Design and Free-Space Measurements of Broadband, Low-Loss Negative-Permeability and Negative-Index Media

作者：Rudolph Scott Michael^*; Pfeiffer Carl; Grbic Anthony

来源：IEEE Transactions on Antennas and Propagation, 2011, 59(8): 2989-2997.

DOI：10.1109/TAP.2011.2158948

• Metamaterials
• negative index of refraction
• negative permeability
• periodic structures
• super resolution

We present the design and measurement of broad-band, volumetric negative-permeability and negative-refractive-index (NRI) media. Both of these media are fabricated using standard printed-circuit-board techniques and operate at X-band frequencies. The S-parameters of four-cell slabs of the negative-permeability and NRI media are measured, and the material parameters of the NRI lens are extracted. The four-cell-thick (lambda(0)/3) NRI lens exhibits a backward-wave bandwidth of 41.2% and a total loss of 0.67 dB at the operating frequency (where mu(r) approximate to -1). Super-resolved focusing in free space is also demonstrated, and spatial frequencies beyond the free-space wavenumber are recovered over a bandwidth of 7.4%. A focus with a half-power beamwidth of 0.27 lambda(0) is achieved at 10.435 GHz.

• 出版日期2011-8