Tunable negative index metamaterial using yttrium iron garnet
نویسندگان
چکیده
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 23GHz under an applied magnetic field with a figure of merit of 4.2GHz/kOe. The tuning bandwidth is measured to be 5GHz compared to 0.9GHz for fixed field. We measure a minimum insertion loss of 4 dB (or 5.7 dB/cm) at 22.3GHz. The measured negative refractive index bandwidth is 0.9GHz compared to 0.5GHz calculated by the transfer function matrix theory and 1GHz calculated by finite element simulation. r 2007 Published by Elsevier B.V. PACS: 42.25.Bs; 41.20.Jb; 73.20.Mf
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