Time-Varying Components for Enhancing Wireless Transfer of Power and Information

Prasad Jayathurathnage, Fu Liu*, Mohammad S. Mirmoosa, Xuchen Wang, Romain Fleury, Sergei A. Tretyakov

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Temporal modulation of components of electromagnetic systems provides an exceptional opportunity to engineer the response of those systems in a desired fashion, both in the time and frequency domains. For engineering time-modulated systems, one needs to thoroughly study the basic concepts and understand the salient characteristics of temporal modulation. In this paper, we carefully study physical models of basic bulk circuit elements - capacitors, inductors, and resistors - as frequency dispersive and time-varying components and study their effects in the case of periodical time modulations. We develop a solid theory for understanding these elements, and apply it to two important applications: wireless power transfer and antennas. For the first application, we show that, by periodically modulating the mutual inductance between the transmitter and receiver, the fundamental limits of classical wireless power transfer systems can be overcome. Regarding the second application, we consider a time-varying source for electrically small dipole antennas and show how time modulation can enhance the antenna performance. The developed theory of electromagnetic systems engineered by temporal modulation is applicable from radio frequencies to optical wavelengths.

Original languageEnglish
Article number014017
Number of pages15
JournalPhysical Review Applied
Volume16
Issue number1
DOIs
Publication statusPublished - 7 Jul 2021
MoE publication typeA1 Journal article-refereed

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