volume | PIER Journals

Abstract

The curvature effects of curved metasurface (MTS) lead to oblique incidence and different unit radiation normal vectors (DURNVs). Oblique incidence causes a reduction in scattering amplitude and degrades focusing efficiency (FE), and DURNV distorts the radiation pattern of curved MTSs. To the knowledge of the authors, for the first time, this paper proposes a phase amplitude modulation and phase modulation (PAM-PM) combined modulation technique for cylindrical MTS to generate a high signal-to-noise ratio (SNR) and high FE three-dimensional (3D) shaped near field with a spiral cross-sectional shape. In addition, a near field with controllable spatial positions is a practical application requirement, and this paper provides a method to establish a 3D-shaped near field with controlled spatial positions. The proposed cylindrical MTS with PAM-PM modulation technique outperforms the PM technique significantly, achieving an SNR above 13 dB and an FE of 38.1%. For cylindrical MTS with only PM, there exists some noise, and the FE is 33.2%. This proposed modulation technique can be applied to 3D near-field systems based on conformal MTS, including wireless power transfer, radiometric temperature sensors for hyperthermia, and medical imaging systems.

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Prof. Hui-Fen Huang

Dr. Ke-Chun Niu