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学者姓名：周子恒
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Abstract ：
The development of high-performance optically transparent radio frequency (RF) radiators is limited by the intrinsic loss issue of transparent conductive films (TCFs). Instead of pursuing expensive endeavors to improve the TCFs’ electrical properties, this study introduces an innovative approach that leverages leaky-wave mode manipulation to mitigate the TCFs’ attenuating effect and maximize the RF radiation. Our finding reveals that the precise control of the mode confinement on glass-coated TCFs can create a low-attenuation window for leaky-wave propagation, where the total attenuation caused by TCF dissipation and wave leakage is effectively reduced. The observed low-attenuation leaky-wave state on lossy TCFs originates from the delicate balance between wave leakage and TCF dissipation, attained at a particular glass cladding thickness. By leveraging the substantially extended radiation aperture achieved under suppressed wave attenuation, this study develops an optically transparent antenna with an enhanced endfire realized gain exceeding 15 dBi and a radiation efficiency of 66%, which is validated to offer competitive transmission performance for advancing ubiquitous wireless communication and sensing applications. © 2024 THE AUTHORS
Keyword ：
Antennas Antennas Endfire radiation Endfire radiation Low attenuation Low attenuation Material losses Material losses Transparent conductive films Transparent conductive films
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| GB/T 7714 | Zhou, Z. , Zhang, Y. , Zheng, Y. et al. The Low-Attenuation Endfire Leaky-Wave State on an Optically Transparent Lossy Film [J]. | Engineering , 2024 , 43 : 72-80 . |
| MLA | Zhou, Z. et al. "The Low-Attenuation Endfire Leaky-Wave State on an Optically Transparent Lossy Film" . | Engineering 43 (2024) : 72-80 . |
| APA | Zhou, Z. , Zhang, Y. , Zheng, Y. , Chen, K. , Gao, Y. , Ge, Y. et al. The Low-Attenuation Endfire Leaky-Wave State on an Optically Transparent Lossy Film . | Engineering , 2024 , 43 , 72-80 . |
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This paper presents a visualized approach to efficiently designing an antenna decoupling network constructed by cascaded coupled transmission lines (CTLs). The cascaded CTL architecture is explored to decouple tightly-packed antenna pairs with extremely small feed point spacing, circumventing the narrow bandwidth and loss issues associated with resonant decoupling structures. To facilitate the fast CTL design, we propose to analytically map the CTLs’ odd-mode (OM) and even-mode (EM) characteristic impedances onto the Smith charts of the antenna’s OM and EM input impedances. By leveraging this approach, the required CTL’s OM and EM parameters for antenna decoupling can be directly determined without relying on intricate optimization or try-and-error processes. To demonstrate the effectiveness of our methodology, a printed monopole antenna pair with an element center-to-center spacing of merely 0.1λ0 (at 3.5 GHz) is prototyped, which presents a 15-dB isolation bandwidth of 18% and a total efficiency exceeding 85% over this bandwidth. The proposed decoupling approach substantially simplifies the design of compact high-isolation antenna pairs which would have important applications in MIMO communication systems. IEEE
Keyword ：
Antenna decoupling Antenna decoupling Antennas Antennas Coplanar waveguides Coplanar waveguides coupled transmission line coupled transmission line Couplings Couplings Impedance Impedance MIMO communication MIMO communication multiple-input multiple-output (MIMO) technology multiple-input multiple-output (MIMO) technology odd and even modes odd and even modes Substrates Substrates Visualization Visualization visualized design visualized design
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| GB/T 7714 | Zhou, Z. , Cheng, Z. , Zhang, Z. et al. Visualized Design of Antenna Decoupling Networks Constructed by Cascaded Coupled Lines [J]. | IEEE Transactions on Antennas and Propagation , 2024 , 72 (6) : 1-1 . |
| MLA | Zhou, Z. et al. "Visualized Design of Antenna Decoupling Networks Constructed by Cascaded Coupled Lines" . | IEEE Transactions on Antennas and Propagation 72 . 6 (2024) : 1-1 . |
| APA | Zhou, Z. , Cheng, Z. , Zhang, Z. , Ge, Y. , Chen, Z.D. . Visualized Design of Antenna Decoupling Networks Constructed by Cascaded Coupled Lines . | IEEE Transactions on Antennas and Propagation , 2024 , 72 (6) , 1-1 . |
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Different from the reflective approach of the carpet cloak designed to conceal surface irregularities on highly reflective surfaces, the transmission invisibility cloak, often capable of achieving perfect invisibility, operates within a transmission geometry. In this configuration, the cloaking mechanism ensures that an object neither reflects nor refracts incoming waves in free space, presenting opportunities for more versatile applications, though with the requirement for intricate designs. This paper introduces a novel methodology for designing a transmissive invisibility cloak, employing a simplified combination structure of two phase-gradient metasurfaces based on the generalized Snell’s law. Initially, we designed a highly transparent metasurface for the millimeter-wave band to yield diverse phase gradients. We confirmed the effectiveness of this metasurface through the observation of abnormal refraction. Then, through a deliberate arrangement of these phase gradients, we construct a transmissive invisibility cloak that guides electromagnetic waves around the cloaked region. Simulations and experimental measurements conducted under plane-wave conditions demonstrate the cloak’s effectiveness and practical applicability. The ensuing comparative investigations of results among free space, uncloaked objects, and cloaked objects validate the expected cloaking effect, offering valuable insights into the design and functionality of transmissive invisibility cloaks. © 2024 IOP Publishing Ltd.
Keyword ：
abnormal refraction abnormal refraction cloak cloak generalized Snell’s law generalized Snell’s law incident wave incident wave plane wave plane wave
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| GB/T 7714 | Wang, Y. , Ge, Y. , Zhou, Z. et al. Transmissive invisibility cloak using phase gradient metasurfaces [J]. | Physica Scripta , 2024 , 99 (8) . |
| MLA | Wang, Y. et al. "Transmissive invisibility cloak using phase gradient metasurfaces" . | Physica Scripta 99 . 8 (2024) . |
| APA | Wang, Y. , Ge, Y. , Zhou, Z. , Chen, Z.D. . Transmissive invisibility cloak using phase gradient metasurfaces . | Physica Scripta , 2024 , 99 (8) . |
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拓扑优化方法因其高自由度特点在器件智能设计领域发挥重要作用,在微波工程课程中引入器件拓扑优化实验可提升课程前沿性.该实验通过天线匹配网络拓扑优化提高天线的辐射性能:首先采用阻抗矩阵方法对天线匹配网络的响应进行理论建模,随后利用遗传算法对网络进行拓扑优化,实现天线工作频带的智能按需设计.结果表明,经过拓扑优化的微波天线可在指定的频带内实现良好的阻抗匹配,达到95％以上的最大天线效率.该实验展示了基于阻抗矩阵理论的微波网络拓扑优化方法,为微波与天线相关课程提供了一项具备综合性、前沿性的课题训练项目.
Keyword ：
天线匹配网络 天线匹配网络 拓扑优化 拓扑优化 智能设计 智能设计 阻抗矩阵 阻抗矩阵
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| GB/T 7714 | 周子恒 , 苏梓暄 , 周彦峰 et al. 天线匹配网络拓扑优化:理论建模与数值实验 [J]. | 实验技术与管理 , 2024 , 41 (11) : 1-7 . |
| MLA | 周子恒 et al. "天线匹配网络拓扑优化:理论建模与数值实验" . | 实验技术与管理 41 . 11 (2024) : 1-7 . |
| APA | 周子恒 , 苏梓暄 , 周彦峰 , 张哲晨 , 许志猛 , 陈志璋 . 天线匹配网络拓扑优化:理论建模与数值实验 . | 实验技术与管理 , 2024 , 41 (11) , 1-7 . |
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Large-element-spacing (LES) antenna arrays present an attractive proposition with their cost-effectiveness and simplified structures. However, they often encounter the challenge of high-level grating lobes. This paper proposes a novel meta-lens methodology to effectively address the grating lobe issue in fixed-beam LES arrays. The proposed approach involves strategically positioning a meta-lens above the LES arrays at a suitable vertical distance. This setup enables precise manipulation and compensation of the near-field phase, resulting in the suppression or elimination of grating lobes without introducing additional design complexity. Comprehensive theoretical analyses, meticulous design calculations employing efficient numerical methods, rigorous field simulations, and practical experiments are conducted. The results demonstrate that our meta-lens solution achieves significant grating-lobe suppressions and substantial gain enhancements with only a marginal increase in system profile or volume. The proposed meta-lens approach is versatile and applicable to various LES antenna arrays, including sparse/thinned arrays, regardless of their size, element spacing, and configuration (uniform or non-uniform, periodic or aperiodic). Copyright © 2024 The Author(s).
Keyword ：
Gain enhancement Gain enhancement Grating-lobe suppression Grating-lobe suppression Large-element-spacing antenna array Large-element-spacing antenna array Meta-lens Meta-lens Metasurface Metasurface Sparse array Sparse array Thinned array Thinned array
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| GB/T 7714 | Wang, Z. , Lin, S. , Ge, Y. et al. Unlock the Potentials of Large-Element-Spacing Arrays: A Meta-Lens Solution for Grating-Lobe Suppression and Gain Enhancement [J]. | Electromagnetic Science , 2024 , 2 (4) . |
| MLA | Wang, Z. et al. "Unlock the Potentials of Large-Element-Spacing Arrays: A Meta-Lens Solution for Grating-Lobe Suppression and Gain Enhancement" . | Electromagnetic Science 2 . 4 (2024) . |
| APA | Wang, Z. , Lin, S. , Ge, Y. , Chen, Z. , Zhao, J. , Chen, J. et al. Unlock the Potentials of Large-Element-Spacing Arrays: A Meta-Lens Solution for Grating-Lobe Suppression and Gain Enhancement . | Electromagnetic Science , 2024 , 2 (4) . |
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Non-resonant partially reflective surface (PRS) antennas (PRSAs) offer high-gain performance, but their design typically requires extensive electromagnetic simulations to obtain near-field phase distributions, leading to time-consuming processes, especially for complex or large antennas. This letter presents a novel analytical design method that significantly simplifies the design of phase-correcting surfaces (PCSs) for nonresonant PRSAs. By introducing a new design strategy based on a ray-tracing approach, we derive a set of analytical formulas for two PCS configurations: one utilizing a single superstrate that integrates both PRS and PCS functionalities, and another employing distinct PRS and PCS layers. Using these formulas, we designed two non-resonant PRSAs, and both simulated and experimental results demonstrate comparable gain performance to those obtained using Ansys HFSS. This approach reduces the dependence on computationally intensive simulations, offering a more efficient pathway for the design of high-performance nonresonant PRSAs, thereby advancing the accessibility and practicality of antenna design methodologies. © 2002-2011 IEEE.
Keyword ：
Nonresonant PRS antenna Nonresonant PRS antenna partially reflective surface (PRS) partially reflective surface (PRS) phase-correcting surface (PCS) phase-correcting surface (PCS) ray-tracing method ray-tracing method
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| GB/T 7714 | Zheng, X. , Ge, Y. , Li, G. et al. Efficient Analytical Design Strategy for High-Gain Non-resonant Partially-Reflective-Surface Antennas [J]. | IEEE Antennas and Wireless Propagation Letters , 2024 . |
| MLA | Zheng, X. et al. "Efficient Analytical Design Strategy for High-Gain Non-resonant Partially-Reflective-Surface Antennas" . | IEEE Antennas and Wireless Propagation Letters (2024) . |
| APA | Zheng, X. , Ge, Y. , Li, G. , Zhou, Z. , Matekovits, L. , Chen, Z. . Efficient Analytical Design Strategy for High-Gain Non-resonant Partially-Reflective-Surface Antennas . | IEEE Antennas and Wireless Propagation Letters , 2024 . |
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Abstract ：
Different from the reflective approach of the carpet cloak designed to conceal surface irregularities on highly reflective surfaces, the transmission invisibility cloak, often capable of achieving perfect invisibility, operates within a transmission geometry. In this configuration, the cloaking mechanism ensures that an object neither reflects nor refracts incoming waves in free space, presenting opportunities for more versatile applications, though with the requirement for intricate designs. This paper introduces a novel methodology for designing a transmissive invisibility cloak, employing a simplified combination structure of two phase-gradient metasurfaces based on the generalized Snell's law. Initially, we designed a highly transparent metasurface for the millimeter-wave band to yield diverse phase gradients. We confirmed the effectiveness of this metasurface through the observation of abnormal refraction. Then, through a deliberate arrangement of these phase gradients, we construct a transmissive invisibility cloak that guides electromagnetic waves around the cloaked region. Simulations and experimental measurements conducted under plane-wave conditions demonstrate the cloak's effectiveness and practical applicability. The ensuing comparative investigations of results among free space, uncloaked objects, and cloaked objects validate the expected cloaking effect, offering valuable insights into the design and functionality of transmissive invisibility cloaks.
Keyword ：
abnormal refraction abnormal refraction cloak cloak generalized Snell's law generalized Snell's law incident wave incident wave plane wave plane wave
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| GB/T 7714 | Wang, Yufang , Ge, Yuehe , Zhou, Ziheng et al. Transmissive invisibility cloak using phase gradient metasurfaces [J]. | PHYSICA SCRIPTA , 2024 , 99 (8) . |
| MLA | Wang, Yufang et al. "Transmissive invisibility cloak using phase gradient metasurfaces" . | PHYSICA SCRIPTA 99 . 8 (2024) . |
| APA | Wang, Yufang , Ge, Yuehe , Zhou, Ziheng , Chen, Zhizhang (David) . Transmissive invisibility cloak using phase gradient metasurfaces . | PHYSICA SCRIPTA , 2024 , 99 (8) . |
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Abstract ：
This article presents a visualized approach to efficiently designing an antenna decoupling network constructed by cascaded coupled transmission lines (CTLs). The cascaded CTL architecture is explored to decouple tightly-packed antenna pairs with extremely small feed point spacing, circumventing the narrow bandwidth and loss issues associated with resonant decoupling structures. To facilitate the fast CTL design, we propose to analytically map the CTLs' odd-mode (OM) and even-mode (EM) characteristic impedances onto the Smith charts of the antenna's OM and EM input impedances. By leveraging this approach, the required CTL's OM and EM parameters for antenna decoupling can be directly determined without relying on intricate optimization or try-and-error process. To demonstrate the effectiveness of our methodology, a printed monopole antenna pair with an element center-to-center spacing of merely 0.1.0 (at 3.5 GHz) is prototyped, which exhibits a 15-dB isolation bandwidth of 18% and a total efficiency exceeding 85% over this bandwidth. The proposed decoupling approach substantially simplifies the design of compact high-isolation antenna pairs which would have important applications in multiple-input multiple-output (MIMO) communication systems.
Keyword ：
Antenna decoupling Antenna decoupling coupled transmission line (CTL) coupled transmission line (CTL) multiple-input multiple-output (MIMO) technology multiple-input multiple-output (MIMO) technology odd and even modes odd and even modes visualized design visualized design
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| GB/T 7714 | Zhou, Ziheng , Cheng, Zubin , Zhang, Zhechen et al. Visualized Design of Antenna Decoupling Networks Constructed by Cascaded Coupled Lines [J]. | IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION , 2024 , 72 (6) : 4744-4753 . |
| MLA | Zhou, Ziheng et al. "Visualized Design of Antenna Decoupling Networks Constructed by Cascaded Coupled Lines" . | IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 72 . 6 (2024) : 4744-4753 . |
| APA | Zhou, Ziheng , Cheng, Zubin , Zhang, Zhechen , Ge, Yuehe , Chen, Zhizhang . Visualized Design of Antenna Decoupling Networks Constructed by Cascaded Coupled Lines . | IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION , 2024 , 72 (6) , 4744-4753 . |
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A novel waveguide band-stop filter is developed and presented. This design incorporates the integration of one or two metasurface sections onto the broad wall, effectively yielding a robust stopband characteristic within a broad passband. The underlying mechanism responsible for generating the stopband is elucidated. Simulation results demonstrate a good stopband within the wide TE10 passband of the standard rectangular waveguide WR-75. This proposed filter exhibits advantages of a straightforward structure, simplified design process, ease of fabrication, convenient mounting, and superior bandstop performance. © 2024 IEEE.
Keyword ：
Band-stop filter Band-stop filter metasurface metasurface waveguide filter waveguide filter
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| GB/T 7714 | Ao, Y. , Ge, Y. , Chen, Z.D. et al. Novel Rectangular Waveguide Band-Stop Filters with PMC MSSs in the Broad Wall [未知]. |
| MLA | Ao, Y. et al. "Novel Rectangular Waveguide Band-Stop Filters with PMC MSSs in the Broad Wall" [未知]. |
| APA | Ao, Y. , Ge, Y. , Chen, Z.D. , Zhou, Z. . Novel Rectangular Waveguide Band-Stop Filters with PMC MSSs in the Broad Wall [未知]. |
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The development of high-performance optically transparent radio frequency (RF) radiators is limited by the intrinsic loss issue of transparent conductive films (TCFs). Instead of pursuing expensive endeavors to improve the TCFs' electrical properties, this study introduces an innovative approach that leverages leaky-wave mode manipulation to mitigate the TCFs' attenuating effect and maximize the RF radiation. Our finding reveals that the precise control of the mode confinement on glass-coated TCFs can create a low-attenuation window for leaky-wave propagation, where the total attenuation caused by TCF dissipation and wave leakage is effectively reduced. The observed low-attenuation leaky-wave state on lossy TCFs originates from the delicate balance between wave leakage and TCF dissipation, attained at a particular glass cladding thickness. By leveraging the substantially extended radiation aperture achieved under suppressed wave attenuation, this study develops an optically transparent antenna with an enhanced endfire realized gain exceeding 15 dBi and a radiation efficiency of 66%, which is validated to offer competitive transmission performance for advancing ubiquitous wireless communication and sensing applications. (c) 2024 THE AUTHORS. Published by Elsevier LTD on behalf of Chinese Academy of Engineering and Higher Education Press Limited Company. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keyword ：
Antennas Antennas Endfire radiation Endfire radiation Low attenuation Low attenuation Material losses Material losses Transparent conductive films Transparent conductive films
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| GB/T 7714 | Zhou, Ziheng , Zhang, Yongjian , Zheng, Yilin et al. The Low-Attenuation Endfire Leaky-Wave State on an Optically Transparent Lossy Film [J]. | ENGINEERING , 2024 , 43 : 72-80 . |
| MLA | Zhou, Ziheng et al. "The Low-Attenuation Endfire Leaky-Wave State on an Optically Transparent Lossy Film" . | ENGINEERING 43 (2024) : 72-80 . |
| APA | Zhou, Ziheng , Zhang, Yongjian , Zheng, Yilin , Chen, Ke , Gao, Yueming , Ge, Yuehe et al. The Low-Attenuation Endfire Leaky-Wave State on an Optically Transparent Lossy Film . | ENGINEERING , 2024 , 43 , 72-80 . |
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