J.A. Pontes

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This paper introduces a relative structural complexity measure for the characterization of disordered surfaces. Numerical solutions of 2d+1 KPZ equation and scanning force microscopy (SFM) patterns of porous silicon samples are analyzed using this methodology. The results and phenomenological interpretation indicate that the proposed measure is efficient(More)
A mobile phone equipped with a multiple antenna system is investigated with respect to its human exposure to electromagnetic fields. The channel conditions and the demanded capacity determine the required exictation voltages, which are passed to a commercial software tool. To get rid of the influence of various antenna distances to the shaped human head a(More)
Dielectric resonator antennas (DRA) are mostly investigated for frequencies above approx. 5 GHz, but in this paper they are suggested for use in the mobile communication standard UMTS (1.92 -2.17 GHz) base stations, because they can provide a denser aperture since they can be drastically reduced in size through proper selection of the materials dielectric(More)
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