Article
Mechanics
Cang He, Kian Meng Lim, Xiao Liang, Fang Zhang, Jinhui Jiang
Summary: This study introduces a mechanism for manipulating band structures by adjusting string tensions, allowing for the simultaneous shifting of Bragg and local resonance band gaps, as well as achieving ultra-wide band gaps and narrow band filters.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Optics
Pei-Jung Wu, Wei-Cheng Tsai, Chan-Shan Yang
Summary: In this study, an electrically tunable multi-band terahertz (THz) metamaterial filter based on graphene and multiple-square-loop structures was designed. The structure consists of multiple metal square loops of different sizes, which correspond to different THz frequencies, achieving the expected efficacy of a multi-band wave filter. By sweeping external voltages, the capability of the high-sensitivity THz filter can be modulated from single-band to multi-band filtering by changing graphene's Fermi levels. This hybrid THz wave filter study shows promise for the development of selecting channels in THz and 6G communications.
Article
Chemistry, Multidisciplinary
Yusheng Zhang, Peng Lin, Yu-Sheng Lin
Summary: Four designs of tunable split-disk metamaterial absorbents were proposed, showing different absorption resonances and high sensitivity. This study provides possibilities for the application of optical gas sensors and biosensors with high sensitivity.
Article
Materials Science, Multidisciplinary
Sare Nur Cuhadar, Habibe Durmaz
Summary: In this article, a metamaterial multi-band perfect absorber with a Pi-inverted-Pi resonator is designed and analyzed. The results show that this structure exhibits nearly perfect absorption in five narrow bands. The tunability of the resonator and the origin of these resonance bands are investigated. Additionally, the polarization dependence of the structure is examined, and it is found to be partially polarization-dependent, which is beneficial for optical filtering. Compared to similar absorbers in the literature, the proposed system offers narrow bands with high Q-factors at each resonance wavelength.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Tao Xu, Xiaocan Xu, Yu-Sheng Lin
Summary: The design of electric split-ring metamaterial (eSRM) with tunable terahertz free spectra range (FSR) characteristic allows stable operation in both TE and TM modes, with the ability to tune and switch electromagnetic responses between dual- and quad-resonance. The eSRM demonstrates sensitivity to polarization angle and can be used for sensing applications exposed to different surrounding refraction index, with a sensitivity of 0.457 THz/RIU and average Q-factor and FOM values of 40.65 and 35.47, respectively.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2021)
Article
Crystallography
Bukola Ajewole, Pradeep Kumar, Thomas Afullo
Summary: This paper presents a novel I-shaped metamaterial using split-ring resonators for multi-band wireless communication. The proposed design is optimized through parametric analysis and simulation using CST and MATLAB. The ISMeTM unit cell and arrays are designed and analyzed, with emphasis on the resonance and interaction between the split ring and electric/magnetic fields. The results confirm the multi-band operation of the proposed design.
Article
Mathematics
Nagandla Prasad, Pokkunuri Pardhasaradhi, Boddapati Taraka Phani Madhav, Sudipta Das, Wahaj Abbas Awan, Niamat Hussain
Summary: In order to meet the demand for modern communication technology, the development of satellite communications has been consistently investigated. In this article, a rectangle-type SRR is attached to circular-type SRR to obtain two frequencies in the X-band operation. The designed structure exhibits negative metamaterial properties and is fabricated on a polyimide dielectric material with specific dimensions. Simulation results show that the proposed design resonates at two X-band frequencies, which are validated by measurement results with minor frequency differences. Thus, the recommended design is very useful for X-band applications.
Article
Engineering, Electrical & Electronic
Fatemeh Kazemi
Summary: This paper presents a high gain array antenna consisting of 16 SRR elements, suitable for wireless communication systems with high sensitivity and matching. Circular polarization can be obtained by utilizing ring structures, and the overall size is small and simple, with acceptable agreement between simulation and experimental results.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2021)
Article
Optics
Xiaocan Xu, Ruijia Xu, Yu-Sheng Lin
Summary: The research proposes a design of tunable double split-ring metamaterial in the terahertz frequency range, demonstrating switchable characteristics between single-resonance and dual-resonance with polarization sensitivity, within the frequency range of 0.16 THz to 0.21 THz. Tunability and stability of DSRM can be achieved by changing the gap between two SRRs or the distance between face-to-face SRRs.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Jinlai Liu, Bingyi Liu, Shuai Tang, Jie Song, Yongyuan Jiang
Summary: This paper presents a tunable dual-band perfect metamaterial absorber in the infrared band, which can adjust the absorptivity of absorption peaks by varying the refractive index of the liquid crystal layer, showing excellent performance and promising applications.
Article
Acoustics
Hongye Ma, Ke Wang, Haifeng Zhao, Chong Zhao, Jing Xue, Chao Liang, Bo Yan
Summary: This paper proposes a tunable local resonance metamaterial with chiral buckling structures for low-frequency vibration isolation. The unit cell consists of the inner and outer buckling stiffness structure, basic structure, and local resonator. The bistability of the unit cells with different initial shapes of beams is investigated and compared. The dynamic responses of the metamaterial with simple unit cells and hybrid supercells are derived and analyzed. The results show that the unit cell with initially convex downward beams has strong bistability and determinate deformation modes. The metamaterial with simple unit cells has tunable and wide band gap and low-frequency vibration isolation. The metamaterial with hybrid supercells can further broaden the band gap width and lower the band gap frequency, which has up to 16 different band gap characteristics.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Electrical & Electronic
C. H. Joseph, Davide Mencarelli, Luca Pierantoni, Paola Russo, Leonardo Zappelli
Summary: In this work, a simple and efficient circuit modeling approach is proposed to accurately describe metamaterial structures over a wide bandwidth. The equivalent circuit model is obtained by identifying the load as shunt branches with reactive elements, which can be positive or negative. The model is validated using the split-ring resonator structure and allows for easy conversion of negative elements to positive reactive elements. Unlike T or Pi circuit models, this approach can directly construct circuit models from scattering parameters and is valid for any circuit topologies.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Materials Science, Multidisciplinary
Md Bellal Hossain, Mohammad Rashed Iqbal Faruque, Ahmed S. Alshammari, Mohammad Tariqul Islam
Summary: This paper presents a wide bandwidth enriched metamaterial for satellite and Wi-Fi applications. The metamaterial has triple band negative permittivity and refractive index, as well as near zero permeability, and covers C and X bands. The analysis and validation of the designed unit cell structure show the excellent effective parameters and performance of the proposed design.
RESULTS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Md Bellal Hossain, Mohammad Rashed Iqbal Faruque, Mohammad Tariqul Islam, Mandeep Singh, Muzammil Jusoh
Summary: This paper presents a double E-shaped symmetric split ring resonators metamaterial absorber for EMI shielding and stealth applications in C and X band. The simulated results show three absorption peaks at 5.376, 10.32 and 12.25 GHz with absorption rates of 99.9%, 99.9% and 99.7%, respectively. The absorber unit cell structure exhibits nearly perfect absorptions over a wide angle of incidences.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Crystallography
Md Salah Uddin Afsar, Mohammad Rashed Iqbal Faruque, Mayeen Uddin Khandaker, Amal Alqahtani, David A. Bradley
Summary: This study presents a double-inverse-epsilon-shaped, triple-band epsilon-negative metamaterial with two split ring resonators. The proposed metamaterial shows three resonance peaks and negative permittivity at different frequencies. The simulated results are authenticated, and parametric analyses and optimization were conducted.
Article
Physics, Multidisciplinary
M. Hostut, T. Tansel, A. Kilic, T. Akin, Y. Ergun
Article
Engineering, Electrical & Electronic
Ilker Comart, Cagri Cetintepe, Ebru Sagiroglu, Simsek Demir, Tayfun Akin
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2019)
Article
Engineering, Electrical & Electronic
M. Yusuf Tanrikulu, Cigdem Yildizak, Ali K. Okyay, Orhan Akar, Adem Sarac, Tayfun Akin
IEEE SENSORS JOURNAL
(2020)
Editorial Material
Physics, Applied
Nezihe Karacan, Evren Ekmekci, Gonul Turhan-Sayan
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Engineering, Electrical & Electronic
Nezihe Karacan, Evren Ekmekci
SENSORS AND ACTUATORS A-PHYSICAL
(2020)
Article
Engineering, Electrical & Electronic
Oguzhan Temel, Yunus Eren Kalay, Tayfun Akin
Summary: A novel SLID bonding process has been developed for wafer-level MEMS packaging using thin layers of Au-Sn materials. This process provides good bonding strength and reliability through the use of metallic bonds with a high re-melting temperature. The vacuum level inside the package is well maintained even after post-processes such as annealing and dicing.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2021)
Article
Physics, Applied
Kazim Akel, Mustafa Hostut, Tayfun Akin, Yuksel Ergun
Summary: Interband optical absorption in InAs/GaSb based type-II superlattice structures was calculated using the empirical pseudopotential method (EPM), which showed a slight underestimation in bandgap wavelengths. This method is suitable for heterostructures with ternary and quaternary alloys.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Bahar Atik, Emrah Dirican, Oytun Demirors, Hakan Altan, Okan Esenturk, Mustafa Yildirim, Tayfun Akin
Summary: This study demonstrates that W-doping introduces new phases and supports the formation of new V-phases. The new V-phase, V2O5, dominates the overall electrical properties. Terahertz Time-Domain Spectroscopy (THz-TDS) is used as a nondestructive characterization technique to monitor the effects of doping on the electrical behavior of VxOy films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Computer Science, Artificial Intelligence
Umut Kose, Evren Ekmekci
Summary: In this study, the effects of dielectric substrate thickness and dielectric loss tangent on the absorption spectrum in S-band were investigated. Two different absorber topologies, namely closed ring resonator (CRR) and split ring resonator (SRR), were studied to observe the effects on LC- and dipole-type resonances. Numerical and experimental studies were conducted on the substrate thickness, while numerical studies were conducted on the dielectric loss tangent. The results showed that the substrate thickness significantly affected the resonant frequency and absorption peak level due to the impedance matching phenomenon. The frequency shift behavior in response to substrate thickness change depended on the coupling between the resonator structure and the metallic ground plane. Furthermore, the responses of absorption spectra to changes in substrate thickness and dielectric loss were similar for LC and dipole-type resonances. Overall, this comprehensive and systematic parametric analysis has made an important contribution to the literature, particularly in the field of microwave experimental studies.
TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES
(2023)
Article
Engineering, Electrical & Electronic
Hasan Cetin, Evren Ekmekci
Summary: This study presents the tunability of the electromagnetically induced transparency (EIT)-like transmission window using low-volume dielectric loadings in the S-band. A metamaterial made up of an electric resonator and a closed-ring resonator patterned on a dielectric substrate is used to achieve the EIT-like transmission behavior. The frequency tuning is achieved through horizontal and vertical sliding applications of the low-volume loadings. The results show that the proposed sliding applications are effective in tuning the transmission peak frequency.
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES
(2023)
Article
Computer Science, Artificial Intelligence
Nezihe Karacan, Neslihan Kader Bulut, Evren Ekmekci
Summary: This study investigates the effects of the position and gap orientation of the SRR structure as a superstrate on transmission characteristics, revealing significant impacts on amplitude and resonance frequency in S-21. Parametric studies on substrate thickness and dielectric constants also show effects on amplitude and resonance frequency. Transmission, reflection, and power distribution plots are analyzed to reveal the power distribution mechanism.
TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES
(2022)
Article
Engineering, Electrical & Electronic
Mustafa Mert Torunbalci, Hasan Dogan Gavcar, Ferhat Yesil, Said Emre Alper, Tayfun Akin
Summary: The paper introduces a novel and simple all-silicon wafer-level fabrication and hermetic packaging method for MEMS devices. The method achieves hermetic sealing and signal transfer without complex process steps, with a low package vacuum and high bonding strength. MEMS resonators fabricated and packaged using this method show significant enhancements in bias instability and temperature sensitivity compared to traditional technologies.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Elif M. Kucukoner, Alparslan Cinar, Umut Kose, Evren Ekmekci
Summary: This study investigates the effects of using different DGS on rectangular microstrip antennas, finding that the CSRR-D structure can achieve a larger electrical size reduction ratio. Experimental results verify the electrical size reduction ratios of the two DGS.
ADVANCED ELECTROMAGNETICS
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Firat Tankut, Mustafa H. Cologlu, Hande Ozturk, Gorkem Cilbir, Orhan S. Akar, Tayfun Akin
INFRARED TECHNOLOGY AND APPLICATIONS XLV
(2019)
Article
Multidisciplinary Sciences
Ramazan Cetin, Tayfun Akin
SCIENTIFIC REPORTS
(2019)