volume | PIER Journals

Abstract

In this paper, a novel single-layer anisotropic unit with both reflection and transmission functions is proposed. The unit is a ring-encircled two mirror-symmetry fan-shaped patches, and is fabricated in one side of an F4B substrate. The unit structure is asymmetry with respect to x- and y-axes, and both transmitted and reflected cross-polarized fields are generated simultaneously when the co-polarized field is incident on the symmetry broken surface. Full 360° phase shift range is achieved by utilizing the cross-polarized field, and the transmitted and reflected coefficient magnitudes are above 0.49 close to the theoretical limit. Using this anisotropic unit, three single-layer transmit-reflect-arrays are designed: (1) Two high-gain beams in (θ₁ = 0°, φ₁ = 0°) and (θ₁ = 180°, φ₁ = 0°) directions. The gain is 20.9 dBi, and the 3 dB beam width is 8.9°. (2) Two OAM beams with l = 1 at (θ1 = 45°, φ₁ = 0°) and (θ₂ = 135°, φ₂ = 0°). (3) Four OAM beams with l = 1 at (θ₁ = 30°, φ₁ = 0°), (θ₂ = -30°, φ₂ = 180°), (θ₃ = 150°, φ₃ = 0°) and (θ₄ = -150°, φ₄ = 180°). The simulated and measured results agree well and validate the design principle. The proposed metasurface has the following advantages: single-layer, transmission and reflection dual-functions, multi-beam, and high gain.

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Prof. Hui-Fen Huang

Dr. Shuai-Nan Li