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ABSTRACT: In this paper we present the methodology and guidelines for the fabrication of wideband planar antenna arrays, for ISM band applications. The fabrication is carried-out by hand using off-the-shelf components, ensuring an extremely low-cost process and rapid prototyping. The methodology is addressed to radio amateurs, or less skilled individuals wishing to deploy WLAN networks in a quick and inexpensive manner.
Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on; 04/2009
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ABSTRACT: A single-channel alternative detection system for magnetic resonance imaging and spectroscopy experiments is presented. After the phase error identification, which is realized through a simple method, one can correct the reconstructed image and discriminate between positive and negative frequencies without any loss of the S/N ratio. Since there is only one channel, that is a real signal, it is possible to use the Hartley instead of the Fourier transform. The former is faster and requires less storage memory.
IEEE Transactions on Medical Imaging 02/1991; 10(4):638-41. · 3.64 Impact Factor
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ABSTRACT: The control of the thermal losses dissipated inside the human body during magnetic resonance imaging (MRI) is very important, since it is directly related to patient safety. The authors give the exact solution to the problem of the electromagnetic energy dissipation and distribution inside a conductive sphere and a finite conductive cylinder, considered as the closest models to the human anatomy. The high-frequency alternating magnetic field is produced by a current loop. Numerical results are given for alternating fields from 6 to 100 MHz and various excitation geometries. The results, which take into account the magnetic field inhomogeneities and the finite dimensions of the conductive models, apply not only to the MRI experiments but also to any similar eddy-current problem.
IEEE Transactions on Medical Imaging 02/1988; 7(4):381-5. · 3.64 Impact Factor
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ABSTRACT: This paper describes an efficient method for visualizing the simulated received power levels at a specified site in the form of equipower scatter plots. This approach provides an easy way for inspecting the actual radio-coverage limits of a mobile network, for a specified reception threshold. For an increased degree of accuracy to be achieved, a ray launching technique has been implemented for the propagation simulations. The representation is applicable to both indoor and outdoor applications.
Antennas and Propagation, 2003. (ICAP 2003). Twelfth International Conference on (Conf. Publ. No. 491);
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ABSTRACT: In this paper we present the results of a simulation we performed in order to examine DECT's behavior as far as its traffic capabilities are concerned. Therefore, we consider a network that uses the DECT radio access technology and try to simulate a realistic traffic scenario. We are trying to involve DECT's characteristics as those were defined by the DECT ETSI specification. The results show a satisfactory capacity behavior for indoor applications.
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ABSTRACT: In this paper we present some preliminary results on the subject of indoor wireless communications planning by using computer simulation of signal propagation. The goal of this simulation is to obtain an overview of the received signal strength throughout the indoor environment and then try to optimize the coverage by moving the antenna properly. The optimization is considered as a procedure of moving signal "blind spots" according to a non-standard pattern that obeys custom needs, related to specific parameters of the environment (e.g. furniture).
