Abstract:This talk proposes a novel definition of near or reactive fields by reference to the electromagnetic Lagrangian and reviews basic concepts including energy velocity, energy flow, and impedance from a reactive perspective. Schelkunoff's 1-D transmission line concept serves as a simple conceptual framework within which to understand the behavior and motion of energy in the context of opens, shorts, and other basic examples.
Application of these concepts to the dipole fields reveal fundamental properties of small antennas including quality factor and gain limits.
Finally, these ideas have practical applications in understanding the different behavior of electric and magnetic antennas, in employing near-field wireless links, and elsewhere in physics.
Bio: Hans G. Schantz is co-founder and CTO of The Q-Track Corporation, makers of Near-Field Electromagnetic Ranging (NFER) indoor location systems.
He received his Ph.D. in theoretical physics from the University of Texas at Austin, and holds degrees in physics and industrial engineering from Purdue University.
A prolific inventor with more than 40 U.S. patents to his credit, Dr. Schantz is the author of The Art and Science of Ultrawideband Antennas (2nd ed. Artech House, 2015) and the science fiction thriller, The Hidden Truth (Kindle Direct, 2016).
Hans Schantz's talk - recorded from video camera - 1 hour 43 minutes.
Last modified 13/01/2020 by IGC