Induced higher order multipolar resonances from interacting scatterers

Perdana, Nanda; Rockstuhl, Carsten; Iskandar, Alexander A.

doi:10.1364/josab.410860

Cited by 4 publications

(2 citation statements)

References 46 publications

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“…To demonstrate the effect, the multipole expansion of the radiation pattern will be performed next. There are a few possible approaches for analyzing electromagnetic scattering and radiation problems in various systems, e.g., [44][45][46][47][48][49][50][51][52][53][54][55] . Fig.…”

Section: Numerical Analysis and Experimental Verificationmentioning

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: Numerical Analysis and Experimental Verificationmentioning

confidence: 99%

Genetically Synthesized Supergain Broadband Wire-Bundle Antenna

Vovchuk,

Uziel,

Machnev

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…There are a few possible multipole expansions for analyzing electromagnetic scattering and radiation problems [33][34][35][36] . They have been applied to various systems and obviously provide identical scattering patterns.…”

Section: Multipole Expansionmentioning

confidence: 99%

All-angle All Polarization Broadband ‘Corona’ Scatterer

Mikhailovskaya

Vovchuk²,

Grotov³

et al. 2022

Preprint

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Creeping waves traveling around a volumetric electromagnetic scatterer provide a significant contribution to its radar cross-section. While quite a few efforts were devoted to suppressing creeping waves as a part of radar countermeasures, here we utilize specially engineered creeping waves to our advantage to create broadband, all-angle, and polarization scatterers. Metalized spherical surfaces, patterned with corona virus-like spikes are designed to provide a broadband constructive interference between the specular reflection and creeping waves, elevating the scattering cross-section. The demonstrated miniature corona scatterers, utilizing both cascaded resonant phenomena and traveling wave interference to tailor electromagnetic interactions, outperform a resonant dipole in terms of amplitude and bandwidth quite significantly. Our experimental samples are fabricated with an additive manufacturing technique, where a 3D-printed plastic skeleton is subsequently metalized. Micron-thick layers are deposited with an electroless method and allow governing electromagnetic interactions as if the entire object was made of solid metal. Lightweight, all-angle, all-polarization, and broadband compact scatterers such as these have numerous applications, including radar deception, electromagnetic beckoning, and many others.

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Coronavirus-like all-angle all-polarization broadband scatterer

Mikhailovskaya,

Vovchuk,

Grotov

et al. 2023

Commun Eng

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Creeping waves traveling around a volumetric electromagnetic scatterer provide a significant contribution to its radar cross-section. While quite a few efforts were devoted to suppressing creeping waves as a part of radar countermeasures, here we utilize specially engineered creeping waves to our advantage to create broadband, all-angle, and polarization scatterers. Metalized spherical surfaces, patterned with corona virus-like spikes are designed to provide a broadband constructive interference between the specular reflection and creeping waves, elevating the scattering cross-section. The demonstrated miniature corona scatterers utilize both resonant cascading phenomena and traveling wave interference to tailor electromagnetic interactions, outperforming a resonant dipole in terms of amplitude and bandwidth quite significantly. Our experimental samples are fabricated with an additive manufacturing technique, where a 3D-printed plastic skeleton is subsequently metalized. Micron-thick layers allow governing electromagnetic interactions as if the entire object was made of solid metal. Lightweight, all-angle, all-polarization, and broadband compact scatterers such as these, reported here, have numerous applications, including radar deception, electromagnetic beckoning, and many others.

show abstract

Induced higher order multipolar resonances from interacting scatterers

Cited by 4 publications

References 46 publications

Genetically Synthesized Supergain Broadband Wire-Bundle Antenna

Genetically Synthesized Supergain Broadband Wire-Bundle Antenna

All-angle All Polarization Broadband ‘Corona’ Scatterer

Coronavirus-like all-angle all-polarization broadband scatterer

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