Full-duplex nonreciprocal beam steering metasurfaces comprising time-modulated twin meta-atoms
Full-duplex nonreciprocal beam steering metasurfaces comprising time-modulated twin meta-atoms
We present the concept, theoretical model and experimental implementation of a full-duplex nonreciprocal-beam-steering transmissive phase-gradient metasurface. Such a metasurface is realized by exploiting the unique properties of the frequency-phase transition in coupled time-modulated twin meta-atoms. The metasurface may be placed on top of a source antenna to transform the radiation pattern of the source antenna, and introduce different radiation patterns for the transmit and receive states. In contrast to the recently proposed applications of time modulation, here the incident and transmitted waves share the same frequency. The metasurface is endowed with directive, diverse and asymmetric transmission and reception radiation beams, and tunable beam shapes. Furthermore, these beams can be steered by simply changing the modulation phase. The proposed coupled meta-atoms inherently suppress undesired time harmonics, leading to a high conversion efficiency which is of paramount importance for practical applications such as point to point full-duplex communications.
physics.app-ph, physics.optics
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
Eleftheriades, George V.
280bbae6-32df-4af5-bcad-110f38ad72e7
11 November 2019
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
Eleftheriades, George V.
280bbae6-32df-4af5-bcad-110f38ad72e7
[Unknown type: UNSPECIFIED]
Abstract
We present the concept, theoretical model and experimental implementation of a full-duplex nonreciprocal-beam-steering transmissive phase-gradient metasurface. Such a metasurface is realized by exploiting the unique properties of the frequency-phase transition in coupled time-modulated twin meta-atoms. The metasurface may be placed on top of a source antenna to transform the radiation pattern of the source antenna, and introduce different radiation patterns for the transmit and receive states. In contrast to the recently proposed applications of time modulation, here the incident and transmitted waves share the same frequency. The metasurface is endowed with directive, diverse and asymmetric transmission and reception radiation beams, and tunable beam shapes. Furthermore, these beams can be steered by simply changing the modulation phase. The proposed coupled meta-atoms inherently suppress undesired time harmonics, leading to a high conversion efficiency which is of paramount importance for practical applications such as point to point full-duplex communications.
Text
1911.04033v1
- Author's Original
More information
Published date: 11 November 2019
Additional Information:
This paper changed title before publication. It was published as Taravati, S., & Eleftheriades, G. V. (2020). Full-Duplex nonreciprocal beam steering by time-modulated phase-gradient metasurfaces. Physical Review Applied, 14(1), [014027]. https://doi.org/10.1103/PhysRevApplied.14.014027
Keywords:
physics.app-ph, physics.optics
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Local EPrints ID: 482992
URI: http://eprints.soton.ac.uk/id/eprint/482992
PURE UUID: 81c6caa9-99da-4da3-a2d8-4569e166c02c
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Date deposited: 18 Oct 2023 16:42
Last modified: 02 May 2024 02:05
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Author:
Sajjad Taravati
Author:
George V. Eleftheriades
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