Frequency tunable electromagnetic metamaterial using ferroelectric loaded split rings

Measurements of a frequency tunable magnetic metamaterial using metallic split rings loaded with barium strontium titanate thin film capacitors are presented. The resonant frequency of this medium is voltage tunable across a 140MHz band centered at 1.75GHz. S-parameter measurements in a microstrip waveguide reveal that the effective relative permeability of the slab has a roughly Lorentzian shape that reaches minimum values between −2 and −3 for biases from 0to5V. The permeability of the slab can tune between positive and negative values, making it useful in applications requiring a state switchable magnetic permeability.

[1]  David R. Smith,et al.  Modulating and tuning the response of metamaterials at the unit cell level. , 2007, Optics express.

[2]  Adnan Sondas,et al.  Dual-Polarized Frequency-Tunable Composite Left-Handed Slab , 2005 .

[3]  I. Gil,et al.  Tunable metamaterial transmission lines based on varactor-loaded split-ring resonators , 2006, IEEE Transactions on Microwave Theory and Techniques.

[4]  J. Chu,et al.  Electrical characterization of subbands in the HgCdTe surface layer , 1997 .

[5]  B. Chiou,et al.  Dielectric tunability of barium strontium titanate/silicone-rubber composite , 1998 .

[6]  Generalized nonextensive thermodynamics applied to the cosmic background radiation in a Robertson-Walker universe. , 1996, Physical review letters.

[7]  Xiao Liang,et al.  Electrically tunable negative permeability metamaterials based on nematic liquid crystals , 2007 .

[8]  V. Veselago.  The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ , 1968 .

[9]  F. J. Rachford,et al.  Tunable negative index metamaterial using yttrium iron garnet , 2007 .

[10]  Y. Kivshar,et al.  Tunable split-ring resonators for nonlinear negative-index metamaterials. , 2006, Optics express.

[11]  D. Smith,et al.  Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients , 2001, physics/0111203.

[12]  D. Sievenpiper,et al.  High-impedance electromagnetic surfaces with a forbidden frequency band , 1999 .

[13]  J. G. Solé,et al.  Continuous-wave laser oscillation at 929nm from a Nd3+-doped LiNbO3:ZnO nonlinear laser crystal: A powerful tool for blue laser light generation , 2004 .