期刊
SENSORS
卷 18, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/s18103506
关键词
electromagnetic absorber; frequency reconfigurable absorber; thermally reconfigurable; phase changing material
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2017R1D1A1B03029995]
- Chung-Ang University Research Scholardhip Grants in 2015
- National Research Foundation of Korea [22A20152013024, 2017R1D1A1B03029995] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, we propose a thermal frequency reconfigurable electromagnetic absorber using germanium telluride (GeTe) phase change material. Thermally-induced phase transition of GeTe from an amorphous high-resistive state to a crystalline low-resistive state by heating is used to change the resonant frequency of the absorber. For full-wave simulation, the electromagnetic properties of GeTe at 25 degrees C and 250 degrees C are characterized at 10 GHz under normal incidence for electromagnetic waves. The proposed absorber is designed based on the characterized electromagnetic parameters of GeTe. A circular unit cell is designed and GeTe is placed at a gap in the circle to maximize the switching range. The performance of the proposed electromagnetic absorber is numerically and experimentally demonstrated. Measurement results indicate that the absorption frequency changes from 10.23 GHz to 9.6 GHz when the GeTe film is altered from an amorphous state at room temperature to a crystalline state by heating the sample to 250 degrees C. The absorptivity in these states is determined to be 91% and 92%, respectively.
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