volume | PIER Journals

Abstract

This article addresses the challenges associated with poor tunability and the single absorption function in absorbers. To address these challenges, we designed a dual-band switchable tunable absorber utilizing graphene and vanadium dioxide.The proposed absorber exploits the phase transition characteristics of vanadium dioxide to achieve absorption in the low-frequency band when it is in the dielectric state and absorption switching in the high-frequency band after phase transition. Furthermore, the Fermi level is altered by applying a bias voltage to the graphene, resulting in reduced square resistance. This mechanism allows tuning of the absorption frequency when the vanadium dioxide is in the dielectric state and adjustment of the absorption bandwidth when it is in the metallic state. Simulation results reveal that when the vanadium dioxide is in the dielectric state, the absorption rate exceeds 90% within the 20.0-27.7 GHz range. At this time, increasing the Fermi level of the graphene alters the absorption frequencies to 11 GHz and 42 GHz, respectively. Conversely, when the vanadium dioxide is in the metallic state, the absorption rate exceeds 90% within the 31.1-48.7 GHz range. Thus, elevating the Fermi level of the graphene leads to absorption band tuning at higher frequencies. This absorber demonstrates strong tunability and multifunctional absorption capabilities, offering outstanding practical application value.

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Professor Baojun Chen

Dr. Tianyu Jiao

Dr. Mengqiu Qian

Professor Yanjie Ju

Prof. Yanbing Xue