Genetically Designed Wire Bundle Superscatterers

Grotov, Konstantin; Vovchuk, Dmytro; Kosulnikov, Sergei; Gorbenko, Ilya V.; Shaposhnikov, Leon; Ladutenko, Konstantin; Belov, Pavel A.; Ginzburg, Pavel

doi:10.1109/tap.2022.3177531

Cited by 10 publications

(3 citation statements)

References 36 publications

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“…Six passive director elements were chosen to form the geometry. This number, being found beneficial to optimize wire bundle scatterers [36][37][38][39][40], was chosen as a tradeoff between design simplicity and functionality. While this configuration fits the demands of a six-sector 4G wireless network, it can be further tuned per application, i.e.…”

Section: Optically Steerable Antennamentioning

confidence: 99%

“…The optimization is applied to maximize the directivity and gain of the antenna, constraining its overall size [42]. While directivity in a Yagi-Uda antenna relies on interference phenomena between several directors and reflectors, the proposed realization involves multipolar interaction and near-field coupling between elements [37][38][39]. The radius of the imaginary cylindrical surface (considering the cylinder radius R = 20 mm), containing optically switchable passive elements, was chosen to be 41 mm ≈ 0.26λ.…”

Section: Optically Steerable Antennamentioning

confidence: 99%

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Dual-band electro-optically steerable antenna

Vovchuk,

Mikhailovskaya,

Dobrykh

et al. 2023

J. Opt.

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The ability to obtain dynamic control over an antenna radiation pattern is one of the main functions, desired in a vast range of applications, including wireless communications, radars, and many others. Widely used approaches include mechanical scanning with antenna apertures and phase switching in arrays. Both of those realizations have severe limitations, related to scanning speeds and implementation costs. Here we demonstrate a solution, where the antenna pattern is switched with optical signals. The system encompasses an active element, surrounded by a set of cylindrically arranged passive dipolar directors, functionalized with tunable impedances. The control circuit is realized as a bipolar transistor, driven by a photodiode. Light illumination in this case serves as a trigger, capable of either closing or opening the transistor, switching the impedance between two values. Following this approach, a compact half-a-wavelength footprint antenna, capable of switching between 6 dBi directional patterns within a few milliseconds’ latency was demonstrated. The developed light activation approach allows constructing devices with multiple almost non-interacting degrees of freedom, as a branched feeding network is not required. The capability of flexible switching between multiple electromagnetic degrees of freedom opens pathways to new wireless applications, where fast beam steering and beamforming performances are required.

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Section: Optically Steerable Antennamentioning

confidence: 99%

Section: Optically Steerable Antennamentioning

confidence: 99%

Dual-band electro-optically steerable antenna

Vovchuk,

Mikhailovskaya,

Dobrykh

et al. 2023

J. Opt.

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“…However, in many cases, an infinite-size (in theory) ground plane serves as an integral part of the system, questioning the validity of applying an electrically small criterion. A promising platform, in application to superdirectivity and superscattering, is small arrays of near-field coupled resonators [19][20][21][22][23] , optimized with the aid of fast genetic algorithms.…”

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confidence: 99%

Genetically Synthesized Supergain Broadband Wire-Bundle Antenna

Vovchuk,

Uziel,

Machnev

et al. 2023

Preprint

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High-gain antennas are essential hardware devices, powering numerous daily applications, including distant point-to-point communications, safety radars, and many others. While a common approach to elevate gain is to enlarge an antenna aperture, highly resonant subwavelength structures can potentially grant high gain performances. The Chu-Harrington limit is a standard criterion to assess electrically small structures and those surpassing it are called superdirective. Supergain is obtained in a case when internal losses are mitigated, and an antenna is matched to radiation, though typically in a very narrow frequency band. Here we develop a concept of a spectrally overlapping resonant cascading, where tailored multipole hierarchy grants both high gain and sufficient operational bandwidth. Our architecture is based on a near-field coupled wire bundle. Genetic optimization, constraining both gain and bandwidth, is applied on a 24-dimensional space and predicts 8.81 dBi realized gain within a half-wavelength in a cube volume that is 13% fractional bandwidth, which is the best performance in the field. Small wire bundle structures are rather attractive for designing superscattering and superdirective structures, as they have a sufficient number of degrees of freedom to perform an optimization, and, at the same time rely on simple fabrication-tolerant layouts, based on low-loss materials.

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