Abstract
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.
Highlights
Since Veselago’s theoretical study of negative index media1 and the study of Pendry et al of wire structures2 and split ring resonatorsSRRs,3 artificial electromagnetic materials have been developed that exhibit unique characteristics
We demonstrate experimentally a multielement, frequency tunable magnetic metamaterial composed of SRRs loaded with voltage tunable BST thin film capacitors
Several unit cells were created using 8 m2 BST thin films50/ 50 BST: stoichiometry Ba0.5Sr0.5TiO3͒, part of a capacitor die provided by the Gennum Corporation
Summary
Since Veselago’s theoretical study of negative index media1 and the study of Pendry et al of wire structures2 and split ring resonatorsSRRs,3 artificial electromagnetic materials have been developed that exhibit unique characteristics. Frequency tunable electromagnetic metamaterial using ferroelectric loaded split rings Thomas H. We demonstrate experimentally a multielement, frequency tunable magnetic metamaterial composed of SRRs loaded with voltage tunable BST thin film capacitors.
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