Inverse Design of a Wide-Angle Wideband Programmable THz Reflectarray Through Generative Adversarial Networks

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Yousefi Pezhman; Khajeh Ali; Yahaghi Alireza; Hosseini Keyhan

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Journal Paper

Paper Information

Journal: International Journal of Information and Communication Technology Research Year:2025 | Volume:17 | Issue:3 Page(s): 1-8

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Information Journal Paper

Title

Inverse Design of a Wide-Angle Wideband Programmable THz Reflectarray Through Generative Adversarial Networks

Author(s)

Yousefi Pezhman | Khajeh Ali | Yahaghi Alireza | Hosseini Keyhan | Issue Writer Certificate

Keywords

Reflectarray

Unitcell

Subcell

Deflection

Generative Adversarial Network

Abstract

A Reflectarray optimized through a Generative Adversarial Network (GAN) is demonstrated. This design focuses on the impact of the top layer on the reflection phase and utilizes the correlation between phase distribution and the direction of the reflected beam. Six programmable Subcells are optimized to accommodate two incident angle waves simultaneously. Silicon substrate is exploited making the design compatible with integrated circuits. The far-field analysis indicates that for incident angles of 19.471° and 41.81°, as well as their vicinity, the Reflectarray effectively redirects the incoming waves to reflect towards near-normal direction to its surface. This suggests a near independence of the Deflection angle from the incident angle within a specific angular range, making the proposed Reflectarray a planar THz beam collimator. The proposed Subcells achieve a reflection phase range of 342°. The return losses for the incident angles of 19.471° and 41.81° are 1.9 dB and 1.4 dB, respectively. For a finite Reflectarray measuring 15λ×5λ, the pattern gain and fractional bandwidth are reported as 19.44 dB and 24.8% for the incident angle of 19.471°, and 19.17 dB and 29.9% for the incident angle of 41.81°. This denotes an excellent wideband behavior for the proposed single-layer pixelated Reflectarray.

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