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Microstrip Line Impedance Matching Using ENZ Metamaterials, Design and Application
摘要： The idea of this paper is to extend the tunneling effect of epsilon-near-zero (ENZ) narrow channel for matching two microstrip lines with different impedance characteristics. The main advantage of this method is the possibility to design a channel with subwavelength electrical size and obtain similar matching condition when compared with a conventional λ/4-transformer. The bandwidth of the structure is directly related to the bandwidth of the ENZ-metamaterials (MTM). The suggested matching circuit is comprised of a metallic wall and an ENZ narrow channel. To realize the ENZ channel, a rectangular waveguide which operates in TE10 mode is designed and implemented using a substrate integrated waveguide (SIW) technology. A set of vias are also needed for emulating the metallic wall to reduce the ENZ channel cross section. The proposed structure for different impedance values of 50?, 100?, and 150? was designed, simulated, fabricated, and tested. Moreover, as an important application of a matching network, a microstrip patch antenna has been matched over the desired frequency band. Simulation results based on CST microwave studio have good agreement with measurements. It is shown that the bandwidth of the circuit is 8%–15%.
关键词： impedance matching,metamaterials (MTM),Epsilon-near-zero (ENZ),microstrip line,tunneling
更新于2025-09-23 15:22:29
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Tailoring absorption spectrum by inserting an epsilon-near-zero film into metal-dielectric-metal assembly
摘要： A method of tailoring the absorption band generated by metal-dielectric-metal (MDM) resonator is analytically proposed and numerically investigated in this paper. By inserting an epsilon-near-zero (ENZ) ?lm into the MDM layers, the absorption bandwidth can be su?ciently widened due to the coupling from ENZ mode to localized edge plasmon mode. Theoretical instructions of how to design respective layer thickness to obtain optimized absorption rate are investigated with the guidance of vast simulations and the hybrid resonance characteristics by the coupling from ENZ mode are further inspected by monitoring the resonant electric and magnetic ?eld. The meta-absorber can achieve high absorption with a large bandwidth under oblique incidence. The method and the structure proposed in this paper have potential views in highly integrated nanostructures in solar cells, photovoltaic and sensing application ?elds.
关键词： Epsilon-near-zero (ENZ),Absorber,Metamaterial
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Slow light at the nanoscale based on active epsilon-near-zero plasmonic waveguides
摘要： Plasmonic waveguides exhibit an effective epsilon-near-zero (ENZ) response at their cut-off frequency. In this work, we demonstrate the formation of an exceptional point (EP) in a nanoscale open and lossy (non-Hermitian) nanophotonic system consisting of an array of periodic nanowaveguides loaded with a very low gain coefficient material. We theoretically analyze the obtained EP, as well as its topological properties, by using a transmission-line model adapted to the plasmonic properties of the proposed device. The dispersion of the active ENZ mode and the group velocity are thoroughly investigated. Reflectionless transmission (perfect loss compensation) and ultraslow group velocity values at the nanoscale are realized at the EP, which coincides with the ENZ cut-off frequency of the proposed plasmonic system. This special spectral degeneracy (EP) is a unique feature of the presented nanoscale symmetric plasmonic ENZ configuration, different from most of the previous works that were mainly focused on asymmetric bulky micron-scale active photonic configurations.
关键词： Plasmonic waveguides,epsilon-near-zero (ENZ),non-Hermitian,exceptional point (EP),group velocity,nanophotonic system
更新于2025-09-16 10:30:52