Article
Engineering, Electrical & Electronic
Kunchen Zhao, Dimitra Psychogiou
Summary: This letter discusses the design and testing of a new type of tunable monolithic microwave integrated circuit (MMIC)-based bandstop filters with quasi-absorptive characteristics. The proposed filters utilize an asynchronous tuning method and GaAs pHEMT varactors to achieve a high stopband attenuation over a wide tuning range. The filter configuration features a high rejection rate (>70 dB) despite using low quality factor lumped element resonators, compact size due to the GaAs MMIC process, and frequency agility. A prototype X-band filter was fabricated using a commercially available GaAs process, demonstrating a tunable center frequency between 8.7 and 10.5 GHz and attenuation up to 73.6 dB.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Dimitra Psychogiou, Kunchen Zhao, Roberto Gomez-Garcia
Summary: This letter discusses the RF design and practical realization of dual-bandstop filters with compact size and two independently controlled rejection bands. The filters are based on miniaturized substrate-integrated-coaxial resonant stages and achieve further miniaturization by tuning the center frequency of the bands. Three prototypes were designed, manufactured, and measured to validate the concept.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Acoustics
Hou Qiao, Zeng He, Wen Jiang, Lin Yang, Weicai Peng
Summary: The study proposes an effective acoustic abatement solution that combines the wideband capability of porous materials and the low-frequency advantage of locally resonant structures. The results indicate that using porous materials and locally resonant designs can effectively achieve sound insulation concerning both the amplitude and tuning bandwidth. This study provides a promising and practical alternative for wideband acoustic modulation.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Computer Science, Information Systems
Young-Ho Cho, Cheolsoo Park, Sang-Won Yun
Summary: This paper presents a 4-pole tunable absorptive bandstop filter using folded coupled-lines with an inductor. By achieving the transfer function of the 4-pole filter, control over the required quality factor is obtained without the need for auxiliary circuits. Experimental results show that the designed filters exhibit high attenuation and reflectionless responses within the tuning range.
Article
Engineering, Electrical & Electronic
G. Challa Ram, P. Sambaiah, S. Yuvaraj, M. V. Kartikeyan
Summary: This paper presents the design and analysis of a spoof surface plasmon polaritons (SSPP)-based bandwidth tunable bandstop filter (BSF) operating at 0.26 THz frequency. The proposed filter is capable of offering tunable bandwidth at THz frequency using a variable capacitor. The experimental results demonstrate the potential use of the proposed terahertz filter as an ultra-compact BSF in future applications of photonic integrated circuits in terahertz imaging.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yiyang Feng, Sudhanshu Tiwari, Sunil A. Bhave, Renyuan Wang
Summary: We have successfully designed, fabricated, and characterized a planar monolithic yttrium iron garnet (YIG) Chebyshev bandstop filter on gadolinium gallium garnet (GGG) substrate with tunable frequency, low insertion loss (IL), and high rejection. This filter is created using YIG micromachining technology that allows direct placement of metal transducers on YIG for strong spin-wave coupling. By applying different bias fields, the stopband center frequency is tuned from 4 to 8 GHz while maintaining more than 30-dB rejection. With proper design of a tunable compact electromagnet, this new filter design can attenuate spurs appearing across the fifth generation (5G) and X-band spectrum.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Kewei Qian, Miao Tian
Summary: This letter presents a new type of miniaturized tunable bandstop filter based on multilayer technology, allowing for a tradeoff between stopband rejection depth and bandwidth to be conveniently realized for different applications. The filter has been designed and fabricated in a low temperature cofired ceramic (LTCC) substrate, occupying a very compact volume.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Review
Chemistry, Physical
Xuchen Nie, Xiaoyue Wu, Yang Wang, Siyuan Ban, Zhihao Lei, Jiabao Yi, Ying Liu, Yanpeng Liu
Summary: Surface acoustic wave (SAW)-matter interaction in two-dimensional (2D) materials can induce and manipulate novel phenomena and functionalities. Experimental reports have been made on various acoustic-induced effects, while some proposed phenomena still await experimental verification. This minireview provides an overview of recent breakthroughs in SAW-induced phenomena and discusses the opportunities and challenges in experiments.
NANOSCALE HORIZONS
(2023)
Article
Optics
Xiumei Dong, Hao Ni, Miaomiao Zhao, Dong Zhong, Dong Zhao, Jun Liu, Xiaoling Chen
Summary: We theoretically investigated wide and tunable bandstop filters based on one-dimensional superconducting photonic multilayers. The wide transmission bandgap of the multilayers can be utilized as a bandstop filter, with the accuracy improved by increasing the sequence number and reducing the semiconductor thickness. The results show that both the bandwidth and center frequency decrease with increasing ambient temperature and semiconductor thickness. Conversely, increasing hydrostatic pressure and superconductor thickness result in monotonous increases in both the bandwidth and center frequency. For thin superconductors or high temperatures close to Tc, the quality factor is high and tunable in a wide range.
OPTICS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Zeng Zhibin, Bai Lei
Summary: A reconfigurable bandstop microstrip line filter with wide continuously adjustable stopband is proposed in this paper. The filter utilizes dumbbell-shaped defected ground structure cells and dual coupling slots to simplify the filter design and improve reconfigurability. An equivalent-circuit model using coupled LC resonators is developed to assist in the understanding of the working principle and design of the filter. Experimental results show good agreement between simulation and measurement, validating the concept of the proposed filter.
IEICE ELECTRONICS EXPRESS
(2021)
Article
Engineering, Electrical & Electronic
Mengdan Kong, Yongle Wu, Zheng Zhuang, Weimin Wang, Cong Wang
Summary: This brief introduces the ultra-miniaturized wideband input-absorptive bandstop filters with one and three transmission zeros using the TFIPD technology. The novel T-shape structure with lumped-element resonators and a chained resistor on the input port is utilized. By loading the SICR on the basic bandstop block, the stopband bandwidth is expanded and frequency selectivity improved. The demonstration of one-zero and three-zero design cases operating at 5 GHz shows successful simulations, manufacturing and measurements.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2021)
Article
Physics, Multidisciplinary
Imane Zegaar, Abdesselam Hocini, Hocine Bensalah, Ahlam Harhouz, Djamel Khedrouche, Mahieddine Lahoubi
Summary: In this study, an ultra-wideband bandstop filter (UWB-BSF) using a plasmonic MIM waveguide coupled with a stub cavity is proposed and investigated. The filter can effectively block optical telecommunication wavelengths of 1550 nm and 1310 nm. By adjusting the length and width of the stub resonator, the transmission peak and resonance wavelength can be tuned. Increasing the number of stub resonators improves the filtering function at a broad bandwidth in the NIR region, with enhanced bandwidth and blue shift in the center wavelength achieved with more stubs. The paper also highlights the significant applications of plasmonic bandstop filters in highly integrated optical circuits.
Article
Mathematics
Li-Jun Du, Wan-Tong Li, Wenxian Shen
Summary: The paper focuses on the propagation phenomena of time-space periodic monotone semiflows and their applications in multi-dimensional media. Abstract theory on spreading speeds and traveling waves is established, with a study on spreading speeds and traveling waves of time-space periodic cooperative systems. The research also applies the obtained results to two-species periodic competition system in multi-dimensional media.
JOURNAL OF FUNCTIONAL ANALYSIS
(2022)
Article
Engineering, Electrical & Electronic
Yijun Weng, Wenjie Feng, Sha Xu, Gaungxu Shen, Yongrong Shi, Wenquan Che
Summary: Two wideband bandstop filters for single and dual-band are proposed, and further extended to reflectionless BSFs based on the analysis from input impedance/admittance perspective. The topologies of higher-number-stopband input-reflectionless BSF are also provided to broaden the design scope. The proposed theory analysis is validated through the construction and measurement of BSFs with corresponding absorptive prototypes.
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Shriman Narayana, Yatendra Kumar Singh
Summary: This article presents a switchable dual-band bandpass to bandstop filter with independently adjustable center frequency and bandwidth.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Article
Mathematics
Xavier Blasco, Gilberto Reynoso-Meza, Enrique A. Sanchez-Perez, Juan Vicente Sanchez-Perez, Natalia Jonard-Perez
Summary: This paper discusses the importance of considering designer preferences in multi-objective optimization problems and proposes a method based on preference basis and dominance basis. By incorporating preferences, geometric properties of the underlying structure of the objective space can be changed to focus solutions on regions of interest for the designer, reducing the number of solutions and facilitating interpretation and analysis of results.
Article
Physics, Multidisciplinary
S. Kuznetsova, J. P. Groby, L. M. Garcia-Raffi, V Romero-Garcia
Summary: The study introduces a procedure to design two-dimensional acoustic structures with desired scattering properties, demonstrating the efficiency by designing stealth acoustic materials with back-scattering suppression and equiluminous acoustic materials with broadband scattering. The scattering properties are validated through single and multiple scattering formalisms, showing excellent agreement.
WAVES IN RANDOM AND COMPLEX MEDIA
(2021)
Article
Chemistry, Multidisciplinary
Eric Ballestero, Brian Hamilton, Noe Jimenez, Vicent Romero-Garcia, Jean-Philippe Groby, Haydar Aygun, Stephen Dance
Summary: The paper presents a framework for simplifying complex structures into surface impedance and applying it to large FDTD computing environments. By reducing the meshing load and computation time of the model, simulations of metamaterials are achieved, and the fitting of RLC parameters from complex impedance data obtained from transfer matrix models is solved.
APPLIED SCIENCES-BASEL
(2021)
Article
Acoustics
Jean Boulvert, Thomas Humbert, Vicente Romero-Garcia, Gwenael Gabard, Edith Roland Fotsing, Annie Ross, Jacky Mardjono, Jean-Philippe Groby
Summary: This article explores the use of asymmetric absorbers made of detuned and folded quarter wavelength resonators to achieve superior sound absorption performance, as demonstrated through experimental testing.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Acoustics
Matthieu Mallejac, Theo Cavalieri, Vicente Romero-Garcia, Aurelien Merkel, Daniel Torrent, Johan Christensen, Jensen Li, Jean-Philippe Groby
Summary: Closed form expressions of effective properties in periodic fluid laminates are derived using Pade approximation of the transfer matrix. Willis coupling is exhibited through second-order Taylor expansion of the transfer matrix elements. The coupling consists of a local term and a nonlocal term, with the nonlocal term arising from the apparent bulk modulus in quasi one-dimensional problems. The nonlocality directly affects the governing equations and involves convolution products in space.
Article
Chemistry, Multidisciplinary
Mara S. Escarti-Guillem, Luis M. Garcia-Raffi, Sergio Hoyas
Summary: This study investigates the aero-acoustic environment during a rocket lift-off. Computational fluid dynamics is used to simulate sound propagation, turbulence simplification, and noise generation, revealing vertical directivity.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Mario Lazaro, Luis M. Garcia-Raffi
Summary: This paper proposes a new methodology for determining the boundaries between oscillatory and non-oscillatory motion in nonviscously damped nonproportional systems. It derives new theoretical results on critical eigenmodes for viscoelastic systems with multiple degrees of freedom and presents a numerical approach to draw the critical curves as solutions of parameter-dependent eigenvalue problems. The method is demonstrated and validated through two numerical examples covering discrete and continuous systems.
APPLIED SCIENCES-BASEL
(2022)
Article
Multidisciplinary Sciences
Sichao Qu, Nan Gao, Alain Tinel, Bruno Morvan, Vicente Romero-Garcia, Jean-Philippe Groby, Ping Sheng
Summary: By using a structured tungsten-polyurethane composite, we have designed and experimentally realized an underwater acoustic absorber with high absorption capability in the frequency range of 4 to 20 kHz, measured in a 5.6 m by 3.6 m water pool. The broadband functionality is achieved through optimizing the distribution of Fabry-Perot resonances.
Article
Physics, Applied
Elie Cheron, Simon Felix, Jean-Philippe Groby, Vincent Pagneux, Vicente Romero-Garcia
Summary: By varying the correlation in SHU materials, we can observe the evolution from disorder to periodic media. The transition from diffusive to transparent medium is clearly observed below the Bragg frequency, while above it, the seemingly bimodal distribution of transmission eigenvalues still characterizes the SHU materials, even when strongly correlated.
APPLIED PHYSICS LETTERS
(2022)
Article
Acoustics
Guillaume Raybaud, Morvan Ouisse, Julien Leng, Adrien Pelat, Jean-Philippe Groby, Vicent Romero-Garcia, Ruben Pico, Francois Gautier
Summary: This study demonstrates analytically and experimentally the perfect absorption of bending waves in beams by thermally tunable subwavelength absorbers. By tuning the temperature and geometry of the blades in the resonating system, the critical coupling conditions can be simultaneously fulfilled, leading to the perfect absorption of the incident waves in the reflection problem.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Multidisciplinary Sciences
Yang Meng, Vicente Romero-Garcia, Gwenael Gabard, Jean-Philippe Groby, Charlie Bricault, Sebastien Goude, Ping Sheng
Summary: In this study, sum rules for unidimensional scattering problems were derived using Herglotz function theory, providing important guidance for the design of passive absorbers and mufflers.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Yang Meng, Vicente Romero-Garcia, Gwenael Gabard, Jean-Philippe Groby, Charlie Bricault, Sebastien Goude
Summary: Passive metamaterials provide efficient solutions for sound absorption in the low-frequency regime with deep subwavelength dimensions. They have been extensively applied in unidimensional reciprocal problems considering that an incident wave is either reflected or transmitted at the outlet boundary. This work presents a general design methodology of metamaterial absorbers for open-duct problems, which is a special case of impedance outlet boundary encountered in practical applications. Experimental validation is provided for maximum or perfect absorption, either at single frequencies or over specific frequency bands.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Physics, Applied
Theo Cavalieri, Vicent Romero-Garcia, Manuel Melon, Jean-Philippe Groby, Jean-Christophe Chamard
Summary: In this study, a metamaterial-based acoustic lens is proposed to steer and focus acoustic sources using slits loaded with periodic Helmholtz resonators. A fully explicit two-dimensional predictive model is developed, considering thermoviscous losses, interslit evanescent coupling, and high-order modes. The results show excellent agreement with the finite-element method, both in the near field and in the far field over a wide frequency range.
PHYSICAL REVIEW APPLIED
(2023)
Article
Acoustics
N. Aberkane-Gauthier, V. Romero-Garcia, D. Lecoq, M. Moleron, C. Lagarrigue, C. Pezerat
Summary: The dispersion and scattering properties of a soft solid plate with solid cylindrical inclusions embedded in it are investigated theoretically and numerically in this study. The system takes into account both the vibroacoustic coupling and the presence of viscoelastic losses. The presence of the inclusions introduces resonant and antiresonant phenomena, leading to an elastic band-gap and destructive modal interference in the soft solid plate.
JOURNAL OF SOUND AND VIBRATION
(2024)
Review
Materials Science, Multidisciplinary
Elie Cheron, Jean-Philippe Groby, Vincent Pagneux, Simon Felix, Vicent Romero-Garcia
Summary: This study experimentally characterizes the wave transport properties of two-dimensional stealthy hyperuniform distributions of rigid scatterers in a waveguide for scalar waves in airborne audible acoustics. It directly links these properties to the geometric distribution of points through the structure factor. The study identifies different scattering regimes, such as transparent regions, isotropic band gaps, and anisotropic scattering, depending on the stealthiness of the hyperuniform point pattern.
