volume | PIER Journals

Abstract

This paper proposes a spin decoupling phase gradient (SDPG)-scalar holographic impedance (SHI) bidirectional hybrid metasurface (MTS). The integrated SDPG MTS modulates the space wave (SPW) and is excited by the horn, whereas the SHI-integrated MTS modulates the surface wave (SFW) and is excited by a surface-mounted monopole. As example, (1) Dual orbital angular momentum (OAM) beams are generated at 18.3 GHz by the integrated SDPG MTS at 18.3 GHz: left hand circular polarization (LHCP) (OAM mode l₁ = 1, θ₁ = 30˚, φ₁ = 0˚), right hand circular polarization (RHCP) (l₂ = -1, θ₂ = -30˚, φ₂ = 0˚). (2) Linear polarization (LP) pencil beam is generated at 7.8 GHz by the integrated SHI MTS: (l₃ = 0, θ₃ = 150˚, φ₃ = 0˚). The peak gain is 19.9 dBi, and the OAM purity is above 84.7%. The novelty of the manuscript is as follows: (1) To the authors' knowledge, a full-space SDPG-SHI hybrid metasurface has been developed for the first time, which greatly expands the bidirectional multifunctional design freedom. (2) Much higher aperture efficiency (AE) than published results. (3) The proposed SDPG-SHI hybrid MTS simultaneously possesses the following advantages: small size (π × 7.19λ × 7.19λ at 18.3 GHz, and π × 3.06λ × 3.06λ at 7.8 GHz), full space, multibeams, multipolarization, reconfigurability and simultaneous modulation of SPW and SFW. The developed MTS has promising applications in high-capacity bidirectional communication scenarios.

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Prof. Hui-Fen Huang

Mr. Fuhua Liu