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Coupled Resonator-Based Metasurface Reflector with Enhanced Magnitude and Phase Coverage
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  • Mohamed K. Emara ,
  • Debidas Kundu ,
  • Keigan MacDonell ,
  • Leandro M. Rufail ,
  • Shulabh Gupta
Mohamed K. Emara
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Debidas Kundu
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Keigan MacDonell
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Leandro M. Rufail
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Shulabh Gupta
Carleton University

Corresponding Author:[email protected]

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A metasurface reflector unit cell is proposed for achieving near-complete-range of complex reflectance (i.e., magnitude and phase) for versatile beamforming capabilities. The unit cell is based on coplanar coupled resonators: a split ring resonator (SRR) with a lumped capacitor and a lumped resistor, and a dipole ring resonator (DRR) with another lumped capacitor. The DRR inserted inside the SRR creates a coupled resonance configuration which results in an enhanced complex reflectance range at the desired frequency. To provide a physical insight and explain the operation principle of the structure, the response of the unit cell is modeled as a coupled Lorentz oscillator via the effective surface susceptibilities, where a unique plasma, damping constant, and resonant frequency can be attributed to each resonator. The proposed unit cell is demonstrated in an array configuration for linear-polarized beamforming, where full-wave simulations are used to demonstrate beam-steering, gain control, side-lobe level control and dual- and triple-beam generation, as illustrative examples. Finally experimental demonstration is performed to validate the full-wave results and obtain in-depth electrical characterization of the reflectors.