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基于人工磁导体的增益增强宽带共面波导天线。

Gain enhancement wideband CPW antenna based on artificial magnetic conductor.

作者信息

AboEl-Hassan May, Farahat A E, Hussein K F A

机构信息

Microwave Engineering Department, Electronics Research Institute (ERI), Cairo, Egypt.

出版信息

Sci Rep. 2025 Feb 28;15(1):7108. doi: 10.1038/s41598-025-89622-9.

DOI:10.1038/s41598-025-89622-9
PMID:40016359
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11868653/
Abstract

Unidirectional radiation and, hence, gain enhancement can be achieved by placing a primary radiator (simple antenna) at suitable height over a reflector to diminish back radiation and to enhance the forward radiation. The reflector used to enhance the gain is usually an electrically conducting surface (ECS) or an artificial magnetic conducting surface (AMCS). The ECS unifies the direction of radiation by reflecting the incident wave with [Formula: see text] phase shift, which requires the placement of the antenna at large enough height above the reflector to avoid destructive interference between the incident and the reflected waves. The AMCS is a metasurface constructed as periodic structure to produce reflection with 0° phase. This allows the antenna to be placed near the AMCS without destructive interference. Thus, the combined structure of the antenna and the AMCS reflector can have lower profile than that resulting in the case of employing ECS. The present work proposes a planar wideband antenna as well as an AMCS to produce unidirectional radiation with high gain over a wide frequency band. The proposed antenna is a planar octagon-shaped monopole patch with inverted U-slot and is fed through a coplanar waveguide (CPW). Both the radiating patch and the feeding line are printed on a single-sided substrate of type Rogers RT5880 of dimensions [Formula: see text] and thickness [Formula: see text]. The patch geometry is designed to maximize the radiation efficiency by cutting an inverted U-shaped slot with long base. The proposed AMCS consists of [Formula: see text] cells and has dimensions [Formula: see text]. The metallic patches of AMCS cells are printed on the top layer of a substrate of type Rogers' RO4003C of thickness [Formula: see text]. Both the proposed antenna and AMCS are fabricated for experimental evaluation of the performance of the radiating structure. It is shown by simulation and measurement that the proposed antenna when based on the proposed AMCS produces a realized gain of [Formula: see text] and total efficiency of greater than [Formula: see text] over the frequency band 3.5-6.5 GHz.

摘要

通过将主辐射器（简单天线）放置在反射器上方的合适高度，以减少后向辐射并增强前向辐射，可实现单向辐射，进而提高增益。用于提高增益的反射器通常是导电表面（ECS）或人工磁导体表面（AMCS）。ECS通过以[公式：见原文]相移反射入射波来统一辐射方向，这要求天线放置在反射器上方足够高的位置，以避免入射波和反射波之间的相消干涉。AMCS是一种构造为周期性结构的超表面，可产生0°相位的反射。这使得天线可以放置在AMCS附近而不会产生相消干涉。因此，天线与AMCS反射器的组合结构可以比采用ECS时的结构具有更低的外形。本文提出了一种平面宽带天线以及一种AMCS，以在宽频带上产生高增益的单向辐射。所提出的天线是一个带有倒U形槽的平面八边形单极贴片，并通过共面波导（CPW）馈电。辐射贴片和馈线都印刷在尺寸为[公式：见原文]、厚度为[公式：见原文]的Rogers RT5880型单面基板上。贴片几何形状通过切割具有长底边的倒U形槽来设计，以最大化辐射效率。所提出的AMCS由[公式：见原文]个单元组成，尺寸为[公式：见原文]。AMCS单元的金属贴片印刷在厚度为[公式：见原文]的Rogers' RO4003C型基板的顶层。所提出的天线和AMCS均已制作完成，用于对辐射结构的性能进行实验评估。通过仿真和测量表明，所提出的基于AMCS的天线在频带3.5 - 6.5 GHz上实现的增益为[公式：见原文]，总效率大于[公式：见原文]。

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本文引用的文献

1
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