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<p>This paper presents a novel approach to design a circularly polarized transmitarray antenna using a non-resonant frequency selective surface (FSS) unitcell (sub-wavelength in size). The antenna design aims to convert a linearly polarized (LP) wave into a circularly polarized (CP). The proposed unitcell utilizes a single substrate with a patch and metal grid on each side, simplifying the fabrication process. The key advantage of the proposed design is its wideband polarization conversion capability. An equivalent circuit of the transmitarray antenna is presented from which, the initial dimension of the unitcell for starting the optimization process through the full-wave simulation is given. The transmitarray antenna consists of 16*16 elements operating over X band frequency. The proposed unitcell 360° phase shift is achieved through rotation of the lower layer elements. The array achieves a gain of around 24&#xa0;dBi, a 3&#xa0;dB gain bandwidth of 27%, and a high axial ratio bandwidth exceeding 30%. To validate the design, the antenna is fabricated, and the experimental results show good agreement with the simulation results. This confirms the reliability and accuracy of the proposed approach.</p>

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Single Layer Circularly Polarized Transmitarray Antenna Using Non-resonant Frequency Selective Surface

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Hesam Rezayati Charan,
  • Hamid Reza Hassani

摘要

This paper presents a novel approach to design a circularly polarized transmitarray antenna using a non-resonant frequency selective surface (FSS) unitcell (sub-wavelength in size). The antenna design aims to convert a linearly polarized (LP) wave into a circularly polarized (CP). The proposed unitcell utilizes a single substrate with a patch and metal grid on each side, simplifying the fabrication process. The key advantage of the proposed design is its wideband polarization conversion capability. An equivalent circuit of the transmitarray antenna is presented from which, the initial dimension of the unitcell for starting the optimization process through the full-wave simulation is given. The transmitarray antenna consists of 16*16 elements operating over X band frequency. The proposed unitcell 360° phase shift is achieved through rotation of the lower layer elements. The array achieves a gain of around 24 dBi, a 3 dB gain bandwidth of 27%, and a high axial ratio bandwidth exceeding 30%. To validate the design, the antenna is fabricated, and the experimental results show good agreement with the simulation results. This confirms the reliability and accuracy of the proposed approach.