We have measured the microwave transmission between 12 and 18 GHz through wire arrays formed into two
dimensional square lattices. One array made of copper wire 0.14 mm in radius consisted of five rows by
21 columns having a lattice constant of 5.2 mm. This array exhibited a pass band above 15 GHz, in good
agreement with the calculated plasma frequency found from an expression for the permittivity derived in the
long wavelength limit. A second array was made with Nichrome wire of radius 18 μm and lattice constant
1.1 mm. This array was filled with dielectric loaded with powdered magnetite. A sample of this metamaterial
5.8 mm thick and with no externally applied magnetic field exhibited a pass band above 17 GHz. Implications
for creating metamaterials with a negative index of refraction from wire arrays embedded in a magnetic host
are discussed.
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