- 标题
- 摘要
- 关键词
- 实验方案
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Direct Chip-to-Waveguide Transition Realized with Wire Bonding for 140 GHz to 220 GHz G-Band
摘要： This work presents a method to realize a direct chip-to-waveguide transition by means of commercial wire-bonding tools. A straight E-field probe is formed by a freely suspended bondwire and mounted to a standard RF pad on-chip. In contrast to conventional approaches, no additional dedicated substrate or large integrated radiating structure are necessary. A preliminary analysis is performed to illustrate the basic feasibility and a WR-05 prototype module, with dedicated test chip, is designed and optimized for a frequency range of 140 GHz to 220 GHz (G-Band). The measured return loss of a back-to-back configuration is above 10 dB, while the deembedded absolute loss of a single transition is between 0.4 dB and 1 dB, both within the complete waveguide bandwidth of 80 GHz. The demonstrated performance is very well suited to ultra-wideband communication systems or general-purpose mm-wave components.
关键词： WR-5,transition,bondwire,packaging,mm-wave,propagation,matching,waveguide,G band
更新于2025-09-23 15:19:57
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Investigation and Analysis of Data Rate for Free Space Optical Communications System Under Dust Conditions
摘要： In this study, the performance of free-space optics (FSO) communication link under dust conditions was analysed. The data were modulated by the non-return-to-zero technique. The optical link was investigated with varying data rates under the effect of dust conditions. The performance of the FSO system was tested in terms of the bit error rate (BER), Q-factor and received power at the maximum link. Simulation results were obtained to compare between two transmit data rates (0.3 and 0.7 Gbps). The system has a high BER at a high data rate. In the meantime, it has a high Q-factor at a low data rate.
关键词： OptiSystem 7.0,Atmospheric transmittance,FSO,BER,Dust concentration,Attenuation,Q-factor,Propagation,WDM
更新于2025-09-23 15:19:57
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In-situ calibration technology of liquid level with precise laser ranging
摘要： This letter develops a distributed algorithm for relay pairing in bandwidth exchange (BE) based cooperative forwarding scenarios, where each node can delegate a fraction of its allocated resources to a neighboring node as an incentive for relaying. Determining the relay pairs that maximize the overall network utility yields a non-bipartite matching problem, which incurs a considerable computational load when implemented in a centralized way. To resolve this challenge, we use a message-passing framework to develop an efficient distributed solution. Simulation results verify that the proposed algorithm outperforms existing approaches.
关键词： bandwidth exchange,message passing algorithm,Affinity propagation,cooperative forwarding
更新于2025-09-23 15:19:57
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[IEEE 2019 Innovations in Power and Advanced Computing Technologies (i-PACT) - Vellore, India (2019.3.22-2019.3.23)] 2019 Innovations in Power and Advanced Computing Technologies (i-PACT) - A Survey on Efficient Converter Driver Techniques for LED LIGHTING Applications
摘要： This letter develops a distributed algorithm for relay pairing in bandwidth exchange (BE) based cooperative forwarding scenarios, where each node can delegate a fraction of its allocated resources to a neighboring node as an incentive for relaying. Determining the relay pairs that maximize the overall network utility yields a non-bipartite matching problem, which incurs a considerable computational load when implemented in a centralized way. To resolve this challenge, we use a message-passing framework to develop an efficient distributed solution. Simulation results verify that the proposed algorithm outperforms existing approaches.
关键词： bandwidth exchange,message passing algorithm,Affinity propagation,cooperative forwarding
更新于2025-09-23 15:19:57
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Optical Guided Modes with Arbitrary Propagation Constants in the Plane Array of Metallic Waveguides
摘要： The optical guided modes in the plane array of metallic cylindrical waveguides are considered. The case of the arbitrary propagation constant β is studied. Thus far, only the case β = 0 has been investigated in literature. We have revealed that just for β ≠ 0, the new branch of guided modes appears. The case of silver waveguides is investigated in details. It is found that, for sufficiently small β, the dispersion curve for the guided mode is located below the transmission window. We found the conditions for which the dispersion curve with β ≠ 0 is located completely within the transmission window. The multiple scattering formalism based on the expansion in the vector cylinder harmonics is employed. The cases of copper and gold waveguides are discussed briefly.
关键词： metallic waveguides,propagation constant,multiple scattering formalism,optical guided modes,silver waveguides
更新于2025-09-23 15:19:57
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Dispersion properties of uniform trapezoidal optical waveguides
摘要： A method for calculation of the propagation constant of guided modes in the optical waveguides with trapezoidal cross-sections is proposed. The method enables to calculate a propagation constant correction factor that arises due to perturbations of the cross-section of a reference rectangular waveguide. The correction factor is analytically calculated within the framework of the coupled-mode theory. A re?ned form of the coupling coe?cient is obtained owing to the application of a concept of e?ective excitation sources and accurate account of boundary conditions. An impact of the waveguide cross-section shape on its dispersion properties is analysed. The necessity to take into account the proposed form of the coupling coe?cient is demonstrated by comparison of the simulation results with other methods of dispersion calculation.
关键词： coupled-mode theory,optical waveguides,trapezoidal cross-sections,dispersion properties,propagation constant
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE International Electron Devices Meeting (IEDM) - San Francisco, CA, USA (2019.12.7-2019.12.11)] 2019 IEEE International Electron Devices Meeting (IEDM) - Integrated DFB Laser Diode and High-efficiency Mach-Zehnder Modulator using Membrane III-V Semiconductors on Si Photonics Platform
摘要： This paper presents a 3-D statistical channel impulse response (IR) model for urban line of sight (LOS) and non-LOS channels developed from 28- and 73-GHz ultrawide-band propagation measurements in New York City, useful in the design of 5G wireless systems that will operate in both the ultra-high frequency/microwave and millimeter-wave (mmWave) spectrum to increase channel capacities. A 3GPP-like stochastic IR channel model is developed from measured power delay profiles, angle of departure, and angle of arrival power spectra. The extracted statistics are used to implement a channel model and simulator capable of generating 3-D mmWave temporal and spatial channel parameters for arbitrary mmWave carrier frequency, signal bandwidth, and antenna beamwidth. The model presented here faithfully reproduces realistic IRs of measured urban channels, supporting air interface design of mmWave transceivers, filters, and multi-element antenna arrays.
关键词： 28 GHz,multipath,time cluster spatial lobe (TCSL),spatial lobe (SL),statistical simulator,5G,spatial channel model (SCM),73 GHz,Channel model,millimeter-wave (mmWave) propagation,3-D ray-tracing,time cluster (TC),impulse response (IR)
更新于2025-09-23 15:19:57
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Laser array beam propagation through liver tissue
摘要： Laser array beam propagating through mouse liver tissue is investigated. The turbulence power spectrum of the liver tissue is employed in the extended Huygens–Fresnel method to obtain an optical intensity pro?le and beam broadening at the observation point in biological liver tissue. Variations of the beam pro?le and the beam broadening are simulated based on the number of beamlets, source size, wavelength and the ring radius of the array. A biological tissue, illuminated by the laser array beam, exhibits different beam pro?les and beam spot radius variations when the number of beamlets, source size, wavelength and the ring radius of the laser array beam are varied. Examining these variations observed in the propagated optical beam and comparing them with the test cases, abnormalities such as cancer and tumor in a biological liver tissue can be diagnosed.
关键词： Optical wave propagation,Tissue turbulence,Effective beam spot radius,Optical intensity,Optical imaging
更新于2025-09-23 15:19:57
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Complex Bianisotropy Effect on the Propagation Constant of a Shielded Multilayered Coplanar Waveguide Using Improved Full Generalized Exponential Matrix Technique
摘要： A theoretical study of the electromagnetic propagation in a complex medium suspended multilayer coplanar waveguide (CPW) is presented. The study is based on the generalized exponential matrix technique (GEMT) combined with Galerkin’s spectral method of moments applied to a CPW printed on a bianisotropic medium. The analytical formulation is based on a Full-GEMT, a method that avoids usual procedures of heavy and tedious mathematical expressions in the development of calculations and uses matrix-based mathematical expressions instead. These particularities are exploited to develop a mathematical model for the characterization of wave propagation in a three-layer shielded suspended CPW structure. This study is based on the development of mathematical formulations in full compact matrix-based expressions resulting in Green’s functions in a matrix form. The implemented method incorporates a new accelerating procedure developed in the GEMT which provides an initial value used to speed up searching for the exact solution in the principal computation code. This helped us to obtain accurate solutions with tolerable computing time. Good agreements have been achieved with the literature in terms of accuracy and rapid convergence. The results for di?erent cases of bianisotropy have been investigated, and particularly, the e?ect on the dispersion characteristics is presented and compared with the isotropic case.
关键词： Muller’s method,dispersion characteristics,chiral,acceleration procedure,complex propagation constant,full-GEMT,multilayer CPW structure,Tellegen
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID) - Miramar Beach, FL, USA (2019.8.19-2019.8.21)] 2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID) - InGaAs/InAsSb Strained Layer Superlattice Infrared Detectors
摘要： Recent telecommunication systems exploit the degrees of freedom of the radio propagation channel more and more. Deeper investigations of system performance require realistic channel models. For this purpose, a new MIMO UWB channel sounder is introduced. The novelty is its capacity to estimate simultaneously direction of arrival and departure in 3D, including polarization state information. The second novelty is a modified SIC algorithm which speeds up the search of the multipath properties of the propagation channel. An extensive measurement campaign is performed in different residential environments and statistical results are provided.
关键词： ultra wideband technology,Channel models,direction of arrival estimation,radio propagation
更新于2025-09-23 15:19:57