Tunable negative index metamaterial using yttrium iron garnet |
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| Authors: | Yongxue He Peng He Soack Dae Yoon P.V. Parimi F.J. Rachford V.G. Harris C. Vittoria |
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| Affiliation: | 1. Center for Microwave Magnetic Materials and Integrated Circuits, Northeastern University, Boston, MA 02115, USA;2. Department of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115, USA;3. Physics Department, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA;4. Code 6362, Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375, USA |
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| Abstract: | ![]()
A magnetic field tunable, broadband, low-loss, negative refractive index metamaterial is fabricated using yttrium iron garnet (YIG) and a periodic array of copper wires. The tunability is demonstrated from 18 to 23 GHz under an applied magnetic field with a figure of merit of 4.2 GHz/kOe. The tuning bandwidth is measured to be 5 GHz compared to 0.9 GHz for fixed field. We measure a minimum insertion loss of 4 dB (or 5.7 dB/cm) at 22.3 GHz. The measured negative refractive index bandwidth is 0.9 GHz compared to 0.5 GHz calculated by the transfer function matrix theory and 1 GHz calculated by finite element simulation. |
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| Keywords: | 42.25.Bs 41.20.Jb 73.20.Mf |
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