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- 摘要
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- 实验方案
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SUBSTRATE INTEGRATED WAVEGUIDE CIRCULAR ANTENNA FOR TERAHERTZ APPLICATION
摘要： This paper presents a multi-band annular ring antenna that is obtained from a single-layer probe-fed substrate integrated waveguide based on a graphene material, with three top plan slits. In order to create a multi-bands antenna, we conduct simulation of the antenna structure based on CST/HFSS, so we use parametric tuning to adjust TM modes. Simulations show a good results between the two methods (finite element method and integral method) CST and HFSS Simulators. The bandwidths for three modes are 340 GHz in first mode, 346 GHz in the second mode, and 104 GHz in the third mode. The simulation gains at T M11, T M02, and T M12 are 8.2 dB, 8 dB, and 11 dB, respectively. The proposed antenna can be used in therahertz applications.
关键词： graphene material,terahertz applications,multi-band annular ring antenna,substrate integrated waveguide
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE/MTT-S International Microwave Symposium - IMS 2019 - Boston, MA, USA (2019.6.2-2019.6.7)] 2019 IEEE MTT-S International Microwave Symposium (IMS) - Triple-Band Near-Field Wireless Power Transfer System Using Coupled Defected Ground Structure Band Stop Filters
摘要： For the first time, a triple-band near-field wireless power transfer (WPT) system is presented using coupled triple-band defected ground structure (DGS) bandstop filters (BSF). A triple-band DGS-BSF is possible through creating a frequency dependent effective lower inductance at higher frequencies. When we couple two triple-band DGS-BSFs in a back-to-back configuration, a triple-band DGS-WPT system is created. We verify the proposed DGS-WPT system through good agreements between electromagnetic simulations and measurements. The measured WPT efficiencies are 68%, 60%, and 65% at 100.8 MHz, 140.7 MHz, and 182.2 MHz, respectively at a WPT separation distance of 30 mm. Each of the WPT transmitter and receiver has a size of 50 × 50 mm2.
关键词： defected ground structures,wireless power transmission,mutual coupling,multi-band
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Multi-Band Optical Systems to Enable Ultra-High Speed Transmissions
摘要： Current forecasts indicate that the fastest growing IP-traf?c is in metro and data center interconnect (DCI) [1]. The exploitation of the entire low-loss spectrum of single-mode ?bers (SMF) (from 1260 nm up to 1620 nm) was proposed to avoid the predictable capacity crunch and the eventual need for a new ?bre infrastructure roll-out. First analytic result considering multi-band (MB) transmission (from O- to L-band) hint an achievable traf?c load exceeding 200 Tb/s for a 500 km link in a single SMF [2]. The maximum transmittable capacity over ITU-T G.652D SMF, which is the mainly deployed ?ber type [3], is evaluated in this work. Three different ?ber span lengths are considered: 40 km, 60 km and 80 km. A high level overview of the MB setup is depicted in Fig. 1 (left). The system is composed of a MB transmission bench composed of {L, C, S, E, O}-band transmitters. 50 GHz spaced polarization multiplexed (PM)-MQAM signals with root raised cosine shaping (roll-off = 0.15) and a symbol rate of 32 Gbaud are multiplexed and launched into the ?ber link. A 2 nm guard-band between adjacent bands is assumed. At the receiver side, the bands are de-multiplexed, ampli?ed and then demodulated. We assume lumped ampli?ers: Praseodymium doped ?bre ampli?er(DFA) in O-band [4], Bismuth DFA in E-band [5], Thulium DFA in S-band [6] and Erbium DFA in C- and L-bands. A noise ?gure of 6, 5.5, 7, 6 and 7 dB are assumed for {L, C, S, E, O}-band ampli?ers, respectively. The wavelength ranges and number of channels in each band are reported in Table 1. The local-optimization global-optimization (LOGO) approach [7] is employed to optimize the launched power. The overall signal-to-noise-ratio (SNR) is estimated considering the impact of non-linear interference (NLI) which is evaluated using the generalized Gaussian noise (GGN) model [8]. The GGN model takes into account the frequency dependence of the ?ber loss, the chromatic dispersion and the stimulated Raman scattering (SRS). Finally, the achievable capacity assuming a ?exible transceiver capable to completely exploit the available SNR is computed.
关键词： ultra-high speed transmissions,ITU-T G.652D SMF,capacity crunch,single-mode fibers,multi-band optical systems
更新于2025-09-11 14:15:04
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A Multiband Transparent Transponder Based on Reconfigurable Optical Frequency Combs for Cross Connection of Intersatellite and Satellite Ground
摘要： In this paper, a parallel multiband frequency-conversion scheme for satellite applications based on a single optical frequency comb is proposed, and a recon?gurable satellite transponder is designed for future multiband broadband satellites. In addition, we establish a test system of onboard multiband frequency-conversion on the strength of microwave photonics and, a proof-of-concept experiment is demonstrated in which a Ka-band signal is converted to other satellite frequency bands. The experimental results reveal our system feasibility, and the bit error rate of recovered baseband data is less than 10–9. Moreover, the optical frequency combs can be recon?gured by adjusting the parameters of the local oscillator and optical modulator.
关键词： multi-band frequency conversion,Microwave photonics,recon?gurable satellite transponder.,optical frequency comb
更新于2025-09-10 09:29:36
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Research on bandgap property of a novel small size multi-band phononic crystal
摘要： A novel small size multi-band gaps phononic crystal (hPC) composed of the periodic plumbum and aluminum mass has been investigated in this paper, we calculated the dispersion relations and the displacement fields with finite element method (FEM). The influences of the geometrical parameters and materials parameters on the band structure are further investigated. We studied the influence factors of band gap by the model of origin anti-resonance. There are many flat bands in the characteristic frequency curve. The band gap covers a large range in low frequency.
关键词： Local resonance,Bragg scattering,Multi-band gaps,Origin anti-resonance
更新于2025-09-10 09:29:36
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A Simple Multi-band Metamaterial Absorber with Combined Polarization Sensitive and Polarization Insensitive Characteristics for Terahertz Applications
摘要： This paper presents a simple multi-band metamaterial absorber for terahertz applications. The unit cell of the proposed structure consists of a single square ring having gaps at the centers on three of its sides. The proposed absorber produces three absorption bands for all polarizations and hence the design can be considered as insensitive to polarization variation. It provides an average absorption of 96.92% for the TE polarization with a peak absorption of 99.44% at 3.87 THz and for the TM polarization, it provides an average absorption of 98.4% with a peak absorption of 99.86% at 3.87 THz. An additional absorption peak is observed for the TE polarization at 1.055 THz that gradually diminishes with the increase in polarization angle and completely vanishes for the TM polarization. Thus, the structure displays a hybrid polarization response with polarization insensitivity in three bands and polarization sensitivity in one band. Parametric analysis has been carried out validating the optimal selection of the design parameters. The simplicity of the design and its combined polarization sensitive and polarization insensitive absorption characteristics can find tremendous applications in the field of terahertz imaging and sensing.
关键词： Metamaterial,Plasma frequency,Terahertz absorber,Multi-band absorber
更新于2025-09-10 09:29:36
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PHASE ENHANCEMENT FOR MULTI-RESONANCE COMPACT METAMATERIAL ANTENNAS
摘要： In this paper, a nonlinear phase enhancement of multi-resonance composite right/left-handed unit cell for multi-band antennas is presented. Di?erent antennas with nonlinear enhanced phase which can operate up to ?ve di?erent frequency bands are introduced. Meanwhile, the proposed antennas have compact size so that they can demonstrate size reduction up to 60% compared to conventional patch antennas operating at the same frequencies. The achieved phase enhancement has been validated by comparing two di?erent con?gurations of composite right/left-handed cells. The analysis, electromagnetic full wave simulations and experimental results are discussed. A reasonable agreement is achieved between the measured and simulated results.
关键词： compact metamaterial antennas,phase enhancement,composite right/left-handed (CRLH),multi-resonance,multi-band
更新于2025-09-09 09:28:46
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Triple-Band Dual-Sense Circularly Polarized Hybrid Dielectric Resonator Antenna
摘要： In this paper, a triple-band dual-sense circularly polarized (CP) hybrid dielectric resonator antenna is proposed. A modified hexagonal dielectric resonator (DR) is top-loaded with a square microstrip ring (SMR). A vertical-tapered-strip connected to a 50-? microstrip line is used to excite the proposed antenna. It is found that the lower and central CP bands correspond to left-handed circular polarization and are produced by the TM11 and TE111 modes of the SMR and modified hexagonal DR, respectively. The upper CP band is formed by the combination of the quasi-TM21 mode of the SMR and quasi-TE111 mode of the DR that exhibits right-handed circular polarization. The measurement results of the fabricated prototype show triple-band response for |S11| < ?10 dB with impedance bandwidths (IBWs) of 17.4% (1.75–2.03 GHz), 28.13% (2.23–2.96 GHz), and 2.97% (3.65–3.76 GHz) in the lower, central, and upper bands, respectively. The measured 3 dB axial ratio bandwidths lying within ?10 dB IBWs are 3.69% (1.86–1.93 GHz), 5.46% (2.67–2.82 GHz), and 2.15% (3.68–3.76 GHz) along with the peak gains of 5 dBic, 5.28 dBic, and 2.36 dBic in the lower, central, and upper bands, respectively.
关键词： hybrid antenna,dielectric resonator antenna (DRA),square microstrip ring,multi-band,triple-band circular polarization
更新于2025-09-09 09:28:46
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A Polarization-Dependent Frequency-Selective Metamaterial Absorber with Multiple Absorption Peaks
摘要： A polarization-dependent, frequency-selective metamaterial (MM) absorber based on a single-layer patterned resonant structure intended for F frequency band is proposed. The design, fabrication, and measurement for the proposed absorber are presented. The absorber’s absorption properties at resonant frequencies have unique characteristics of a single-band, dual-band, or triple-band absorption for different polarization of the incident wave. The calculated surface current distributions and power loss distribution provide further understanding of physical mechanism of resonance absorption. Moreover, a high absorption for a wide range of TE-polarized oblique incidence was achieved. Hence, the MM structure realized on a highly flexible polyimide film, making the absorber suitable for conformal geometry applications. The proposed absorber has great potential in the development of polarization detectors and polarizers.
关键词： metamaterial,absorber,multi-band absorption,polarization-dependent
更新于2025-09-09 09:28:46
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[IEEE 2018 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC) - Xuzhou (2018.7.21-2018.7.24)] 2018 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC) - A New Design for Spoof Surface Plasmon Polaritons Using Periodic Holes Etched on the Stripline
摘要： In this paper, a symmetrical ultrathin spoof surface plasmon polaritons (SSPPs) is realized based on the traditional coplanar waveguide (CPW), which can achieve multi-band high-efficiency transmission by employing the periodic holes etched on the middle stripline. Physical mechanism of the proposed SSPPs is explained by using the dispersion curves and electric field distributions. The measured results have a good agreement with the simulated ones, which indicate that the proposed SSPPs will be potentially very useful for microwave applications.
关键词： multi-band,spoof surface plasmon polaritons,high-efficiency transmission
更新于2025-09-09 09:28:46