Design Guidelines and Performance Analysis of a Wideband Coaxial Horn Antenna Fabricated via Additive Manufacturing

IF 3.5 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Open Journal of Antennas and Propagation Pub Date : 2024-03-27 DOI:10.1109/OJAP.2024.3405849
Elígia Simionato;Ivan Aldaya;José A. de Oliveira;Andre L. Jardini;Julian Avila;Guilherme S. da Rosa;Rafael A. Penchel
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Abstract

This work introduces a Ka-band coaxial horn antenna that incorporates a specialized dielectric supporting structure and a transition to a 2.4 mm connector. The inner and outer radii of the coaxial aperture were sized using an approximated model for an open-ended coaxial waveguide. The theory of small reflections was then used to account for the reflection coefficient resulting from an additional cascading cylindrical-conical section. A refined numerical model, representing more accurately a prototype, featured a transition region to standardized connectors and a dielectric structure that offers mechanical support for the inner conductor and impedance matching. Ansys HFSS full-wave electromagnetic finite-element method solver was used to compute the parameters of the antenna, and a genetic algorithm optimizer was employed to improve the performance of the complete coaxial horn. A prototype was fabricated using metal additive manufacturing for the inner and outer horn conductors, while the dielectric support was created using 3D polymer printing. Experimental measurements demonstrate that the prototyped antenna has an impedance bandwidth of above 79.36% (19–44 GHz), a peak realized gain of 11.53 dBi, and a maximum efficiency of 89.83%. Additionally, a sensitivity analysis was conducted to evaluate the potential impact of additive manufacturing imperfections and assembly errors on the antenna’s performance.
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通过快速成型技术制造的宽带同轴喇叭天线的设计指南和性能分析
这项研究介绍了一种 Ka 波段同轴喇叭天线,它采用了一种特殊的介质支撑结构,并过渡到 2.4 毫米连接器。同轴孔径的内外半径是利用开口同轴波导的近似模型确定的。然后使用小反射理论来计算额外的级联圆柱锥形部分产生的反射系数。改进后的数值模型更准确地代表了原型,其特点是过渡区域采用了标准化连接器和介质结构,为内部导体和阻抗匹配提供了机械支持。Ansys HFSS 全波电磁有限元法求解器用于计算天线参数,遗传算法优化器用于提高整个同轴喇叭的性能。利用金属增材制造技术制作了喇叭内外导体的原型,并利用三维聚合物打印技术制作了电介质支架。实验测量表明,原型天线的阻抗带宽超过 79.36%(19-44 GHz),峰值实现增益为 11.53 dBi,最大效率为 89.83%。此外,还进行了敏感性分析,以评估增材制造缺陷和装配误差对天线性能的潜在影响。
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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
期刊最新文献
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