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Tunable graphene-based mid-infrared band-pass planar filter and its application

Chinese Physics B 2018年第8期27卷 290-296页

作者： Somayyeh Asgari Hossein Rajabloo Nosrat Granpayeh homayoon oraizi Center of Excellence in Electromagnetics Optical Communication Laboratory Faculty of Electrical EngineeringK N Toosi University of Technology Young Researchers and Elite Club Azadshahr Branch Islamic Azad University Department of Electrical Engineering Iran University of Science and Technology

We have designed and proposed the edge modes supported by graphene ribbons and the planar band-pass filter consist- ing of graphene ribbons coupled to a graphene ring resonator by using the finite-difference time-domain numerical method. Simulation results show that the edge modes improve the electromagnetic coupling between devices. This structure works as a novel, tunable mid-infrared band-pass filter. Our studies will benefit the fabrication of planar, ultra-compact nano-scale devices in the mid-infrared region. A power splitter consisting of two output ribbons that is useful in photonic integrated devices and circuits is also designed and simulated. These devices are useful for designing ultra-compact planar devices in photonic integrated circuits.

关键词： band-pass filter graphene surface plasmons power splitter

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Improvement of Antenna Radiation Efficiency by the Suppression of Surface Waves

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Journal of Electromagnetic Analysis and Applications 2011年第3期3卷 79-83页

作者： homayoon oraizi Bahram Rezaei 不详

The characteristics of coplanar waveguide (CPW) fed ring antennas (such as gain, efficiency and polarization purity) are degraded by the dielectric losses and excitation of surface waves on the substrates. To counteract such effects, we propose to remove some portions of the substrate in the vicinity of the metallic patches, which effectively eliminates the conditions for the generation of surface waves. The proposed technique is applied to a CPW-fed ring antenna and a prototype model is fabricated. The measurement data and the computer simulation results agree well and indicate the efficacy of the technique for the improvement of antenna gain and efficiency.

关键词： CPW-fed Ring Antenna Surface Waves Radiation Efficiency

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