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We present an artificial dielectric gradient index lens designed to operate at millimeter-wave frequencies. Finite element simulations are used in conjunction with material parameter retrieval techniques to design an artificial dielectric unit cell with an optimum refractive index range. This refractive index range is then used with ray-tracing software to arrive at an optimized index profile. A lens...
We have demonstrated that effective gradient index devices can be fabricated to collimate and steer microwave beams by designing the spatial profile of positive effective permittivity across the slab. Resonant losses in the devices is reduced dramatically by operating at frequency ranges far from the unit cell resonance, and substrate losses is reduced by utilizing low loss material. Using these approaches,...
Microwave propagation through an electric-field-coupled metamaterial lens with a refractive index gradient is experimentally investigated. A gradient in the refractive index of the metamaterial is introduced by continuous tuning of a single parameter in the metamaterial elements. Experimental field maps, acquired in a planar waveguide, demonstrate that the planar gradient index lens can be used to...
In this paper, topology design optimization for electromagnetic materials, a left- handed leaky wave antenna for millimeter-wave applications, and left-handed dipole antennas have been presented along with some thoughts for future investigation. All have been the subject of recent metamaterial studies at TCRL and TEMA. Metamaterials will clearly open up a whole new field for automotive electronics...
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