A Single-Layer Reflectarray Unit Cell with Enhanced Performance Using Dual Concentric Split-Circle Rings.

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Bibliographic Details
Title:	A Single-Layer Reflectarray Unit Cell with Enhanced Performance Using Dual Concentric Split-Circle Rings.
Authors:	Yahya, Likaa S.¹ likaasalim@ntu.edu.iq, Sayidmarie, Khalil H.² kh.sayidmarie@uoninevah.edu.iq
Source:	Applied Computational Electromagnetics Society Journal. Feb2026, Vol. 41 Issue 2, p144-154. 11p.
Subjects:	Reflectarray antennas, Resonators, Computational electromagnetics, Eigenfrequencies, Frequency response, Antenna design
Abstract:	This paper proposes a dual-ring unit cell design for a single-layer reflectarray antenna. The element is attained using two concentric split-ring resonators, where each ring is divided into four equal sections. By adjusting the width, scaling, and radius of the concentric split-rings, two distinct resonance frequencies are realized in each ring, attributable to the electric length inside the rings. This approach yields a wider phase range for the reflection coefficient, with a nearly linear phase response. Three different configurations are investigated to identify the best performance parameters. The electromagnetic behavior of the proposed unit element is simulated using CST Microwave Studio Suite. The reflection characteristics are analyzed using the infinite-array model with Floquet port excitation. Hexahedral meshing is employed for the antenna configuration, with the mesh density adjusted according to the wavelength to validate sufficient resolution of the structural features. The unit cell was also investigated using the HFSS frequency-domain solver based on the finite integration technique. An equivalent circuit was found using the Advanced Design System (ADS). The simulation results indicate that all three configurations offer a broad phase variation, with the minimum phase of approximately 885° at 10 GHz in case 2, and a maximum phase slope of 68°/mm at 12 GHz in case 1, over the 8-12 GHz frequency range. The configuration in case 3 achieves the widest operational bandwidth of 26.8% centered at 10 GHz. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This paper proposes a dual-ring unit cell design for a single-layer reflectarray antenna. The element is attained using two concentric split-ring resonators, where each ring is divided into four equal sections. By adjusting the width, scaling, and radius of the concentric split-rings, two distinct resonance frequencies are realized in each ring, attributable to the electric length inside the rings. This approach yields a wider phase range for the reflection coefficient, with a nearly linear phase response. Three different configurations are investigated to identify the best performance parameters. The electromagnetic behavior of the proposed unit element is simulated using CST Microwave Studio Suite. The reflection characteristics are analyzed using the infinite-array model with Floquet port excitation. Hexahedral meshing is employed for the antenna configuration, with the mesh density adjusted according to the wavelength to validate sufficient resolution of the structural features. The unit cell was also investigated using the HFSS frequency-domain solver based on the finite integration technique. An equivalent circuit was found using the Advanced Design System (ADS). The simulation results indicate that all three configurations offer a broad phase variation, with the minimum phase of approximately 885° at 10 GHz in case 2, and a maximum phase slope of 68°/mm at 12 GHz in case 1, over the 8-12 GHz frequency range. The configuration in case 3 achieves the widest operational bandwidth of 26.8% centered at 10 GHz. [ABSTRACT FROM AUTHOR]
ISSN:	10544887
DOI:	10.13052/2026.ACES.J.410205