Designing and analysis of multi-band microwave metamaterial absorber for sensing application

Yuyan Zhao; Yuhuang Liu; Wenhua Gu; Limin Ma

doi:10.1117/12.2692280

18 December 2023 Designing and analysis of multi-band microwave metamaterial absorber for sensing application

Yuyan Zhao, Yuhuang Liu, Wenhua Gu, Limin Ma

Proceedings Volume 12968, AOPC 2023: Optic Fiber Gyro ; 1296806 (2023) https://doi.org/10.1117/12.2692280
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

Here, a multi-band metamaterial absorber (MMA) is proposed. The MMA (multi-band metamaterial absorber) consists of a symmetrical snowflake resonator layer and an underlying metal plate, separated by a dielectric layer. Furthermore, the snowflake resonator is composed of several branches which leads to multiple resonant modes. The coupling of each resonant mode leads to an absorption enhancement effect. The structure is optimized to achieve perfect absorption at three resonant frequencies. Simulation results show that the MMA achieves three narrow absorption peaks with absorptivity of 94.6%, 98.95%, and 98.82% in the range of 15~36 GHz. The absorption mechanism is analyzed in detail at all three resonant frequencies, and the structure size and resonant frequency are calculated and matched quantitatively. By means of analog circuit, the absorption spectrum of the absorber is verified. In addition, the application of the proposed MMA as liquid sensor is realized by analyzing the frequency shift of the absorption peaks. The sensitivity of the refractive index sensor based on the proposed MMA is 11.64 GHz/RIU, the quality factor is 1236, and the figure of merit (FoM) is 151.33 RIU^-1 at one of the resonant frequencies, when the analyte thickness is 5.5mm and the refractive index range is 1 to 1.48.

Citation Download Citation

Yuyan Zhao, Yuhuang Liu, Wenhua Gu, and Limin Ma "Designing and analysis of multi-band microwave metamaterial absorber for sensing application", Proc. SPIE 12968, AOPC 2023: Optic Fiber Gyro , 1296806 (18 December 2023); https://doi.org/10.1117/12.2692280

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KEYWORDS

Refractive index

Absorption

Sensors

Dielectrics

Resonators

Magnetism

Microwave radiation

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