Metasurface Reflector with Independent Polarizations Control using a Supercell Concept

Rufail, Leandro M.; Emara, Mohamed K.; Ashoor, Ahmed Z.; Gupta, Shulabh

doi:10.1109/ap-s/usnc-ursi47032.2022.9887209

Cited by 2 publications

(1 citation statement)

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“…Another practical extension of this work is to include polarization control, following the supercell concept as proposed in [44], [45]. Future work will also focus on retrieving some of the lost magnitude-phase coverage when DC isolation gaps are introduced into the unit cell.…”

Section: Discussionmentioning

confidence: 99%

Dynamic Metasurface Reflectors Based on Coupled Resonators for Simultaneous Magnitude and Phase Control

Emara,

Kundu,

Macdonell

et al. 2023

IEEE Access

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A novel metasurface reflector unit cell based on two coupled resonators is proposed and demonstrated for real-time reconfigurable beamforming in the X-band (8-12 GHz). The unit cell is composed of a splitring resonator (SRR) with tunable capacitance and a dipole-ring resonator (DRR) with tunable resistance, whose collective variations allow for control over the complex reflectance at a desired frequency. To gain physical insight into its working mechanism, the proposed unit cell is modeled as a coupled Lorentz oscillator using the surface susceptibility description of the unit cell. Thereafter, a metasurface reflector based on the proposed unit cell is demonstrated in full-wave simulations to achieve various beamforming examples, such as beam-steering, side-lobe level control, beam-steering with amplitude control, and multibeam patterns, from a single normally-incident plane wave excitation. Three metasurface reflectors are fabricated to experimentally demonstrate the proposed concept; the first is based on an SRR with a varactor diode, the second is based on a DRR with a PIN diode, and the third is based on the proposed coupled SRR-DRR configuration with both varactor and PIN diodes, for simultaneous magnitude and phase control. The metasurface reflector based on the coupled resonator unit cell is experimentally demonstrated to achieve versatile beam transformations including beam-steering with amplitude control and multi-beam patterns.INDEX TERMS metasurface reflectors, beamforming, side-lobe level control, beam-steering, multibeam patterns, complex reflectance, reconfigurable intelligent surfaces, coupled resonators, smart radio environments.

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Section: Discussionmentioning

confidence: 99%