- 标题
- 摘要
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- 实验方案
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A compact dual-band bandpass SIW filter using uniplanar combination of the CRLH and resonant type metamaterials
摘要： A new manner of obtaining dual bandpass behaviour in substrate-integrated waveguide (SIW) using a uniplanar combination of composite right/left-handed (CRLH) transmission line and complimentary double split single ring resonator (CDSSRR) is presented and analysed in this paper. The proposed dual band structure has the advantage of miniaturisation due to the presence of both the passbands below the characteristic cuto? frequency of the SIW.A high passband transmission zero overcomes the poor frequency selectivity, and the two resonant frequencies are independently controllable. There are very low insertion losses in both passbands as compared to DGS structures and fabrication simplicity is ensured due to an intact ground. The potential for application of the proposed structure to the design of completely planar miniaturised dual band bandpass metamaterial ?lters has been veri?ed by fabricating a two-stage ?lter based on the proposed combination. The measured results are in good agreement with the simulation results.
关键词： band pass ?lter,complementary split-ring resonators (CSRRs),Metamaterials,Substrate-integrated waveguide (SIW),composite right/left-handed (CRLH),dual-band,miniaturised planar waveguide ?lters
更新于2025-09-10 09:29:36
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Nondestructive testing of advanced materials using sensors with metamaterials
摘要： This work presents a method for nondestructive evaluation (NDE) of advanced materials that makes use of the images in near field and the concentration of flux using the phenomenon of spatial resolution. The method allows the detection of flaws as crack, non-adhesion of coating, degradation or presence delamination stresses correlated with the response of electromagnetic sensor.
关键词： advanced materials,sensors,metamaterials,nondestructive testing
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Kiev (2018.4.24-2018.4.26)] 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Wave Processes in Moderately and Strongly Nonlinear and Active Hyperbolic Metamaterials and Potential Applications
摘要： Two approaches to the moderately and strongly nonlinear active planar hyperbolic metamaterials, with and without an averaging over a unit cell are applied. For the proper sign of the nonlinearity of the layers included into the elementary cell of the metamaterial, the hotspots can be formed in IR range. Hypothetically, the hot spot formation is a rather common feature of the strongly nonlinear media with the interfaces between linear and nonlinear layers. The new evolution equations for the envelope amplitude of the nonlinear wave packets propagating in active hyperbolic media under an arbitrary angle to the optical axis are derived in the parabolic approximation. The mixed derivative in the evolution equation disappears and the equations reduce to the Nonlinear Schrodinger Equation (NSE) form for the waves propagating along an optical axis. The nonlinear quantum optics approach to the waves in hyperbolic active metamaterials is outlined.
关键词： stabilization,active media,nonlinearity,metamaterials,hyperbolic
更新于2025-09-10 09:29:36
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Metamaterials and metasurfaces for designing metadevices: Perfect absorbers and microstrip patch antennas
摘要： In the past twenty years, electromagnetic metamaterials represented by left-handed metamaterials (LHMs) have attracted considerable attention due to the unique properties such as negative refraction, perfect lens, and electromagnetic cloaks. In this paper, we present a comprehensive review of our group’s work on metamaterials and metasurfaces. We present several types of LHMs and chiral metamaterials. As a two-dimensional equivalent of bulk three-dimensional metamaterials, metasurfaces have led to a myriad of devices due to the advantages of lower profile, lower losses, and simpler to fabricate than bulk three-dimensional metamaterials. We demonstrate the novel microwave metadevices based on metamaterials and metasurfaces: perfect absorbers and microwave patch antennas, including novel transmission line antennas, high gain resonant cavity antennas, wide scanning phased array antennas, and circularly polarized antennas.
关键词： microstrip patch antennas,metasurfaces,chiral metamaterials,perfect absorbers,left-handed metamaterials
更新于2025-09-09 09:28:46
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[ASME ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference - Quebec City, Quebec, Canada (Sunday 26 August 2018)] Volume 2A: 44th Design Automation Conference - Design Exploration of Reliably Manufacturable Materials and Structures With Applications to a Microstereolithography System
摘要： One of the challenges in designing for additive manufacturing (AM) is accounting for the differences between as-designed and as-built geometries and material properties. From a designer’s perspective, these differences can lead to degradation of part performance, which is especially difficult to accommodate in small-lot or one-of-a-kind production. In this context, each part is unique, and therefore, extensive iteration is costly. Designers need a means of exploring the design space while simultaneously considering the reliability of additively manufacturing particular candidate designs. In this work, a design exploration approach, based on Bayesian network classifiers (BNC), is extended to incorporate manufacturability explicitly into the design exploration process. The example application is the design of negative stiffness (NS) metamaterials, in which small volume fractions of negative stiffness (NS) inclusions are embedded within a host material. The resulting metamaterial or composite exhibits macroscopic mechanical stiffness and loss properties that exceed those of the base matrix material. The inclusions are fabricated with microstereolithography with features on the scale of tens of microns, but variability is observed in material properties and dimensions from specimen to specimen. In this work, the manufacturing variability of critical features of a NS inclusion fabricated via microstereolithography are characterized experimentally and modelled mathematically. Specifically, the variation in the geometry of the NS inclusions and the Young’s modulus of the photopolymer are measured and modeled by both nonparametric and parametric joint probability distributions. Finally, the quantified manufacturing variability is incorporated into the BNC approach as a manufacturability classifier to identify candidate designs that achieve performance targets reliably, even when manufacturing variability is taken into account.
关键词： negative stiffness metamaterials,Bayesian network classifiers,additive manufacturing,microstereolithography,manufacturing variability
更新于2025-09-09 09:28:46
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Dispersive solitons in optical metamaterials having parabolic form of nonlinearity
摘要： This paper studies solitons in highly dispersive optical metamaterials with cubic–quintic nonlinearity in presence of detuning, inter-moda dispersion, self-steepening and nonlinear dispersion. Three forms of integration scheme retrieved solitons and other solutions to the model that included snoidal and snoidal waves. These algorithms retrieved bright, dark, singular as well as dark-singular combo solitons along with their respective existence criteria.
关键词： Metamaterials,Solitons,Modified extended direct algebraic method
更新于2025-09-09 09:28:46
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Ultra-Narrowband Metamaterial Absorbers for High Spectral Resolution Infrared Spectroscopy
摘要： Metamaterial perfect absorbers (MPAs) are artificial materials composed of an array of subwavelength structures that manipulate electromagnetic waves to achieve extraordinary light absorption properties. Driven by the advent of the Internet of Things, MPAs are employed in microelectromechanical systems for the development of efficient and miniaturized IR detectors, imagers, and spectrometers, thanks to their lithographically tunable peak absorption, spectral selectivity, and ultrathin thickness. MPAs characterized by high absorptance in narrow spectral bands are particularly desirable for the implementation of high-resolution IR spectroscopic sensors. Yet, no accurate analytical model is currently available to guide the design of an MPA with ultra-narrow absorption bandwidth, while meeting all the stringent requirements for spectroscopic sensors. Here, a circuit model capable of accurately predicting spectral responses of metal–insulator–metal (MIM) IR absorbers is reported. The model is experimentally validated in the mid-wavelength IR spectral range and exploited for the first demonstration of an MIM IR absorber that exhibits performance approaching the predicted physical limits: full-width at half-maximum ≈3% and near-unity absorption (η > 99.7%) at 5.83 μm wavelength, while independent of incident angle and polarization of the impinging IR radiation. These unprecedented absorption properties are key enablers for the development of miniaturized, low-cost, and high-resolution spectrometers.
关键词： spectroscopy,microelectromechanical system,plasmonics,infrared absorbers,metamaterials
更新于2025-09-09 09:28:46
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Electromagnetic modeling and design of a novel class of complementary split-ring resonators
摘要： This research study reports the assessment of complementary split ring resonators based on Gielis transformation as basic elements for the design of high-performance microwave components in printed technology. From the electromagnetic simulation of said structures, suitable equivalent circuit models are extracted and analyzed. Physical prototypes are fabricated and tested for design validation. The obtained results confirm that the adoption of supershaped geometries enables the synthesis of very compact scalable microwave filters.
关键词： Gielis formula,equivalent circuit,complementary split-ring resonator,microwave filter,metamaterials
更新于2025-09-09 09:28:46
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Metamaterial-Inspired Vacuum Electron Devices and Accelerators
摘要： Metamaterials (MTMs) are structured materials with subwavelength features that can be engineered to have some unique properties not found in nature, such as negative refractive index, reversed Doppler effect, and reversed Cherenkov radiation. Based on these novel MTMs, several important research groups have made great attempts to develop novel MTM-inspired vacuum electron devices (VEDs) and accelerators. Just as solid-state power devices are innovated by incessant emerging of new semiconductor materials, VEDs can also be inspired by MTMs to have very remarkable advantages, such as smaller size, higher power, higher efficiency, and/or larger gain relative to conventional VEDs, such as traveling-wave tubes, backward-wave oscillators, and klystrons. Similarly, relative to conventional accelerators, MTM-inspired accelerators have obvious advantages, such as smaller size and higher accelerating gradient. Furthermore, MTM-inspired devices have promising applications in areas such as radar, communication, electronic warfare, microwave heating, and imaging.
关键词： high-power microwaves,oscillators,vacuum electron devices (VEDs),electromagnetic metamaterials (MTMs),amplifiers,Accelerators
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 23rd International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD) - Barcelona (2018.9.17-2018.9.19)] 2018 IEEE 23rd International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD) - Towards a Circular Economy via Intelligent Metamaterials
摘要： The present study proposes the use of intelligent metasurfaces in the design of products, as enforcers of circular economy principles. Intelligent metasurfaces can tune their physical properties (electromagnetic, acoustic, mechanical) by receiving software commands. When incorporated within products and spaces they can mitigate the resource waste caused by inefficient, partially optimized designs and security concerns. Thus, circular economy and fast-paced product design become compatible. The study begins by considering electromagnetic metamaterials, and proposes a complete methodology for their deployment. Finally, it is shown that the same principles can be extended to the control of mechanical properties of objects, exemplary enabling the micro-management of vibrations and heat, with unprecedented circular economy potential.
关键词： micro-management,metasurfaces,Circular economy,energy,acoustic,mechanical,material properties,metamaterials,electromagnetic,HyperSurfaces,security
更新于2025-09-09 09:28:46