Superscattering in 2D cylindrical structures

Vulfin, Vladimir; Shavit, R.

doi:10.1109/aps.2014.6905045

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…These algorithmic approaches were introduced into engineering problems in the 1960-70s 27 and since then, being supported by ever-growing computational power, started to shift aside from conventional design rules, e.g., 28,29 . In the context of this report, it is worth mentioning existing studies looking into circular rods superscatterers 30 , superabsorptive nanoparticles 31 , coreshell cylindrical superscatterers 32 , subwavelength superscattering nanospheres 33 , antenna design, nanoplasmonic particles 23,34,35 , and others [36][37][38][39][40][41][42] .…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

Genetically Synthesized Supergain Broadband Wire-Bundle Antenna

Vovchuk,

Uziel,

Machnev

et al. 2023

Preprint

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Genetically synthesized supergain broadband wire-bundle antenna

Vovchuk,

Uziel,

Machnev

et al. 2024

Commun Eng

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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. The experimental gain is 8.22 dBi with 13% fractional bandwidth. The developed approach can be applied across other frequency bands, where miniaturization of wireless devices is highly demanded.

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