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A Circularly Polarized Horn Antenna Based on an FSS Polarization Converter

IEEE Antennas and Wireless Propagation Letters(2020)SCI 2区

Southeast Univ | SARFT

Cited 14|Views31
Abstract
This letter designed a circularly polarized horn antenna by loading a frequency selective surface (FSS) polarization converter at the aperture of a standard horn. The proposed polarization converter is based on multilayer nonresonant FSS. It is composed of a two-layer dielectric slab and three printed metal layers, which are etched on the top, middle, and bottom layers of the slab. The three metal layers consist of a two-layer patch with a square truncated corner and a one-layer grid line with a slot. By introducing perturbation to both the patch and the grid line, the polarization converter shows a low profile and subwavelength unit size, whose dimension is 0.18λ0 × 0.18λ0 while the thickness is only 0.1λ0. The simulated results show that the axial ratio (AR) is less than 3 dB in the frequency range of 9.6–11.7 GHz, i.e., a fractional bandwidth of 19.7% within the targeted frequency band. The measurement results are in a good agreement with the simulation results, which proves the feasibility of the design.
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Axial ratio (AR),frequency selective surface (FSS),horn,polarization converter
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要点】:本文设计了一种基于频率选择表面(FSS)极化转换器的圆极化喇叭天线,实现了低剖面和亚波长单元尺寸,具有较宽的带宽和良好的极化性能。

方法】:通过在标准喇叭天线的口径处加载多层非谐振FSS极化转换器,该转换器由两层介电板和三层印刷金属层组成,金属层分别蚀刻在板的顶层、中间层和底层。

实验】:通过仿真和实际测量,验证了设计的可行性,数据集名称未提及,但实验结果显示在9.6–11.7 GHz的频率范围内,轴比(AR)小于3 dB,即目标频带内的分数带宽为19.7%,测量结果与仿真结果一致。