ORIGINAL RESEARCH article
Front. Phys.
Sec. Optics and Photonics
Volume 13 - 2025 | doi: 10.3389/fphy.2025.1638385
This article is part of the Research TopicAcquisition and Application of Multimodal Sensing Information, Volume IIIView all articles
High-Frequency Gain Enhancement of Broadband Metasurface Antenna With Parasitic Patches Using Characteristic Mode Analysis
Provisionally accepted
- 1Shanxi Datong University, Datong, China
- 2Beijing Institute of Technology, Beijing, China
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This paper presents a broadband metasurface (MTS) antenna using characteristic mode analysis (CMA) method for highfrequency gain enhancement. Firstly, by loading four parasitic patches around the 3×3 squared patches on the upper layer, the broader potential bandwidth of the characteristic modes of the MTS is achieved, and the impedance matching of the antenna is improved. The bandwidth of the proposed antenna can then be broadened. However, the high-frequency realized gain of the antenna is significantly lower than that of the low-frequency because the mode at high operating band has radiation null at the boresight direction. After that, two slots along x-axis are loaded in part of the unit cells of the MTS according CMA for mode optimization. Then the optimized higher order modes have broadside radiation patterns at high frequency, and the high-frequency realized gain of the proposed antenna is increased significantly. Especially, the realized gain at 7 GHz in boresight direction is enhanced from -1.17 dBi to 9.5 dBi. The simulated and experiment results show that the proposed antenna realizes 55.2% (4.66 GHz-8.22 GHz) impedance bandwidth for |S11| ≤ -10 dB with a very flat gain of 7-10 dBi.
Keywords: broadband, characteristic modes analysis (CMA), metasurface, Parasitic patches, flat gain
Received: 30 May 2025; Accepted: 30 Jun 2025.
Copyright: © 2025 Liu, Yang, Gao, Dong, Guo, Xu, Meng, Hu and Feng. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Caixia Feng, Shanxi Datong University, Datong, China
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