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Articles de revues sur le sujet « LEAKY CHANNEL WAVEGUIDE »

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Auteur : Grafiati
Publié le 11 septembre 2023

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1

Qiu, Chencheng, Liu Liu, Botao Han, Jiachi Zhang, Zheng Li et Tao Zhou. « Broadband Wireless Communication Systems for Vacuum Tube High-Speed Flying Train ». Applied Sciences 10, no 4 (18 février 2020) : 1379. http://dx.doi.org/10.3390/app10041379.

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A vactrain (or vacuum tube high-speed flying train) is considered as a novel proposed rail transportation approach in the ultra-high-speed scenario. The maglev train can run with low mechanical friction, low air resistance, and low noise mode at a speed exceeding 1000 km/h inside the vacuum tube regardless of weather conditions. Currently, there is no research on train-to-ground wireless communication system for vactrain. In this paper, we first summarize a list of the unique challenges and opportunities associated with the wireless communication for vactrain, then analyze the bandwidth and Quality of Service (QoS) requirements of vactrain’s train-to-ground communication services quantitatively. To address these challenges and utilize the unique opportunities, a leaky waveguide solution with simple architecture but excellent performance is proposed for wireless coverage for vactrains. The simulation of the leaky waveguide is conducted, and the results show the uniform phase distribution along the horizontal direction of the tube, but also the smooth field distribution at the point far away from the leaky waveguide, which can suppress Doppler frequency shift, indicating that the time-varying frequency-selective fading channel could be approximated as a stationary channel. Furthermore, the train-to-ground wireless access architectures based on leaky waveguide are studied and analyzed. Finally, the moving scheme is adopted based on centralized, cooperative, cloud Radio Access Network (C-RAN), so as to deal with the extremely frequent handoff issue.
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Maims, Chris, John Hulme, Peter R. Fielden et Nicholas J. Goddard. « Grating coupled leaky waveguide micro channel sensor chips for optical analysis ». Sensors and Actuators B : Chemical 77, no 3 (juillet 2001) : 671–78. http://dx.doi.org/10.1016/s0925-4005(01)00773-0.

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3

Rohde, Charles A., et Christina J. Naify. « Detecting acoustic chirality with matched metamaterial vortex wave antennas ». Journal of the Acoustical Society of America 154, no 2 (1 août 2023) : 721–29. http://dx.doi.org/10.1121/10.0020533.

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ABSTRACT Acoustic communications often have limited data rates because of the intrinsically low frequencies. Exploring new spatial modes to increase data bandwidth at fixed frequency is a possible solution to this problem. Here, we demonstrate acoustic wave chirality transmission between two reciprocal metamaterial vortex wave antennas, generating and sensing transmitted acoustic wave chirality through the sub-wavelength geometry of the system. By adding an acoustic leaky wave surface to a ring resonator waveguide, acoustic vortex waves with positive or negative integer mode chirality are independently radiated and detected using a small number of microphones. Through computational simulation and experimental verification, using three-dimensional printed waveguides, we show that the vortex mode chirality can be transferred between two opposing acoustic vortex wave antennas across a small unguided air gap. We also show that emission into an external waveguide can provide long distance data transmission. This demonstrates the first use of metamaterial vortex wave antennas as chiral, mode multi-channel data transceivers.
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4

Wang, Hongwei, F. Richard Yu, Li Zhu, Tao Tang et Bin Ning. « Modeling of Communication-Based Train Control (CBTC) Radio Channel With Leaky Waveguide ». IEEE Antennas and Wireless Propagation Letters 12 (2013) : 1061–64. http://dx.doi.org/10.1109/lawp.2013.2279847.

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5

Kumar, A., V. Rastogi et K. S. Chiang. « Large-core single-mode channel waveguide based on geometrically shaped leaky cladding ». Applied Physics B 90, no 3-4 (19 janvier 2008) : 507–12. http://dx.doi.org/10.1007/s00340-007-2904-3.

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6

Malins, Chris, John Hulme, Peter R. Fielden et Nicholas J. Goddard. « Erratum to “Grating coupled leaky waveguide micro channel sensor chips for optical analysis” ». Sensors and Actuators B : Chemical 79, no 1 (septembre 2001) : 85. http://dx.doi.org/10.1016/s0925-4005(01)00900-5.

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7

Saleem, Asad, Min Wang, Guoxin Zheng et Xiaoyu Yin. « Spatial Characteristics of Wideband Channels Using Leaky Coaxial Cables in Tunnel Scenario ». International Journal of Antennas and Propagation 2019 (2 mai 2019) : 1–10. http://dx.doi.org/10.1155/2019/9374905.

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This paper presents the spatial domain and propagation characteristics of different wideband channels using leaky coaxial cables (LCXs) for underground environment at 1.8GHz corresponding to the Long Term Evolution for Metro (LTE-M) standards. Angular dispersion of the signal significantly affects the channel capacity, and it can be exactly predicted in both the near and far fields for underground environments by means of a multimode waveguide. A ray tracing phenomenon was exploited to visualize the wave propagation for different transmitter and receiver antenna distances by using the time domain approach for both the horizontally and vertically polarized LCXs. In order to achieve this goal, we characterized the power azimuth spectrum (PAS) and power angle profile (PAP) for different tunnel dimensions and found that the PAS can be demonstrated by a zero-mean Gaussian distribution whose angular spread (AS) is dependent on the transmitter-receiver distances and the tunnel dimensions. The results demonstrate that the horizontally polarized LCX has higher angular spread values than the vertically polarized one, and the correlation coefficient follows the decreasing function with the increment of angular spread.
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8

Zhang, Jiachi, Liu Liu, Botao Han, Zheng Li, Tao Zhou, Kai Wang, Dong Wang et Bo Ai. « Concepts on Train-to-Ground Wireless Communication System for Hyperloop : Channel, Network Architecture, and Resource Management ». Energies 13, no 17 (20 août 2020) : 4309. http://dx.doi.org/10.3390/en13174309.

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Hyperloop is envisioned as a novel transportation way with merits of ultra-high velocity and great traveling comforts. In this paper, we present some concepts on the key technologies dedicated to the train-to-ground communication system based on some prevailing fifth-generation communication (5G) technologies from three aspects: wireless channel, network architecture, and resource management. First, we characterize the wireless channel of the distributed antenna system (DAS) using the propagation-graph channel modelling theory. Simulation reveals that a drastic Doppler shift variation appears when crossing the trackside antenna. Hence, the leaky waveguide system is a promising way to provide a stable receiving signal. In this regard, the radio coverage is briefly estimated. Second, a cloud architecture is utilized to integrate several successive trackside leaky waveguides into a logical cell to reduce the handover frequency. Moreover, based on a many-to-many mapping relationship between distributed units (DUs) and centralized units (CUs), a novel access network architecture is proposed to reduce the inevitable handover cost by using the graph theory. Simulation results show that this scheme can yield a low handover cost. Then, with regards to the ultra-reliable and low latency communication (uRLLC) traffic, a physical resource block (PRB) multiplexing scheme considering the latency requirements of each traffic type is exploited. Simulation presents that this scheme can maximize the throughput of non-critical mission communication services while guaranteeing the requirements of uRLLC traffic. Finally, in terms of the non-critical mission communication services, two cache-based resource management strategies are proposed to boost the throughput and reduce the midhaul link burden by pre-fetching and post-uploading schemes. Simulation demonstrates that the cache-based schemes can boost the throughput dramatically.
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9

Torabi, Yalda, Gholamreza Dadashzadeh, Milad Hadeie, Homayoon Oraizi et Ali Lalbakhsh. « A Wide-Angle Scanning Sub-Terahertz Leaky-Wave Antenna Based on a Multilayer Dielectric Image Waveguide ». Electronics 10, no 17 (6 septembre 2021) : 2172. http://dx.doi.org/10.3390/electronics10172172.

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This paper presents a new layered dielectric leaky-wave antenna (LWA) for the sub-terahertz (THz) frequency range capable of efficient operation at the broadside with a wide beam scanning angle and stable gain. It consists of a conductor-backed alumina dielectric image line (DIL) with two different dielectric layers mounted on top of each other for performance improvement. The upper layer is a high permittivity RO6010 substrate to enhance the directivity as a superstrate and the lower layer is a low-permittivity RT/duroid 5880 substrate stacked on the alumina DIL to prevent the probable excitation of higher-order modes in the DIL channel. A 15-element linear array of radiating overlapped discs is used to mitigate the open stop-band (OSB) problem, fed by the mentioned waveguide, was designed and simulated at frequencies around 170 GHz. The dominant mode of the layered dielectric waveguide is perturbed by the infinite space harmonics generated by two sets of overlapped discs periodically sandwiched between the layers. It exhibited a relatively wide impedance bandwidth of 28.19% (157.5–206 GHz). Its radiation mechanism has been widely studied through simulations. The results revealed that the antenna provides a wide scanning capability through the broadside from −23° to 38°, covering the frequency range between 157.5 GHz and 201.5 GHz. For an array with 15 radiating elements, the simulated peak gain in the band is 15 dBi and the broadside gain is 13.6 dBi at 172 GHz.
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10

URANUS, H. P., H. J. W. M. HOEKSTRA et E. VAN GROESEN. « GALERKIN FINITE ELEMENT SCHEME WITH BAYLISS–GUNZBURGER–TURKEL-LIKE BOUNDARY CONDITIONS FOR VECTORIAL OPTICAL MODE SOLVER ». Journal of Nonlinear Optical Physics & ; Materials 13, no 02 (juin 2004) : 175–94. http://dx.doi.org/10.1142/s0218863504001840.

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A Galerkin finite element scheme furnished with 1st-order Bayliss–Gunzburger–Turkel-like boundary conditions is formulated to compute both the guided and leaky modes of anisotropic channel waveguides of non-magnetic materials with diagonal permittivity tensor. The scheme is formulated using transverse components of magnetic fields for nodal-based quadratic triangular elements. Results for some structures will be presented. The effectiveness of the boundary conditions will be illustrated using a step-index optical fiber with computational boundaries positioned near to the core, and the leaky modes computation of a leaky rib structure. In addition, a leaky mode solving of a six-hole "photonic crystal fiber" will be demonstrated. The computed results agree with their exact values (for optical fibers) and published results (for other structures).
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11

Geshiro, M., M. Hotta et T. Kameshima. « Coupled-mode analysis of leaky waves in channel waveguides consisting of anisotropic material ». IEEE Transactions on Microwave Theory and Techniques 41, no 6 (1993) : 1159–63. http://dx.doi.org/10.1109/22.238541.

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12

Tartarini, Giovanni, Ralf Stolte et Hagen Renner. « Experimental and theoretical analysis of leaky extraordinary modes in negative uniaxial channel waveguides ». Optics Communications 253, no 1-3 (septembre 2005) : 109–17. http://dx.doi.org/10.1016/j.optcom.2005.04.059.

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13

Hongwei Wang, F. R. Yu, Li Zhu, Tao Tang et Bin Ning. « Finite-State Markov Modeling of Leaky Waveguide Channels in Communication-Based Train Control (CBTC) Systems ». IEEE Communications Letters 17, no 7 (juillet 2013) : 1408–11. http://dx.doi.org/10.1109/lcomm.2013.052413.130792.

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14

Piao, Shengchun, Yang Dong, Zhiqiang Wu, Xiaohan Wang et Guangxue Zheng. « Geoacoustic inversion using very-low-frequency modal interference characteristics ». JASA Express Letters 3, no 6 (1 juin 2023). http://dx.doi.org/10.1121/10.0019705.

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This paper presents a modal-based geoacoustic inversion method adapted for a very-low-frequency leaky waveguide. It is applied to air gun data collected by a seismic streamer during the multi-channel seismic exploration experiment in the South Yellow Sea. The inversion is carried out by filtering the waterborne and bottom-trapped mode pairs from the received signal and comparing the modal interference features (waveguide invariant) to replica fields. The effective seabed models are inferred at two positions, and the two-way-travel time of basement interface reflected waves calculated using these models exhibit good agreement with geological exploration results.
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15

Li, Ling-Ling, Yong Wei, Chun-Lan Liu, Zhuo Ren, Ai Zhou, Zhi-Hai Liu et Yu Zhang. « Dual-channel fiber-optic SPR sensor with cascaded coaxial dual-waveguide D-type structure and microsphere structure ». Chinese Physics B, 27 octobre 2022. http://dx.doi.org/10.1088/1674-1056/ac9de3.

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Abstract To address the restriction of fiber-optic SPR sensors in the field of multi-sample detection, a novel dual-channel fiber-optic SPR sensor based on the cascade of coaxial dual-waveguide D-type structure and microsphere structure is proposed in this paper. The fiber side-polishing technique converts the coaxial dual-waveguide fiber into a D-type, and the evanescent wave in the ring core leaks, generating a D-type sensing region; the fiber optic fused ball push technology converts the coaxial dual waveguides into microspheres, and the stimulated cladding mode evanescent wave leaks, producing the microsphere sensing region. By injecting light into the coaxial dual-waveguide middle core alone, the sensor can realize single-stage sensing in the microsphere sensing area; it can also realize dual-channel sensing in the D-type sensing area and microsphere sensing area by injecting light into the ring core. The refractive index measurement ranges for the two channels are 1.333-1.365 and 1.375-1.405, respectively, with detection sensitivities of 981.56 nm/RIU and 4138 nm/RIU. The sensor combines wavelength division multiplexing and space division multiplexing technologies, presenting a novel research concept for multi-channel fiber SPR sensors.
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