This work presents the experimental demonstration of lossy mode resonance generation by means of aluminum doped zinc oxide thin-films. The use of such material may allow to optimize the performance of LMR-based sensors, obtaining good sensitivity at lower costs than other overlays, such as those including indium. The refractometric response of the fabricated devices is explored in different spectral regions. One refractometer working in the near infrared region was fabricated, obtaining a sensitivity of 2,280 nm/RIU. A second refractometer working in the visible light spectrum was also fabricated. This second device allows to observe rough refractive index variations with the naked eye as a change of the color of the light propagating through the fiber, simplifying the setup needed for its use.
This paper deals with the design of non-uniform circular phased arrays for maximum side lobe level reduction during scanning. We present a pattern synthesis method of non-uniform circular antenna arrays for simultaneous reduction of the side lobe level and pattern distortion over different scanning ranges. The method of genetic algorithms is used to determine an optimum a set of weights and antenna element separations that provide a radiation pattern with maximum side lobe level reduction over different scanning ranges. Simulation results show that design of non-uniform circular antenna arrays using the method of genetic algorithms provides a considerable side lobe level reduction although the beam direction is steered over wide scanning ranges.Index Terms.-Non-uniform circular phased arrays, genetic algorithms, side lobe level, main beam width, radiation pattern.
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