A magnetically tunable double negative material is experimentally synthesized by incorporating PMWA (periodic metallic wire array) with negative effective permittivity into YIG (yttrium iron garnet) applied by external magnetic field with negative effective permeability. The experimental results show that electromagnetic (EM) wave can pass through the composite medium when the effective permittivity of the PMWA and the effective permeability of YIG substrate are negative simultaneously. Under an applied external magnetic field changed from 1900 to 2800Oe, the double negative transmission pass band center of the composite media is tuned from 7.5GHz to 9.8GHz accordingly.
Key words: Periodic metallic wire array, yttrium iron garnet, tunable, double negative material.
PMWA, Periodic metallic wire array; DNM, double negative material; EM,electromagnetic; LHM, left-handed material; SRRs, split ring resonators; YIG, yttrium iron garnet; PPW, parallel plate waveguide; HFSS, high frequency structure simulator.
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