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.
Highlights
An antenna is a key element for many vital wireless technologies, including communications and power transfer [1]
While wireless communications are rather established, the wireless power transfer (WPT), proposed at the beginning of the 20th century by Tesla is experiencing a rebirth. It was caused by an experimental demonstration by Kurs et al [15] that the WPT efficiency can be drastically enhanced when the power is transferred via resonant coupling
We present our recent achievements in coherently enhanced wireless power transfer and superdirective antennas [24,25,26]
Summary
An antenna is a key element for many vital wireless technologies, including communications and power transfer [1]. Inhomogeneous near field of the dipole source excites high-order multipoles in the resonator which radiate coherently and can form the superdirectivity regime This approach is discussed in the Section 3. The coherently enhanced antenna 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, whereas the superdirective antenna possesses an increased directivity due to coherent radiation of higher-order multipoles. The both antennas are experimentally realized [24,25]
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