用于背腔式天线的多材料宽带电磁吸收器的设计与制造。

Design and fabrication of multi-material broadband electromagnetic absorbers for use in cavity-backed antennas.

作者信息

Gupta Ellen, Bonner Colin, Muhammed Faheem, McParland Kyle, Mirotznik Mark

机构信息

Electrical and Computer Engineering Department, University of Delaware, Newark, DE 19716, USA.

Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA.

出版信息

Heliyon. 2023 Mar 6;9(3):e14164. doi: 10.1016/j.heliyon.2023.e14164. eCollection 2023 Mar.

DOI:10.1016/j.heliyon.2023.e14164

PMID:36967905

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10031325/

Abstract

We investigated the feasibility of designing and fabricating novel broadband radiofrequency (RF) absorbers for use in cavity-backed antennas. Fabricating the absorber involved a multi-material additive manufacturing (AM) approach that combined two polymer filaments: a low-loss dielectric filament and a lossy carbon-loaded filament. An iterative optimization algorithm was developed to deploy these filaments and create gradient distributions of material properties that minimize reflectance over a desired frequency band and a range of incident angles to achieve wideband electromagnetic absorption. The chosen material profiles were effectively realized using a spatially varying subwavelength lattice structure printed via fused filament fabrication. Experimentally, validation results demonstrated low reflectance over a wide frequency band, 10 to 40 GHz, and a range of incident angles, 0°-50°. Finally, this printed multi-material absorber was integrated within a cavity-backed spiral antenna and used to suppress backlobe radiation while maintaining an acceptable radiation pattern in the forward direction. While this study investigated cavity-backed antennas, these computational and experimental methods are potentially useful for a wide range of other applications.

摘要

我们研究了设计和制造用于背腔天线的新型宽带射频（RF）吸收器的可行性。制造该吸收器采用了一种多材料增材制造（AM）方法，该方法结合了两种聚合物长丝：一种低损耗介电长丝和一种含碳损耗长丝。开发了一种迭代优化算法来部署这些长丝，并创建材料特性的梯度分布，以在所需频带和一系列入射角范围内最小化反射率，从而实现宽带电磁吸收。通过熔丝制造法打印的空间变化亚波长晶格结构有效地实现了所选的材料分布。实验结果表明，在10至40 GHz的宽频带和0°-50°的一系列入射角范围内，反射率较低。最后，这种打印的多材料吸收器被集成到背腔螺旋天线中，用于抑制后瓣辐射，同时在前向方向保持可接受的辐射方向图。虽然本研究针对的是背腔天线，但这些计算和实验方法可能对广泛的其他应用有用。