Thermal Frequency Reconfigurable Electromagnetic Absorber Using Phase Change Material
| Autor: | You-Hwan Moon, Jeong-Heum Park, Sungjoon Lim, Chang-Wook Baek, Heijun Jeong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Phase transition
Materials science frequency reconfigurable absorber 02 engineering and technology lcsh:Chemical technology Biochemistry Electromagnetic radiation Article Analytical Chemistry chemistry.chemical_compound Thermal 0202 electrical engineering electronic engineering information engineering lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation Germanium telluride phase changing material Range (particle radiation) electromagnetic absorber business.industry 020206 networking & telecommunications Molar absorptivity 021001 nanoscience & nanotechnology Phase-change material Atomic and Molecular Physics and Optics Amorphous solid chemistry thermally reconfigurable Optoelectronics 0210 nano-technology business |
| Zdroj: | Sensors Volume 18 Issue 10 Sensors, Vol 18, Iss 10, p 3506 (2018) Sensors (Basel, Switzerland) |
| ISSN: | 1424-8220 |
| DOI: | 10.3390/s18103506 |
| Popis: | 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 ° C and 250 ° 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 ° C. The absorptivity in these states is determined to be 91% and 92%, respectively. |
| Databáze: | OpenAIRE |
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