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About 10,000 papers for “Waveguide”

WAVEGUIDE

Douglas J. Button, Alexander V. Salvatti · The Journal of the Acoustical Society of America · 2012

Cited by 0

waveguide

Gan Zhou, Tao Wang, Yikai Su · 2016

Cited by 0

waveguide

F. Setzpf, R. Schiek, R. Ricken et al. · 2012

Cited by 0

A Waveguide to Unenclosed Coplanar Waveguide Transition

Theodore Reck, Robert M. Weikle, N. Scott Barker · IEEE Transactions on Microwave Theory and Techniques · 2010

A transition from rectangular waveguide to unenclosed coplanar waveguide (CPW) is designed and tested at <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W</i> -band. Full-wave finite-element analysis is applied to the design and optimization trends are shown for the critical parameters. A stepped-impedance filter suppresses a parasitic mode, which is generated as the circuit emerges from the waveguide block, and a rejection of -20 dB is achieved. A back-to-back structure is used to characterize the performance of the transition and an insertion loss of 1.6 dB from 75 to 100 GHz is measured. Removing line losses, a single transition insertion loss of 0.46 dB is obtained.

Cited by 12

Waveguide amplifier and waveguide amplifier fabrication method

Kippenberg, Tobias, Liu, Yang, Qiu, Zheru et al. · Infoscience (Ecole Polytechnique Fédérale de Lausanne) · 2023

The present invention concerns a waveguide amplifier comprising: - at least one embedding cladding material or layer, and - at least one rare-earth ion implanted silicon nitride material or layer embedded in the at least one embedding cladding material or layer, the at least one rare-earth ion implanted silicon nitride material or layer defining a waveguide core enclosed by the at least one embedding cladding material or layer.

Cited by 0Open access

Coaxial waveguide to circular cylindrical waveguide junction

Alan Sangster, D.J. McIntosh · IEE Proceedings H Microwaves Antennas and Propagation · 1985

The abrupt junction between a coaxial waveguide with hollow inner and a cylindrical waveguide has previously been analysed using a moment method for the case where the hollow inner has an infinitesimally thin wall. The paper describes modifications which permit a wall of finite thickness to be accommodated.

Cited by 2

The waveguide invariant for a Pekeris waveguide

Heechun Song, Gihoon Byun · The Journal of the Acoustical Society of America · 2021

A closed-form waveguide invariant β for a Pekeris waveguide is derived. It is based on the modal Wentzel–Kramers–Brillouin (WKB) dispersion equation and implicit differentiation, in conjunction with the concept of the angle-dependent “effective boundary depth,'' ΔH(θ). First, an explicit expression for β(m,n) between mode pairs is derived assuming an ideal waveguide of the effective waveguide depth H+ΔH(θ), which provides an excellent agreement with the exact value calculated for the Pekeris waveguide of depth H using KRAKEN. Then, a closed-form expression for a group of adjacent modes is derived: β = (H + ΔH)/(H/cos2θ − ΔH), which reduces to β = cos2θ as ΔH/H ≪ 1, the analytical expression for an ideal waveguide. For applications to source-range estimation, the waveguide invariant β is used to derive the theoretical beam-time migration (i.e., dispersion curve) in a Pekeris waveguide.

Cited by 0

Terahertz Topological Waveguide and Waveguide based Grating

Khan, Muhammad Talal Ali · UNSWorks (University of New South Wales, Sydney, Australia) · 2023

The upcoming sixth-generation (6G) communication which could emerge as an intelligent platform, is expected to deliver ubiquitous wireless technology. The use of the terahertz (THz) region of the spectrum has the potential to support high data rates (over 100 Gbit/s) and wider bandwidth enabling future 6G wireless technologies and the internet of things. Nevertheless, the THz frequencies have a set of technical challenges including the adequate high power from THz sources and the lack of integrated THz systems with high bandwidth and low cost. The latter can be enabled by a compact planar platform through integrated waveguides and functional components with low loss and low dispersion. Several planar THz waveguides have been proposed for routing THz waves including promising solutions such as metallic parallel-plate waveguides, dielectric two-dimensional photonic crystal waveguides, and hybrid photonic crystal waveguides. Due to THz waveguide interconnection with different components in an integrated THz system, flexibility is required to have the waveguides with bends. However, these current THz waveguides show a lack of robustness and high loss against sharp bends arising from reflection. This results in a narrow transmission bandwidth in the waveguide and waveguides with functional components, i.e., bends, intersections, and junctions. The recent realization of quantum spin Hall photonic topological insulator rises as an avenue to enable robust propagation insensitive to structural impurities and sharp bends through a topological waveguiding solution. Prior topological waveguides are mainly reported either on the microwave or optical frequencies. While we initiate working for topological waveguides in the THz region, since then, a few reports have appeared mostly all-silicon-based topological waveguides. However, these reports present relatively narrow topological single-mode bandwidth due to the high refractive index of silicon. In addition, the need for access to clean rooms and photolithography machines makes the fabrication process expensive. This thesis is structured into two parts: development of THz waveguide and waveguide-based device towards THz integrated system. In the context of a waveguide, this thesis reports low-cost and broad-bandwidth air channel topological integrated waveguide in the THz region which is considered a new field of application stemming from the recent breakthrough in photonic topological insulators. The topological waveguide, composed of hexagonally arranged photonic crystal metallic pillars confined between two metallic parallel plates offers broader relative topological bandwidth beating the previously reported silicon-based THz topologically guided bandwidth with a 60% increase in terms of the actual frequency range. The topological waveguide is fabricated with low-cost 3D printing and a gold sputtering method, for the first time, to the best of our knowledge. The waveguide supports single-mode, linear dispersion, and topological robustness, confirming the low-loss transmission through sharp corners and defects in the measurements. Another crucial point for realizing an integrated THz system is the development of waveguide-based functional devices. The waveguide devices provide the advantage of manipulating THz waves effectively and increase stability compared to free-space isolated optical components. In this development, various waveguide devices are still in demand such as the THz filter, an essential signal-processing device. To realize a passive filter, a common approach is to exploit Bragg grating, a fundamental component, which has been widely demonstrated in the optical range due to low loss silica but less explored in THz due to high absorption losses of polymers. In the context of the waveguide-based device, this thesis reports dual-frequency filtering and dispersion compensating THz waveguide subwavelength grating. The grating is realized using a subwavelength birefringent dielectric core in a cross-section where the periodicity is introduced along the propagation direction. The fabrication of subwavelength waveguide grating is performed using micromachining techniques in a low-loss polymer material, cyclic olefin copolymer. The waveguide grating demonstrates filtering of two orthogonally polarized modes (x- and y- polarizations) with average 8-dB extinction ratios and 5-GHz 3-dB bandwidth for both polarizations. Due to strong index modulation in a subwavelength grating, a large negative group velocity dispersion of -188/ps/mm/THz is achieved which confirms a 7.5 times increase in comparison to the state-of-the-art reported until now in the THz range. In addition, this dispersion is reported in a very compact length of 43 mm which is less than half of the length reported to date, to the best of our knowledge. This thesis shines a light on the development of future integrated THz systems. This is realized by examining the possibility of exploiting a robust waveguide for the short-range broadband THz wireless communication and compact polarization maintaining waveguide-based grating for the THz long-haul wireless/fiber-based links, respectively.

Cited by 0Open access

Waveguide, Waveguide Circuits and Antenna Research Study

Elmer H. Scheibe · 1969

Abstract : Part I of the report describes the general study made of beam waveguide resonators at millimeter wavelengths. An important result of this study was the derivation of the equivalent circuits for resonators with input and output coupling. An extensive bibliography on guided electromagnetic wave beams, beam waveguides, beam waveguide antennas, beam waveguide resonators, and Fabry-Perot resonators is included in Part I of this report. Part 2 describes a new type of waveguide filter called a cut-off coupled microwave filter. The theory, design and fabrication of these filters as well as the measurements made on them is described in some detail. Part 3 deals with two general applications of the beam waveguide of rectangular symmentry. One of the studies was concerned with the rectangular beam waveguide resonator and the other with a rectangular beam waveguide antenna formed from the resonator.

Cited by 0

Waveguide gyro

Bohua Sun · 2010

The most accuracy solid state gyroscopes are the gyro based on Sagnac principal of light. Unfortunately, the gyro can not be miniaturized due to the needs of long light-path to increase the phase difference. The problem of this obstacle is that the speed of light is too fast and the phase change due to the light speed is too small to be detected. It is strongly needs a solution to increase the phase change by decreasing the light speed! For that purpose, the atomic wave gyro had been proposed based on the freeze atom technology, which will reduce the speed of light according to the quantum mechanics principle, it does works but the extra large equipment will be needed, and no way to make the atom wave gyro in MEMS scale. This paper is formulating a waveguide gyro based on the author's previous work. From the theoretical formulation, the wave guide gyro is 1000 times accuracy and sensitive than Sagnac gyro at the situation of having same length of waveguide.

Cited by 0

Waveguide Components

D. Budimir · Encyclopedia of RF and Microwave Engineering · 2024

Abstract Waveguide components such as waveguides as transmission lines, mode transducers, terminations, discontinuities, attenuators, phase shifters, multiport junctions, directional couplers, filters, diplexers, and multiplexers are extensively employed in industry to produce waveguide subsystems for a wide variety of microwave and millimeter wave applications. Waveguide components, in general, are constructed from elements of the transmission structures and it is essential to understand the electromagnetics of the situation. This chapter attempts to illustrate the basic considerations by referring to a few of the more important rectangular waveguide components employed in microwave and millimeter wave systems. It is hoped that the references included at the end of this chapter will direct the interested reader to sources of more detailed information on particular subjects.

Cited by 0

Waveguide Handbook

N. Marcuvitz · Andalas University Repository (Andalas University) · 1951

Cited by 0

Illumination waveguide

Lim, Jui Sheng · DR-NTU (Nanyang Technological University) · 2020

There are many commercial bars around the world for lighting. Most of them are capable of doing the basic effect of lighting. As technology has evolved through the years, the design and development of lighting bars have advanced as well. These novel designs aim to be more efficient in terms of coast, and longer life cycles while providing better illumination quality. &#13;\nUsually, optical waveguides serve as a light pipe for guiding light along the waveguide. Nevertheless, if the waveguide is designed to retain a light, the waveguide can be converted into a light illuminating bar for decorative lighting applications. This project aims to create such lighting bars using LED and resin. Making a light bar and explore design/manufacturing parameters to change the characteristics of the illumination. The project mainly involves hands-on-tests at the photonics lab.&#13;\nTo enhance the understanding of this study, it will begin with a brief description of the context of the project and the issues faced with the conventional lighting bar. It will then focus on the ideas of the primary assignment, which is the design and manufacture from scratch of a silicone tube. Next, the secondary task would be to strengthen the tube so that maximum illumination will occur. Separately, several tests were performed out of the area to figure out how to effectively maximize the silicone bar. Finally, this report would detail the developmental processes for this project, as well as the key takeaways and learning outcomes.

Cited by 0

Waveguide Handbook

Marcuvitz, N. · TU Digital Collections (Thammasat University) · 1986

The Waveguide Handbook is an unbridged reprint of the book first published in 1951 by McGrawHill as volume 10 of the MIT Radiation Laboratory Series. Although the primary aim of the book is to present the equivalent circuit parameters for a large amount of microwave structures, a brief but coherent account of the fundamental concepts necessary for their proper utilisation is included.

Cited by 0

Ultrasound waveguide

Watson, Malcolm John, Corner, George A., Kirk, Katherine J. et al. · ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam) · 2005

An ultrasound waveguide that is attachable to an ultrasound probe so as to identify a target area on a target object. The ultrasound waveguide has an ultrasound transducer coupling means that allows an ultrasound signal to be transmitted through a guide means. The ultrasound waveguide also has a positioning means for positioning the guide means in relation to the target area on the target object. The guide means is provided with a channel that provides a discontinuity within the guide means that causes a discontinuity in the ultrasound signal emitted by the probe. The presence of this discontinuity allow for proper alignment of the ultrasound waveguide with the target object.

Cited by 0

waveguide arrays

Rodrigo A. Vicencio, Mario I. Molina, Yuri S. Kivshar · 2003

Cited by 0