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. 2021 May 5;21(9):3202. doi: 10.3390/s21093202

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Matching efficiency (η_Γ) of a planar array composed of 64 elements (8 × 8) as a function of the main beam steering inside the circular angular sector (−60° $\leq$ θ₀ $\leq$ 60°, 0° $\leq$ ϕ₀ $\leq$ 180°). Equilateral triangular lattice at (a) 24.25 GHz, (b) 26.875 GHz, and (c) 29.5 GHz; square lattice at (d) 24.25 GHz, (e) 26.875 GHz, and (f) 29.5 GHz.

Matching efficiency (η_Γ) of a planar array composed of 64 elements (8 × 8) as a function of the main beam steering inside the circular angular sector (−60° $\leq$ θ₀ $\leq$ 60°, 0° $\leq$ ϕ₀ $\leq$ 180°). Equilateral triangular lattice at (a) 24.25 GHz, (b) 26.875 GHz, and (c) 29.5 GHz; square lattice at (d) 24.25 GHz, (e) 26.875 GHz, and (f) 29.5 GHz.