robert D
authors: RD
authors: Nevels
mesh_terms: D011846:Radio Waves; D013816:Thermodynamics; D059015:Wireless Technology