Single-Layer Differential-Fed Wideband Metasurface Antenna Using Characteristic Mode Analysis

IF 1.2 4区计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Antennas and Propagation Pub Date : 2023-11-11 DOI:10.1155/2023/5184139

Chao Huang, Chen-Jiang Guo, Yi Yuan, Xia Ma, Jun Ding

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引用次数: 0

Abstract

A single-layer differential-fed (DF) wideband metasurface (MTS) antenna is proposed in this paper. As the prototype, a three-by-three MTS formed by identical rectangular patches is investigated at first. We observe that there are many unwanted higher-order modes (HOMs) resonating near the wanted fundamental mode. Two probes with differential signals feed MTS on its centerline to suppress the majority of HOMs. The remaining HOM can be removed from the discussed frequency range by modifying the prototype MTS to a nonuniform structure. Then, the optimal feeding positions (FPs) are determined by a quantitative prediction of the impendence bandwidth (IBW) without any physical feeds involved. The processes of HOMs suppression and FPs determination are based on characteristic mode analysis with the virtual probes. Moreover, two interdigital capacitor plates are loaded on the probes to improve the impedance matching of the antenna. Finally, the proposed DF MTS antenna is fabricated and measured. The measured −10-dB IBW is 18.4% (4.93 to 5.93 GHz) with broadside radiation, stable high gains, and front-to-back ratios better than 21 dB.

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基于特征模态分析的单层差分馈电宽带超表面天线

提出了一种单层差分馈电宽带超表面(MTS)天线。首先研究了由相同矩形块构成的3 × 3 MTS作为原型。我们观察到在所需基模附近有许多不需要的高阶模(HOMs)共振。两个带差分信号的探头在其中心线上馈送MTS以抑制大多数HOMs。通过将原型MTS修改为非均匀结构，可以将剩余的homm从所讨论的频率范围内移除。然后，在不涉及任何物理馈电的情况下，通过对阻抗带宽(IBW)的定量预测来确定最佳馈电位置(FPs)。利用虚拟探针进行特征模态分析，实现了对高功率脉冲的抑制和FPs的测定。此外，在探头上加载了两个数字间电容板，以改善天线的阻抗匹配。最后，对所提出的DF - MTS天线进行了制作和测量。测量到的−10 dB IBW为18.4% (4.93 ~ 5.93 GHz)，具有宽侧辐射、稳定的高增益和优于21 dB的前后比。

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

International Journal of Antennas and Propagation ENGINEERING, ELECTRICAL & ELECTRONIC-TELECOMMUNICATIONS

CiteScore

3.10

自引率

13.30%

发文量

158

审稿时长

3.8 months

期刊介绍： International Journal of Antennas and Propagation publishes papers on the design, analysis, and applications of antennas, along with theoretical and practical studies relating the propagation of electromagnetic waves at all relevant frequencies, through space, air, and other media. As well as original research, the International Journal of Antennas and Propagation also publishes focused review articles that examine the state of the art, identify emerging trends, and suggest future directions for developing fields.