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Coherently Driven and Superdirective Antennas

Advanced Science Research Center, City University of New York, New York, NY 10031, USA
Electronics 2019, 8(8), 845; https://doi.org/10.3390/electronics8080845
Received: 16 June 2019 / Revised: 19 July 2019 / Accepted: 23 July 2019 / Published: 29 July 2019
(This article belongs to the Special Issue Intelligent Antennas)
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Abstract

Antennas are crucial elements for wireless technologies, communications and power transfer across the entire spectrum of electromagnetic waves, including radio, microwaves, THz and optics. In this paper, we review our recent achievements in two promising areas: coherently enhanced wireless power transfer (WPT) and superdirective dielectric antennas. We show that the concept of coherently enhanced WPT allows improvement of the antenna receiving efficiency by coherent excitation of the outcoupling waveguide with a backward propagating guided mode with a specific amplitude and phase. Antennas with the superdirectivity effect can increase the WPT system’s performance in another way, through tailoring of radiation diagram via engineering antenna multipoles excitation and interference of their radiation. We demonstrate a way to achieve the superdirectivity effect via higher-order multipoles excitation in a subwavelength high-index spherical dielectric resonator supporting electric and magnetic Mie multipoles. Thus, both types of antenna discussed here possess a coherent nature and can be used in modern intelligent antenna systems. View Full-Text
Keywords: antennas; coherently driven antennas; superdirective antennas antennas; coherently driven antennas; superdirective antennas
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Krasnok, A. Coherently Driven and Superdirective Antennas. Electronics 2019, 8, 845.

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