Tunable Metamaterial Absorber Using Ferromagnetic Resonance
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Tunable Metamaterial Absorber Using Ferromagnetic Resonance Yunju La,∗ Ok Sung Jeon, Young Jun Lee, Sang Yoon Park† and Young Joon Yoo‡ Advanced Institutes of Convergence Technology, Seoul National University, Suwon 16229, Korea
Taekyung Lim∗ Department of Physics, Kyonggi University, Suwon 16227, Korea
KeunHyeok Yang Department of Architectural Engineering, Kyonggi University, Suwon 16227, Korea (Received 29 September 2020; revised 20 October 2020; accepted 20 October 2020) We simulated a study on a tunable metamaterial absorber using ferrite rubber as a dielectric substrate with ferromagnetic properties. The proposed structure employs ferromagnetic resonance, which utilizes the coupling of an applied magnetic field and an incident electromagnetic wave. As the magnitude of the applied magnetic field increases, it can be seen that the absorption peak moves to a higher frequency. The adjustment of the absorption frequency using the proposed method is expected to be applied to various fields such as sensors, electronic devices and 5G communication antennas. Keywords: Metamaterial, Absorber, Tunable DOI: 10.3938/jkps.77.1012
I. INTRODUCTION Humans can obtain energy from electromagnetic waves, including light, can analyze materials using electromagnetic waves, and exchange information using electromagnetic waves. The electromagnetic waves in the MHz band are used for radio communication, the several GHz is the frequency of the mobile phone, and the several ∼100 GHz band is used as a military or industrial frequency. The infrared band can be used for night vision and IR analysis. The visible light band, including ultraviolet light, enables humans to recognize objects as well as the atomic energy of matter. X-rays and gamma rays can be harmful to the human body, but they can be used for structural analysis and nuclear medicine diagnostic purposes. As mentioned above, electromagnetic waves including light have an advantage that humans can use them according to their purpose. For these reasons, humans have tried to control electromagnetic waves using various methods. For example, using optical filters, color shifting materials, and periodic arrangements, electromagnetic waves were variously controlled through absorption, transmission, speed control, diffraction, and spectroscopy. Metamaterials are being tried in various ways by many ∗ These
authors contributed equally to this work. [email protected] ‡ E-mail: [email protected] † E-mail:
pISSN:0374-4884/eISSN:1976-8524
researchers because of the interesting advantage of controlling electromagnetic waves through periodic structural design [1–5]. Metamaterials can control electromagnetic waves due to the artificially designed metal pattern and periodicity of the dielectric. Recently, metamaterials, based on structures composed only dielectrics and only metals, have been introduced [6–9]. Typical applications of metamaterials include super lenses [10], stealth [11], array antennas [12], and absorbing materials [13]. The first metamaterial electromagnetic wave absorbers we
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