Customized meta-waveguide for phase and absorption

Yan, Bo; Yu, Bo; Xu, Jianguo; Li, Yukun; Wang, Zhigang; Wang, Zhengxin; Ma, Haoyu; Gong, Cheng

doi:10.1088/1361-6463/ac1466

Cited by 10 publications

(6 citation statements)

References 36 publications

(29 reference statements)

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“…Several studies have shown that mitochondrial dynamics are required for lifespan extension in different long-lived conditions (Burkewitz et al, 2015;Weir et al, 2017;Zhang et al, 2019e), demonstrating their important roles in the aging process. Indeed, altered mitochondrial dynamics, such as defective mitochondrial fission, have been linked with cellular senescence (Yu et al, 2020a). Due to direct regulation by mitochondrial fusionfission dynamics, changes in mitochondrial morphology have also been reported to be associated with aging.…”

Section: Mitochondrial Dynamicsmentioning

confidence: 99%

Biomarkers of aging

Bao

Cao

Chen

et al. 2023

Sci. China Life Sci.

130

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Aging biomarkers are a combination of biological parameters to (i) assess age-related changes, (ii) track the physiological aging process, and (iii) predict the transition into a pathological status. Although a broad spectrum of aging biomarkers has been developed, their potential uses and limitations remain poorly characterized. An immediate goal of biomarkers is to help us answer the following three fundamental questions in aging research: How old are we? Why do we get old? And how can we age slower? This review aims to address this need. Here, we summarize our current knowledge of biomarkers developed for cellular, organ, and organismal levels of aging, comprising six pillars: physiological characteristics, medical imaging, histological features, cellular alterations, molecular changes, and secretory factors. To fulfill all these requisites, we propose that aging biomarkers should qualify for being specific, systemic, and clinically relevant. Supporting Information The supporting information is available online at 10.1007/s11427-023-2305-0. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Section: Mitochondrial Dynamicsmentioning

confidence: 99%

Biomarkers of aging

Bao

Cao

Chen

et al. 2023

Sci. China Life Sci.

130

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“…Based on the equivalent medium theory [39,40], periodically arranged I-shaped resonators can be regarded as an equivalent homogeneous ferrite layer, as illustrated in Figure 4b. According to Maxwell's equations and previous research [37,38,41], transverse electromagnetic fields within the waveguide induce currents throughout the I-shaped resonators. These induced currents stimulate an induced magnetic field, and the magnetic field's intensity |H ind | is determined by the dimensions of the metallic and thin-film resistors.…”

Section: Principle and Designmentioning

confidence: 99%

“…In our previous work [41], the authors demonstrated that the phase constant β of a metamaterial waveguide, based on the equivalented ferrite-dielectric-gold laminated structure, is correlated with the induced magnetic field intensity |H ind |. Meanwhile, the intensity of the induced magnetic field is determined by the dimensions of the metallic and thin-film resistors within the I-shaped resonators.…”

Section: Principle and Designmentioning

confidence: 99%

Terahertz Metamaterial Waveguide with I-Shaped Resonators for Phase and Absorption Modulation

Yang

Song

et al. 2023

Photonics

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In terahertz communication systems, amplifiers and other components can induce non-linear distortion in terms of amplitude and phase, resulting in system performance degradation. This paper presents a terahertz metamaterial waveguide to mitigate amplitude and phase distortions in some terahertz systems. A simple method based on free-space analysis is proposed for designing metamaterial waveguides in an enclosed space. The quasi-periodic metamaterial structures, which feature I-shaped resonant patterns, are integrated onto the inner walls of rectangular waveguides. The phase and amplitude of electromagnetic waves within the waveguide can be modulated by varying the dimensions and number of these resonators. Utilizing the effective medium theory and the equivalent circuits, the metamaterial waveguide’s phase and absorption modulation mechanisms are analyzed. Based on the proposed structure, a metamaterial waveguide with I-shaped resonators is designed and fabricated, and its abilities to modulate the phase and absorption of terahertz waves around 0.2 THz are demonstrated.

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“…In general, satellite antennas should have high efficiency, high mechanical strength, good thermal conductivity and excellent irradiation resistance. The all-metal waveguide antenna is a good candidate to meet all of the above requirements and it also has the advantages of large bandwidth and pure polarization [3,4].…”

Section: Introductionmentioning

confidence: 99%

All-metal cavity antenna with light weight, high efficiency and circular polarization for satellite platform applications

Luo

Zeng

et al. 2023

J. Phys. D: Appl. Phys.

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In this paper, a light-weight high-efficiency circularly polarized all-metal antenna design method is presented for the satellite industry applications. The proposed antenna is composed of a rectangular waveguide feeding, a high-order mode cavity and a metasurface circular polarizer (MCP). The cavity high-order mode TE440 is directly exited by four coupling slots in the waveguide. The MCP is placed on the cavity to generate the circularly polarized (CP) radiation. Due to the introduction of high-order mode technology and MCP, all metal walls inside the antenna can be removed, which are necessary in the conventional waveguide structure, and then a significant weight is reduced. To reflect the weight advantage, a conventional metal wall-loaded waveguide antenna with the same size is designed. The measured results show that the proposed antenna has the wider impedance and axial ratio bandwidths, and the higher radiation efficiency. Particularly, the proposed antenna is 40% lighter than the comparative one, indicating that it is more applicable for a satellite platform with limited loading capacity.

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Customized meta-waveguide for phase and absorption

Cited by 10 publications

References 36 publications

Biomarkers of aging

Biomarkers of aging

Terahertz Metamaterial Waveguide with I-Shaped Resonators for Phase and Absorption Modulation

All-metal cavity antenna with light weight, high efficiency and circular polarization for satellite platform applications

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