Discrete event simulation has benefited from statistical analysis but the reverse is not true. Recent advances in computer technology and software development have made it possible to have PC's running specialized simulation languages readily available. The paper discusses how discrete event simulation, developed via specialized simulation languages (e.g.,… (More)
Prefractal Hilbert curves are analyzed in terms of radiation efficiency, quality factor, and electrical size for their use as small self-resonant monopole antennas. The structures show better performance as loads of monopoles than as radiating structures.
—Preliminary results of a time domain reflection approach for the non-destructive testing of Steel Fiber Reinforced Concrete (SFRC) are presented in this paper. An open-ended epoxy-filled waveguide and a reflector plate located behind the material sample are used to measure its effective permittivity. An electromagnetic model based on the Maxwell-Garnett… (More)
– One of the main concerns when imaging extended real objects is the capacity of the system to correctly reconstruct the object cross section electric properties. In this paper, the imaging capabilities of an UWB short range system are analyzed, based on the Multifrequency Bi-Focusing Imaging (MFBF) and Time Difference of Arrival (TDOA) techniques, and its… (More)
– In this paper, two different methods for object imaging and location in 2 and 3 dimensional environments using a UWB sensor network are presented and compared: an imaging technique using a bifocusing operator and a location technique based on the time of arrival. The " interrogation " geometry consists of several antennas for transmitting and receiving… (More)
1879 Fig. 7. Simulated (solid line) and measured (dashed line) radiation pattern at 985 MHz for the TM Mode of the designed antenna. modes are very well matched. If we compare the experimental values with the calculated ones we can see a shift towards the higher frequencies in the measured ones. This can be due to the fact that the cavity model is a… (More)
Ten years ago, the first Spanish high speed line which traveled from Madrid to Sevilla at an average speed of 250 km/h was inaugurated. At this speed pantograph noise, which is of an aerodynamic nature, is thought to have rather influence in the passengers zone. However, pantograph contribution is often omitted since main noise sources are expected to come… (More)
Analysis of highly iterated fractal antennas using integral equation methods is addressed in this paper. Time and memory requirements are greatly reduced taking advantage of the recursive structure of the fractal geometry.