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Voltage-tunable dual-layer terahertz metamaterials

Microsystems & Nanoengineering 2016年第1期2卷 173-180页

作者： Xiaoguang Zhao Kebin Fan Jingdi Zhang George R.Keiser Guangwu Duan Richard D.Averitt Xin Zhang Department of Mechanical Engineering Boston UniversityBostonMA 02215USA Department of Physics University of CaliforniaSan DiegoLa JollaCA 92093USA Department of Physics Boston UniversityBostonMA 02215USA Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA School of Engineering Brown UniversityProvidenceRI 02912USA

This paper presents the design,fabrication,and characterization of a real-time voltage-tunable terahertz metamaterial based on microelectromechanical systems and broadside-coupled split-ring *** our metamaterial,the magnetic and electric interactions between the coupled resonators are modulated by a comb-drive actuator,which provides continuous lateral shifting between the coupled resonators by up to 20μ*** these strongly coupled split-ring resonators,both a symmetric mode and an anti-symmetric mode are *** increasing lateral shift,the electromagnetic interactions between the split-ring resonators weaken,resulting in frequency shifting of the resonant *** the entire lateral shift range,the symmetric mode blueshifts by~60 GHz,and the anti-symmetric mode redshifts by~50 *** amplitude of the transmission at 1.03 THz is modulated by 74%;moreover,a 180°phase shift is achieved at 1.08 *** tunable metamaterial device has myriad potential applications,including terahertz spatial light modulation,phase modulation,and chemical ***,the scheme that we have implemented can be scaled to operate at other frequencies,thereby enabling a wide range of distinct applications.

关键词： broadside-coupled split-ring resonators(BC-SSRs) comb-drive actuator microelectromechanical systems(MEMS) tunable metamaterials

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Left-Handed Characteristics tunable C-Shaped Varactor Loaded Textile Metamaterial for Microwave Applications

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Computers, Materials & Continua 2022年第4期71卷 611-628页

作者： Samir Salem Al-Bawri Mohammad Tariqul Islam Kabir Hossain Thennarasan Sabapathy Muzammil Jusoh Space Science Centre Climate Change InstituteUniversiti Kebangsaan MalaysiaBangi43600Malaysia Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaUKMBangi43600SelangorMalaysia Advanced Communication Engineering(ACE) Centre of ExcellenceUniversiti Malaysia Perlis(UniMAP)PerlisMalaysia Faculty of Electronic Engineering Technology Universiti Malaysia Perlis(UniMAP)PerlisMalaysia

This paper presents a textile-based C-shaped split-ring resonators(SRR)metamaterial(MTM)unit cells with an electrical tunability *** proposed MTM was composed of two symmetrical C-shaped SRR combined with a central diagonal metal bar,whereas the RF varactor diode is placed on the backside of the splitted ground *** behavior of single and array MTM unit cells were analyzed while the achieved negative index physical characteristics were widely *** four different MTM arrays(i.e.,1×1,1×2,2×1,and 2×2)were analyzed in simulation,a 2×2-unit cell array was chosen to fabricate,and it was further undergone experimental *** proposed tunable MTM exhibits double negative(DNG)/left-handed properties with an average bandwidth of more than 2.8 ***,attainable negative permittivity and negative permeability are within 2.66 to 9.59 GHz and within 2.77 to 15 GHz,respectively,at the frequency of interest(between 1 and 15 GHz).Moreover,the proposed tunable MTM also showed tunable transmission coefficient *** proposed electrically tunable textile MTM might function in a dynamic mode,making it suitable for a variety of microwave-wearable applications.A satisfactory agreement between simulations and experiments were achieved,demonstrating that the proposed MTM can operate over a wide bandwidth.

关键词： Textile metamaterial metamaterial wearable antennas tunable metamaterials metasurface antennas DNG metamaterials

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