Abstract-Magnetic properties were imparted to a naturally nonmagnetic material by metallic inclusions. A patch antenna tested the performance of the magnetic metamaterial as a substrate and validated that a single substrate can achieve a range of miniaturization values. The effective medium metamaterial substrate employed electromagnetically small embedded circuits (ECs) to achieve permeability and permittivity greater than that of the host dielectric. Geometric control of the ECs allowed and to be tailored to the application. The magnetic metamaterial exhibited enhanced and with acceptable loss-factor levels. Models for predicting and are presented, the benefits of employing metamaterial substrates are discussed, and the results in this antenna experiment are presented. The metamaterial exhibits performance characteristics not achievable from natural materials. Of particular significance is that with the permeability varying strongly and predictably with frequency, the miniaturization factor may be selected by tuning the operating frequency.
Magnetic permeability was imparted to a naturally non-magnetic material by metallic inclusions. A patch antenna tested the performance of the magnetic metamaterial as a substrate. The magnetic metamaterial exhibited enhanced )r and E as predicted with acceptable loss-factor levels. Models for predicting p and E are presented and simulations indicate that permeability can be extended well beyond several gigahem with cumnt technology. Permeability in the fi, = 1-4 range is achievable for moderately low-loss applications. Representative antenna miniaturization factor=-6.4 with efficiency=21-35%
Metamaterial EM insulators are designed to eliminate mutual coupling between closely packed array elements. This technique allows for array element design in isolation, without consideration of mutual coupling effects. Eliminating mutual coupling also allows for denser packing and higher directivity in antenna arrays. By placing Isolation Walls along the radiating edges of a patch on a 4I3x4'3 groundplane a 19.2dB front-toback ratio is achieved. Metamaterial Isolation walls 0.05A4 thick exhibit -10 dB isolation bandwidths of 2-6% with very low losses for various geometries and greater than 20 dB peak isolation is achieved for array element spacing of 0.24a.
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