Wideband and High-Efficiency Circularly Polarized Unit-Cell for X and Ka-Band Transmitarrays

IF 3.5 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Alessandro de Oliveira Cabral Junior;Hamza Kaouach;André Barka
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Abstract

This paper presents a novel approach for linear to circular polarization (LP-CP) conversion in transmitarray antennas. The proposed conversion mechanism differs significantly from previous published realizations. The concept utilizes a transmission line modeling-based excitation technique, in which a centralized via excitation is split into two striplines carefully designed to balance excitations and guarantee a phase quadrature. The striplines are embedded at the center of the patch antenna allowing a compact footprint and a simple design structure. The applied true-time delay (TTD) technique assures the radiation of a wideband and low axial ratio circularly polarized (CP) field. To optimize bandwidth and transmission efficiency, a stacked patch configuration is also employed, allowing for simultaneous high polarization conversion and transmission efficiency. The unit-cell design methodology is detailed, and two transmitarray designs are realized in both X and Ka bands. Experimental results from a fabricated X-band $20 \times 20$ cell array prototype demonstrate a peak aperture efficiency of 30%, accompanied by a simultaneous 16% -1 dB gain and 1 dB axial ratio bandwidths. Furthermore, the measured wideband and highly efficient Ka-band transmitarray with a $70 \times 70$ cell array confirmed a remarkable gain of 39.8 dB and 55% aperture efficiency at 29 GHz, surpassing previous LP-CP transmitarray antennas, while maintaining axial ratio values below 1 dB in a bandwidth larger than 26%.
用于 X 波段和 Ka 波段发射阵列的宽带高效圆极化单元电池
本文提出了一种在发射天线阵中实现线性极化到圆极化(LP-CP)转换的新方法。所提出的转换机制与以往发表的实现方法有很大不同。这一概念利用了基于传输线建模的激励技术,其中,集中的通激被分成精心设计的两条带状线,以平衡激励并保证相位正交。条纹嵌入贴片天线的中心,从而实现了紧凑的占地面积和简单的设计结构。应用的真实时间延迟(TTD)技术确保了宽带和低轴向比圆极化(CP)场的辐射。为了优化带宽和传输效率,还采用了堆叠式贴片配置,可同时实现高极化转换和传输效率。详细介绍了单元单元设计方法,并在 X 和 Ka 波段实现了两种发射阵列设计。从制造的 X 波段 $20 \times 20$ 单元阵列原型获得的实验结果表明,其峰值孔径效率为 30%,同时具有 16% -1 dB 增益和 1 dB 轴向比带宽。此外,使用 70 美元乘以 70 美元的单元阵列测量的宽带高效 Ka 波段发射阵列证实,在 29 GHz 频率下具有 39.8 dB 的显著增益和 55% 的孔径效率,超过了以前的 LP-CP 发射阵列天线,同时在大于 26% 的带宽内保持低于 1 dB 的轴向比值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.50
自引率
12.50%
发文量
90
审稿时长
8 weeks
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